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Effective enrichment of Zn from smelting wastewater via an integrated Fe coagulation and hematite precipitation method

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Frontiers of Environmental Science & Engineering 2019年第6期13卷 147-155页

作者： Zhan Qu Ting Su Yu Chen Xue Lin Yang Yu Suiyi Zhu Xinfeng Xie Mingxin Huo Science and Technology Innovation Centre for Municipal wastewater Treatment and Water Quality Protection Northeast Normal UniversityChangchun 130117China Jilin Institute of Forestry Survey and Design Changchun 130022China Guangdong Shouhui Lantian Engineering and Technology Co.Ltd. Guangzhou 510075China Michigan Technological University School of Forest Resources and Environmental ScienceHoughtonMI 49932USA

Coagulation is commonly applied to treat Zn-bearing wastewater from smelting industries(smelting wastewater),and thus the Zn-bearing sludge was considerably produced,which should be solidified before safety ***,we demonstrated a novel approach to recycle Zn effectively from smelting wastewater via an integrated Fe coagulation and hematite precipitation ***,smelting wastewater was coagulated by adding ferric chloride to generate Fe/Zn-bearing sludge(sludge for short).Secondly,the sludge was dissolved to generate an acid solution containing 2.2 g/L of Zn and 39.2 g/L of ***,the Fe/Zn-bearing solution was hydrothermally treated,and 89%of Fe was eliminated to highly purified hematite block,whereas the percentage of Zn lost was below 1.1%.Finally,the hematite precipitates were collected,and the supernatant was hydrothermally treated again with the addition of *** the molar ratio of glucose to Fe in the supernatant was 1.5,over 99.5%of Fe was precipitated in hematite nanoparticles with a diameter of 10-100 nm,and the residual Fe was 21.5 mg/*** loss of Zn was below 0.4%,and the residual Zn in the solution was 2169 mg/L,290 times of that in the smelting *** major mechanism for Fe removal was the hydrolysis of ferric nitrate into hematite,which was promoted by nitrate consumption in glucose *** paper is the first report of an environment-friendly method for enriching Zn without generating any waste.

关键词： smelting wastewater Hydrothermal Hematite precipitation Heavy metals

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