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首页> 外文期刊>Separation and Purification Technology >Recovery of chromium and magnesium from spent magnesia-chrome refractories by acid leaching combined with alkali precipitation and evaporation
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Recovery of chromium and magnesium from spent magnesia-chrome refractories by acid leaching combined with alkali precipitation and evaporation

机译：通过酸性浸出与碱沉淀和蒸发相结合废镁铬镍耐火材料的铬和镁回收铬和镁

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In this study, recovery of chromium and magnesium from spent magnesia-chrome refractories was developed by acid leaching combined with alkali precipitation and evaporation. The optimized conditions for leaching were found to be particle size of -74 + 38 mu m, hydrochloric acid solution of 5.0 mol/L, liquid-solid ratio of 5:1, leaching temperature of 343 K, leaching time of 90 min and agitation speed of 400 rpm. Under these conditions, 95.14% Cr was remained in the residual in the form of chromite, which could be directly used for metallurgy. Subsequently, more than 90% Cu, Pb, Bi and Si can be removed from the leachate through adjusting the pH to 7.0 by magnesium hydroxide. Then, magnesium chloride hexahydrate can be obtained from the final solution by evaporation. Detection analyses showed that the production of chromite and magnesium chloride hexahydrate could be used as industrial raw material. What's more, kinetics of magnesium leaching was also studied, and the results revealed that leaching magnesium from the spent magnesia-chrome refractories was in accordance with pseudo-second-order model and the corresponding apparent activation energy was 68.75 kJ/mol.
机译：在本研究中，通过酸浸出结合碱沉淀和蒸发，通过Choppentia-Chrome Remractions的铬和镁从废镁铬镍氢恢复。发现浸出的优化条件为-74 +38μm，盐酸溶液为5.0mol / l，液态比为5：1，浸出温度为343k，浸出时间为90分钟，搅拌400 rpm的速度。在这些条件下，95.14％Cr以铬铁矿形式残留在残留物中，其可直接用于冶金。随后，可以通过氢氧化镁将pH调节至7.0，从浸出物中除去超过90％Cu，Pb，Bi和Si。然后，通过蒸发从最终溶液中获得氯化镁六水合物。检测分析表明，铬铁矿和氯化镁六水合物的生产可用作工业原料。更重要的是，还研究了镁浸出的动力学，结果表明，来自废镁铬镍耐火材料的浸出镁根据伪二阶模型，相应的表观活化能量为68.75 kJ / mol。

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