(1. 西南科技大学 环境与资源学院，绵阳 621010；
2. 西南科技大学 四川省非金属矿粉体改性与高质化利用工程实验室，绵阳 621010；
3. 四川省钒钛资源综合利用重点实验室，攀枝花 617000；
4. 西南科技大学 固体废物处理与资源化利用教育部重点实验室，绵阳 621010)
摘 要: 采用氯化焙烧和碱分解焙烧方法预先处理钪粗精矿(Sc2O3 44 g/t)，强化载钪矿物晶体结构的转变，为焙烧渣进一步浸出分离钪创造有利条件。结果表明：在Na2CO3和钪粗精矿质量比为0.45、焙烧温度为900 ℃、焙烧时间为120 min、盐酸浸出液固质量比(mliquid:msolid) R=5:1、盐酸浓度为6 mol/L的条件下两段浸出240 min，钪的浸出率为84.32%，浸出渣中Sc2O3含量为8.67 g/t。浸出渣的XRD、SEM-EDS及化学成分分析结果表明：浸出后钪粗精矿中的辉石类、角闪石等硅铝酸盐矿物物相谱峰消失，出现NaCl、CaTiO3、Fe2O3的谱峰，未见明显金属钪的谱峰，也进一步验证碱分解焙烧能够有效地破坏载矿物的晶体结构；强化矿物层间结构中的钪离子被释放，有助于焙烧渣盐酸浸出生成ScCl3，显著提高钪的浸出率。
关键字: 钪；含钪钒钛磁铁矿尾矿；焙烧；浸出
（1. School of Environment and Resources, Southwest University of Science and Technology, Mianyang 621010, China;
2. Sichuan Provincial Engineering Laboratory of Non-Metallic Mineral Powder Modification and High-Value Utilization, Southwest University of Science and Technology, Mianyang 621010, China;
3. Key Laboratory of Sichuan Province for Comprehensive Utilization of Vanadium and Titanium Resources, Panzhihua 617000, China;
4. Key Laboratory of Ministry of Education for Solid Waste Treatment and Resource Recycle, Southwest University of Science and Technology, Miangyang 621010, China）
Abstract:The chlorination roasting and alkali decomposition roasting were used to pre-treat coarse scandium concentrate (Sc2O3 content of 44 g/t) to strengthen the transformation of crystal structure of scandium-bearing minerals and create favorable conditions for further leaching scandium from roasting slag. The results show that scandium leaching efficiency of 84.32% is obtained, and the content of Sc2O3 in the leaching residue is 8.67 g/t under the compressive conditions of alkali decomposition roasting-leaching process as follows: mass ratio of Na2CO3 to coarse of 0.45, roasting temperature of 900 ℃, roasting time of 120 min, hydrochloric acid mass ratio of leaching liquid to solid ratio (R) 5:1, hydrochloric acid concentration of 6 mol/L, two-stage leaching for 240 min. XRD, SEM-EDS and chemical composition analysis results of the leaching residue show that, after leaching, the physical image spectral peaks of pyroxene, hornblende and other aluminate minerals in scandium coarse concentrate disappear, and the spectral peaks of NaCl, CaTiO3 and Fe2O3 appear, and there is no obvious spectral peak of scandium metal. It is also further verified that the alkali decomposition roasting can effectively destroy the crystal structure of the mineral, and the scandium ion in the enhanced interlayer structure of the mineral is released. It is helpful for hydrochloric acid leaching of roasting slag to produce SCCl3 and improve the leaching rate of scandium obviously.
Key words: Sc; Sc-bearing V-Ti magnetite tailings; roasting; leaching
