【摘要】 对锌浸出渣熔池熔炼碳还原炼铁反应过程进行了热力学分析。结果表明:Zn Fe2O4和KFe3(SO4)2(OH)6受热分解的含铁产物是Fe2O3,Zn Fe2O4在300~1800 K温度范围内不能自发分解,KFe3(SO4)2(OH)6在652.25K即可分解;高pCO/pCO2、低温(但要高于炉渣熔融的温度)有利于熔体中的Fe2O3还原生成液态铁;含硫物相低温分解后的产物有金属硫酸盐K2SO4和Ca SO4,两者热分解脱硫的有利条件均是高温及低硫分压、低氧分压(但氧分压要高于硫酸盐分解生成硫化物的限值),Ca SO4热分解脱硫比K2SO4易于进行。锌浸出渣中碱性氧化物Ca O的存在,一方面可以降低Zn2Si O4碳热还原的起始反应温度,另一方面可以提高炉渣碱度及炉渣中Ca O的活度,降低硫在铁液与炉渣中的分配平衡常数。更多还原

【Abstract】 Iron-making of zinc leaching residue was obtained by carbon reduction in bath smelting, and the thermodynamic process was analyzed. The results show that Fe2O3 is the pyrolysis product of Zn Fe2O4 and KFe3(SO4)2(OH)6. Zn Fe2O4 can not decompose in the temperature range of 300-1800 K, but KFe3(SO4)2(OH)6decomposes at 652.25 K. Higher pCO/pCO2 and lower temperature that should be higher than the slag melting temperature, are favor able to the reduction of Fe2O3. The metal sulfates of K2SO4 and Ca SO4 are decomposing products of sulfur-contained phases at low temperature, and the favorable desulfurization conditions of K2SO4 and Ca SO4 are high temperature, low sulfur-partial pressure and low oxygen-partial pressure that must be higher than the limit of sulfates converting into sulfides. The desulfurization of Ca SO4 is easier than that of K2SO4. Ca O in zinc leaching residue reduces the initial reaction temperature of Zn2 Si O4 reduction, improves slag basicity and activity of Ca O in slag and decreases the sulfur distribution ratio between liquid iron and molten slag.更多还原