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Bench-scale testing of the micronized magnetite process. Fifth quarterly technical progress report, July 1995--September 1995

Description: The major focus of the project, which is scheduled to occur through January 1996, will be to install and test a 500{number_sign}/hr. fine coal-cleaning circuit at DOE`s Process Research Facility (PRF), located at the Pittsburgh Energy Technology Center (PETC). The circuit will utilize an extremely fine, micron-sized magnetite media and small diameter cyclones to make efficient density separations on minus-28-Mesh coal. The main accomplishments of Custom Coals and the project subcontractors, during this period, included: continued purchasing small equipment and supplies for the circuit; procured a 46-ton sample of Lower Kittanning ``B`` Seam coal; completed eight primary integrated tests (PIT {number_sign}1--{number_sign}8) using the Pittsburgh No. 8 seam and the Grade-K and Grade-L magnetites; completed classifying cyclone tests using the Pittsburgh No. 8 and Lower Kittanning seams using a larger (0.5 inch) apex; completed data analysis on the four Grade-K magnetite ``closed-loop`` heavy-media cyclone tests; obtained a finer third grade of magnetite (Grade-M) with a MVD of approximately 3 microns; presented paper on the Micro- Mag project at the Coal Preparation, Utilization and Environmental Control Contractors Conference and a Poster Board Paper on the Micro- Mag Project at the Pittsburgh Coal Conference; and developed a method to modify all 5 Micro-Mag magnetic separators to approximately one third of their present size to better approximate commercial operation.
Date: October 11, 1995
Partner: UNT Libraries Government Documents Department

Evaluation, engineering and development of advanced cyclone processes. Quarterly progress report, July 30, 1995--September 30, 1995

Description: The project goal is to develop an advanced coal beneficiation technology that can achieve high recovery of the parent coal`s calorific value, while maximizing pyritic sulfur removal. Coal cleaning is to be accomplished by physical means incorporating an advanced gravimetric process. Evaluation of different media types and their attendant systems for recovery, concentration and regeneration is to be completed. Phase I, media evaluation, now completed, involved a paper study and a number of laboratory tests to eliminate all but the best media options. Phase II, media testing, involved detailed testing of the more promising media and separators in a closed-loop pilot facility. In the final phase, phase III, the optimum medium, separator, and medium recovery system(s) will be tested with commercial-size equipment. The ceramic capillary action filter was plumed and connected to power. Process chutes, sumps, piping and motors were installed and connected. Plain water was circulated through the system. Sumps were sandblasted, primed and painted with urethane paint.
Date: December 31, 1995
Partner: UNT Libraries Government Documents Department

Bench-scale testing of the multi-gravity separator in combination with microcel. Final report

Description: It was the purpose of this investigation to test a new fine coal cleaning system, in which a coal is cleaned first by column flotation to remove primarily ash-forming minerals and then by an enhanced gravity separation technique to remove the pyrite remaining in the flotation product. Of the various column flotation technologies developed under the auspices of the US Department of Energy, the Microcel{sup TM} flotation column was chosen because it is being used commercially in the US coal industry, particularly by low-sulfur coal producers. Of the various enhanced gravity separation technologies used in minerals industry, Multi-Gravity Separator (MGS) was chosen because it shows promise for pyrite rejection from fine coal streams containing a wide range of particle sizes. The bench-scale tests were conducted using three different circuit configurations, i.e.; Microcel{sup TM} column alone; MGS alone; and Microcel{sup Tm} and MGS in series. In general, high ash-rejections were achieved using Microcel{sup TM} column and an MGS unit in series, both the ash and pyritic sulfur rejections exceeded what can be achieved using either the Microcel{sup TM} column or the MGS unit alone, demonstrating a synergistic effect.
Date: March 1, 1995
Creator: Luttrell, G.H.; Venkatraman, P.; Phillips, D.I. & Yoon, Roe-Hoan
Partner: UNT Libraries Government Documents Department

Bench-scale testing of the micronized magnetite process. Third quarterly technical progress report, January 1995--March 1995

