Classifying – separating – and assorting solids – Precedent preparation of items or materials to facilitate... – Sorting special items or sorting by methods and apparatus...
Patent
1981-11-13
1984-05-22
Nozick, Bernard
Classifying, separating, and assorting solids
Precedent preparation of items or materials to facilitate...
Sorting special items or sorting by methods and apparatus...
209166, 209167, 252 61, B03B 100
Patent
active
044500700
ABSTRACT:
Froth flotation of oxidized coal in the presence of certain imidazoline or imidazolinium salts improves both the selectivity and recovery attained. Imidazolines found particularly efficacious are those bearing a fatty alkyl group in the 2- position and an N-aminoethyl or N-hydroxyethyl group. Preferred imidazolinium salts are those corresponding to the following formula: ##STR1## wherein R is a C.sub.6 to C.sub.22 alkyl or alkenyl group.
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P. S. Belov et al., Abhanlungen Akademie der Wissenschaften der DDR, vol. 1, No. 4, pp. 225-233 (1976).
Nozick Bernard
The Dow Chemical Company
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