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首页> 外文期刊>Hydrometallurgy >Selective leaching of nickel from mixed nickel cobalt hydroxide precipitate
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Selective leaching of nickel from mixed nickel cobalt hydroxide precipitate

机译：从混合氢氧化镍镍沉淀物中选择性浸出镍

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摘要

A new method for acid leaching mixed nickel-cobalt hydroxide precipitate (MHP) is proposed; whereby nickel is largely dissolved while cobalt and manganese are stabilised in the solid phase by preferential oxidation. The relevant oxidation thermodynamics are presented. Metal extraction and leaching kinetics were not significantly affected by temperature over the range tested (30-80℃), or by the length of MHP ageing prior to leaching (three months vs. four years). Calcium and magnesium are the major solution impurities (0.1 g-Ca/L, 3 g-Mg/L). A portion of the calcium and magnesium can be selectively leached from the MHP at pH 7. Ther-modynamic analysis indicates that the leaching of nickel and the onset of copper and zinc leaching can be predicted assuming MHP is an ideal solid solution. Both thermodynamic analysis and chemical assay confirm that the nickel hydroxyl-sulphate stoichiometry is approximately Ni_7(0H)_(12)SO_4. The Gibbs energy of formation of metastable Ni_7(0H)_(12)SO_4 at 80℃ (353 K) was estimated to be -3356 kj/mole.
机译：提出了一种酸浸混合镍钴氢氧化物沉淀物的新方法。镍在很大程度上溶解，而钴和锰通过优先氧化而稳定在固相中。介绍了相关的氧化热力学。在试验范围内（30-80℃），金属的浸出和浸出动力学不受显着影响，浸出前的MHP老化时间（3个月对4年）也没有显着影响。钙和镁是主要的溶液杂质（0.1 g-Ca / L，3 g-Mg / L）。一部分钙和镁可以在pH 7时从MHP中选择性地浸出。热力学分析表明，如果MHP是理想的固溶体，则可以预测镍的浸出以及铜和锌的浸出。热力学分析和化学测定均证实羟基硫酸镍化学计量为大约Ni_7（0H）_（12）SO_4。在80℃（353 K）下，亚稳态Ni_7（0H）_（12）SO_4的形成的吉布斯能量估计为-3356 kj / mol。

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