METHOD OF PROCESSING CARNALLITE ORES Russian patent published in 1999 - IPC

FIELD: process of production of concentrated carnallite. SUBSTANCE: method includes grinding of ore, introduction of collector, flotation separation of anhydrite, water-insoluble clay slimes and halite and obtaining of carnallite in the form of flotation cell product. Anhydrite is separated in two stages, first, from ore and then from concentrated carnallite. Ratio of quantities of anhydrite separated at the first and second stages is from 1: 0.5 to 1:2.4, respectively. To raise selectivity and efficiency of flotation separation of anhydrite, concentrated carnallite before the second separation stage of anhydrite is dewatered to free water content of not in excess of 15%. EFFECT: higher quality of carnallite due to reduced content of calcium sulfate in it. 2 cl, 2 tbl