Treatment of arsenic-bearing beneficiation wastewater by oxidation-coagulation process

被引：0
作者：
机构：
[1] Faculty of Resources and Environment Engineering, Jiangxi University of Science and Technology
[2] Faculty of Architectural and Surveying and Mapping Engineering, Jiangxi University of Science and Technology
[3] Jiangxi Key Laboratory of Environmental Pollution Control of Mining and Metallurgy
来源：
Luo, X. (lxp9491@163.com) | 1600年 / Editorial Office of Chinese Journal of Rare Metals卷 / 38期
关键词：
Arsenic; Beneficiation wastewater; Coagulation; Oxidation;
D O I：
10.13373/j.cnki.cjrm.2014.01.019
中图分类号：
学科分类号：
摘要：
In order to process arsenic-containing beneficiation wastewater from a tungsten mine, the oxidation-ferric salts coagulation method was put forward to overcome the demerits of conventional ferric salts coagulation process for arsenic removal. H2O2 and NaClO as oxidants were selected to investigate the effects of arsenic removed. The result showed that: on the basis of the same arsenic precipitation conditions by ferric salts, pH was about 7.55, the dose of ferric chloride was 453.33 mg·L-1 (nFe/nAs=3.0), the coagulation reaction time was 25 min, the dose of PAM was 40 mg·L-1, the optimum conditions for pre-oxidation of H2O2 was pH 5.50~7.50, oxidation reaction of 25 min, H2O2 dose of 950 mg·L-1. Arsenic-containing beneficiation wastewater firstly treated by pre-oxidation of H2O2, then by coagulation, after 60 min precipitation, the concentration of arsenic in effluent water was about 0.302 mg·L-1, removal rate of arsenic reached 99.28%. The optimum conditions for pre-oxidation of NaClO was pH 6.00~8.00, oxidation reaction of 25 min, H2O2 dose of 1500 mg·L-1. Arsenic-containing beneficiation wastewater was firstly treated by pre-oxidation of NaClO, then by coagulation. After 60 min precipitation, the concentration of arsenic in effluent water was 0.437 mg·L-1, removal rate of arsenic reached 99.0%. Through the comparative analysis, H2O2 was the best oxidant.
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页码：130 / 137
页数：7
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