离子型稀土矿浸矿过程的线性可逆动态吸附模型

Linear reversible dynamic adsorption model for leaching process of ion-adsorption type rare earth ore

以硫酸铵为浸取剂,对离子型稀土矿进行不同硫酸铵浓度、不同粒级的动态浸出试验。结果表明:相同反应时间下,硫酸铵浓度越高,液相稀土离子浓度越高;随着反应时间的增加,稀土离子浓度先迅速升高,后趋于稳定。将离子交换过程分解为固相稀土离子的解吸和液相铵根离子的吸附两个过程,采用线性可逆动态吸附模型描述液相铵根离子的吸附过程,并考虑固相稀土离子的解吸对液相铵根离子吸附的影响,建立了离子型稀土矿浸矿过程的线性可逆动态吸附模型。结合试验数据,发现模型中参数λ1随着硫酸铵浓度的升高而减小。

With the ammonium sulfate as leaching agent,the dynamic leaching experiments of ion-type rare earth ores with different ammonium sulfate concentration and particle size are carried out.The results show that the higher concentration of ammonium sulfate,the higher concentration of rare earth ions in the liquid phase.With the increase of reaction time,the concentration of rare earth ions first increase rapidly and then tend to be stable.The ion exchange process is decomposed into the process of desorption of solid rare earth ions and adsorption of liquid ammonium ions.The linear reversible dynamic adsorption model is used to describe the adsorption process of ammonium ion in liquid phase,and the effect of desorption of rare earth ions on the adsorption of ammonium ion in liquid phase is considered.Combined with the experimental data,it is find that the λ 1 of the model decreases with the increase of ammonium sulfate concentration.