Process for electrostatic separation of pyrite from crude coal
AssigneeKali und Salz Aktiengesellschaft
InventorsArno Singewald, Gunther Fricke
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Abstract
An improved process is disclosed for electrostatic separation of pyrite from powdered crude coal comprising vigorously mixing the powdered crude coal with a selected fatty acid glyceride as a conditioning substance and conducting the electrostatic separation at a relative humidity of 2.5-20% and a temperature between room temperature and 100.degree. C. In a multiple stage process yields of purified coal substantially greater than those of prior art processes can be obtained.
Claims12
A process for electrostatic separation of particles of pyrite from powdered crude coal in a mixture thereof at a temperature between room temperature and 100.degree.C, by contact electrification of said particles, comprising
- a. vigorously mixing said particles with a conditioning substance comprising glycerides of high and middle saturated and unsaturated fatty acids for a period of between 10 seconds and 30 minutes and in quantities of about 100-2000 grams per ton of powdered crude coal, thereby to form conditioned electrified particles thereof in said field, and
- b. separating said conditioned electrified particles in an electric field produced by a free falling plate type separator according to their charge at a relative humidity of about 2.5-20% whereby there is obtained a first purified coal concentrate, a first residue containing the greater portion of the pyrite, and an intermediate fraction.
Dependencies are inferred from the claim text.