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通过盐酸酸浸锆冶金废渣回收碱熔过程中已发生分解的锆,分析了盐酸浓度、酸浸温度、液固比等工艺参数对碱熔过程中已发生分解的锆回收率的影响,并对锆冶金废渣中的物相组成、回收前后锆元素在锆冶金废渣中存在的形态以及对锆元素的回收工艺流程进行了研究。结果表明:盐酸浓度、酸浸温度是影响锆回收率的主要因素。锆冶金废渣中已分解锆的回收率随着盐酸浓度的增大而增大,当盐酸浓度由2mol·L~(-1)增大到4 mol·L~(-1)时,锆的回收率增幅仅为4.02%。锆冶金废渣中已分解锆的回收率随着温度的升高而升高,当酸浸温度超过50℃后,锆冶金废渣中已分解锆的回收率已无明显的增长。锆冶金废渣中锆元素主要以ZrSiO_4,ZrOCl_2两种形式存在,盐酸酸浸锆冶金废渣可实现对ZrOCl_2的回收。最佳的工艺条件为:盐酸浓度2 mol·L~(-1),酸浸温度50℃,液固比5∶1。在此条件下,碱熔过程中已发生分解的锆的回收率可达到62%。
The effect of hydrochloric acid concentration, acid leaching temperature, liquid-solid ratio and other process parameters on the zirconium which has been decomposed during the alkali fusion process was analyzed. Zirconium metallurgy waste residue in the phase composition, before and after the recovery of zirconium metallurgy waste slag morphology and the recovery of zirconium element process were studied. The results show that hydrochloric acid concentration and acid leaching temperature are the main factors affecting the zirconium recovery. The recovery of decomposed zirconium in zirconia metallurgical waste increases with the increase of hydrochloric acid concentration. When the concentration of hydrochloric acid increases from 2mol·L -1 to 4 mol·L -1, the recovery of zirconium The rate of increase is only 4.02%. The recovery of decomposed zirconium in zirconium metallurgical waste increases with the increase of temperature. When the acid leaching temperature exceeds 50 ℃, the recovery of decomposed zirconium in zirconium metallurgy waste has no obvious growth. Zirconium metallurgical waste zirconium mainly ZrSiO_4, ZrOCl_2 exist in two forms, hydrochloric acid acid impregnated zirconium metallurgical waste residue can achieve the recovery of ZrOCl_2. The optimum conditions were: hydrochloric acid concentration 2 mol·L -1, acid leaching temperature 50 ℃, liquid to solid ratio 5: 1. Under this condition, the recovery of zirconium that has decomposed during alkali melting can reach 62%.