Effect of Different Surfactants on Crystal Morphology of Calcium Sulfate α-hemihydrate
The preparation of calcium sulfate hemihydrate from ammonia waste is an effective and high valuable way to use waste liquid produced from the soda ash by ammonia-alkali process.However,since the size and morphology of calcium sulfate crystals are difficult to control.Calcium chloride and sodium sulfate were used as raw materials,atmospheric acidification method was adopted,and the reaction temperature was 95 ℃,the reaction time was 1 h,the solution pH value was 2,and the aging time was 2 h.The effects of three surfactants(sodium dodecyl benzene sulfonate,sodium tripolyphosphate and citric acid)on the crystal morphology of α-calcium sulfate hemihydrate crystals were studied.It was found that the three surfactants can reduce the particle size of α-hemihydrate calcium sulfate crystals,and sodium tripolyphosphate had the greatest effect on the morphology of α-hemihydrate calcium sulfate crystals.This study can provide basic research data for the preparation of calcium sulfate hemihydrate by the reaction of ammonia waste liquid and glauthenite and its morphology control.
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