ABSTRACT The effects of leaching parameters on the metal dissolutions from Caldag laterite ore using hydrochloric acid at atmospheric pressure were investigated. The following leaching parameters were examined to understand their effects on the dissolution of the metals: hydrochloric acid concentration, solid/liquid ratio, particle size, leaching temperature and time. Extractions of 95.8%Ni, 94.5%Co and 94.3%Mn into the leach solution were obtained along with a substantial amount of iron (81.5%) under the following conditions: 3.0 M HCl concentration, 90°C leaching temperature, 8 h leaching time, 1/5 solid/liquid ratio and −0.053 mm particle size. The hydrochloric acid consumption under these optimum conditions was found to be 543 kg t–1 ore. The results indicated that hydrochloric acid concentration and leaching temperature were the most important parameters affecting metal dissolutions. It was found that the dissolution of nickel did not exhibit a good linear correlation to that of manganese, which suggested that considerable amounts of nickel were not hosted in asbolane phase but also in other mineral phases such as goethite, haematite and clays. It was, however, found that most of the cobalt appeared to be hosted in asbolane. The semi-quantitative mineral analyses revealed that mineral dissolution order was as follows: calcite > goethite > haematite > lizardite ≥ chlorite-serpentine > asbolane > albite > kaolinite.

中文翻译：

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浸出参数对Caldag红土镍矿中镍、钴、锰、铁在盐酸溶液中溶解的影响

摘要 研究了在常压下使用盐酸浸出参数对 Caldag 红土矿金属溶解的影响。检查以下浸出参数以了解它们对金属溶解的影响：盐酸浓度、固液比、粒度、浸出温度和时间。在以下条件下，提取了 95.8% Ni、94.5% Co 和 94.3% Mn 以及大量铁 (81.5%)：3.0 M HCl 浓度、90°C 浸出温度、8 小时浸出时间, 1/5 固/液比和 -0.053 mm 粒径。发现这些最佳条件下的盐酸消耗量为 543 kg t-1 矿石。结果表明，盐酸浓度和浸出温度是影响金属溶解的最重要参数。发现镍的溶解与锰的溶解没有很好的线性相关性，这表明大量的镍不是存在于 asbolane 相中，而是存在于其他矿物相中，例如针铁矿、赤铁矿和粘土。然而，发现大部分钴似乎存在于 asbolane 中。半定量矿物分析表明，矿物溶解顺序为：方解石>针铁矿>赤铁矿>蜥蜴石≥绿泥石-蛇纹石>asbolane>钠长石>高岭石。这表明大量的镍不是存在于 asbolane 相中，而是存在于其他矿物相中，例如针铁矿、赤铁矿和粘土。然而，发现大部分钴似乎存在于 asbolane 中。半定量矿物分析表明，矿物溶解顺序为：方解石>针铁矿>赤铁矿>蜥蜴石≥绿泥石-蛇纹石>asbolane>钠长石>高岭石。这表明大量的镍不是存在于 asbolane 相中，而是存在于其他矿物相中，例如针铁矿、赤铁矿和粘土。然而，发现大部分钴似乎存在于 asbolane 中。半定量矿物分析表明，矿物溶解顺序为：方解石>针铁矿>赤铁矿>蜥蜴石≥绿泥石-蛇纹石>asbolane>钠长石>高岭石。