Yuan Lei's Little Knowledge | Take You to Understand Precipitated Barium Sulfate
Precipitated barium sulfate is a white precipitate generated by the reaction of barium ions and sulfate ions in solution. It is stable in nature and almost insoluble in water, ethanol and acid, but soluble in hot sulfuric acid. It has the advantages of strong chemical inertness, good stability, acid and alkali resistance, moderate hardness, high specific gravity and good whiteness.
The precipitated barium sulfate is a white amorphous powder with a relative density of 4.50(15 ℃) and a melting point of 1 580 ℃. Due to the high refractive index (1.63~1.65), the color is white and has a certain hiding power. It is almost insoluble in water, ethanol and acid, soluble in hot sulfuric acid. It is easy to make mixed crystal with potassium permanganate, calcium carbonate or metal nitrate. It can be reduced to barium sulfide with carbon at high temperature. It is an important basic chemical raw material, the main purpose: used as paint, coating, ink, plastic, rubber and battery raw material or filler; printing paper and copper plate paper surface coating agent; textile industry with sizing agent; glass products as a clarifying agent, can play the role of defoaming and increase gloss. It can also be used as a protective wall material for radiation protection, and is also used in porcelain, enamel and dye industries. It is also a raw material for manufacturing other barium salts.
Widely used in various coatings, plastics, rubber, paint, ink, insulating tape, ceramics, batteries, enamel and other industries. Can be used for acid-resistant rubber products and general products. It can also be used as a surface coating agent, sizing agent, weighting agent, clarifying agent, etc. It is the raw material for manufacturing other barium salts-powder coating, paint, marine primer, ordnance equipment paint, automobile paint, latex paint, interior and exterior wall architectural coating, which can improve the product light resistance, weather resistance, chemical and electrochemical corrosion resistance and product decoration effect, and enhance the impact strength of the coating. The inorganic industry is used as a raw material for the manufacture of other barium salts such as barium hydroxide, barium carbonate, barium chloride, etc. The wood industry produces wood-grain printing plates for primting and modulating printing paints. In organic synthesis, it is used as green pigment and lake to produce body filler.
Printing: ink filler, can play the role of aging resistance, exposure, increase adhesion, clear color, bright, do not fade.
Filler: tire rubber, insulating rubber, rubber sheet, adhesive tape, engineering plastics can enhance the anti-aging performance and weather resistance of the product, the product is not easy to age and become brittle, and can significantly improve the surface finish, reduce the production cost, as the main filler of powder coating, is the main means to adjust the powder bulk density to improve the powder rate.
Functional materials: papermaking materials (mainly paste products), flame retardant materials, anti-X-ray materials, battery cathode materials, etc. All of them can show unique properties and are an indispensable part of related materials.
Other areas: ceramics, glass raw materials, special resin materials, special particle size distribution of precipitated barium sulfate and titanium dioxide compound, titanium dioxide has a synergistic effect, thereby reducing the amount of titanium dioxide.
How to produce precipitated barium sulfate and barium ions will generate barium carbonate precipitation, there is a balance of barium ions and carbonate in water, if there is barium sulfate precipitation in water, there will also be a balance of sulfate and barium ions. The two equilibria interact, although barium sulfate is less soluble than barium carbonate.
However, due to the precipitation of barium carbonate generated by carbonate and barium ions, the equilibrium of precipitation and dissolution of barium sulfate will move and part of barium sulfate will be re-dissolved in water, thus the sulfate cannot be removed completely. Therefore, the barium sulfate must be filtered out before sodium carbonate can be added. The barium sulfide solution is mixed with the mirabilite solution after calcium and magnesium removal, and the reaction is carried out at 80 ℃ to generate precipitate, after suction filtration, water washing and acid washing, the pH value is adjusted to 5-6, then filtered, dried and crushed. Barium yellow brine can also be used to react with Glauber's salt solution to prepare precipitated barium sulfate.
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The difference between barium sulfate（BaSO4） and barium sulfite（BaSO3）
Kaolin is a non-metallic mineral, which is a kind of clay and clay rock mainly composed of kaolinite clay minerals. Because it is white and delicate, also known as white earth. It is named after Gaoling Village, Jingdezhen, Jiangxi Province.