Removal of arsenic from zinc oxide leaching solution by oxygen combined with ultrasonic

In this study, the oxidation method combined with the iron salt precipitation method was used to remove the arsenic impurities in the zinc oxide fume leaching solution after germanium precipitation. First, the Fe2+ and As5+ in the solution are oxidized by oxygen with a specified flow rate into the solution, and then the calcination fume is added to adjust the pH value of the solution with Zn compounds such as ZnO, so that the impurity elements in the solution are precipitated. The effects of reaction time, reaction temperature, roasting soot input, oxygen flow rate and ultrasonic power on the arsenic removal rate were investigated in the experiment. The experimental results show that under the conditions of reaction time of 120min, reaction temperature of 70℃, roasting soot input of 7g, ultrasonic power of 240W and oxygen flow of 0.8L/min, the removal rate of arsenic can reach 92.77% by two-stage arsenic removal. , the loss rate of zinc is only 2.54%, and the amount of dry slag after removal is 5-7g. Compared with the iron salt precipitation method in the traditional industry, it has the advantages of less slag, less zinc loss, no harmful by-products, etc., and the main raw materials used oxygen and roasting dust are cheap products, which can save costs. The arsenic content in the finally obtained filtrate can reach 0.125g/L, and less than 0.2g/L can meet the requirements of the subsequent electrolysis process, and can be used for practical industrial production applications.