Recovery of ultrafine barite from mill wastes.
Tuscaloosa, AL: U.S. Department of the Interior, Bureau of Mines, RI 8668, 1982 Jan; :1-12
The Bureau of Mines conducted flotation tests on a mixture of barite waste materials from Nevada in which essentially all of the barite values were finer than 20 micrometers. Flotation variables investigated in these tests were the effects of (1) sodium silicate as a pulp dispersant, (2) sodium hydroxide as a pH modifier, (3) increased amounts of sodium cetyl sulfate, (4) conditioning time, and (5) solids content during conditioning. The optimum flotation conditions were achieved by adding 2.5 pounds of sodium silicate and 10 pounds of sodium cetyl sulfate per ton of feed and conditioning the pulp for 20 minutes at a 35-percent solids content. Using these conditions, a concentrate was produced that contained 94.7 percent BaSO4, with an attendant recovery of 90.9 percent of the barite in the feed. In addition to the flotation tests, a selective barite flocculation process was developed to treat extremely fine barite. A barite concentrate containing 96.5 percent BaSO4 with an attendant recovery of 82.1 percent of the barite was produced by selective flocculation. A process patent application has been filed based on this process.
IH; Report of Investigations
Tuscaloosa, AL: U.S. Department of the Interior, Bureau of Mines, RI 8668