用天然石膏制备硫酸铵和氯化钙的工艺研究

INORGANICCHEMICALSINDUSTRY ›› 2011, Vol. 43 ›› Issue (1): 40-42.

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Production process of ammonium sulphate and calcium chloride from natural gypsum

YANG Rong-Hua- , Gao-De-Li

(School of Chemistry ＆ Chemical Engineering,Taishan Medical College,Taian 271016,China)

Online:2011-01-10 Published:2011-03-17

Abstract

Abstract: Ammonium sulphate and by-product crude calcium carbonate were prepared by double decomposition reaction with natural gypsum and ammonium bicarbonate as raw materials.Influences of the factors,such as reaction temperature,reaction time,mix ratio,and liquid-solid ratio,on conversion rate of calcium sulphate were discussed,and the optimum technological conditions of double decomposition reaction were determined by orthogonal experiment.Recycling method of by-product calcium carbonate was discussed.Calcium chloride can be obtained by the reaction of hydrochloric acid and crude calcium carbonate,meanwhile the technological conditions of this reaction were also determined.Total production process had no waste residue discharge and the process was simple and clean.Through this method,natural gypsum can be converted to ammonium sulfate and calcium chloride with higher value,the quality of the obtained products reach the corresponding chemical standards and the application prospect of the products is much wide. 

YANG Rong-Hua- , Gao-De-Li. Production process of ammonium sulphate and calcium chloride from natural gypsum[J]. INORGANICCHEMICALSINDUSTRY, 2011, 43(1): 40-42.

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Inorganic Acid-Base-Salt Committee of CIESC

Production process of ammonium sulphate and calcium chloride from natural gypsum

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