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结合铅锌硫化矿富氧浸出过程,进行热力学计算,分别得到了PbS-H2O系,ZnS-H2O系各物质的G0值以及该体系下各反应对应的电位-pH表达式,并绘制出温度为160℃、氧分压为1.0MPa、离子活度为1.0时,PbS-H2O系、ZnS-H2O系、PbS-ZnS-H2O系的电位-pH图.图中存在着Zn2+、PbSO4和S单质稳定共存的区域,该区域的存在为铅锌硫化矿富氧浸出过程铅与锌分离以及单质硫的生成提供了理论上的依据,从热力学的角度验证了铅锌硫化矿富氧浸出工艺的可行性.
Combined with the oxygen leaching process of Pb-Zn sulphide ore, thermodynamic calculations were carried out to obtain the G0 values of PbS-H2O system and ZnS-H2O system respectively and the potential-pH expression of each reaction under the system. PbS-H2O system, ZnS-H2O system and PbS-ZnS-H2O system at 160 ℃, the partial pressure of oxygen is 1.0MPa and the ion activity is 1.0. The Zn2 +, PbSO4 and S elements are stable The existence of this region provides a theoretical basis for the separation of lead and zinc and the formation of elemental sulfur in the leaching process of oxygen-enriched lead-zinc sulfide ores, and verifies the feasibility of the oxygen-enriched leaching process of lead-zinc sulfide ores from the thermodynamic point of view .