Kinetics of silica deposition from simulated geothermal brines

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Supersaturated brines were passed through columns packed with several forms of silica (crystalline ..cap alpha.. quartz, polycrystalline ..cap alpha.. quartz, and porous Vycor). Also, silica deposition on ThO/sub 2/ microspheres and titanium powder was studied under controlled conditions of supersaturation, pH, temperature, and salinity. The residence time was varied by adjustments of flow rate and column length. The silica contents of the input and effluent solutions were determined colorimetrically by a molybdate method which does not include polymers without special pretreatment. Essentially identical deposition behavior was observed once the substrate was thoroughly coated with amorphous silica and the BET surface ... continued below

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Medium: P; Size: Pages: 45

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Bohlmann, E.G.; Mesmer, R.E. & Berlinski, P. March 1, 1980.

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Description

Supersaturated brines were passed through columns packed with several forms of silica (crystalline ..cap alpha.. quartz, polycrystalline ..cap alpha.. quartz, and porous Vycor). Also, silica deposition on ThO/sub 2/ microspheres and titanium powder was studied under controlled conditions of supersaturation, pH, temperature, and salinity. The residence time was varied by adjustments of flow rate and column length. The silica contents of the input and effluent solutions were determined colorimetrically by a molybdate method which does not include polymers without special pretreatment. Essentially identical deposition behavior was observed once the substrate was thoroughly coated with amorphous silica and the BET surface area of the coated particles was taken into account. The reaction rate is not diffusion limited in the columns. The silica deposition is a function of the monomeric Si(OH)/sub 4/ concentration in the brine. The deposition on all surfaces examined was spontaneously nucleated. The dependence on the supersaturation concentration, hydroxide ion concentration, surface area, temperature and salinity were examined. Fluoride was shown to have no effect at pH 5.94 and low salinity. The empirical rate law which describes the data in 1 m NaCl in the pH range 5-7 and temperatures from 60 to 120/sup 0/C is given.

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Medium: P; Size: Pages: 45

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Dep. NTIS, PC A03/MF A01.

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  • Report No.: ORNL/TM-7117
  • Grant Number: W-7405-ENG-26
  • DOI: 10.2172/5477234 | External Link
  • Office of Scientific & Technical Information Report Number: 5477234
  • Archival Resource Key: ark:/67531/metadc1093398

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • March 1, 1980

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • April 5, 2018, 12:38 p.m.

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Bohlmann, E.G.; Mesmer, R.E. & Berlinski, P. Kinetics of silica deposition from simulated geothermal brines, report, March 1, 1980; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1093398/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.