砷锑价态对铜电解液中砷锑铋脱除率的影响

采用SO2还原,使铜电解液中As(Ⅴ)还原为As(Ⅲ),Sb(Ⅴ)还原为Sb(Ⅲ),并调节电解液中As(Ⅴ)与As(T),Sb(Ⅴ)与Sb(T)的物质的量比,蒸发浓缩电解液,冷却结晶后,能有效脱除铜电解液中As,Sb和Bi等杂质。研究结果表明:当铜电解液体积为3L,Cu的质量浓度为32g/L,As(T)的质量浓度为9.36g/L,Sb(T)的质量浓度为0.65g/L,Bi的质量浓度为0.45g/L,n(As(Ⅴ))/n(As(T))和n(Sb(Ⅴ))/n(Sb(T))分别为0.4时,蒸发浓缩电解液,使浓缩前电解液与浓缩后电解液体积比为2.5,冷却至10℃结晶,过滤,铜电解液中Cu,As,Sb和Bi脱除率分别为82%,62%,55%和85%。蒸发浓缩结晶产物中含CuSO4.5H2O和As2O3。其结晶产物中Cu为29%,As为5%,Sb为0.37%,Bi为0.2%。

Effect of valences of arsenic, antimony on removal rates of arsenic,antimony and bismuth in copper electrolyte

Arsenic(Ⅴ) and antimony(Ⅴ) in copper electrolyte were reduced to arsenic(Ⅲ) and antimony(Ⅲ) with the aid of sulfur dioxide,and n(As(Ⅴ))/n(As(T)) and n(Sb(Ⅴ))/n(Sb(T)) were adjusted,then the copper electrolyte was concentrated to crystallize,As,Sb,Bi in the copper electrolyte could be removed effectively.The results indicate that when the volume of the copper electrolyte is 3 L,Cu concentration is 32 g/L,As(T) concentration is 9.36 g/L,Sb(T) concentration is 0.65 g/L,Bi concentration is 0.45 g/L,both n(As(Ⅴ))/n(As(T)) and n(Sb(Ⅴ))/n(Sb(T)) are 0.4,the removal rates of Cu,As,Sb and Bi are 82%,62%,55% and 85% respectively after copper electrolyte is concentrated and the ratio of initial volume and final volume is 2.5 time to crystallized at 10 ℃.XRD analysis shows that the crystallized product includes CuSO4 · 5H2O and As2O3.XRF analysis shows that the content of Cu,As,Sb and Bi in the crystallized product are 29%,5%,0.37% and 0.2% respectively.