Froth promotor for flotation of coal
AssigneeThe Dow Chemical Company
InventorWilfred C. Meyer
Life of this patent
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Abstract
Aromatic polycyclic, hydrocarbon compounds bearing at least one nuclear sulfonic acid or sulfonate moiety are useful as froth promoters to improve the recovery of clean coal in the froth flotation of finely-divided coal. Disulfonated diphenyl ether compounds bearing at least one nuclear alkyl group of from 10 to 22 carbon atoms are particularly efficacious.
Claims8
A froth flotation process for beneficiating coal comprising floating coal particles of flotation size in a frothing aqueous medium in the presence of an effective amount of a froth promoter corresponding to the formula ##STR2## wherein x and y are each independently the integer 0 or 1;
- k and j are each independently the integer 0 or 1 with the proviso that the sum of k and j is at least 1;
- each R is an alkyl radical and each R can be the same or different;
- f is the integer 1;
- and
- M.sub.1 and M.sub.2 are each independently sodium or potassium.
A froth flotation process for beneficiating coal comprising floating coal particles of flotation size in a frothing aqueous medium containing a frother mixture of a branched C.sub.4 -C.sub.8 alkanol and a predominant amount of polypropylene glycol having a weight average molecular weight from 200 to 600 and an effective amount of a froth promoter corresponding to the formula ##STR3## wherein x and y are each independently the integer 0 or 1 and the sum of x and y is at least 1;
- k and j are each independently the integer 0 or 1 with the proviso that the sum of k and j is at least 1;
- each R is a C.sub.8 to C.sub.20 alkyl radical and each R can be the same or different;
- and
- M.sub.1 is sodium and M.sub.2 is a primary ammonium bearing a C.sub.4 -C.sub.8 alkyl.
Dependencies are inferred from the claim text.