Hydrometallurgical process for extracting bismuth from by-product of lead smelting based on methanesulfonic acid system

基于甲基磺酸体系从铅冶炼副产物中湿法提铋

A new hydrometallurgical process based on the methanesulfonic acid system was proposed to extract the bismuth efficiently from by-products of lead smelting.The bismuth extraction process included electrorefining,oxidation leaching,and electrodeposition.The optimum conditions of the bismuth extraction process were determined by a single-factor test.The bismuth plate with a purity of 99.8%was obtained under the optimum conditions.Cyclic voltammetry and linear sweep voltammetry were applied to investigating the cathode reaction mechanism of electrorefining.The results show that lead deposition,bismuth deposition,and hydrogen evolution occur at the cathode,and the reactions of metals deposition are irreversible and diffusion-controlled.In addition,decreasing the temperature and acidity can improve the purity of the cathodic product(lead powder)in the electrorefining process.

为有效提取铅冶炼副产物中的铋,提出一种基于甲基磺酸体系的湿法提铋新工艺。提铋工艺包括电精炼、氧化浸出和电沉积。通过单因素试验确定提取铋的最佳工艺条件。在最优工艺条件下,得到纯度为99.8%的铋板。采用循环伏安法和线性扫描伏安法研究电解精炼的阴极反应机理。结果表明,铅和铋的沉积及氢析出反应均为不可逆反应,且反应的控制步骤为扩散控制;另外,电解精炼过程中,较低的反应温度和酸度可以提高阴极铅粉的纯度。