There are two main production processes for depositing barium sulfate: Glauber's salt method-commonly known as black ash method and sulfuric acid method; the so-called Glauber's salt method is natural barite ore plus coal calcined into barium sulfide, and then reacts with Glauber's salt (sodium sulfate) to form a deposit Barium sulfate and by-product sodium sulfide; the sulfuric acid method converts barium sulfide through carbon dioxide to barium carbonate, and then reacts with pure sulfuric acid to generate deposited barium sulfate. From the above barium sulfate production process, it can be seen that the free barium, odor (remaining sulfide ion), impurities, black spots and whiteness of barium sulfate deposited by sulfuric acid method are several steps higher than that of Glauber's salt method, and the cost is also high. A lot of it, so it is now the more expensive deposited barium sulfate on the market.

The production of barium sulfate produces a large amount of sodium sulfide. With this problem, we have entered the process of efficiently producing deposited barium sulfate, because the sulfuric acid produced by chemical reaction will produce some other by-products in the reaction. Pure sodium sulfide is a colorless crystalline powder. It has strong moisture absorption and is easily soluble in water. The aqueous solution is strongly alkaline. Burns can form when it touches the skin and hair.

Sodium sulfide is commonly known as alkali sulfide. The sodium sulfide aqueous solution will slowly oxidize into sodium thiosulfate, sodium sulfite, sodium sulfate and sodium polysulfide in the air. Since sodium thiosulfate is produced faster, the main product of oxidation is sodium thiosulfate. Sodium sulfide deliquescence in the air, and carbonation and transformation, continuously releasing hydrogen sulfide gas. Industrial sodium sulfide contains impurities, and its color is pink, red, brown, and ocher. Its color is unique to its formation in production and cannot be manipulated by humans. We should use chemical properties to serve us. The application in printing and dyeing, mineral processing, and leather can explain this problem.

Usage 1. Paint grade (TL): Deposition of barium sulfate for paint is used for white body pigments and various water-based, oil-based, resin industrial paints, primers, maintenance paints, etc.

Usage 2. Paper grade (ZZ): Barium sulfate is used as a filler for various types of paper and cardboard, and a wood asphalt control agent.

Usage 3. Plastic grade (SL): used as filler for polypropylene, nylon, polyvinyl chloride, polyethylene, polystyrene, polyester and other plastics.

Usage 4. Rubber grade (AJ): High-gloss barium sulfate is used for rubber fillers and anti-sticking agents for rubber products.

Usage 5. Cable grade (DL): used for cable rubber extender and cable barrier agent.

Usage 6. Ceramic grade (TC): used to make electric porcelain, radio porcelain, various industrial ceramics, architectural ceramics, daily-use ceramics and enamels.

Usage 7. Waterproof material grade (FS): used for waterproofing membrane, waterproof coating, waterproof ointment, etc.

Usage 8. Superfine barium sulfate: used in paint coatings, plastics, cable rubber, cosmetics, copper paper coatings, textile lubricants, etc.

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——Foshan Anyi·Deep cultivator in nanomaterials industry

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