The effects of cations stress of magnesium ion and sodium ion on the low-grade nickel sulfide ore oxidative leaching in simulated sulfuric acid solutions were investigated. This study was performed in two courses, including the effect of the cations on the valuable metals leaching efficiencies of the nickel ore and its influences on the electrochemical oxidation behavior of the nickel ore. The leaching results present that parts of magnesium-containing gangues and ferrous sulfide are preferentially dissolved into lixivium, and the leaching efficiencies of Ni and Cu decreased much related to the leached concentrations of Mg²⁺ increased. The results of electrochemical measurements show that the oxidation leaching of the low-grade nickel sulfide ore is controlled by the intermediates oxidative diffusion. Mg²⁺, as well as Na⁺, affects the transformations of the Fe³⁺/Fe²⁺ couple and sulfur-containing species, and those cations are apt to be attracted by the anions and directionally adhere to the negative active site of the metal sulfide surface, causing an increase in the electrochemical activities, which facilitates the electron transfer between the ore and leaching mediums. By comparative study of the role of Mg²⁺ and Na⁺, it is found that Mg²⁺ negatively affects the oxidative diffusion of the intermediates through promoting the generation of a compact film, which lowers the metals leached efficiencies, and the unfavorable effect of Na⁺ tends to be the coupled effect of the leached Mg²⁺ and Fe³⁺.

研究了镁离子和钠离子的阳离子应力对模拟硫酸溶液中低品位硫化镍矿氧化浸出的影响。这项研究分两个过程进行，包括阳离子对镍矿石中有价值的金属浸出效率的影响及其对镍矿石电化学氧化行为的影响。浸出结果表明，部分含镁的脉石和硫化亚铁优先溶解在浸出液中，Ni和Cu的浸出效率下降与Mg ²⁺的浸出浓度增加有很大关系。电化学测量结果表明，低品位硫化镍矿的氧化浸出受中间体氧化扩散的控制。镁²⁺以及Na ⁺会影响Fe ³⁺ / Fe ²⁺对和含硫物质的转化，这些阳离子易于被阴离子吸引并定向附着在金属的负活性位点上硫化物表面，导致电化学活性增加，从而促进了矿石与浸出介质之间的电子转移。通过对Mg ²⁺和Na ⁺的作用进行比较研究，发现Mg ²⁺通过促进致密膜的产生对中间体的氧化扩散产生负面影响，从而降低了金属的浸出效率，以及Mg ²⁺和Na ⁺的不利作用。钠⁺Mg ²⁺和Fe ³⁺的耦合作用往往是。