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在湿法炼锌中生成难溶性的铁酸锌是锌、锗浸出率低的原因。采用还原沸腾焙烧锌焙砂的工艺可有效地把铁酸锌还原分解成可溶性的产物,赋存其中的锗也将大部分溶出。本文研究了锌焙砂的物相组成,对铁酸锌还原过程的热力学、动力学进行了分析和研究。从而确定了铁酸锌还原分解的工艺条件并查明锗在工艺中的行为。在800—860℃,CO 8—12％的条件下对锌焙砂还原焙烧20—40min使锌浸出率从87％提高到98.5％,锗浸出率从47％提高到85—90％。研究证实了还原分解铁酸锌工艺的可行性。
In zinc hydrometallurgical production of insoluble zinc is zinc, germanium leaching rate is low. The process of reducing roasting calcined roasted zinc roaster can effectively reduce and decompose the zinc ferrite into soluble products, and the germanium contained therein will also be mostly dissolved. In this paper, the phase composition of zinc calcine was studied, and the thermodynamics and kinetics of the zinc ferrite reduction process were analyzed and studied. Thus, the process conditions for the reduction and decomposition of zinc ferrite were determined and the behavior of germanium in the process was ascertained. The roasting of calcine at 800-860 ℃ and CO 8-12% for 20-40min increased the zinc leaching rate from 87% to 98.5% and the germanium leaching rate from 47% to 85-90%. The research confirmed the feasibility of reducing and decomposing zinc ferrite.