Place of Origin:
Barium carbonate (BaCO3), also known as witherite, is a chemical compound used in rat poison, bricks,
ceramic glazes and cement.
The mineral is named after William Withering, who in 1784 recognized it to be chemically distinct from
barytes. It occurs in veins of lead ore at Hexham in Northumberland, Alston in Cumbria, Anglezarke, near
Chorley in Lancashire and a few other localities. Witherite is readily altered to barium sulfate by the action
of water containing calcium sulfate in solution and crystals are therefore frequently encrusted with barytes.
It is the chief source of barium salts and is mined in considerable amounts in Northumberland. It is used for
the preparation of rat poison, in the manufacture of glass and porcelain, and formerly for refining sugar.It is
also used for controlling the chromate to sulfate ratio in chromium electroplating baths.
|Item||Specification for Frist Grade|
|HCL insoluble Matter||≤0.25%|
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Barium carbonate is widely used in the ceramics industry as an ingredient in glazes.
It acts as a flux, a matting and crystallizing agent and combines with certain colouring
oxides to produce unique colours not easily attainable by other means.
Its use is somewhat controversial since some claim that it can leach from glazes into
food and drink.
To provide a safe means of use, BaO is often used in fritted form.
In the brick, tile, earthenware and pottery industries barium carbonate is added to
clays to precipitate soluble salts (calcium sulfate and magnesium sulfate) that cause efflorescence.
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