Poc-Scale Testing of a Dry Triboelectrostatic Separator for Fine Coal Cleaning Page: 3 of 27
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Abstract
It is the objective of the project to further develop the triboelectrostatic separation (TES)
process developed at the Federal Energy Technology Center (FETC) and to test the process at a
proof-of-concept (POC) scale. This process has a distinct advantage over other coal cleaning
processes in that it does not entail costly steps of dewatering. The POC-scale unit is to be
developed based on i) the charging characteristics of coal and mineral matter that can be
determined using the novel on-line tribocharge measuring device developed at Virginia Tech and
ii) the results obtained from bench-scale TES tests conducted on three different coals.
During the past quarter, most of the personnel assigned to this project have been
performing work elements associated with the engineering design (Task 3) of the TES process.
This activity has been subdivided into three subtasks, i.e., Charger Tests (Subtask 3.1), Separator
Tests (Subtask 3.2), and Final POC Design (Subtask 3.3). In Subtask 3.1, several different
tribocharging devices have been constructed using materials of various work functions. They are
currently being tested to establish the best materials to be used for designing and manufacturing
the optimum tribochargers that can maximum charge differences between coal and mineral
matter. In Subtask 3.2, bench-scale cleaning tests have been conducted to study the effects of the
various operating and design parameters on the performance of the electrostatic separator. Two
different TES units have been tested to date. One uses drum-type electrodes to separate charged
particles, while the other uses plate-type electrodes for the separation. The test results showed
that a major improvement in separation efficiency can be achieved by recycling the middlings
back to the feed stream. It has also been established that the major source of inefficiency arises
from the difficulty in separating ultrafine particles. Understanding the behavior of the ultrafineiii
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Yan, E. S.; Luttrell, G. H.; Adel, G. T. & Yoon, R. H. Poc-Scale Testing of a Dry Triboelectrostatic Separator for Fine Coal Cleaning, report, March 10, 1999; Morgantown, West Virginia. (https://digital.library.unt.edu/ark:/67531/metadc624798/m1/3/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.