METHOD OF PREPARING CARNALLITE Russian patent published in 1996 - IPC

FIELD: chemical engineering. SUBSTANCE: carnallite designated for production of magnesium and chlorine without injurious exhaust of hydrogen chloride and with increased isolation degree of magnesium chloride and increased furnace capacity is carried out by crystallizing and concentrating salt suspension followed by its filtration on centrifuge with separating crystallize from mother liquor and its recycling. Crystallize is washed with calcium chloride solution in amount of 6-18% based on mass of filtered off crystallize. Resultant liquid phase is separated and recycled. Difference between the calcium chloride concentration in taken solution and mother liquor is 6 to 35 wt %. EFFECT: enhanced efficiency of process and environmental safety. 1 dwg, 1 tbl