Continuous separation of dry crushed coal at one ton per hour by highgradient magnetic separation
Abstract
The separation of pyritic sulfur and ash forming minerals from dry crushed coal in a small, cyclic, high gradient magnetic separator over a range of each of the process parameters was tested. A band of operating conditions that affected reductions of the mineral contaminants and recoveries of the heating value comparable to gravimetric separations was defined. The procedures and results of an experimental program to extrapolate from the small, cyclic separations to continuous, pilot scale separation at a feed rate of 1 ton/h are described. The program testing magnetic preparation of dry crushed coal has demonstrated that: (1) dry crushed coal in the size range of about 600 x 45 microns can be effectively cleaned by magnetic separation techniques; (2) product quality and heating value recovery by the high gradient magnetic process approaches that obtained by a laboratory gravimetric separation of the same size fraction; and (3) separations performed on size fractions from 600 to 45 microns at a feed rate of 1 ton/h in a continuous, industrial type high gradient magnetic separator equal those obtained in a cyclic laboratory separator.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 December 1981
 Bibcode:
 1981STIN...8316567H
 Keywords:

 Coal;
 Magnetic Properties;
 Pyrites;
 Separators;
 Contaminants;
 Gravimetry;
 Mathematical Models;
 Pilot Plants;
 Engineering (General)