工业废渣磷石膏水热合成硫酸钙晶须的研究

Abstract

Abstract: Hydrothermal process was applied in the preparation of calcium sulfate whisker with phosphogypsum as the main raw material.The parameters in the preparation of calcium sulfate whisker were optimized by orthogonal design.Effects of reaction time，reaction temperature，and the quantity of crystal seed and crystal promoter on the preparation of calcium sulfate whisker were investigated.Results showed that the optimum conditions of preparation were as follows: the raw material particle size was less than 175 μm，the initial pH of slurry was 4，the reaction temperature was 130 ℃，the reaction time was 4 h，and the amounts of crystal seed and crystal promoter were 10% and 30% of the quantity of phosphogypsum，respectively.The aspect ratios of calcium sulfate whisker at 70~100 were obtained under those conditions.The results of XRD and TG analysis showed that the product was semihydrate calcium sulfate whisker.

Key words: hydrothermal process, phosphogypsum, calcium sulfate whisker, crystal seed, crystal promoter

CLC Number:

TQ132.32

YANG Li-Ping, SHI Wen-Jian, QIN Jun, XIE Zhan-Jin. Study on preparation of calcium sulfate whisker with industrial waste residue phosphogypsum by hydrothermal process[J]. INORGANICCHEMICALSINDUSTRY, 2013, 45(4): 49-.

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National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation of calcium sulfate whisker with industrial waste residue phosphogypsum by hydrothermal process

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