Calcium chloride is a chemical consisting of chlorine and calcium with the formula CaCl2, slightly bitter. It is a typical ionic halide, white at room temperature, hard fragments or granules. Common applications include brine for processing equipment, road deicing agents and drying agents.
Preparation methods of calcium chloride are as follows:
1. Calcium chloride dihydrate (dewatering method) method:
Edible calcium chloride dihydrate was dried and dehydrated at 200~300℃ to prepare edible anhydrous calcium chloride product.
For neutral calcium chloride solution, spray drying tower can be used to spray dry and dehydrate at 300℃ hot gas flow to prepare anhydrous calcium chloride powder finished product.
2. Spray drying and dewatering method: the refined neutral calcium chloride solution that has removed arsenic and heavy metals is sprayed into a mist from the top of the spray drying tower through the nozzle, and the countercurrent contact with the hot air flow at 300 ° C is made to dry and dehydrate, and the powdered anhydrous calcium chloride is obtained, and the edible anhydrous calcium chloride is prepared.
3. Mother liquor method:
An aqueous solution is obtained by adding lime milk to the mother liquor of soda ash by ammonia alkali process, which is evaporated, concentrated, cooled and solidified.
The mother liquor when soda ash is produced by ammonia-alkali method, adding lime milk to obtain an aqueous solution, which is formed by evaporation, concentration, cooling and curing.
4. Compound decomposition method:
It is produced by the interaction of calcium carbonate (limestone) with hydrochloric acid.
Chemical reaction equation: CaCO3+2HCI=CaCl2+H2O+CO2↑. After the above steps are completed, it is heated to 260 degrees Celsius and evaporated and dehydrated.
5. Refining method:
It’s refined from the by-product of the production of sodium hypochlorite.
It’s refined from a by-product of the Solvay process for preparing sodium carbonate.
Ca(OH)2+ 2NH4C1 →CaCl2+2NH3+2H2O
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Post time: Nov-03-2023