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探索闪锌矿精矿高压酸浸的反应机理,制备一种相对纯净的闪锌矿,并在添加铁离子和不添加铁离子两种情况下对其进行高压酸浸试验。在浸出体系中没有铁元素时,闪锌矿浸出速度很慢。如在氧分压0.3 MPa,温度160℃下浸出180min,锌的浸出率也仅有11.06%。在浸出体系中加入铁元素后,闪锌矿浸出速度加快了。在上述例子的条件下,锌的浸出率达到62.55%。然而,温度低于150℃,铁元素并没表现出对闪锌矿浸出的促进作用。锌的浸出速度曲线和亚铁离子氧化速度曲线的趋向是一致的,尽管两者不按比例变化。闪锌矿的浸出速度随着浸出体系中铁元素浓度的增大而不断增大,但当铁离子达到一定浓度后,闪锌矿的浸出速度不再有明显的增大。在一定的反应条件下,铁(或其他变价金属元素)的氧化是高压酸浸过程不可或缺的步骤,并且在一定范围内,铁离子的浓度决定了浸出的速度,对浸出机理进行了阐述。
To explore the reaction mechanism of high pressure acid leaching of sphalerite concentrate, a relatively pure sphalerite was prepared and subjected to high pressure acid leaching test with and without iron ion addition. When there is no iron in the leaching system, the leaching rate of sphalerite is very slow. If the oxygen partial pressure of 0.3 MPa, leaching temperature 160 ℃ 180min, the leaching rate of zinc is only 11.06%. After the iron element is added to the leaching system, the leaching rate of sphalerite is accelerated. Under the conditions of the above example, the leaching rate of zinc reached 62.55%. However, at temperatures below 150 ° C, the iron element did not show a promoting effect on the leaching of sphalerite. The trend of the zinc leaching rate profile and the ferrous ion oxidation rate profile is consistent, although the two are not to scale. The leaching rate of sphalerite increases with the concentration of iron in the leaching system, but the leaching rate of sphalerite no longer increases obviously when the concentration of iron reaches a certain concentration. Under certain reaction conditions, the oxidation of iron (or other variable-valent metal elements) is an indispensable step in the high-pressure acid leaching process, and within a certain range, the concentration of iron ions determines the leaching rate and the leaching mechanism is described .