The use of high-concentration ammonium sulfate leaching agent for the mining of ion-absorbed rare earth ore will change the soil environment properties, thereby inducing the release of associated heavy metals. Serious manganese pollution has been observed in the environment of rare earth mining areas, but the environmental chemical process of manganese in the raw ore soil has not been fully recognized. In this study, a sequential extraction experiment showed that the manganese in the soil included acid extractable form, reducible form, oxidizable form, and residual form, among which residual form and reducible form were the main forms. According to the release kinetics experiment, the release process of manganese included the fast release and slow release, which was controlled by multiple diffusion mechanisms and could be optimally fitted with the Elovich equation. The treatment of ammonium sulfate leaching agent could reduce the proportion of reducible form and increase the proportion of residual form, but there was no significant change in other forms. In addition, batch release experiments indicated that leaching factors (the initial concentration and initial pH of leaching agent, and temperature) could affect the release of manganese. Lower pH and higher temperature were not conducive to the stability of manganese and significantly aggravated the release amount. Excessive initial concentration had a certain inhibitory effect on the release amount, but the effect was weak. Considering the significant effect of initial pH and temperature on the release of manganese, during the mining process of ion-absorbed rare earth, controlling the initial pH of leaching agent and reducing the mining scale in the hot summer are the key measures to manage the release risk of manganese.

将高浓度硫酸铵浸出剂用于离子吸收稀土矿的开采将改变土壤环境特性，从而诱导相关重金属的释放。在稀土矿区的环境中已观察到严重的锰污染，但尚未完全认识到原矿土壤中锰的环境化学过程。在这项研究中，顺序提取实验表明土壤中的锰包括酸可提取形式，可还原形式，可氧化形式和残留形式，其中残留形式和可还原形式是主要形式。根据释放动力学实验，锰的释放过程包括快速释放和缓慢释放，它由多种扩散机制控制，可以与Elovich方程进行最佳拟合。硫酸铵浸出剂的处理可以减少可还原形式的比例，增加残留形式的比例，但其他形式没有明显变化。此外，分批释放实验表明，浸出因子（浸出剂的初始浓度和初始pH值以及温度）可能会影响锰的释放。较低的pH值和较高的温度不利于锰的稳定性，并显着加剧了释放量。初始浓度过高对释放量有一定的抑制作用，但作用较弱。考虑到初始pH和温度对锰释放的显着影响，