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离子型稀土在浸出过程中,内部微观的孔隙结构会发生不同程度的变化。采用室内模拟浸矿实验对比分析了纯H_2O和不同浓度的(NH_4)_2SO_4溶液浸出过程中稀土内部孔隙结构的变化规律。实验结果表明:稀土矿体试样浸矿过程孔隙结构随浸矿时间发生变化,主要体现为孔隙率增加,孔隙半径增大。用纯H_2O浸矿时,试样的孔隙率随浸矿时间略有起伏,但总体呈现增大趋势。在有效浸矿时间内,相比纯H_2O,(NH_4)_2SO_4溶液浸出过程矿体试样孔隙率和孔隙半径明显增加,且随着浸矿液浓度增大,变化愈发明显。由此,稀土浸矿过程化学置换反应和溶液渗流过程均可诱发矿体孔隙结构发生变化,在浸出过程中,化学置换反应的影响明显高于溶液渗流。
Ion-type rare earth in the leaching process, the internal microscopic pore structure will occur in varying degrees of change. The indoor simulated leaching experiments were used to compare and analyze the regularity of pore structure changes of rare earths in the process of pure H_2O and (NH_4) _2SO_4 solution leaching. The experimental results show that the pore structure of the ore samples during the leaching process changes with the leaching time, which is mainly reflected by the increase of the porosity and the increase of the pore radius. With pure H_2O leaching, the porosity of the sample slightly changes with the leaching time, but the overall trend of increasing. Compared with pure H 2 O during the leaching time, the porosity and pore radius of (NH 4) 2 SO 4 solution leaching process increased obviously, and the changes became more obvious with the increase of leaching solution concentration. Therefore, both the chemical substitution reaction and solution seepage process in rare earth leaching process can induce the change of pore structure in the ore body. In the leaching process, the effect of chemical substitution reaction is obviously higher than that of solution percolation.