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[Chemical Knowledge]：Manufacturing method and process of calcium chloride dihydrate

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The manufacturing method
of calcium chloride dihydrate is
in the field of raw materials for chemical production. Calcium chloride dihydrate is an important inorganic salt compound and has a wide range of uses. This article will introduce the manufacturing method of calcium chloride dihydrate, including raw material preparation, reaction process, post-treatment and packaging steps.

1. Raw Material Preparation

The main raw materials for the manufacture of calcium chloride dihydrate are limestone and hydrochloric acid. Limestone is mainly composed of calcium carbonate, and hydrochloric acid is an aqueous solution of hydrogen chloride gas. Before preparing calcium chloride dihydrate, the quality of the raw materials needs to be inspected to ensure that the purity and impurity content of the raw materials meet the production requirements.

2. reaction process

1. Calcination of limestone: Put limestone in a calciner and calcine it at high temperature to decompose it into calcium oxide and carbon dioxide. It is necessary to control the temperature and time during the calcination process to ensure the complete decomposition of limestone.
2. Acidolysis: Calcined calcium oxide reacts with hydrochloric acid to produce calcium chloride and water. This reaction is an exothermic reaction, and the reaction rate should be controlled to avoid local overheating.
3. Crystallization process: The reaction solution is cooled to a certain temperature to crystallize and precipitate calcium chloride. During the crystallization process, the cooling speed and stirring speed should be controlled to obtain calcium chloride dihydrate crystals with uniform particle size and high purity.

3. Post-Treatment

1. Centrifugation: The crystallized mixture was centrifuged to obtain calcium chloride dihydrate crystals and a mother liquor. Centrifugal separation process should pay attention to control the centrifugal force and separation time, in order to improve the separation efficiency.
2. Washing and drying: The calcium chloride dihydrate crystal is washed with purified water to remove impurities attached to the surface. The crystals are then placed in a drying apparatus and dried at an appropriate temperature to obtain a dried calcium chloride dihydrate product.

4. Packaging and Storage

The dried calcium chloride dihydrate product is packaged, usually in plastic bags or paper bags, and then stacked or stored as needed. During storage, it is necessary to pay attention to moisture, sun and high temperature protection to maintain the stability and quality of the product.

The above is the basic manufacturing method of calcium chloride dihydrate, and the specific production process needs to be adjusted and optimized according to factors such as equipment conditions, production scale and product quality requirements. At the same time, in order to ensure the smooth progress of the production process and the stability of product quality, it is also necessary to carry out regular maintenance and maintenance of the production equipment, comprehensive monitoring and timely adjustment of the production process.

In short, the manufacture of calcium chloride dihydrate requires strict control of each production link to ensure the smooth progress of the steps of raw material quality, reaction conditions, post-processing, packaging and storage, in order to obtain high-quality calcium chloride dihydrate products.

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