What are the properties of barium carbonate

the physical and chemical properties: barium carbonate properties: industrial products of white powder, melting point: 1740 ℃, the relative density: 4. 43, solubility: almost insoluble in water, insoluble in alcohol, soluble in acid and ammonium chloride solution, structure: a & alpha; 、β 伽马; Three kinds of crystalline state. α - Melting point 1740 ℃, 90. 9× 103Pa) When, 928 ℃ & beta; - Type into & alpha; - Type, 811 ℃ & gamma; - Type into & beta; - Type. Chemical reaction: 1450 ℃ when the decomposition and barium oxide and carbon dioxide. When acid decomposition, barium sulfate and sulfuric acid to generate white precipitate. Micro has the water absorbability. Poisonous. Description:

nature barium carbonate is also called witherite, hereinafter referred to as carbon barium ore. Is another containing barium except barite mineral. With barium oxide 77. 7%, often containing a small amount of strontium and calcium. Orthorhombic system, crystal often double cone shaped and short columnar and plate; Collection is granular, globular, reniform, etc. Colorless, white, often impurities dyed light grey, yellow, green, brown wait for color. Glass luster. Common in low temperature hydrothermal deposit, the symbiosis with barite, calcite, dolomite, etc. Used for oil and gas drilling mud weighting agent, is a manufacturer of all kinds of barium compounds mineral raw materials. For making pigment, fireworks, optical glass, antu, pottery and porcelain. Also can be used as a filler and water clarifying agent, etc. Preparation methods:

can be made of carbon dioxide is bubbled into barium sulphide solution or barium hydroxide solution, or made by sodium carbonate to the role of barium nitrate.

the purpose: used in the production of kinescope glass shell, electronic ceramics and purifying water, the production of paints, coatings, or other barium barium salt used in making optical glass, magnetic materials, such as the production of kinescope glass shell, magnetic materials and advanced optical glass of important chemical raw materials. Used for fireworks, the configuration of the flares, also used in ceramic coating and optical glass materials used in electronic ceramics, PTC thermistor, capacitors and other electronic components manufacturing is mainly used in the manufacture of optical glass, barium kinescope glass and magnetic materials and condenser, etc. , also used for carburizing steel and metal surface treatment.