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. To reduce toxicity concerns, it is often substituted with strontium carbonate, which behaves in a similar way in glazes but is of lower toxicity. Its use is somewhat controversial since it can leach from glazes into food and drink. 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. Other uses īarium carbonate is widely used in the ceramics industry as an ingredient in glazes. Otherwise it is a common precursor to barium-containing compounds such as ferrites. It is mainly used to remove sulfate impurities from feedstock of the chlor-alkali process. Pyrolysis of barium carbonate gives barium oxide. In the soda ash process, an aqueous solution of barium sulfide is treated with sodium carbonate: BaS + H 2O + CO 2 → BaCO 3 + H 2S Reactions īarium carbonate reacts with acids such as hydrochloric acid to form soluble barium salts, such as barium chloride: Preparation īarium carbonate is made commercially from barium sulfide by treatment with sodium carbonate at 60 to 70 ☌ ( soda ash method) or, more commonly carbon dioxide at 40 to 90 ☌: In a commercial sense, it is one of the most important barium compounds. It occurs as the mineral known as witherite. Like most alkaline earth metal carbonates, it is a white salt that is poorly soluble in water.
Barium sulfate precipitate color series#
The dry brightness of the this Series Barite’s is 80 – 82 minimum.Barium carbonate is the inorganic compound with the formula BaCO 3. Our Chemical Series is a lower color Barite which gives the formulator the same qualities as the Pigment Series Barite’s but the option of using a lower cost Barite in darker color applications. These barites are designed for use in plastics, paints, coating, brake linings and other applications requiring acid resistant, high-density filler. SrSO4, BaSO4are white colour precipitates. All carbonates (CO32-) of alkali earth metal ions are precipitates CaCO3, MgCO3, SrCO3are precipitates and they are white. Like the Blanc Fixe, the Barium Sulfate can contribute to corrosion resistance. Alkaline earth metalsforms both precipitates and solutions. The specific gravity is 4.25, the oil absorption is 10 – 13 depending on the grade, dry brightness is 90 min., and the Mohs’ hardness is 3.0 – 3.5. Our Pigment Series Barium Sulfates are high density, low oil absorption, very white, acid resistant fillers. These fine white barites are natural, select, white, high quality material designed for use in paints and coatings, plastics and other applications requiring a white and/or acid resistant high density filler. Precipitated Barium Sulfate is inert, resistant to light and weathering, and insoluble in water, acids, alkali and organic media.
In coatings, Precipitated Barium Sulfate is recommended in high gloss, acid-resistant formulations. The specific gravity is 4.50, with the general properties of ordinary precipitated barium sulfate. It is the ideal extender of colored systems. It exhibits a continuous, high diffuse reflectance of light, not only in the visible range, but also far into the UV and IR ranges. Precipitated Barium Sulfate has a Mohs hardness of 3 and is very low in abrasion. Precipitated Barium Sulfate is a high brightness, low oil absorption, inert extender that is well suited for a variety of application including powder coatings, thermoplastics, elastomers, fiber, paper, ink and pigment preparations.
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