(1. 西南科技大學(xué) 環(huán)境與資源學(xué)院，綿陽 621010；
2. 西南科技大學(xué) 四川省非金屬礦粉體改性與高質(zhì)化利用工程實(shí)驗(yàn)室，綿陽 621010；
3. 四川省釩鈦資源綜合利用重點(diǎn)實(shí)驗(yàn)室，攀枝花 617000；
4. 西南科技大學(xué) 固體廢物處理與資源化利用教育部重點(diǎn)實(shí)驗(yàn)室，綿陽 621010)
摘 要: 采用氯化焙燒和堿分解焙燒方法預(yù)先處理鈧粗精礦(Sc2O3 44 g/t)，強(qiáng)化載鈧礦物晶體結(jié)構(gòu)的轉(zhuǎn)變，為焙燒渣進(jìn)一步浸出分離鈧創(chuàng)造有利條件。結(jié)果表明：在Na2CO3和鈧粗精礦質(zhì)量比為0.45、焙燒溫度為900 ℃、焙燒時(shí)間為120 min、鹽酸浸出液固質(zhì)量比(mliquid:msolid) R=5:1、鹽酸濃度為6 mol/L的條件下兩段浸出240 min，鈧的浸出率為84.32%，浸出渣中Sc2O3含量為8.67 g/t。浸出渣的XRD、SEM-EDS及化學(xué)成分分析結(jié)果表明：浸出后鈧粗精礦中的輝石類、角閃石等硅鋁酸鹽礦物物相譜峰消失，出現(xiàn)NaCl、CaTiO3、Fe2O3的譜峰，未見明顯金屬鈧的譜峰，也進(jìn)一步驗(yàn)證堿分解焙燒能夠有效地破壞載礦物的晶體結(jié)構(gòu)；強(qiáng)化礦物層間結(jié)構(gòu)中的鈧離子被釋放，有助于焙燒渣鹽酸浸出生成ScCl3，顯著提高鈧的浸出率。
關(guān)鍵字: 鈧；含鈧釩鈦磁鐵礦尾礦；焙燒；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
