针对铁矾渣的危害性及处理现状,结合其物相特点,提出"焙烧-水浸法"从含铟铁矾渣中回收锌、铟的清洁工艺,系统研究焙烧过程物相变化及反应机理,确定最佳焙烧条件.考察浸出时间、温度、固液比对浸出的影响规律.结果表明:在650℃焙烧2 h,可使含铟铁矾渣分解,同时Zn和In生成易于浸出的ZnSO4和In2(SO4)3,铁以难浸出Fe2O3形式存在.在常温下,控制液固比5:1,用水浸出焙砂0.5 h,Zn和In浸出率分别为72.02%和78.73%,Fe浸出率仅为4.42%,而Ag和Pb进入渣中富集回收.
Based on the perniciousness and dispose status of ammonium jarosite residue and its phase characteristics, a new process recovering Zn and In from ammonium jarosite residue bearing indium by roasting - water leaching method was put forward. The phase transformation and reaction mechanism of roasting process were investigated, and the best roasting conditions were determined. The effect laws of leaching time, temperature and solid-liquid ratio on leaching were investigated. The results show that, after roasting of jarosite at 650 ℃ for 2 h, ammonium jarosite bearing indium is decomposed into Fe2O3, ZnSO4 and In2(SO4)3. The roasted jarosite residue is leached by water at room temperature for 0.5 h. The leaching rate of Zn and In are 72.02% and 78.73%. The leaching rate of Fe is only 4.42%, Ag and Pb are enriched into the residue.