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Treatment of the brine with barium carbonate removes sulphates as insoluble barium sulphate and calcium and magnesium salts as their insoluble carbonates. in the manufacture of the other barium compounds such as barium chloride, barium nitrate and barium sulphate.
Barium carbonate is made commercially from barium sulfide either by treatment with sodium carbonate at 60 to 70 ° c (soda ash method) or by passing carbon dioxide at 40 to 90 ° c. in the soda ash process, solid or dissolved sodium carbonate is added to barium sulfide solution, and the barium carbonate precipitate is filtered, washed and dried.

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