Description: The major focus of the project, which is scheduled to occur through December 1995, will be to install and test a 500{number_sign}/hr. fine-coal cleaning circuit at DOE`s Process Research Facility (PRF), located at the Pittsburgh Energy Technology Center (PETC). The circuit will utilize an extremely fine, micron-sized magnetite media and small diameter cyclones to make efficient density separations on minus-28-Mesh coal. The overall objectives of the project are to: Determine the effects of operating time on the characteristics of the recirculating medium in a continuous integrated processing circuit, and subsequently, the sensitivity of cyclone separation performance to the quality of the recirculating medium; and determine the technical and economic feasibility of various unit operations and systems in optimizing the separation and recovery of the micronized magnetite from the coal products. This report contains a short discussion of the project description, objectives, budget, schedule, and teaming arrangement. The final section contains an outline of the specific project goals for the next quarterly reporting period.
Date: April 29, 1995
Partner: UNT Libraries Government Documents Department

Bench-scale testing of the Multi-Gravity Separator in combination with Microcel. Fifth quarterly report, October 1, 1993--December 31, 1993

Description: During the quarter ending December, 31, 1993, the independent, combined and long duration testing were completed for both the Pittsburgh No. 8 coal and the Illinois No. 6 coal. Overall, the project is on schedule and the bulk of the critical work, from a timing perspective, is complete. Table 1 summarizes the status of major project tasks as of December 31, 1993. Preliminary results provide strong evidence that combining the Microcel flotation column with the Multi-Gravity Separator has a synergistic effect. Overall ash and pyritic sulfur rejections of 75 %, at a 90 % combustible recovery, were consistently achieved on the Pittsburgh No.8 seam coal. On the Illinois No. 6 coal, pyritic sulfur rejections over 75 % and combustible recoveries of over 85 % were achieved. These results are discussed in this report. Although further analysis is taking place, it is very evident from the results presented herein that a well-designed and -operated flotation column performs well for ash rejection but not as well for pyrite rejection. It is equally evident that a good fine gravity separator can reject pyrite from coal but perform more poorly for ash rejection. The concept of combining the best of both units into one circuit has therefore been successfully tested in this project.
Date: January 1, 1994
Partner: UNT Libraries Government Documents Department

Evaluation, engineering and development of advanced cyclone processes. Quarterly technical progress report No. 14, January 1994--March 31, 1994

Description: The project goal is to develop an advanced coal beneficiation technology that can achieve high recovery of the parent coal`s calorific value, while maximizing pyritic sulfur removal. Coal cleaning is to be accomplished by physical means incorporating an advanced form of cycloning or gravimetric process. Evaluation of different media types and their attendant systems for recovery, concentration, and regeneration is to be completed. Phase 1, Media Evaluation, now completed, involved a paper study and a number of laboratory tests to eliminate all but the best media options. Phase 2, Media Testing, involved detailed testing of the more promising media and separators in a closed-loop pilot facility. In the final phase, Phase 3, it is proposed to test individual components of the process using the optimum medium, separator, and medium recovery system(s) selected in the prior phases. Major activities during this reporting period are as follows: Hot water wash experiments were performed in the laboratory with filter leaf tests to determine whether hot water would recover significantly greater amounts of calcium nitrate than previously obtained and thereby lower process costs. No significant improvement in recovery of calcium nitrate was found, but there was some questions concerning the results. Triple S Corporation has fabricated and delivered the structural steel for the Bench Scale Circuit (BSC). Steel remaining to be delivered includes the platework, chutes, sumps and tanks. While BSC construction is no longer planned, approximately half of the steel can be used to construct a test stand for the planned Component Test program.
Date: December 31, 1994
Partner: UNT Libraries Government Documents Department

Precombustion removal of hazardous air pollutant precursors. Third quarterly technical progress report, April 1, 1996--June 30, 1996

