Method for producing calcium chloride by utilizing magnesium and magnesium alloy dedusting waste gas

The invention discloses a method for producing calcium chloride by utilizing magnesium and magnesium alloy dust removal waste gas, belongs to the technical field of magnesium and magnesium alloy wastegas reutilization, and can solve the problems of high post-treatment cost and easiness in crystalliz...

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Hauptverfasser: GENG DAPAN, ZHANG QUANFU, SONG LEI, ZHANG ZHIXIN, WANG XIANGYU, REN NAIDONG, WU WEIKANG, ZHANG ZICHENG, WANG JIAN, ZHAO JIANQI, LIU HAIMING, XING BIN, ZHANG HAIJING, GUO YUNYAO, ZHAO SHENGGUO
Format: Patent
Sprache:chi ; eng
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Zusammenfassung:The invention discloses a method for producing calcium chloride by utilizing magnesium and magnesium alloy dust removal waste gas, belongs to the technical field of magnesium and magnesium alloy wastegas reutilization, and can solve the problems of high post-treatment cost and easiness in crystallization of sodium hydroxide or liquid caustic soda for neutralization of the existing magnesium and magnesium alloy dust removal waste gas. The absorption tower is additionally arranged at the tail end of the magnesium and magnesium alloy waste gas to fully absorb acid; acid liquor circularly entersan external reaction box, excessive limestone is added into the box, and a sufficient reaction is conducted; the pH value is adjusted through a pH adjusting tank; after the reaction is finished, solid-liquid separation is carried out in a concentrated solution through a filter press; and evaporating and salting-out is carried out on the separated clarified liquid to obtain calcium chloride crystals. Waste gas and waste liq