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以催化废水治理产生的污泥为原料,用盐酸浸出污泥中的稀土,进行了浸出酸度、固液比、浸出温度等条件对浸出率的影响以及稀土浸出过程中动力学研究,结果表明,浸出酸度、固液比对稀土浸出率影响较大,温度的影响较小,在初始的30 min内,盐酸浸出污泥的反应已经完成,在随后的时间内,污泥的反应虽然仍在进行,但是浸出率的增加极小,固定盐酸的浓度为2 mol/L时,浸出反应的浸出过程受到固体内扩散的控制,反应的表观活化能为4.11 k J/mol。
The effects of leaching acidity, solid-liquid ratio and leaching temperature on the leaching rate and the kinetics of the rare earth leaching process were studied by using sludge produced by the catalytic wastewater treatment as the raw material and hydrochloric acid leaching the rare earth in the sludge. Leaching acidity and solid-liquid ratio had a great influence on the leaching rate of rare earth, and the influence of temperature was small. The reaction of hydrochloric acid leaching sludge was completed within the initial 30 min. At the following time, the reaction of sludge was still underway , But the increase of leaching rate was very small. When the concentration of hydrochloric acid was 2 mol / L, the leaching reaction was controlled by intra-solid diffusion, and the apparent activation energy was 4.11 kJ / mol.