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叙述了一种在水溶液中用SO_2和O_2的混合气体浸出硫化锌精矿的新方法,SO_2/O_2与希尔和埃鲁拉的锌精矿反应,生成锌和铁的硫酸盐、元素硫和一些硫酸。锌的提取反应速度表面受化学反应控制,即使气相中SO_2的浓度高达9％,元素硫层对反应也没有明显干扰。精矿中的黄铁矿起一种活化作用,可能是通过与闪锌矿的电池作用所致。金属的提取率取决于气体中SO_2和O_2的含量、矿石粒度、溶液的酸度和锌的含量,而与三价铁离子含量无关。大约在85℃时,就可以达到最大的提取率。在40克/升或更高的酸度下,在有亚铁离子存在时,通过控制反应可以阻止酸的产生。通过SO_2/O_2的浸出处理可以降低埃鲁拉铅精矿中锌和铁的含量。
A new method for leaching zinc sulfide concentrate from a mixed gas of SO 2 and O 2 in aqueous solution is described. SO 2 / O 2 reacts with zinc concentrate from Hill and Elura to generate sulfate and elemental sulfur of zinc and iron, Some sulfuric acid. The speed of zinc extraction reaction is controlled by the chemical reaction. Even if the concentration of SO 2 in the gas phase reaches as high as 9%, the elemental sulfur layer has no obvious interference on the reaction. The pyrite in the concentrate plays an activation role, probably due to the cell interaction with the sphalerite. The extraction rate of metal depends on the content of SO2 and O2 in the gas, the particle size of the ore, the acidity of the solution and the content of zinc, but not the content of ferric ions. At about 85 ° C, the maximum extraction rate is achieved. At 40 g / l or higher acidity, acid production can be blocked by controlling the reaction in the presence of ferrous ions. The SO 2 / O 2 leaching treatment can reduce the content of zinc and iron in Elura lead concentrate.