Description: This project involves the development of an optimized, bench-scale processing circuit capable of efficiently removing trace elements from run-of-mine coals. The optimized circuit will be developed using characterization data obtained from detailed washability studies and release analyses tests conducted with several eastern US coals. The optimized circuit will incorporate a variety of conventional and advanced coal cleaning processes which are believed to be the most cost-effective and commercially viable. The coal products from the optimized circuit will be further treated with complexing agents specifically designed to extract organometallic trace elements that are difficult to remove by physical cleaning operations. Finally, innovative bioremediation schemes will be investigated as a means of controlling the release of trace elements from the process waste streams. Emphasis has been placed on the development of a processing circuit which maximizes the rejection of trace elements, minimizes the production of coal fines which are costly to process and less marketable, and minimizes the downstream impacts of the process waste streams on the environment. During the past quarter, the project work plan and all associated technical/management reports were successfully approved. Activities associated with the selection and acquisition of all three base coal samples have also been completed. Characterization work is continuing to move ahead at an accelerated pace in both Subtask 3.2--Washability Analysis and Subtask 3.3-- Flotation Release Analyses. In addition, mineralogical analyses are underway as part of the characterization work. In Task 4--Bench-Scale Testing, the experimental program is now well underway to assess the trace element cleanability of the Pittsburgh No. 8 coal. Effort has also been initiated under Task 4--Toxics Fate Studies to identify viable methods for controlling the release of trace metals from refuse samples for the Pittsburgh No. 8 seam.
Date: July 19, 1996
Partner: UNT Libraries Government Documents Department

Precombustion removal of hazardous air pollutant precursors. Second quarterly technical progress report, January 1, 1996--March 31, 1996

Description: This project involves the development of an optimized, bench-scale processing circuit capable of efficiently removing trace elements from run-of-mine coals. The optimized circuit will be developed using characterization data obtained from detailed washability studies and release analyses tests conducted with several eastern US coals. The optimized circuit will incorporate a variety of conventional and advanced coal cleaning processes which are believed to be the most cost-effective and commercially viable. The coal products from the optimized circuit will be further treated with complexing agents specifically designed to extract organometallic trace elements that are difficult to remove by physical cleaning operations. Finally, innovative bioremediation schemes will be investigated as a means of controlling the release of trace elements from the process waste streams. Emphasis has been placed on the development of a processing circuit which (i) maximizes the rejection of trace elements, (ii) minimizes the production of coal fines which are costly to process and less marketable, and (iii) minimizes the downstream impacts of the process waste streams on the environment. During the past quarter, the project work plan and all associated technical/management reports were successfully approved by the COR (Subtask 1.1--Work Plan Development). Test work is now actively moving forward on several different fronts. In Subtask 2.2--Coal Procurement, arrangements have now been completed to procure/ship the three run-of-mine coals required to complete the project. All steps necessary to properly prepare and store these coals have been made under Subtask 2.3-- Preparation and Storage. For the Pittsburgh No. 8 coal, initial characterization studies have been initiated under Subtask 3.1-- Preliminary Analyses and Subtask 3.2--Washability Analysis.
Date: April 30, 1996
Partner: UNT Libraries Government Documents Department

DENSE MEDIA CYCLONE OPTIMIZATION

Description: The fieldwork associated with Task 1 (Baseline Assessment) was completed this quarter. Detailed cyclone inspections completed at all but one plant during maintenance shifts. Analysis of the test samples is also currently underway in Task 4 (Sample Analysis). A Draft Recommendation was prepared for the management at each test site in Task 2 (Circuit Modification). All required procurements were completed. Density tracers were manufactured and tested for quality control purposes. Special sampling tools were also purchased and/or fabricated for each plant site. The preliminary experimental data show that the partitioning performance for all seven HMC circuits was generally good. This was attributed to well-maintained cyclones and good operating practices. However, the density tracers detected that most circuits suffered from poor control of media cutpoint. These problems were attributed to poor x-ray calibration and improper manual density measurements. These conclusions will be validated after the analyses of the composite samples have been completed.
Date: September 10, 2001
Creator: Luttrell, Gerald H.
Partner: UNT Libraries Government Documents Department

Evaluation, engineering and development of advanced cyclone processes. Quarterly technical progress report No. 13, October 1, 1993-- December 31, 1993

