Inorganic Chemicals Industry >
Study on preparation of hemihydrate calcium sulfate whisker from dense brine
Received date: 2019-10-28
Online published: 2020-04-22
Calcium sulfate hemihydrate whisker with high length/diameterm（L/D） ratio was prepared from high concentration brine abandoned in the production process of sea salt industry.The effects of material concentration,crystal growth promoter concentration,reaction time,reaction temperature and reaction stirring rate on the preparation of calcium sulfate hemihydrate whisker were investigated.The prepared calcium sulfate hemihydrate whisker was characterized and confirmed by powder X-ray diffractometer and scanning electron microscope.Through the orthogonal experimental,the optimum conditions were con-firmed as follows：material mass fraction of 3%,crystal growth aid mass fraction of 3%,reaction time of 7 h,reaction tempera-ture of 130 ℃ and reaction stirring rate of 30 r/min.Under this condition,calcium sulfate hemihydrate whiskers with the L/D ratio of 400 were produced.The technology has the advantages of low production cost,environment friendly and stablity.The prepared calcium sulfate hemihydrate whisker with average L/D ratio of 400 is easy to produce industrially.
Na Tang , Yunhao Hei , Tengfei Wu , Jun Xiang , Wei Du , Lei Zhang . Study on preparation of hemihydrate calcium sulfate whisker from dense brine[J]. Inorganic Chemicals Industry, 2020 , 52(4) : 88 -92 . DOI: 10.11962/1006-4990.2019-0312
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