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[Chemical Knowledge]：The production and manufacturing method and process of lithopone.

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Lide powder is an important chemical pigment, which is widely used in plastics, paints, printing inks and other fields. It is a mixture of barium sulfate and zinc sulfide, with excellent hiding power, weather resistance and chemical stability. In the field of chemical production raw materials, the main manufacturing methods of lide powder are as follows:

1.
precipitation method is the main method of domestic production of lide powder. In this method, barium sulfate and zinc sulfide are made into solutions respectively, then mixed together, and coprecipitation reaction occurs under stirring conditions to generate lide powder. The specific operation steps are as follows:
Barium sulfate and water are mixed according to a certain proportion to prepare barium sulfate suspension.
(2) The zinc sulfide and water are mixed in a certain proportion to form a zinc sulfide solution.
(3) The barium sulfate suspension and zinc sulfide solution are mixed together, a certain amount of dispersant and precipitant are added, stirred for a certain period of time, and then allowed to settle.
(4) The precipitate is washed, dried and pulverized to obtain a lide powder product. The advantages of

precipitation method are simple process, convenient operation and low production cost, but the product has wide particle size distribution, yellow color and relatively low hiding power.

2. Hydrothermal method
Hydrothermal method is a method of chemical reaction in high temperature and high pressure aqueous solution, which can be used to prepare high-purity, ultrafine powder materials. In the process of preparing lide powder by hydrothermal method, the mixed solution of barium sulfate and zinc sulfide is placed in a high-pressure reaction kettle, and it is reacted by heating and pressurizing to generate lide powder. The specific operation steps are as follows:
(1) mix barium sulfate and zinc sulfide according to a certain proportion, add an appropriate amount of water and dispersant, and prepare a mixed solution.
(2) Pour the mixed solution into a high-pressure reaction kettle, seal it and heat it to a certain temperature in an oven for a certain period of time.
(3) After the reaction is completed, the reaction kettle is cooled to room temperature and opened to remove the product.
(4) The product is washed, dried and pulverized to obtain a lide powder product. The advantages of

hydrothermal method are high product purity, narrow particle size distribution, and white color, but the equipment investment is large and the production cost is high.

3. Microemulsion method
Microemulsion method is a method of preparing nanomaterials, which can be used to prepare high-purity, uniformly dispersed lide powder. In this method, a mixed solution of barium sulfate and zinc sulfide is added to a microemulsion formed by a surfactant, and the reactants are mixed on a nanometer scale by the action of the microemulsion, thereby generating a uniformly dispersed lide powder. The specific operation steps are as follows:
Barium sulfate and zinc sulfide are mixed according to a certain proportion to make a mixed solution.
(2) The surfactant, cosurfactant and water are mixed in a certain proportion to form a microemulsion.
(3) The mixed solution is added to the microemulsion, and after stirring for a certain period of time, it is allowed to fully react.
(4) The reaction product is centrifuged, washed, dried and crushed to obtain a lide powder product. The advantages of

microemulsion method are small particle size, uniform distribution and white color, but the operation is more complicated and the production cost is higher.

To sum up, the main manufacturing methods of lide powder are precipitation method, hydrothermal method and microemulsion method. Different methods have different advantages and disadvantages and scope of application, and the appropriate manufacturing method should be selected according to the specific situation. At the same time, in order to obtain high-quality products, it is necessary to strictly control factors such as the quality of raw materials, reaction conditions and post-treatment processes.

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