微电流作用下锌板电置换提镉新工艺  

A new process of electrical replacement for cadmium extraction by zinc plate under micro current

作　　者：何静[1] 王夏阳[1] 叶龙刚[1] 张家玮[1] 杨建广[1] 戚春萍 

机构地区：[1]中南大学冶金与环境学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2016年第3期711-716,共6页Journal of Central South University:Science and Technology

基　　金：湖南省科技重大专项(2012FJ1010);国家自然科学基金资助项目(51174240)~~

摘　　要：为解决传统锌粉置换提镉流程复杂、锌粉消耗大和镉绵纯度低的难题,提出以锌板作阳极,钛网为阴极,在微电流作用下置换海绵镉的工艺,考察电流密度、温度、p H及极距等因素对电置换效率的影响。研究结果表明:在电流密度为0.5 m A/cm2,极距为3 cm,p H为1.0和温度为40℃的条件下,提镉率可达96%以上,镉绵纯度达97%以上,在此条件下获得的海绵镉为六方晶系,是层片状正六方形的树枝状晶体。随着电流密度增大、温度升高以及p H降低,提镉率都有不同程度地增大,而极距对提镉率的影响不明显。In order to solve the shortcomings in the process of the traditional cadmium extraction by zinc powder cementation, including complex process, great consumption of zinc powder, low-purity sponge cadmium, high production cost and much damage to environment, a new process of replacement for sponge cadmium extraction by zinc plate during the action of microcurrent was proposed. In this process, zinc plate was used as anode and titanium mesh as cathode. The effects of different factors on the replacing ratio were examined such as current density, temperature, p H value and the polar distance. The results show that the cadmium rate is higher than 96% and the purity of sponge cadmium is more than 97% under the optimum conditions（current density of 0.5 m A/cm2, polar distance of 3 cm, p H of 1 and temperature of 40 ℃）. Sponge cadmium obtained under this condition is hexagonal, lamellar positive hexagonal dendrite. The cadmium cementation ratio has different degrees of growth when the current density increases, the temperature rises and the p H decreases, while the polar distance has little effect on it.

关 键 词：微电流 锌板 电积 置换 海绵镉 

分 类 号：TF819.2[冶金工程—有色金属冶金]