中文摘要：

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。

英文摘要：

In the ion-type rare earth leaching process,different levels change in the interior micro pore structure will happen. The laboratory simulation leaching was used to study the rule of different concentration ammonium sulfate solution and pure water change on the interior pore structure in the process of leaching. The results showed that the pore structure of rare earth changes from the leaching time in the leaching process,mainly focus porosity and pore radius both increased. By the pure water to leaching,the porosity of the sample shows the ups and downs with the leaching time change,but appears an overall trend of increase. In the effective leaching time,compared with water hydraulic,the porosity and pore radius marked increase in the ammonium sulfate solution leaching process,and the higher concentration the more change obviously. From this the chemical displacement reaction and solutionseepage both induced pore structure change in the leaching process,and also the effect of chemical displacement reaction is significantly higher than the solution seepage.