Method for preparing hydroxyl iron oxide and semi-hydrated gypsum from acid metallurgical wastewater

The present invention discloses a method for preparing hydroxyl iron oxide and semi-hydrated gypsum from acid metallurgical wastewater. According to the method, a bottom liquid having a small amount of hydroxyl iron oxide and semi-hydrated gypsum crystal seed is reserved in a reactor, acid metallurg...

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Bibliographische Detailangaben
Hauptverfasser:	LIN GUOQIN, HUANG HUAIGUO, LIN HAIBIN, XIONG MING, YE ZHIYONG, LIN HONGHAN, CAI CHUANGKAI, JI CHANGQING
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS INORGANIC CHEMISTRY METALLURGY
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Beschreibung
Zusammenfassung:	The present invention discloses a method for preparing hydroxyl iron oxide and semi-hydrated gypsum from acid metallurgical wastewater. According to the method, a bottom liquid having a small amount of hydroxyl iron oxide and semi-hydrated gypsum crystal seed is reserved in a reactor, acid metallurgical wastewater is ejected into the reactor, complete aeration is performed, a limestone slurry is added, the reaction conditions are controlled to produce hydroxyl iron oxide and semi-hydrated gypsum, and then separation is performed by using a Knelson re-selection machine to obtain the products. According to the present invention, the method has characteristics of wide raw material source, high conversion rate, high product purity, low production cost, metallurgical wastewater treatment achieving and economic value product recovery, and the technical guide of environmental protection and resource comprehensive recycling is met.