离子型稀土浸矿过程渗透性变化规律研究

发布时间：2018-12-17 23:01

【摘要】：为了解离子型稀土浸矿过程中浸矿效果与矿体渗透性的关系,利用自制浸矿过程渗透系数测定装置进行了矿体渗透系数测定试验,研究了离子交换条件下试样渗透系数的变化规律及形成机理,分析了初始渗透性对渗流规律的影响。研究表明:清水浸矿,孔隙内可运移颗粒向下迁移,有效渗流孔径逐步增大,进而试样渗透性逐步增强;(NH_4)_2SO_4溶液浸矿,在强阳离子结合水层的黏滞阻碍作用下,试样渗透系数随浸矿时间延长呈先下降后上升的趋势。pH测试识别模式可用于(NH_4)_2SO_4溶液浸矿全过程反应强度的识别,pH试纸显色为强酸性对应稀土阳离子的大量浸出,此区间的渗透性系数最小;浸出后期pH试纸显色为弱酸性则对应残余浸出反应阶段。初始渗透性各异的试样清水浸矿阶段的渗透系数变化幅度基本相同;(NH_4)_2SO_4溶液浸矿阶段,渗透系数变化趋势出现明显的差异,初始渗透系数大的试样渗透系数变化幅度最大,初始渗透系数最小的试样渗透系数变化幅度最小。对初始渗透性较差的矿体,应先用清水浸矿再用(NH_4)_2SO_4溶液浸矿。
[Abstract]:In order to understand the relationship between the leaching effect and the permeability of ore body during the leaching process of ion type rare earth, the permeability coefficient of ore body was measured by using a self-made apparatus for determining the permeability coefficient of ore body. The variation law and formation mechanism of the permeability coefficient of the sample under ion exchange conditions were studied and the influence of initial permeability on the seepage law was analyzed. The results show that when the ore is leached in clean water, the movable particles in the pores move downward, the effective percolation pore size increases gradually, and the permeability of the sample increases gradually. (NH_4) _ 2SO_4 solution leaching, under the strong cationic binding water layer viscosity barrier, The permeability coefficient of the sample decreased first and then increased with the prolongation of leaching time. PH test and identification model can be used to identify the reaction strength of (NH_4) _ 2SO_4 solution during the whole leaching process. The color of pH test paper is strong acid corresponding to rare earth cation leaching, the permeability coefficient of this region is the smallest; In the later stage of leaching, the color of pH test paper is weak acid, which corresponds to the residual leaching reaction stage. The change range of permeability coefficient of samples with different initial permeability is basically the same at the stage of clean water leaching. In the leaching stage of (NH_4) _ 2SO_4 solution, the change trend of permeability coefficient is obviously different. The sample with large initial permeability coefficient has the largest change range, and the sample with the smallest initial permeability coefficient has the smallest change range. For the orebodies with poor initial permeability, the solution of (NH_4) _ 2SO_4 should be used to leach the ore with clean water and then with (NH_4) _ 2SO_4 solution.
【作者单位】：江西理工大学资源与环境工程学院;
【基金】：国家自然科学基金项目(编号:51364011) 江西省教育厅科技项目(编号:GJJ150653) 江西省研究生创新专项基金项目(编号:YC2016-S320)
【分类号】：TD865

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