barium sulfate manufacturer

Precipitated barium sulfate plays a crucial role in the industrial field. In the paint industry, it is an important filler that can improve the light resistance, weather resistance, and chemical and electrochemical corrosion resistance of products and enhance the impact strength of coatings. For example, in thermosetting powder coatings, precipitated barium sulfate can give the coating good decorative, anti-corrosion, and mechanical properties. Barium sulfate precipitation can also be used as a reinforcing agent to improve the rigidity of plastic products, with excellent dispersibility, which can make the modified plastics have extremely high glossiness and flowability. In addition, precipitated barium sulfate is widely used in fields such as ink, papermaking, glass, ceramics, cosmetics, etc. In short, the application of precipitated barium sulfate in the industrial field is very extensive, and its important position cannot be ignored. There are currently two main Industrial Production Methods of Prepared Barium Sulfate: Glauber's salt sodium sulfate method and barium carbonate sulfuric acid method.

Traditional method: Glauber's salt sodium sulfate method

step

Mixing barite and coal powder for high-temperature reduction reaction to produce barium sulfide clinker; Soak and settle the barium sulfide clinker to obtain a certain concentration of barium sulfide solution; Simultaneously prepare a solution of saltpeter and remove calcium and magnesium impurities; Put the two solutions in proportion into a mixing tank for reaction, and perform solid-liquid separation after the reaction is complete; The filtered barium cake is subjected to water washing, acid washing, pH adjustment, pressure filtration, drying, crushing, and other operations to obtain the final product of precipitated barium sulfate. The reaction equation is: BaSO4+4C → BaS+4CO, BaS+NaSO4 → BaSO4+NaS

There are some obvious drawbacks. Firstly, the process of mixing raw materials into the final product requires multiple steps, and the operation is relatively complex. Secondly, this method generates a by-product of sodium sulfide during the production process. Sodium sulfide is widely used in industries such as pharmaceuticals, papermaking, and leather making, but it also causes certain environmental pollution. Thirdly, due to the instability of barium sulfide in the air, it is easy to generate polysulfide barium, resulting in high impurity content and limited whiteness and glossiness in the precipitated barium sulfate. After mechanical crushing and grinding, the particle size distribution of the product is relatively wide, with varying sizes. The scraper fineness is large and the dispersion is poor, causing scattering of light and resulting in a dull and low gloss coating. This limits its use in high-end paints and coatings and can only meet general coating quality requirements.

Innovative choice: Barium carbonate sulfuric acid method

step

Mix industrial barium carbonate with water and slowly add it to a certain amount of sulfuric acid solution while continuously stirring. During the feeding process, it is necessary to observe at all times to prevent tank overflow. After adding the ingredients, continue stirring to allow the barium carbonate to react fully. Then filter, wash with water, dry, and package into the product. The reaction equation is BaCO3+H2SO4→BaSO4↓+H2O+CO2↑

It has many significant advantages. Firstly, compared to Glauber's salt sodium sulfate method, this method does not produce harmful toxic gases or water-soluble salt by-products during the production process. Secondly, due to the reduction of impurities introduced during the reaction process, the resulting precipitate of barium sulfate has a low impurity content and a higher mass fraction of barium sulfate, usually reaching over 98%. Furthermore, a large number of carbon dioxide bubbles are generated during the reaction process, causing the liquid and solid phase reactions to aggregate on the surface of the bubbles with a large specific surface area. The resulting solid barium sulfate particles are small and have a narrow particle size distribution. At the same time, the whiteness of the product can usually reach 98 or above, far higher than that of products produced by the saltpeter sodium sulfate method.

Yunfu Hongzhi New Materials Co., Ltd. (Ambition®) adopts this innovative barium carbonate sulfuric acid method to provide high-quality precipitated barium sulfate to the market. The average particle size of precipitated barium sulfate can be controlled between 30 nanometers and 10 microns. The product also has the advantages of controllable particle size, controllable morphology, high whiteness, blue phase, no sulfide, no black impurities and excellent dispersibility, which can meet the application needs of different industries.