Abstract

In this study, magnesia–nickel silicate ore was investigated, which contained 0.83% Ni and antigorite, chlorite, magnetite (Fe₃O₄), quartz, and mica as the main minerals. Chloride roasting and magnetic separation were used to treat the ore. The addition of red mud enhanced the transformation of nickel silicate to a strongly magnetic mineral mainly comprising metallic Ni and that of hematite to Fe₃O₄ and metallic Fe. Test results showed that a Ni concentrate with a Ni content of 11.41% and Ni recovery of 92.77% was achieved under the following optimal conditions: roasting temperature: 1373.15 K; roasting time: 120 min; CaCl₂ dosage: 20%; coke dosage: 14%; red mud dosage: 30%; magnetic field intensity = 0.14 T; and grinding fineness: 90% < 0.05 mm. The major minerals in the Ni concentrate were Fe₃O₄, metallic Fe, and metallic Ni. Sc entered the magnetic separation tailings, creating a favorable condition for the further extraction of Sc by hydrometallurgy. The thermodynamic calculation results are in good agreement with the test results.

Graphical Abstract

中文翻译：

---

从氧化镁–硅酸镍矿石中提取镍

摘要

在这项研究中，研究了氧化镁-硅酸镍矿，其中含0.83％的镍和蛇纹石，绿泥石，磁铁矿（Fe ₃ O ₄），石英和云母为主要矿物。用氯化物焙烧和磁选法处理矿石。红泥的添加增强了硅酸镍向主要包括金属Ni和赤铁矿的强磁性矿物到Fe ₃ O ₄和金属Fe的转变。试验结果表明，在以下最佳条件下，可获得镍含量为11.41％，镍回收率为92.77％的镍精矿。烘烤时间：120分钟；氯化钙₂用量：20％；焦炭用量：14％；赤泥用量：30％；磁场强度= 0.14 T; 研磨细度：90％<0.05毫米。Ni精矿中的主要矿物是Fe ₃ O ₄，金属Fe和金属Ni。entered进入磁选尾矿，为湿法冶金进一步提取Sc创造了有利条件。热力学计算结果与试验结果吻合良好。

图形概要