Comprehensive Utilization of Sulfur Separation Tailings of High Sulfur Rare Metal Complex Ore in Coal Measure
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摘要:
这是一篇冶金工程领域的论文。对重庆某地区煤系高硫稀有金属复合矿选硫尾矿进行综合利用实验研究，为回收铝、硅、稀土、铌等有价元素提供了可行依据。对该选硫尾矿进行了硫酸常压浸出提铝实验，通过条件实验得到适宜浸出条件为：硫酸浓度70%、浸出时间3 h、浸出液固比3、浸出温度≥135 ℃。该条件下Al2O3浸出率可达87.25%。酸浸液可用于制备水处理剂硫酸铝产品；酸浸渣通过NaOH浸出转化后富集硅、稀土、铌等有价元素，可得到SiO2含量达85 g/L以上的碱浸液，用于制取硅酸钠产品；稀土、铌元素经过富集后，在碱浸渣中稀土氧化物（TREO）总量为1820 g/t，Nb含量为274 g/t，可用作回收稀土、铌的原料。
Abstract:This is an essay in the field of metallurgical engineering. Comprehensive utilization of sulfur separation tailings from a coal measure high sulfur rare metal complex ore in Chongqing area was studied, which provided a feasible basis for the recovery of valuable elements such as aluminum, silicon, rare earth and niobium. The experimental results show that the optimum leaching conditions are as follows: sulfuric acid concentration 70%, leaching time 3 h, leaching liquid to solid ratio 3, leaching temperature ≥135 ℃. Under these conditions, the Al2O3 leaching rate can reach 87.25%. Acid leaching solution can be used to prepare aluminum sulfate as a water treatment agent. SiO2 can be obtained from acid leaching residue after enrichment of valuable elements such as silicon, rare earth and niobium by NaOH leaching. The content of more than 85 g/L alkali leaching solution, used for the preparation of sodium silicate products; After enrichment of rare earth and niobium elements, the content of TREO and Nb in alkali leaching residue is 1820 g/t and 274 g/t, which can be used as raw materials for the recovery of rare earth and niobium elements.
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Key words:
- Metallurgical engineering /
- Sulfur tailings /
- Comprehensive utilization /
- Leaching /
- Aluminum sulfate /
- Enrichment
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表 1 选硫尾矿化学多项分析结果/%
Table 1. Chemical multiple analysis results of sulfur tailings
Al2O3 SiO2 TREO* Nb* Fe S TiO2 MgO CaO 31.86 40.65 695 121 2.11 1.75 3.89 0.29 1.64 *单位为 g/t。 
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表 2 硫酸常压浸出综合条件实验结果
Table 2. Test results of comprehensive conditions of sulfuric acid leaching under atmospheric pressure
编号1 编号2 编号3 编号4 酸浸液Al含量/（g/L） 38.56 32.64 34.72 36.36 Al2O3浸出率/% 88.65 86.17 86.32 87.84
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表 3 硫酸铝产品成分分析
Table 3. Composition analysis of aluminum sulfate products
编号5 编号6 编号7 编号8 Al结晶率/% 65.25 57.32 66.90 73.06 Al含量/% 7.57 6.48 6.30 5.35 Fe含量/% 0.17 0.13 0.16 0.12 Mg含量/% 0.04 0.04 0.03 0.03 TREO含量/% <0.01 <0.01 <0.01 <0.01 Nb含量/% <0.01 <0.01 <0.01 <0.01
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表 4 混合母液主要化学成分/（g/L）
Table 4. Main chemical composition of mixed mother liquor
Al TREO* Fe TiO2 H+ 19.19 16.2 2.18 1.66 6.29 *单位为 mg/L。
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表 5 母液循环浸出实验
Table 5. Mother liquor cyclic leaching test
编号9 编号10 尾矿重量/g 70 70 母液用量/mL 157 180 H2SO4用量/mL 57 34 浸出液体积/mL 280 290 浸出液Al含量/（g/L） 39.48 41.84 Al浸出率/% 85.75 85.14
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表 6 酸浸渣的主要化学成分/%
Table 6. Chemical composition of acid leaching residue
Al2O3 SiO2 TREO* Nb* Fe2O3 S TiO2 5.20 66.67 797 161 3.29 4.23 4.25 *单位为：g/t。
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表 7 碱转化渣主要化学成分/%
Table 7. Chemical composition of alkali conversion residue
Al2O3 SiO2 TREO* Nb* Fe2O3 S TiO2 10.36 36.76 1820 274 6.95 5.96 9.44 *单位为：g/t。
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