Removal of undesirable substances from finely divided particles

Details Removal of undesirable substances from finely divided particles Removal of undesirable substances from finely divided particles

1984-09-10

1986-03-04

Lutter, Frank W.

Classifying, separating, and assorting solids

With heat treatment

209 12, 209142, 209144, 44 1SR, 44 26, 34 10, 34 57R, B07B 902

Patent

active

045740453

ABSTRACT:
Substance particulate in the general size range of minus 30 Mesh U.S. Standard to about 1 micron is separated into portions based on the densities of those components making up the total by drying to about 1% moisture and air conveying the substance through a duct in which the material assumes a stratified arrangement dictated by particle density. Means are provided by air duct configuration and partial flow diversion to remove appropriate laminar segments of the air-solids mixture.
Light, medium and heavy ash and pyritic Sulfur in substantial percentages can be removed from bituminous coal fines embodying this principle in a negative air atmosphere. After beneficiation of bituminous coal fines any undesired pyritic or organic Sulfur can be contained by intimately mixing calcium hydroxide with the coal in the amount of 2.24 parts of calcium hydroxide to one (1) part of Sulfur by weight. Approximately 41/2% ash by weight will be generated for each 1% elemental Sulphur contained from the fine coal particulate upon heating and combustion.

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