How is calcium hydroxide used to neutralize waste acid to produce calcium sulfate dihydrate?
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When 1 MOL/L of waste acid is neutralized with lime or limestone, the product formed is anhydrous calcium sulfate, with only about 2% calcium sulfate dihydrate present. What kind of process conditions are needed in order to obtain more than 90% calcium sulfate dihydrate?
Let’s see if this article is useful: \"Crystallization Conditions and Techniques for Calcium Sulfate Dihydrate\" http://wenku.baidu.com/link?url=p4NDQN5DWhCoFaVYOWXfXq5VCeT8oeX-r5Y_2kDed_CiFQ4uu_ztr9VuqvplmU87RjPMULVztdiSByJ2MOKhvh3drfu_8oGeOxyxRBJQhzK
That article was about phosphate production, which is very different from what I do. In my case, it involves treating waste acid water generated during production; the sulfuric acid concentration is between 3% and 8%, and at room temperature, lime, limestone, or slaked lime is added to neutralize it. However, the product of this neutralization process is anhydrous calcium sulfate, and what’s needed is calcium sulfate dihydrate
Calcium sulfate dihydrate is obtained by the direct reaction of 90 acid with calcium carbonate. That’s exactly how our company produces it. Do you need calcium sulfate dihydrate? We have plenty of it here; it’s usually used for land reclamation and similar purposes. For contact, use the number 545443765 – we can discuss this further