Description: The project goal is to develop an advanced coal beneficiation technology that can achieve high recovery of the parent coal`s calorific value, while maximizing pyritic sulfur removal. Coal cleaning is to be accomplished by physical means incorporating an advanced form of cycloning or gravimetric process. Evaluation of different media types and their attendant systems for recovery, concentration, and regeneration is to be completed. Phase 1, Media Evaluation, now completed, involved a paper study and a number of laboratory tests to eliminate all but the best media options. Phase 2, Media Testing, involved detailed testing of the more promising media and separators in a closed-loop pilot facility. In the final phase, Phase 3, a 1,000 lb/hr open loop, bench scale plant will be designed and constructed using the optimum medium, separator, and medium recovery process based on information acquired during Phases 1 and 2 of the project. Major activities during this reporting period are reviewed below. The Bench Scale Circuit (BSC) design has been completed. The structural, electrical and other drawings are approved for construction and ready for contractor utilization. CTC contacted the Regional Office of the Virginia Department of Environmental Quality and ascertained that it was necessary to apply for a permit to operate the BSC. A Permit to construct and operate the BSC was applied for and granted shortly thereafter. Swenson has completed refurbishing the evaporator needed to regenerate dilute calcium nitrate medium. CTC awaits a suitable stage in construction of the BSC to schedule delivery and placement of the unit. Quotes were obtained from Power and Heat Systems for a boiler, and from Swenson for an organic medium evaporator/condenser system. Both were specified for a 200 TPH coal feed process and will be used in future economic comparisons.
Date: December 31, 1993
Partner: UNT Libraries Government Documents Department

Evaluation, engineering and development of advanced cyclone processes. Quarterly progress report, October 1, 1995--December 31, 1995

Description: The project goal is to develop an advanced coal beneficiation technology that can achieve high recovery of the parent coal`s calorific value, while maximizing pyritic sulfur removal. Coal cleaning is to be accomplished by physical means incorporating an advanced gravimetric process. Evaluation of different media types and their attendant systems for recovery, concentration, and regeneration is to be completed. Phase I, Media Evaluation, now completed, involved a paper study and a number of laboratory tests to eliminate all but the best media options. Phase II, Media Testing, involved detailed testing of the more promising media and separators in a closed-loop pilot facility. In the final phase, Phase III, the optimum medium, separator, and medium recovery system(s) will be tested with commercial-size equipment. Major activities and developments that occurred during this reporting period are reviewed below. Revision of the Component Test Plan continued through this reporting period. Work on the component Test Stand included the following. Mixers were installed in the primary sumps. Solids bearing slurry was introduced to the two main sumps and pumped through the system. Several small leaks were detected and repaired. Corrosion was found on the clean coal pump inlet side and repaired. The control system for the filter was wired. Roofing and heating for the Component Test Stand were installed by CTC personnel. Siding was installed by a local contractor.
Date: December 31, 1995
Partner: UNT Libraries Government Documents Department

Evaluation, engineering and development of advanced cyclone processes. Quarterly technical progress report No. 15, April 1, 1994--June 30, 1994

Description: The project goal is to develop an advanced coal beneficiation technology that can achieve high recovery of the parent coal`s calorific value, while maximizing pyritic sulfur removal. Coal cleaning is to be accomplished by physical means incorporating an advanced form of cycloning or gravimetric process. Evaluation of different media types and their attendant systems for recovery, concentration, and regeneration is to be completed. Phase I, media evaluation, now completed involved a paper study and a number of laboratory tests to eliminate all but the best media options. Phase II, media testing, involved detailed testing of the more promising media and separators in a closed-loop pilot facility circuit. In the final phase, Phase III, it is proposed to test individual components of the process using the optimum medium, separator, and medium recovery systems(s) selected in prior phases. Some of the highlights for this reporting period are: (1) Outomec conducted a second set of hot water wash experiments. These hot water experiments, using prefiltered medium, yielded a significant improvement in calcium nitrate recovery, and showed a consistent decrease in residuum calcium nitrate with increasing wash rate. (2) Several alternatives were investigated for potential reduction in thermal regeneration process costs. Culligan, Spin Tek, and Rochem, manufacturers of reverse osmosis or ultra filtration systems were contacted. Rochem ultimately performed laboratory experiments. Starting with a dilute medium density of 1.07, the Rochem laboratory system achieved a density of 1.11. A density of 1.22 sg would be commercially attainable. This is less than the target medium density of 1.35, meaning that if their system were utilized, some thermal means would still be required to regenerate medium to operating density. (3) Management and Technical Systems initiated work on a preliminary economic study and will submit a report during the next quarterly reporting period.
Date: December 31, 1994
Partner: UNT Libraries Government Documents Department

Evaluation, engineering and development of advanced cyclone processes. Quarterly progress report, April 1, 1995--June 30, 1995

