Manufacturing Method of Calcium Chloride Dihydrate
In the field of raw materials for chemical production, calcium chloride dihydrate is an important inorganic salt compound with a wide range of uses. This article will introduce the manufacturing method of calcium chloride dihydrate, including the steps of raw material preparation, reaction process, post-treatment and packaging.
I. Raw material preparation
The main raw materials for manufacturing calcium chloride dihydrate are limestone and hydrochloric acid. The main component of limestone is calcium carbonate, and hydrochloric acid is an aqueous solution of hydrogen chloride gas. Before preparing calcium chloride dihydrate, it is necessary to carry out quality inspection of raw materials to ensure that the purity and impurity content of raw materials meet the production requirements.
II. Reaction process
1. Calcination of limestone: Limestone is put into the calcining furnace and calcined at high temperature to decompose it into calcium oxide and carbon dioxide. The calcination process needs to pay attention to control the temperature and time to ensure the complete decomposition of limestone.
2. Acid digestion reaction: Calcined calcium oxide is reacted with hydrochloric acid to produce calcium chloride and water. This reaction is exothermic, and it is necessary to control the reaction speed to avoid local overheating.
3. Crystallization process: cool the reaction liquid to a certain temperature, so that the calcium chloride crystals precipitated. During the crystallization process, it is necessary to control the cooling speed and stirring speed to obtain calcium chloride dihydrate crystals with uniform particle size and high purity. III. Post-treatment
1. Centrifugal separation: centrifugal separation of the mixture after crystallization to obtain calcium chloride dihydrate crystals and mother liquor. In the process of centrifugal separation, it is necessary to pay attention to the control of centrifugal force and separation time in order to improve the separation efficiency. Washing and drying: Wash the calcium chloride dihydrate crystals with pure water to remove the impurities attached on the surface. Then place the crystals in drying equipment and dry them under appropriate temperature to get dry calcium chloride dihydrate product. Packing and storage
The dried calcium chloride dihydrate products are packed, usually in plastic bags or paper bags, and then stacked or stored according to the need. In the storage process, attention needs to be paid to moisture-proof, sun-proof and high temperature-proof to maintain the stability and quality of the product.
Above is the basic manufacturing method of calcium chloride dihydrate, the specific production process also needs to be adjusted and optimized according to the equipment conditions, production scale and product quality requirements and other factors. 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 repair of production equipment, comprehensive monitoring of the production process and timely adjustment.
In short, the manufacture of calcium chloride dihydrate requires strict control of each production link to ensure the smooth running of the steps of raw material quality, reaction conditions, post-processing and packaging and storage, in order to obtain high-quality calcium chloride dihydrate products.
