材料期刊网

污酸是有色金属冶炼中普遍存在的废酸,具有污染物种类多成分复杂、酸度高且最难处理的特点.污酸也是冶炼厂酸性重金属离子废水主要来源,其传统处理工艺产生大量危险废渣且处理成本高.旋流电解技术以可适用范围广且高选择性等特点日益受到重视.本论文利用旋流电解技术处理污酸溶液,研究了初始铜离子浓度对铜砷脱除效果的影响,并同并联循环连续电积脱砷法和控制阴极电势电积法做了比较.结果表明,在初始铜离子浓度为3 g·L-1时,旋流电解6h时砷脱除率最好(71.42％).初始铜离子浓度3g·L-1以内时,砷脱除率随初始铜离子浓度升高而升高;初始铜离子浓度超过3g·L-1时,初始铜离子浓度升高对砷脱除不利.旋流电解技术可在高电流密度500 A·m-2下进行脱砷,高于并联循环连续电积法的320 A·m-2和控制阴极电势电积法200 A·m-2;其渣中铜砷比可达o.65∶1.00,远低于并联循环连续电积法的(1.8～2.8)∶1.0和控制阴极电势电积法的6.6∶1.0,减少了砷渣中铜的含量.

Contaminated acid is a common waste acid in nonferrous metals smelting,which is characterized by complicated component,high acidity and hard to deal with.Contaminated acid is also the main source of the acid heavy metal ion wastewater in smelting plant.The traditional treatment process produced a large number of hazardous waste and cost a lot.Cyclone electrowinning technology with wide application and high selectivity attracted more and more attention.In this paper,cyclone electrowinning technology was used for contaminated acid treatment,and experiments were done on the effect of initial copper ion concentration on copper and arsenic removal.Comprehensive comparison was conducted on cyclone electrowinning technology,continuous parallel and cycle electrowinning and controlling cathodic potential electrowinning.The results showed that 71.42％ arsenic was removed from electrolyte when the initial copper ion concentration was 3 g·L-1in 6 h.When the initial copper ion concentration was less than 3 g·L-1,the arsenic removal rate increased with the increase of the initial concentration of copper ions.When the initial copper ion concentration was more than 3 g·L-1,the increase of initial copper ion concentration was unfavorable to arsenic removal.The current density of cyclone electrowinning was 500 A·m-2,which was higher than that of the continuous paralleland cycle electrowinning (320 A·m-2) and that of the controlling cathodic potential electrowinning (200 A·m 2).The copper arsenic ratio in the slag was 0.65∶ 1.00,which was far lower than that of continuous parallel and cycle electrowinning product ((1.8 ～ 2.8) ∶ 1.0) and that of controlling cathodic potential electrowinning (6.6∶ 1.0),and the content of copper in the slag was reduced.