Obtaining artificial carnallites from magnesium chloride brines
https://doi.org/10.29235/1561-8331-2020-56-2-229-234
Abstract
The excess of magnesium chloride brines is formed during the polymineral ores processing in order to obtain potassium sulfate. One way to regenerate such brines is to produce artificial carnallite. It is necessary to purify these brines from sulfates for their further use as raw materials for the artificial carnallite production. In this work, the process of desulfurization of magnesium chloride brines with a solution of calcium chloride is studied. The temperature and the processing time, the magnesium chloride solutions concentration and the consumption of desulfurizing agent (calcium chloride) influence on the degree of magnesium chloride solutions purification from sulfate ions was determined. It has been established that almost all sulfate ions interact with calcium ion in 15 minutes and the desulfurization degree reaches 98,08 %. The increase in duration of the suspension mixing is necessary in order to establish equilibrium in the system and relieve the supersaturation in the solution. It has been shown that with increasing solutions saturation with MgCl2, the degree of the magnesium chloride brines purification from SO4 2– ion increases. Complete precipitation of calcium sulfate requires a certain excess concentration of calcium chloride.
About the Authors
V. V. Shevchuk
Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Viacheslav V. Shevchuk – Corresponding Member, D. Sc. (Chemistry), Head of the Laboratory
9/1, Surganov Str., 220072, Minsk
T. N. Potkina
Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Tatyana N. Potkina – Ph. D. (Chemistry), Leading Researcher
9/1, Surganov Str., 220072, Minsk
A. I. Vaitenka
Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Anatoli I. Vaitenka – Researcher
9/1, Surganov Str., 220072, Minsk
O. V. Smetanina
Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Olga V. Smetanina – Junior Researcher
9/1, Surganov Str., 220072, Minsk
References
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2. State Standard 16109-70.Carnallite enriched. Technical conditions. Moscow, Standartinform Publ., 1999.12 p. (in Russian).
3. Kosvintsev O. K. Development and improvement of technology for processing carnallite ores.Perm, 1998.163 p. (in Rusian).
4. Baygenzhenov O. S. Theoretical substantiation and development of technology for producing synthetic carnallite from chrysolite and titanium-magnesium production wastes. Almaty, 2014. 97 p. (in Russian).
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