Leaching of vanadium, sodium, and silicon from molten V-Ti-bearing slag obtained from low-grade vanadium-bearing titanomagnetite
Leaching of vanadium, sodium, and silicon from molten V-Ti-bearing slag obtained from low-grade vanadium-bearing titanomagnetite
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从低品位含钒钛磁铁矿获得的熔融含钒钛矿渣中浸出钒、钠和硅
DOI：
10.1007/s12613-016-1305-1
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发表时间：
2016
影响因子：
4.8
通讯作者：
Qi Tao
中科院分区：
文献类型：
--
作者：
Zhu Yuan-yuan;Yi Ling-yun;Zhao Wei;Chen De-sheng;Zhao Hong-xin;Qi Tao
系统地研究了从低品位钒钛磁铁矿熔融钒钛渣中浸取钒、钠和硅的工艺。结果表明，熔融钒钛渣的主要成分为钛酸钙、铝硅酸钠、氧化钠、二氧化硅和钒酸钠。实验结果表明，液固（L/S）质量比显着影响浸出过程中，由于各自的溶解度和扩散速率的组分。在粒度小于0.074 mm、浸出温度90°C、浸出时间20 min、液固质量比4：1的条件下，采用三重逆流浸出工艺，钒、钠和硅的浸出率分别为83.8%、72.8%和16.1%。1,钒的浸出动力学可用内扩散模型来描述。控制模型，表观活化能为11.1kJ/mol。并对钒的浸出机理进行了分析。
The water leaching process of vanadium, sodium, and silicon from molten vanadium-titanium-bearing (V-Ti-bearing) slag obtained from low-grade vanadium-bearing titanomagnetite was investigated systematically. The results show that calcium titanate, sodium aluminosilicate, sodium oxide, silicon dioxide and sodium vanadate are the major components of the molten V-Ti-bearing slag. The experimental results indicate that the liquid-solid (L/S) mass ratio significantly affects the leaching process because of the respective solubilities and diffusion rates of the components. A total of 83.8% of vanadium, 72.8% of sodium, and 16.1% of silicon can be leached out via a triple counter-current leaching process under the optimal conditions of a particle size below 0.074 mm, a temperature of 90°C, a leaching time of 20 min, an L/S mass ratio of 4:1, and a stirring speed of 300 r/min. The kinetics of vanadium leaching is well described by an internal diffusion-controlled model and the apparent activation energy is 11.1 kJ/mol. The leaching mechanism of vanadium was also analyzed.