Description: The project goal is to develop an advanced coal beneficiation technology that can achieve high recovery of the parent coal`s calorific value, while maximizing pyritic sulfur removal. Coal cleaning is to be accomplished by physical means incorporating an advanced gravimetric process. Evaluation of different media types and their attendant systems for recovery, concentration, and regeneration is to be completed. Phase I, media evaluation, now completed,involved a paper study and a number of laboratory tests to eliminate all but the best media options. Phase II, media testing, involved detailed testing of the more promising media and separators in a closed-loop pilot facility. In the final phase, Phase III, the optimum medium, separator, and medium recovery system(s) will be tested with commercial-size equipment. steel erection for the component test stand (CTS) was completed. The foundation and flooring were readied for vessel and equipment placement. A draft component test plan was submitted. Froth flotation product and thickener underflow stream samples were obtained from the American Electronic Power Midges 31 coal preparation plant. This material is to be used in filtration studies.
Date: December 31, 1995
Partner: UNT Libraries Government Documents Department

Installation of a stoker-coal preparation plant in Krakow, Poland. Technical progress report 11, October--December 1996

Description: This project is one of eight projects selected under the assessment program in the Support of Eastern Democracy (SEED) Act of 0989 by the federal government to reduce low-level emission sources in the Krakow area of Poland. The objective of this Cooperative Agreement is to demonstrate that the quality of stack gas emissions can be improved through the substitution of run-of-mine coal by washed coal. To this end, EFH Coal Company will design, build, and operate a 300-mtph (330 stph) preparation plant and produce a low ash, double-screened washed coal for burning in a traveling-grate stoker in one of the many water heating plants in the city of Krakow. By burning this prepared coal under proper combustion condition, combustion efficiency will be increased, stoker maintenance will be lowered and the amount of carbon monoxide, sulfur dioxide and particulates in the stack gases will be reduced significantly. Contracts to: provide the raw-coal feed to the plant; dispose of plant wastes; burn the clean coal in a demonstration water heating plant in Krakow; and to market any surplus production are in place. An international irrevocable purchase order has been let for the procurement of a customized modular 300 mtph (330 stph) dense medium cyclone preparation plant to wash the 20 mm ({approx} 3/4 in.) by 5 mm. ({approx} 1/4 in.) size fraction of raw coal produced by the Katowice Coal Holding Company. This plant will be fabricated and shipped from the United States to Poland as soon as the final land-us and construction permits are granted.
Date: January 1, 1997
Partner: UNT Libraries Government Documents Department

Engineering development of advanced froth flotation. Volume 2, Final report

Description: This report is an account of findings related to the Engineering and Development of Advanced Froth Flotation project. The results from benchscale and proof-of-concept (POC) level testing are presented and the important results from this testing are used to refine a conceptual design and cost estimate for a 20 TPH Semi-Works Facility incorporating the final proposed technology.
Date: March 1, 1995
Creator: Ferris, D.D.; Bencho, J.R. & Torak, E.R.
Partner: UNT Libraries Government Documents Department

Effect of coal beneficiation process on rheology/atomization of coal water slurries. Quarterly progress report, January 1--March 31, 1993

Description: The overall objective of this project is to perform experiments to understand the effect of coal beneficiation processes and high shear rheological properties on the atomization of coal-water slurries (CWS). In the atomization studies, the mean drop size of the CWS sprays will be determined at various air-to CWS. A correlation between the high shear rheological properties, particle size distributions and the atomization will be made in order to determine the influence of these parameters on the atomization of CWS. The paper discusses FTIR analysis, wet grinding, flotation cleaned coal, and heavy media cleaned coal.
Date: December 31, 1993
Creator: Ohene, F.
Partner: UNT Libraries Government Documents Department

Evaluation, engineering and development of advanced cyclone processes. Quarterly report, July 1, 1994--September 30, 1994

Description: The project goal is to develop an advanced coal beneficiation technology that can achieve high recovery of the parent coal`s calorific value, while maximizing pyritic sulfur removal. Coal cleaning is to be accomplished by physical means incorporating an advanced gravimetric process. Evaluation of different media types and their attendant systems for recovery, concentration, and regeneration is to be completed. Phase 1, Media Evaluation, now completed, involved a paper study and a number of laboratory tests ta eliminate all but the best media options. Phase 2, Media Testing, involved detailed testing of the more promising media and separators in a closed-loop pilot facility. In the final phase, Phase 3, it is proposed to test individual components of the process using the optimum medium, separator, and medium recovery system(s) selected in prior phases. Major activities and developments that occurred during this reporting period are reviewed below. CTC prepared for and participated in the Contractors Conference held July 18, 19 and 20, 1994, during which a draft of the pending revised Work Plan was provided and informally discussed. Recent revisions have focused on the scope of the component testing program for the disk filter and decanter centrifuge.
Date: December 31, 1994
Partner: UNT Libraries Government Documents Department

