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Direct Flotation of Potash from Carnallite.
Foot-DG Jr.; Jordan-CE; Huiatt-JL
MISSING :11 pages
The Bureau of Mines devised a direct flotation method for recovering potash from carnallite (kcl.Mgcl2.6H2o) ore characterized by a high content of water-insoluble impurities. The method includes (1) a decomposition leach of the carnallite, (2) flocculation-depression of the insoluble slimes, (3) potash rougher, cleaner, and recleaner flotation, and (4) final product leaching. The technique eliminates the necessity for removing the water-insoluble slimes by mechanical or flotation desliming. Laboratory results demonstrated that the direct flotation procedure, when compared with conventional techniques, yielded equivalent or improved flotation results with equal or less reagent consumption. Locked-cycle testing of the direct flotation method recovered 87.8 pct of the potassium in the flotation feed in a final product containing 60.6 pct k2o. A flowsheet incorporating the carnallite leaching-potash flotation procedure is presented.
IH; Report of Investigations
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division