磷石膏热分解制备二氧化硫和氧化钙研究

Abstract

Abstract: The reaction characteristics of the thermal decomposition of phosphogypsum with coal as reducing agent to prepare CaO and SO₂ were investigated in N₂ atmosphere.The output gas and the solid decomposition products were analyzed by gas analyzer and XRD，respectively.The influences of particle size of coal，mix ratio of raw materials，and reaction temperature on the thermal decomposition of phosphogypsum were studied.The results showed that the optimum conditions to produce SO₂ and CaO were：the coal particle size was less than 150 μm，the amount-of-substance ratio of C to CaSO₄ was 0.8，and the decomposition temperature was 1 000 ℃.Under optimum conditions，the maximum SO₂ volume fraction of the decomposition gas was 12.5%，and the CaO mass fraction of the solid product was 65.32%，which can be used as a raw material of cement or a CO₂sorbent.

Key words: phosphogypsum, thermal decomposition, sulfur dioxide, calcium oxide

CLC Number:

TQ125.14

ZHENG Shao-Cong, NING Ping, WANG Fan, CHENG Fei-Xiang, HU Fen-E. Study on preparation of sulfur dioxide and lime by thermal decomposition of phosphogypsum[J]. INORGANICCHEMICALSINDUSTRY, 2013, 45(9): 45-.

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Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation of sulfur dioxide and lime by thermal decomposition of phosphogypsum

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