浸矿过程离子型稀土矿孔隙结构演化规律研究

发布时间：2019-07-04 17:02

【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。
文内图片：

图片说明：重塑试样离子浸出过程
[Abstract]:In the leaching process of the ionic rare-earth, the pore structure of the internal microstructure can change different degrees. The variation of the pore structure of the rare-earth element in the leaching process of pure H _ 2O and different concentration of (NH _ 4) _ 2SO _ 4 solution was compared and analyzed by the experiment of indoor simulated leaching. The experimental results show that the pore structure of the ore-leaching process of the ore-leaching process is changed with the time of the leaching, which is mainly reflected in the increase of the porosity and the increase of the pore radius. When the pure H _ 2O is used for leaching, the porosity of the sample has a slight fluctuation with the time of the leaching, but the overall appearance of the sample is increased. Compared with the pure H _ 2O, (NH _ 4) _ 2SO _ 4 solution, the porosity and the pore radius of the ore body are obviously increased during the effective leaching time, and the change is more obvious with the increase of the concentration of the leaching liquid. As a result, the change of the pore structure of the ore body can be induced by the chemical displacement reaction and the solution seepage process in the rare earth leaching process, and the effect of the chemical substitution reaction is obviously higher than that of the solution during the leaching process.
【作者单位】：江西理工大学资源与环境工程学院;江西省矿业工程重点实验室;
【基金】：国家自然科学基金项目(51364011,51564012) 江西省研究生创新专项资金项目(YC2015-S294) 江西省教育厅科学技术研究项目(GJJ150653)资助
【分类号】：TD865

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