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烟气脱硫副产硫酸镁的体系相平衡研究

Environmental Engineering(2013)

Cited 23|Views5
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Abstract
镁法脱硫技术可回收副产品,且经济效益高,具有良好的应用前景。通过等温溶解平衡法研究了镁法脱硫浆液生产七水硫酸镁过程中,浆液中Ca2+、Cl-等离子对蒸发、结晶的影响,分别绘制了25,35,45,55,65,75,85,95℃下四元交互体系Mg2+、Ca2+、SO2-4、Cl-—H2O的平衡相图。对相图的分析表明:七水硫酸镁结晶的最佳温度应控制在25~30℃;无论何种温度下蒸发都避不开CaSO4(CaSO4·2H2O)固相区,只能在进蒸发系统前降低Ca2+含量以防止换热管的结垢;Cl-的存在对蒸发以及结晶的影响不明显。
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Key words
phase diagram,FGD By magnesium oxide scrubbing,isothermal dissolvel-equilibrium method,Epsom salts
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