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A number of uses of barium compounds depend on the ready formation of the highly insoluble sulfate. Thus the compound barium carbonate (BaCO3), perhaps the most important barium compound, is employed in removing sulfate from salt brines before they are fed into electrolytic cells (for the production of chlorine and alkali).

Carbonate in iron and steel induction of moisture toxic. Of barium salts optical glass paints ceramic. Enamel oil paints rubber. Pigment welding rod fireworks used in electronic industry as purifying agent of water and pesticide rat, etc.