原地浸矿经验注液下离子型稀土残留规律

Law of ionic rare earth residue under in-situ leaching empirical injection

离子型稀土总浸出率受水溶相、离子相和胶态相稀土浸出率的影响。为进一步提高离子型稀土总浸出率,本文以福建某离子型稀土矿为原料,分步解吸测量其原矿、尾矿中水溶相、离子相和胶态相稀土品位,并运用描述性统计对解吸测量结果进行归纳分析,可以得出:1)离子相浸出率η_(I)>总浸出率η_(T)>胶态相浸出率η_(C)>水溶相浸出率η_(W);2)随矿土深度增加,尾矿中稀土总残留量呈递增状态;3)胶态相稀土残留影响系数k_(C)(5.84)大于离子相稀土的k_(I)(0.88),说明胶态相稀土存在可开发空间。通过研究尾矿中矿体pH值与胶态相稀土残留量的关系,发现两者呈正相关性;当pH>5.1时,随pH值的增加,胶态相稀土残留量显著增大,并通过溶度积和共沉淀原理对该现象进行了机理分析,为进一步提高稀土总浸出率提供研究方向。

The total leaching rate of ionic rare earth is affected by the leaching rate of water-soluble phase,ionic phase and colloidal phase rare earth.In order to further improve the total leaching rate of ionic rare earth,this paper takes an ionic rare earth ore in Fujian as raw material,and measures the rare earth grade of water-soluble phase,ionic phase and colloidal phase in raw ore and tailings by step-by-step desorption.The results of desorption measurement was summarized and analyzed by descriptive statistics.It can be concluded that:1)ionic phase leaching rate(η_(I))>total leaching rate(η_(T))>colloidal phase leaching rate(η_(C))>water-soluble phase leaching rate(η_(W));2)with the increase of soil depth,the total residual amount of rare earth in tailings increases;3)Regarding the residual influence coefficient,k_(C)(5.84)of the colloidal phase rare earth is greater than k_(I)(0.88)of the ionic rare earth,indicating that the colloidal phase rare earth has tendency for development.By studying the relationship between the pH value of ore in the tailings and the residual amount of rare earth in the colloidal phase,this will prove that there is a positive correlation between the two factors;when pH>5.1,the residual amount of rare earth in colloidal phase increases significantly with the increase of pH value.The mechanism of this phenomenon was analyzed by solubility product and co-precipitation principle,which provides a research direction for further improving the total leaching rate of rare earth.