China Nonferrous Metallurgy

The raw material zinc concentrate used in a new zinc smelter in Xinjiang has the characteristics of high silicon content and low other impurities. Because the high silicon ore will produce sintering in the roasting furnace and ring formation in the rotary kiln in the pyrometallurgical system of zinc smelting, the solid and liquid is difficult to separate after leaching in the wet system, and the above situation will seriously affect the normal operation of the production system. Based on this, the existing form, metallurgical behavior and impact on various zinc smelting systems of silicon were analyzed and studied, and the influence of silicon on different stages of zinc smelting (roasting, acid making, leaching, rotary kiln) and control measures is investigated. The results show by controlling the roasting temperature of 880±20℃, the ratio of silicon to calcium of rotary kiln material is 4∶1, the pH value of acid leaching end point is 0.5~1.5, and using the intermediate leaching and acid leaching supernatant to dilute the corresponding reaction solution 1 time, the combined fire and wet process for treating high silicon and low impurity zinc concentrate is established, which can ensure the normal and stable operation of smelting system and will produce good economic benefits.