How calcium chloride manufacturers produce calcium chloride
A large number of crystalline calcium chloride products on the market are flakes, that is, flaky calcium chloride.
As an inorganic salt, calcium chloride is divided into powder, flake and granular calcium chloride. Calcium chloride is widely used in antifreeze, fire protection, textile, agricultural fertilizer and other industries. The production process of flaky calcium chloride is to put hydrochloric acid (31%) and limestone powder into a reaction tank in the proportion of 2,333,601, stir and react to generate acid calcium chloride solution, and then move it into lime milk for adjustment. pH of the solution. To 8.9~9, ferric hydroxide and magnesium hydroxide are precipitated again. After clarification and filtration, the filtrate was transferred to an evaporating dish, heated to 172-174°C to evaporate, crystallized, separated, dried and dehydrated at 200-240°C to obtain calcium chloride dihydrate.
The specific operation process is as follows: 1. Soda ash waste liquid recovery method: The soda ash waste liquid recovery method uses ammonia water and distillation waste liquid in soda water production as raw materials, but it needs to be purified, clarified, evaporated and other processes before use. Become pelleted and centrifuged. The mother liquor separated from the sodium chloride is separated, sent to the evaporator to continue to evaporate and concentrate, so that the calcium chloride content reaches about 70%, and then poured into a packaging barrel for condensation to obtain flaky calcium chloride.
This method is mainly used in industrial production. Hydrochloric acid limestone powder method: The hydrochloric acid limestone powder method is used to add hydrochloric acid and limestone powder into the reactor at a ratio of 2.2:1, stir to make an acid calcium chloride solution, and send it to the clarification tank under stirring, and then add lime milk to adjust the solution. The pH is between 8.5-9, which means precipitation, then impurities are removed. The purified neutral calcium chloride solution is preheated to 172-174, and the crystals obtained after cooling are flaky calcium chloride, which are rarely used.
