武汉工程大学学报2024，Vol.46Issue(4)：417-423,7.DOI:10.19843/j.cnki.CN42-1779/TQ.202404035
乙酸铵助浸风化壳淋积型稀土矿过程研究
Leaching process of weathered crust elution-deposited rare earth ore assisted by ammonium acetate
摘要
Abstract
In light of a series of issues such as low leaching efficiency of rare earth,poor leaching effect of medium and heavy rare earth,high impurity aluminum in rare earth leaching solution,and high clay mineral swelling ratio in the current leaching process of weathered crust elution-deposited rare earth ore,we used 0.20 mol/L ammonium sulfate as the leaching agent and ammonium acetate as the assisting leaching agent to explore the synergy of ammonium acetate on the rare earth leaching process and the swelling properties of clay minerals.The results show that the optimal assisted leaching concentration of ammonium acetate is 0.04 mol/L,under which the leaching efficiency of rare earth increases by 4.81%,the leaching efficiency of impurity aluminum decreases by 48.66%,and the total concentration of rare earth increases by 45.18 μg/g.The concentration of light rare earth decreases by 27.26 μg/g,and that of medium and heavy rare earth increases by 72.44 μg/g,indicating that ammonium acetate enhances the leaching of medium and heavy rare earth.Meanwhile,the swelling ratio of clay mineral is 2.951%,and the expansion rate is reduced by 1.298%compared with that of ammonium sulfate as a single leaching agent.With the change of the concentration of ammonium acetate,the leaching efficiency of rare earth is positively proportional to the change of Zeta potential,and the swelling ratio of clay minerals is inversely proportional to the change of Zeta potential.When the concentration of ammonium acetate is 0.04 mol/L,the Zeta potential on the surface of clay minerals is-18.26 mV.For the leached tailings,the leached tailings with ammonium acetate added have better anti-swelling performance,and the swelling ratio is only 2.054%.This study provides some beneficial guidance for the efficient in-situ leaching of rare earth from weathered crust elution-deposited rare earth ores.关键词
风化壳淋积型稀土矿/乙酸铵/助浸/浸出率/膨胀Key words
weathered crust elution-deposited rare earth ore/ammonium acetate/assisted leaching/leaching efficiency/swelling分类
矿业与冶金引用本文复制引用
陈文斗,张臻悦,龙菲,池汝安,陈卓..乙酸铵助浸风化壳淋积型稀土矿过程研究[J].武汉工程大学学报,2024,46(4):417-423,7.基金项目
国家自然科学基金(52304293、52222405、92162109、52074195) （52304293、52222405、92162109、52074195）
