某白烟尘碱浸试验研究

Experimental Study on Alkali Leaching of a White Smoke Dust

白烟尘是铜冶炼过程中产生的固体副产物,其中含有Cu,Zn,Pb,Au,Ag,Bi等有价元素,是潜在的资源。碱性浸出脱砷有工作环境好、适用范围广、能耗较低和技术手段丰富等优点,具有较好的工业化应前景,有望实现白烟尘中有价元素的综合利用。根据对铜冶炼过程白烟尘主要成分的赋存状态,采用氢氧化钠碱性浸出脱砷,As浸出脱除率保持在98%左右,渣含As降至1%以下,As与Cu、Pb、Zn等有价金属得以有效分离,采用石灰可以脱除碱浸液中As,以实现碱浸液中余碱的循环利用。

White dust is the solid by-product produced in the process of copper smelting, containing Cu, Zn, Pb, Au, Ag, Bi and other valuable elements, and it is a potential resource. Because alkaline leaching arsenic removal has such advantages as good working environment, wide application, low energy consumption and rich technical means, it gains better industrial prospect and is expected to achieve the comprehensive utilization of valuable elements in white dust. According to the existing condition of main elements in white dust in the process of copper smelting, u- sing sodium hydrate to make arsenic removal can achieve the goal that the removal rate of arsenic in As leaching so- lution is about 98%, the content of As in the slag less than 1%, and the content of As in Cu, Pb, Zn and other valu- able metals can be effectively separated. The use of lime can remove As out of the alkaline infiltration and can achieve the recycling of remnant alkali of alkali leaching.