Atmospheric acid leaching behaviour of scandium (Sc) in two different types of laterite nickel ore from Indonesia was investigated. Ore and leaching residue characterization was performed by XRD, FTIR, XPS, and SEM-EDX. Ore characterisation showed that the major minerals in limonitic laterite were goethite, magnetite, hematite, and saprolitic laterite mainly consisted of goethite, magnetite, lizardite, clinochlore. Sc in two different types of laterite nickel ore are distributed widely among minerals, but it mainly hosts in Al-bearing goethite and silicate minerals. Sc host minerals in limonitic and saprolitic laterite nickel ore are different. 84.27% and 59.86% of Sc in limonitic and saprolitic laterite could be leached under the experimental conditions of 3 mol/L H₂SO₄, 80℃ reaction temperature, leaching duration 3 h and liquid to solid ratio 6:1, respectively. The results show that Sc and Mn, Mg in limonitic laterite have similar dissolution characteristics because the extractions of Sc and Mn, Mg are linearly correlated. Sc in limonitic laterite is susceptible to acid attack and easier to be extracted than other metals except for Mn. Sc and Ni in saprolitic laterite have similar dissolution characteristics because Sc is not strongly related to metals other than Ni. Sc in saprolitic laterite is more difficult to extract than Mg and Ni, but it is easier to be leached than other metals. The dissolution kinetics was found to fit well to the shrinking core model with the diffusion through the product layer as the rate controlling step. Results of this research may assist in the development of a more efficient process for exacting Sc from laterite nickel ores.

研究了印度尼西亚两种不同类型红土镍矿中钪 (Sc) 的常压酸浸行为。通过 XRD、FTIR、XPS 和 SEM-EDX 对矿石和浸出渣进行表征。矿石表征表明，褐铁矿中的主要矿物为针铁矿、磁铁矿、赤铁矿，腐泥土红土主要为针铁矿、磁铁矿、蜥蜴矿、斜绿石。两种不同类型的红土镍矿中的Sc在矿物中分布广泛，但主要存在于含铝针铁矿和硅酸盐矿物中。褐铁矿和腐泥土红土镍矿中的 Sc 宿主矿物是不同的。在3 mol/LH ₂ SO ₄实验条件下，褐铁矿和腐泥土红土中84.27%和59.86%的Sc可浸出，反应温度80℃，浸出时间3h，液固比6：1。结果表明，褐铁矿中的Sc和Mn、Mg具有相似的溶解特征，因为Sc和Mn、Mg的提取量呈线性相关。褐铁矿红土中的 Sc 易受酸侵蚀，比除 Mn 以外的其他金属更容易提取。腐泥土红土中的 Sc 和 Ni 具有相似的溶解特性，因为 Sc 与除 Ni 之外的金属没有很强的相关性。腐泥土中的Sc比Mg和Ni更难提取，但比其他金属更容易浸出。发现溶解动力学与通过产品层的扩散作为速率控制步骤的收缩核心模型非常吻合。