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首页> 外文期刊>Journal of industrial and engineering chemistry >Leaching of rare earth metals (REMs) from Korean monazite concentrate
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Leaching of rare earth metals (REMs) from Korean monazite concentrate

机译:从韩国独居石精矿中浸出稀土金属(REM)

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摘要

Systematic scientific studies for dephosphorization and acid leaching of Korean monazite are reported here. 50% NaOH (w/v) solubilizes 99.99% phosphate, at 170 °C, 100 g/L pulp density in 4 h. Kinetics of phosphate leaching fitted well with model "chemical reaction control," i.e. 1-(1-X)1/2 = fcct, E_a = 58.04 kJ/mol. Further, rare earth hydroxides (REHs) was leached using 6N HCl at 90 °C, 60 g/L pulp density for 2 h to recover ~95% REMs. Leach liquor generated can be further processed using solvent extraction/ion exchange techniques. From the pure solutions, metal/salts could be obtained using evaporation, precipitation, etc.
机译:本文报道了韩国独居石的脱磷和酸浸的系统科学研究。 50%NaOH(w / v)在170°C下可在4小时内溶解99.99%的磷酸盐,纸浆密度为100 g / L。磷酸盐浸出的动力学与模型“化学反应控制”非常吻合,即1-(1-X)1/2 = fcct,E_a = 58.04 kJ / mol。此外,使用6N HCl在90°C,60 g / L纸浆密度下浸提稀土氢氧化物(REHs)2小时,以回收〜95%REM。产生的浸出液可以使用溶剂萃取/离子交换技术进一步处理。从纯溶液中,可以使用蒸发,沉淀等方法获得金属/盐。

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