Main applications of barium carbonate_Industrial additives

The main application background and overview of barium carbonate

Chemical formula BaCO₃, white orthorhombic crystal, toxic! The relative density is 4.43, the melting point is 1740℃ (90×105Pa), and it decomposes and loses carbon dioxide at 1450℃. Insoluble in cold water and boiling water, slightly soluble in water containing carbon dioxide. Soluble in acid and ammonium chloride, insoluble in alcohol. It occurs in nature in the form of poisonite. Barium carbonate can be used in the manufacture of barium salts, ceramics, paints, optical glass, pigments, rubber, rodenticides and the paper industry. It can be obtained by passing carbon dioxide into barium sulfide solution or barium hydroxide solution, or by the interaction of sodium carbonate and barium nitrate. Industrially, it is prepared by boiling barium sulfate in sodium carbonate solution.

Main applications of barium carbonate

Barium carbonate is mainly used in the manufacture of barium salts, pigments, fireworks, optical glass, ceramics, enamel, and as water purifiers and rodenticides. Also used in steel and metal surface treatment and the electronics industry. Examples of its application are as follows:

1) Use barium carbonate to remove sulfate radicals in brine. It is mainly used to remove sulfate radicals in brine refining in the chlor-alkali industry. It is the most economical method of removing sulfate radicals in brine. The technical key points are: add barium carbonate into a mixing tank containing salt water with a concentration of 150~250g/l, and after stirring evenly, add the suspension into a reaction tank containing a certain amount of sulfate radicals for reaction. The final mixed liquid is added to the clarification tank with a pump for separation. After clarification and separation, the unreacted barium carbonate is present in the lower part of the clarification tank and is pumped back to the reaction tank. The clear liquid with sulfate removed is present in the upper part of the clarification tank and is pumped into the reaction tank. Next process. The main advantages of the present invention are: due to repeated reactions, the reaction rate of barium carbonate is high; compared with the barium chloride method for removing sulfate radicals, the cost is lower and the safety is higher; a certain amount of sodium carbonate can be produced, and the refined preparation (sodium carbonate) can be reduced consumption and save the purchase cost of sodium carbonate. In addition, since barium carbonate, which is cheaper than barium chloride, is used to remove sulfate radicals, the cost of removing sulfate radicals in the brine is lower.

2) Synthesize barium manganese carbonate single crystal, use analytically pure barium carbonate and analytically pure manganese carbonate to grind and mix evenly at a molar ratio of 1:1 as starting materials, pass through 700~900℃, pressure 1~3GPa, react The barium manganese carbonate powder crystal sample obtained by the high-temperature and high-pressure reaction for 12 hours was ground and mixed with the barium manganese carbonate powder crystal sample and anhydrous oxalic acid at a molar ratio of 1:0.1 to prepare the sample, and then the reaction was carried out at 700~900°C and a pressure of 3GPa. A barium manganese carbonate single crystal sample was obtained through a 100-hour high-temperature and high-pressure reaction. The high-temperature and high-pressure method has the advantages of simple operation process and easy control of experimental conditions. The obtained barium manganese carbonate sample has high purity, good crystallinity, and good chemical stability. It has the characteristics of not easily absorbing water and solves the current technical problems of artificial synthesis of barium manganese carbonate and lack of single crystal growth methods.

3) Used to prepare a solid carbonate electrode based on barium carbonate and strontium carbonate. It includes a wire, barium carbonate or strontium carbonate, a protective film, and a heat shrink tube; the lower surface of the wire is electroplated with a layer of barium carbonate or strontium carbonate in situ, and the outer surface of the barium carbonate or strontium carbonate is covered with a protective film. And the upper part of the protective film is covered with heat shrink tube. The wire is a silver wire with a diameter of 0.2 to 0.6 mm. The invention has the advantages of high mechanical strength, great toughness, high sensitivity, small size, fast detection response, extremely low detection limit, long service life, etc. It is used in conjunction with a solid reference electrode and is suitable for detecting seawater, aquaculture water and chemical, Online detection and long-term in-situ monitoring of carbonate ion content in chemical water media.

4) A method of using barium carbonate to prepare nano-barium sulfate to co-produce carbonic acid; the main technical solution is: barium carbonate reacts with sulfuric acid to generate a mixed liquid, which is then centrifuged, and the filter cake is washed, dried and pulverized to obtain nano-barium sulfate , the filtrate carbonic acid is distilled under reduced pressure to obtain a carbonic acid product. The production process and equipment of the present invention are simple and the cost is low. It can not only prepare the target product nano-barium sulfate, but also co-produce carbonic acid products, which can create high economic value.

The main application preparation of barium carbonate

Method 1: Barium carbonate can be produced by reduction roasting of barite and coal powder and then carbonization. Its reaction formula is as follows for benzylpyridine:

Method 2: A method for producing high-purity electronic grade barium carbonate, which is characterized by including the following steps: ① Add barium hydroxide to deionized water, and the weight ratio of barium hydroxide polycarbonate to deionized water It is 1:3~25, heat and stir to dissolve, the temperature rises to 30~80℃, and configure it into a barium hydroxide solution; ② Add an organic dispersant to the barium hydroxide solution prepared in step ①, and stir under the conditions of 30~80℃ Stir at a constant temperature for 10 to 60 minutes. The amount of organic dispersant is 1.0‰ to 5.0‰ of the volume of the barium hydroxide solution; ③ Add the organic dispersant to the barium hydroxide solution with the organic dispersant described in step ② through the aeration device under stirring. Pass in carbon dioxide. The weight ratio of barium hydroxide to carbon dioxide is 1:0.3~0.5. After the aeration is completed, stop stirring; then pass in carbon dioxide. When the pH=6~7, stop aeration to obtain a barium carbonate solution; ④ Step ③ The prepared barium carbonate solution is heated to fully react; it is then precipitated and filtered to obtain barium carbonate precipitate; ⑤ dry the barium carbonate precipitate in step ④ in a desiccator to obtain high-purity electronic grade barium carbonate.