| abstract |
FIELD: chemistry. n SUBSTANCE: composition contains at least one quaternary ammonium compound that is a collector in the reverse flotation of magnesium minerals from calcium carbonate, at least one antifoaming agent and at least one solvent. The defoamer is selected from the group consisting of alkyl benzenes and at least one ethoxylated alcohol corresponding to the formulas R-O-(A-O) n -H (6) and R-O-(A-O) n (B-O) m -H (7), where n is the number of 1-30, m is the number 1-30, A is C 2 -C 4 Alkylene group, B is C 2 -C 4 Alkylene group, R is C 6 -C 30 Hydrocarbon group. The amount of component A is 20-60 wt %, the amount of component B is 5-25 wt % and the component C is 15-75 wt %. This composition is used as a flotation reagent in the reverse flotation of silicate minerals of magnesium from calcium carbonate ore. A method for the reverse flotation of silicate magnesium minerals from calcium carbonate ore comprises adding the above composition to a flotation cell containing magnesium silicate minerals and calcium carbonate ore, then passing air through the flotation cell and removing the silicate magnesium minerals obtained in this way by the foam. n EFFECT: increasing the efficiency of flotation of silicate minerals of magnesium from calcium carbonate ore. n 21 cl, 9 tbl, 4 ex |