Effect of coal beneficiation process on rheology/atomization of coal water slurries. Quarterly progress report, April 1, 1995--June 30, 1995

Description: The overall objective of this project is to perform experiments to understand the effect of coal beneficiation processes and high shear rheological properties on the atomization of coal-water slurries (CWS). In the atomization studies, the mean drop size of the CWS sprays will be determined at various air to CWS. A correlation between the high shear rheological properties, particle size distributions and the atomization will be made in order to determine the influence of these parameters on the atomization of CWS. Rheological properties of the CWS samples were determined after a six month storage period and the properties compared to freshly prepared samples. The rheological evaluations made include: flow characteristics under low shear rates; flow characteristics under high shear rates; and viscoelastic behavior under low frequency of oscillations. All the three CWS samples formed a hard pack solid at the end of the six month storage period, and had to be redispersed. The flotation cleaned coal and the heavy-media cleaned coal however, had the tendency to settle much faster than the uncleaned coal. Each of them remained completely dispersed during the duration of the testing period.
Date: October 1, 1995
Creator: Ohene, F.
Partner: UNT Libraries Government Documents Department

Bench-scale testing of the multi-gravity separator in combination with Microcel. Volume of Appendices, Final report

Description: This volume contains the following appendices: Circuit design; test data and performance calculations; Box-Behnken statistical analysis; Response surface plots and computations; Test data and performance calculations; Long-duration test data and performance calculations; MGS partition curve data; Near-term test data and performance calculations; Economic evaluation; and CPPRF circuit drawings.
Date: March 1, 1995
Creator: Luttrell, G.H.; Venkatraman, P.; Phillips, D.I. & Yoon, Roe-Hoan
Partner: UNT Libraries Government Documents Department

Bench scale testing of micronized magnetite beneficiation. Quarterly technical progress report 3, July--September, 1993

Description: This project is aimed at development of a process that, by using ultra fine magnetite suspension, would expand the application of heavy media separation technology to processing fine, {minus}28 mesh coals. These coal fines, produced during coal mining and crushing, are separated in the conventional coal preparation plant and generally impounded in a tailings pond. Development of an economic process for processing these fines into marketable product will expand the utilization of coal for power production in an environmentally acceptable and economically viable way. This process has been successfully researched at PETC but has not been studied on a continuous bench-scale unit, which is a necessary step towards commercial development of this promising technology. The goal of the program is to investigate the technology in a continuous circuit at a reasonable scale to provide a design basis for larger plants and a commercial feasibility data.
Date: October 29, 1993
Creator: Anast, K.
Partner: UNT Libraries Government Documents Department

Bench scale testing of micronized magnetite beneficiation. Quarterly technical progress report 4, October--December, 1993

Description: This project is aimed at development of a process that, by using ultra fine magnetite suspension, would expand the application of heavy media separation technology to processing fine, {minus}28 mesh coals. These coal fines, produced during coal mining and crushing, are separated in the conventional coal preparation plant and generally impounded in a tailings pond. Development of an economic process for processing these fines into marketable product will expand the utilization of coal for power production in an environmentally acceptable and economically viable way. This process has been successfully researched at PETC but has not been studied on a continuous bench-scale unit, which is a necessary step towards commercial development of this promising technology. The goal of the program is to investigate the technology in a continuous circuit at a reasonable scale to provide a design basis for larger plants and a commercial feasibility data.
Date: January 25, 1994
Creator: Anast, K.
Partner: UNT Libraries Government Documents Department

Precombustion removal of hazardous air pollutant precursors. Technical progress report, July 1, 1996--September 30, 1996

