采用NaOH?Na2S碱浸方法实现了高砷烟尘中砷的选择性浸出。在砷浸出过程中，探讨了碱料比、硫化钠用量、浸出温度、浸出时间和液固比对各金属元素浸出率的影响。结果表明：在碱料质量比为0.5，硫化钠用量为0.25 g/g，浸出温度为90°C，浸出时间为2 h，液固比为5：1的优化条件下实现了砷与其他金属的有效分离。在优化条件下，砷、锑、铅、锡和锌的平均浸出率为92.75%,11.68%,0.31%,29.75%和36.85%。NaOH?Na2S碱性浸出过程提供了一种从含砷烟尘中脱除砷的简单有效的方法，同时产生具有利用价值的铅渣。
Arsenic is selectively extracted from high-arsenic dust by NaOH?Na2S alkaline leaching process. In the leaching arsenic process, the effects of alkali-to-dust ratio, sodium sulfide addition, leaching temperature, leaching time and liquid-to-solid ratio on metals leaching efficiencies were investigated. The results show that the arsenic can be effectively separated from other metals under the optimum conditions of alkali/dust mass ratio of 0.5, sodium sulfide addition of 0.25 g/g, leaching temperature of 90 °C, leaching time of 2 h, and liquid-to-solid ratio of 5:1 (mL/g). Under these conditions, the average leaching efficiencies of arsenic, antimony, lead, tin and zinc are 92.75%, 11.68%, 0.31%, 29.75% and 36.85%, respectively. The NaOH?Na2S alkaline leaching process provides a simple and highly efficient way to remove arsenic from high-arsenic dust, leaving residue as a suitable lead resource.
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