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以人工合成的高纯度铁闪锌矿为研究对象,基于对388K温度条件下浸出过程物相及矿物表面性质变化的分析,研究锌、硫、铁等元素的低温加压浸出行为。结果表明,元素锌仅发生溶解反应而且溶解锌能稳定存在于水溶液中;浸出初期,铁闪锌矿电化学氧化反应滞后,而铁闪锌矿酸溶反应才是浸出初期最主要的化学反应,浸出初期无SO42-氧化生成,但在浸出后期,可能有少量单质硫进一步氧化生成SO42-。单质硫是铁闪锌矿最主要的氧化产物;浸出过程中,铁溶出与溶解铁的水解沉淀反应是同步进行的。在浸出初期,铁的溶出占主导地位,而在浸出后期,溶解铁的水解沉淀则是主要反应而且铁的沉淀形态可以调控。
Based on the analysis of the leaching process and the changes of the surface properties of minerals under the temperature of 388K, the artificial leaching of high-purity marmatite was studied to study the leaching behavior of zinc, sulfur and iron at low temperature. The results show that the elemental zinc dissolves only and the dissolved zinc can stably exist in aqueous solution. In the early leaching period, the electrochemical oxidation reaction of marmatite lags behind, whereas the marmatite acid dissolution reaction is the most important chemical reaction during the initial leaching period. In the early stage of leaching, there is no SO42- oxidation, but in the late leaching stage, a small amount of elemental sulfur may be further oxidized to SO42-. Elemental sulfur is the most important oxidation product of marmatite. During the leaching process, the iron dissolution and the hydrolysis and precipitation reaction of dissolved iron are carried out simultaneously. Iron leaching predominates in the early stages of leaching, whereas in the latter stage of leaching, hydrolytic precipitation of dissolved iron is the predominant reaction and iron precipitation patterns can be regulated.