氧化-混凝法处理含砷选矿废水的试验研究  

Treatment of Arsenic-Bearing Beneficiation Wastewater by Oxidation-Coagulation Process

作　　者：严群[1,2,3] 余洋[1] 周娜娜[1] 徐晶[1] 桂勇刚 罗仙平[1,3] 

机构地区：[1]江西理工大学资源与环境工程学院,江西赣州341000 [2]江西理工大学建筑与测绘工程学院,江西赣州341000 [3]江西省矿冶环境污染控制重点实验室,江西赣州341000

出　　处：《稀有金属》2014年第1期130-137,共8页Chinese Journal of Rare Metals

基　　金：国家科技部"十二五"科技支撑计划项目(2012BAC11B07);"赣鄱英才555工程"领军人才培养计划;江西省自然科学基金项目(20122BAB203027);江西省教育厅科技计划产学研合作项目(GJJ11005);国家大学生创新训练项目(GZG-12-08-32)资助

摘　　要：以某钨矿含砷选矿废水为处理对象，针对常规铁盐混凝工艺除砷的不足，提出采用氧化-铁盐混凝法。氧化剂选用双氧水和次氯酸钠，研究探讨了两种氧化剂对混凝沉淀法除砷效果的影响。结果表明，当铁盐除砷的工艺条件：pH值7．55左右，三氯化铁投加量453．33mg·L^-1（Fe／As摩尔比=3．0），混凝反应时间25min，PAM投加量40mg·L^-1固定时，双氧水氧化反应阶段的最佳工艺条件为：pH值5．50—7．50，氧化时间25min，双氧水投加量950mg·L^-1，选矿含砷废水经该预氧化工艺处理后，再由铁盐沉淀法处理，出水砷浓度降至0．302mg·L^-1，砷去除率达到99．28％；次氯酸钠氧化反应阶段的最佳工艺条件为：pH值6．00～8．00，氧化时间25min，次氯酸钠投加量1500mg·L^-1，选矿含砷废水经该预氧化工艺处理后，再由铁盐沉淀法处理，出水砷浓度为0．437mg·L^-1，砷去除率可达到99．0％。经比较分析得出双氧水为最佳氧化剂。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 NaC10 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（nro/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 0.3O2 mg.L-1 , removal rate of arsenic reached 99.28%. The optimum conditions for pre-oxidation of NaCIO 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 NaC10, then by coagulation. After 60 rain 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.

关 键 词：选矿废水 砷 氧化 混凝 

分 类 号：X751[环境科学与工程—环境工程]