Silicone glycol collectors in the beneficiation of fine coal by froth flotation
AssigneeDow Corning Corporation
InventorMichael J. Owen
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Abstract
A froth flotation process for the beneficiation of fine coal is disclosed which employs as a collector a water-dispersible polyorganosiloxane or a mixture of water-dispersible polyorganosiloxanes which contain organic radicals selected from the group consisting of polyethylene oxide and polypropylene oxide radicals. The process of this invention is especially useful for the beneficiation of difficult-to-float fine coals.
Claims16
A froth flotation process for the beneficiation of fine coal, which process comprises the steps of forming an aqueous slurry of the fine coal, adding a collector and a frothing agent to the aqueous slurry of fine coal, subjecting the aqueous slurry of fine coal containing the collector and frothing agent to froth flotation, and separating the floated material which consists essentially of the beneficiated fine coal, wherein the collector is a water-dispersible polyorganosiloxane or a mixture of water-dispersible polyorganosiloxanes of general formula
- R.sub.a Q.sub.b SiO.sub.(4-a-b)/2
- wherein the sum (a+b) has an average value of 0.9 to 2.7, a has an average value of zero to less than four, b has an average value of greater than zero to less than four, R is a monovalent alkyl radical containing from 1 to 20, inclusive, carbon atoms or a --OH radical, and Q is an organic radical attached to silicon through a Si--C bond and selected from the group consisting of polyethylene oxide radicals and polypropylene oxide radicals.
A froth flotation process for the beneficiation of fine coal, which process comprises the steps of forming an aqueous slurry of the fine coal, adding a collector and a frothing agent to the aqueous slurry of fine coal, subjecting the aqueous slurry of fine coal containing the collector and frothing agent to froth flotation, and separating the floated material which consists essentially of the beneficiated fine coal, wherein the collector is a water-dispersible polyorganosiloxane or a mixture of water-dispersible polyorganosiloxanes of general formula
- Q.sub.c R.sub.(3-c) SiO[R.sub.2 'SiO].sub.n [R'QSiO].sub.m SiR.sub.(3-d) Q.sub.d
- where n has a value of 0 to 25, inclusive;
- m has a value of 0 to 12, inclusive;
- c and d are both independently equal to 0 or 1;
- the sum (m+c+d) is equal to or greater than 1;
- R is a monovalent alkyl radical containing from 1 to 20, inclusive, carbon atoms or a --OH radical;
- R' is a monovalent alkyl radical containing from 1 to 20, inclusive, carbon atoms;
- and Q is an organic radical attached to silicon through a Si--C bond and selected from the group consisting of polyethylene oxide radicals and polypropylene oxide radicals.
Dependencies are inferred from the claim text.