利用热重分析仪、X射线衍射仪、扫描电镜分析了高砷高硫难处理金矿二次焙砂氰化尾渣硫酸熟化焙烧中铁物相变化及其终始状态矿物学特征。得出铁物相转变过程为：Fe2O3→HFe(SO4)2·4H2O→Fe2(SO4)3·5H2O→Fe2(SO4)3→Fe2O3。扫描电镜分析结果显示，硫酸熟化焙烧破坏了原有矿物有序结构，打开了包裹金的氧化铁，从而提高金的氰化浸出率。
By using TG-DTA analyzer, X-ray diffractometer (XRD) and scanning electron microscope (SEM), the phase transformation among ferric compounds in cyanidation tailing during sulfatizing roasting of refractory gold mineral with high sulfur and arsenic, along with mineralogical features of the beginning and ending state, were studied. The transformation can be presented as follows: Fe2O3→HFe(SO4)2·4H2O→Fe2(SO4)3·5H2O→Fe2(SO4)3→Fe2O3. SEM indicated that the well-ordered cyanidation tailing was destroyed and the envelop of hematite and matrix was opened by the sulfatizing roasting, thus boosted the cyanide leaching rate of gold was improved.
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