摘要
采用盐酸浸取攀西高锰稀土矿泥，考察了浸取反应温度、矿石粒度及盐酸浓度对浸取速率的影响. 结果表明，当盐酸浓度为2 mol/L时，浸取过程符合缩核模型，表观活化能为9.59 kJ/mol，属内扩散控制，宏观动力学方程为：K=(4.15(10-4)/r02 · exp(9590/RT); 当盐酸浓度大于2 mol/L时，矿石中的锰被大量浸出，其结构被破坏，浸取过程为混合控制.
The kinetics of leaching RE from Panxi Mn-containing mud with hydrochloric acid was investigated. The effects of reaction temperature, particle size and HCl concentration on the leaching rate were determined. The apparent activation energy is 9.59 kJ/mol as calculated from the experimental data. The results show that the leaching process can be described by the shrinking core model as HCl concentration is below 2.0 mol/L and the leaching rate is controlled by diffusion of reacting reagents and leached products in the porous solid layer. An empirical rate constant of the leaching kinetics is determined to be: when r0 the ore radius is measured in the unit of mm. When HCl concentration is above 2.0 mol/L, the leaching mechanism changes from inner diffusion control to mixed control mechanism because the original ore structure is destroyed.
出处
《过程工程学报》
CAS
CSCD
北大核心
2001年第1期54-57,共4页
The Chinese Journal of Process Engineering
基金
国家杰出青年科学基金资助项目!(编号:59725408)
国家重点自然科学基金资助项目!(编号:59674021
59804004)
