中南大学学报（自然科学版）2011，Vol.42Issue(12)：3623-3629,7.
氰化渣磁化焙烧过程中铁化合物反应行为的热力学分析
Thermodynamics analysis of ferric compound during roasting-preparing process of cyanide tailings
摘要
Abstract
Based on the thermodynamic analyse of ferric oxide reductive and ferric oxide with calcium silicates, fayalite with calcium oxide and Fe3O4 with silicon dioxide during roasting-preparing process, respectively, the thermodynamic of those reactions was determined. The magnetic roasting followed by magnetic separation experiments was done, cyanide tailing and calcine were characterized by ICP, XRD and XRF. The results show that ferric oxide can be reduced to Fe3O4 at low temperature and low concentrations of CO, and when molar ratio of CaO and SiO2 I.e., n(CaO)/n(SiO2) is 1:1, ferric oxide does not react with composition of calcium and suicides, which will not result in the loss of iron. Even when CO is added, Fe3O4 can be in steady existence with the proper amount of additives. If calcium oxide is added, the iron in fayalite can be replaced, thus the roasting effect can be promoted. The adding capacity of calcium oxide is an important factor of influencing roasting effect. When n(CaO)/n(SiO2)=1:1, time is 90 min, n(N2):n(CO)=4:1, and temperature is 880 K, a iron ore concentrate with total iron content of 60% and Fe recovery rate of 84% can be received. The experiment results well accord with the calculation results.关键词
氰化渣/焙烧/Fe2O3/Fe3O4/热力学分析Key words
cyanide tailings/ roasting/ Fe2O3/ Fe3O4/ thermodynamics analysis分类
矿业与冶金引用本文复制引用
张亚莉,于先进,李小斌,张丽鹏,李德刚..氰化渣磁化焙烧过程中铁化合物反应行为的热力学分析[J].中南大学学报（自然科学版）,2011,42(12):3623-3629,7.基金项目
山东省自然科学基金资助项目(ZR2010EL006) （ZR2010EL006）
