Process for granulating metal sulfide powders
AssigneeNihon Kogyo Kabushiki Kaisha
InventorsHaruki Sato, Yoshio Kawasumi
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Abstract
A process for granulating metal sulfide powders comprises the steps of adding a solution of thermosetting resin in a volatile organic solvent, as a binder, to a metal sulfide powder as the starting material, forming the mixture thus obtained into granules by a granulator, drying the granulation product, sieving the dried product for classification and recovering the granules within desired limits of particle size, recycling the fines after the sieve classification, with the addition of only the volatile organic solvent, as the material, and heating the granules within the desired limits of particle size for curing. Coarse particles separated out by the sieve classification are pulverized and recycled as the material, with the addition of only the volatile organic solvent.
Claims15
A process for granulating metal sulfide powders, which comprises the steps of
- (a) adding and mixing a solution of thermosetting resin in a volatile organic solvent, as a binder, to a metal sulfide powder as the starting material,
- (b) forming the mixture obtained in the step (a) into granules by a granulator,
- (c) drying the granules at a temperature below the hardening temperature of said thermosetting resin,
- (d) sieving the dried granules for classification and recovering the granules within desired limits of particle size,
- (e) recycling the fines after the sieve classification to the granulator with the addition of said volatile organic solvent, and
- (f) heating and curing said granules within the desired limits of particle size.
A process for granulating metal sulfide powders, which comprises the steps of
- (a) adding and mixing a solution of thermosetting resin in a volatile organic solvent, as a binder, to a metal sulfide powder as the starting material,
- (b) forming the mixture obtained in the step (a) into granules by a granulator,
- (c) drying the granules at a temperature below the hardening temperature of said thermosetting resin,
- (d) sieving the dried granules for classification and recovering the granules within desired limits of particle size,
- (e) recycling the fines after the sieve classification to the granulator with the addition of said volatile organic solvent,
- (f) separating coarse particles by said sieve classification, disintegrating said particles so that at least 20 to 30 percent by weight are rendered smaller than the desired particle size, and recycling the resulting powder to the granulator with the addition of said volatile organic solvent, and
- (g) heating and curing said granules within the desired limits of particle size.
Dependencies are inferred from the claim text.