Classifying – separating – and assorting solids – Precedent preparation of items or materials to facilitate... – Selective differentiation
Patent
1984-12-10
1985-11-26
Nozick, Bernard
Classifying, separating, and assorting solids
Precedent preparation of items or materials to facilitate...
Selective differentiation
B03D 306
Patent
active
045553297
ABSTRACT:
A method for separating inorganic gangues from coal particulates dispersed in a coal refuse slurry comprises the selective flocculation of the coal refuse slurry by initially adding an anionic dispersant followed subsequently by adding an anionic flocculant, allowing the flocculating coal slurry obtained to settle and collecting a concentrated settled coal slurry having a lowered ash value. The dispersed inorganic gangues may be recovered by the addition of a cationic flocculant/coagulant with subsequent recycle of the aqueous phase.
REFERENCES:
patent: 3055827 (1962-09-01), Wileg
patent: 3408293 (1968-10-01), Dajani et al.
patent: 4210531 (1980-07-01), Wang et al.
Symposium on Water Soluble Polymers, Bad Nauheim, West Germany 4/84--Dr. Hartan Chemische Fabrik Stockhausen.
Connelly Lawrence J.
Roe William J.
Sykes Robert C.
Epple Donald G.
Nalco Chemical Company
Nozick Bernard
Premo John G.
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