Barite containing 80.8% barium sulfate and 16.3% silica is ground to 325 mesh and floated at a pH of 8.6, using pr ton of feed: 1.5 lb of soda ash to adjust pH, 3.0 lb of sodium silicate as a dispersing agent, 2.5 lb of Pamak 4 and 0.25 pound of fuel oil as the collectors, 0.65 lb of quebracho as a depressant, and 2.5 lb of alcohol as a wetting agent. A 65% recovery is obtained of a concentrate assaying 97% barium sulfate.
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