利用含锌工业固废制备高纯氧化锌的工艺研究.

Aiming at the problem that it is difficult to recover valuable zinc from industrial solid wastes such as zinc oxide tailings and Grain slags, this paper prepares high-purity zinc oxide micro powder by using carbothermal reduction and oxidation method with local industrial zinc-containing solid wastes as raw materials. The thermodynamic process of the reaction between zinc silicate and carbon reduction in the zinc-containing slag was analyzed by a combination of thermodynamic calculations and experimental studies through HSC Chemistry. The effects of carbon allocation, roasting temperature, roasting time and CaF2 on zinc yield during zinc silicate reduction were discussed, and the results showed that the catalytic effect was most significant at 1000 ℃~1100 ℃ when CaF2 was used as a catalyst. The optimum process conditions were obtained: the zinc yield reached 97.44% at a temperature of 1100 °C, a holding time of 40 min, a carbon content of 20 wt% and a CaF2 addition of 5 wt%. Structural and compositional analyses of the volatilized product showed that the physical phase was hexagonal zinc oxide crystals with a particle size of 2~4 um and a purity of 99.47%. [ABSTRACT FROM AUTHOR]