Experimental Study on Arsenic Removal from Leaching Solution of Zinc Oxide Fume

Arsenic impurities in zinc oxide fume leaching solution were removed by ferric salt precipitation combined with oxidation. The effects of reaction time, reaction temperature, pH value of solution, oxygen flow rate, and ultrasonic power on arsenic removal were studied. The experimental results show that, under the conditions of reaction time 120 min, reaction temperature 70 degrees C, solution pH 5.0, ultrasonic power 270 W, and oxygen flow rate 0.8 L/min, the arsenic removal rate of secondary arsenic removal can reach 98.77%, the zinc loss rate is only 2.54%, and the amount of dry slag after arsenic removal is 6.8732 g. The arsenic content in the purification solution can be reduced to 0.021 g /L, and the iron content can be reduced to 0.34 g /L. Compared with the traditional industrial ferric salt precipitation method, this method has the advantages of less waste residue, low zinc loss rate, and no harmful by-products, which can save costs and achieve the effect of energy conservation and emission reduction.