湿法炼锌赤铁矿法沉铁渣水热除杂

湿法炼锌过程赤铁矿法沉铁渣可通过高温水热反应制备高附加值的氧化铁红.为揭示赤铁矿沉铁渣在高温水热转化过程中氧化铁、碱式硫酸铁、铁矾等的行为特点,采用热力学计算与试验研究相结合的方式,对高温水热反应过程中各物质的热稳定性进行研究.结果表明,在温度180～260℃下,铁矾和碱式硫酸铁的热稳定性差,氧化铁的热稳定性强,高温水...

Hydrothermal Removal Impurity from Hematite Residue in Zinc Hydrometallurgical Process

The hematite precipitation residue in zinc hydrometallurgical process,which could be prepared to high added value iron oxide red via high temperature hydrothermal reaction method.In order to reveal the behavior characteristics of iron oxide,basic ferric sulfate and jarosite in high temperature hydrothermal transformation process,the thermal stability of various substances in high temperature hydrothermal reaction were studied by the thermodynamic calculation and experiment.The results show that the thermal stability of jarosite and basic ferric sulfate is poor,while that of ferric oxide is strong at the temperature of 180—260℃.The high temperature hydrothermal conditions are favorable for the decomposition of jarosite,the hydrolysis of Fe³⁺ to Fe₂O₃,and the transformation of basic ferric sulfate to ferric oxide.After the high temperature hydrothermal reaction at 220℃,the iron content rise to 66.83%,in which 97.79%of the iron is ferric oxide and the content of ferric oxide reaches 93.36%.However,0.79%of the S still exists in the form of basic ferric sulfate,0.18%of the zinc and less than 0.002%of the potassium and sodium exist in the form of physical inclusion.