Description: This project involves the development of an optimized, bench-scale processing circuit capable of efficiently removing trace elements from run-of-mine coals. The optimized circuit will be developed using characterization data obtained from detailed washability studies and release analyses tests conducted with several eastern U.S. coals. The optimized circuit will incorporate a variety of conventional and advanced coal cleaning processes. The coal products from the optimized circuit will be further treated with complexing agents specifically designed to extract organometallic trace elements that are difficult to remove by physical cleaning operations. Finally, innovative bioremediation schemes will be investigated as a means of controlling the release of trace elements from the process waste streams. Emphasis has been placed on the development of a processing circuit which (i) maximizes the rejection of trace elements, (ii) minimizes the production of coal fines which are costly to process and less marketable, and (iii) minimizes the downstream impacts of the process waste on the environment. During the past quarter, several key subtasks were completed. Most of the characterization tests for the Pittsburgh No. 8 coal have now been concluded. These include all activities associated with Subtasks 3.2 washability analysis, 3.3 flotation release analysis, and 3.4 SEM/image analysis. A large portion of the bench-scale test work was also completed during the past quarter for the Pittsburgh No. 8 coal under Subtask 4.1 heavy media testing. Additional bench-scale tests are underway as outlined in Subtask 4.2 froth flotation and 4.3 enhanced gravity separation. Finally, experiments conducted under Subtasks 6.1 analysis of pond toxics and 6.2 control method evaluation using samples of refuse from the Pittsburgh No. 8 seam indicate that significant reductions (up to 90%) in trace element content can be achieved through the application of microbial mats.
Date: September 19, 1996
Partner: UNT Libraries Government Documents Department

In-plant testing of a novel coal cleaning circuit using advanced technologies. Technical report, September 1--November 30, 1995

Description: A circuit utilizing hindered-bed classifiers, enhanced gravity concentrators and column flotation has been found to provide a highly efficient cleaning of fine coal in which both ash and total sulfur contents are significantly reduced while maximizing the recovery of coal. In this study, a circuit comprised of the three technologies will be tested in an operating preparation plant to evaluate circuit performance and to compare the performance with the current technologies used to treat fine coal. Prior to the in-plant testing, the effect of changing feed characteristics on the performance of the enhanced gravity concentrator was evaluated for process control purposes. During this reporting period, a {minus}16 mesh Illinois No. 6 coal sample containing about 30% ash and 8.0% total sulfur was collected from a refuse pond. The ash and total sulfur contents of the sample were depleted by withdrawing a controlled amount of tailings produced by the unit to determine the effect of changing feed compositions. It was found that higher combustible recovery values are achieved when the feed ash content is decreased and slightly lower product sulfur content values are obtained when the pyritic sulfur content in the feed is decreased. The lower total sulfur contents are most likely due to the natural by-pass to the product stream of 5--10% of the heavy particles. In other words, an increase in the feed sulfur content results in an incremental increase in the sulfur content of the product. The higher combustible recovery values obtained with decreasing feed ash contents are likely due to a reduction in the amount of entrapped coal particles within the bed of heavy-particles formed contiguous to the bowl wall in the Falcon unit. Higher bowl speeds and adjustment of the tailings rate have been found to counter the negative effects caused by the increase in feed ...
Date: December 31, 1995
Creator: Honaker, R.Q. & Reed, S.
Partner: UNT Libraries Government Documents Department

Bench-scale testing of the micronized magnetite process. Seventh quarterly technical progress report, January--March, 1996

Description: The major focus of the project is to install and test a 500 lbs./hr. fine-coal cleaning circuit at DOE`s Process Research Facility (PRF), located at the Pittsburgh Energy Technology Center (PETC). The circuit will utilize an extremely fine, micron-sized magnetite media and small diameter cyclones to make efficient density separations on minus-28-Mesh coal. The circuit consists of three subcircuits: Classification Circuit; Dense-Medium Cycloning Circuit; and Magnetite Recovery Circuit. The testing scope involves initial closed-loop testing of each subcircuit to optimize the performance of the equipment in each subcircuit (i.e., Component Testing), followed by open-circuit testing of the entire integrated circuit to optimize the process and quantify the process efficiency (i.e., Integrated Testing). This report contains a short discussion of the project description, objectives, budget, schedule, and teaming arrangement. It also includes a detailed discussion of the above mentioned project accomplishments and plans, organized by the various task series within the project work plan. The final section contains an outline of the specific project goals for the next quarterly reporting period.
Date: August 13, 1996
Partner: UNT Libraries Government Documents Department