Research on the process of preparing dihydrate gypsum by crystal transformation of hemihydrate gypsum with solid-phase method
An experimental study is conducted on the process of preparing dihydrate gypsum from hemihydrate gypsum through crystal transformation,the changes of water-soluble P2O5 content,water-soluble F content,crystallization water content,and consumption of crystal transformation agents during the crystal transformation process are explored.The experimental results show that adding quick lime can accelerate the crystal transformation of hemihydrate gypsum,and the actual crystal transformation time can be controlled within 5-7 days;During the crystal transformation process of hemihydrate gypsum,the content of water-soluble P2O5 and water-soluble F are reduced to below 0.1%,avoiding their impact on the quality of downstream cement retarders;The amount of quick lime is adjusted according to the water-soluble P2O5 in gypsum,which is generally controlled at 1%-2%.
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