【摘要】 本文采用了水浸方法从含有多种金属的冶金烟尘中提取As₂O₃,目的在于脱砷的同时使其中有价金属特别是铟得以富集。主要研究了浸出温度、浸出液固比（LSR）和浸出时间对脱砷过程的影响。结果显示,在浸出初期砷溶解极快,但随着浸出液中砷浓度的提高,砷的浸出受到抑制。这使得浸出液难以达到饱和,即使使用过量的水也难以在可接受的时间范围内（120 min）将砷全部浸出。在最佳实验条件下,As₂O₃的浸出率仅为73%。采用两步浸出法,对于脱砷效果并无根本性的改善。这些现象可由As₂O₃溶解反应的可逆性得以解释。动力学上,浸出过程可用半经验的Avrami模型进行描述,经计算,反应活化能为36.08 kJ/mol。实验所得As₂O₃纯度可达98.7%,且水浸过程中铟并未发生损失。更多还原

【Abstract】 Water leaching of As₂O₃ from metallurgical dust containing various metals was investigated, serving the purpose of dearsenization and simultaneous metal enrichment especially for indium. Effects of leaching temperature, liquid/solid ratio（LSR） and leaching time were studied. It was found that the initial dissolution was very fast but was then so inhibited by the increasingly dissolved As₂O₃, which makes it difficult to saturate enough arsenic in the leaching solution or in leaching out all the soluble arsenic with excess dosage of water within acceptable time（120 min）. Only about 73% of As₂O₃ was extracted under the optimal conditions investigated. Two-step leaching showed similar trends and was thus unnecessary for improving As₂O₃ extraction. These observations could reasonably be accounted for the reversibility of the dissolution reaction. Kinetically, the leaching was described satisfactorily by the semi-empirical Avrami model with the apparent activation energy of 36.08 kJ/mol. The purity of the obtained product As₂O₃ could reach 98.7%, while the indium could be enriched in the leaching residue without loss.更多还原