离子吸附型稀土矿再吸附试验研究

Study on Anti-adsorption of Ion Adsorption Type Rare Earth Ore

针对离子型稀土矿原地浸矿中的再吸附问题,进行了实验室条件试验,探讨了离子型稀土矿再吸附存在的条件,提出避免离子型稀土矿浸出再吸附的措施。结果表明稀土母液与稀土矿相互接触越充分,再吸附效果就越好;母液稀土离子浓度升高或母液液固比增大,会使稀土矿再吸附量增大;母液中阳离子离子交换能力大于稀土离子,会抑制稀土矿再吸附,交换能力小于稀土离子,会促进稀土矿再吸附;pH值升高再吸附量先增大后减小。同时,为避免浸出过程再吸附,应该选择合适的浸取剂浓度与液固比。

Focusing on the anti-adsorption in the in-situ leaching of ionic RE mine,laboratory condition tests were carried out. The anti-adsorption conditions of ion adsorption type rare earth ore were discussed,and preventive measures of anti-adsorption were proposed. The results show that full contact of rare earth lixivium with rare earths can promote anti-adsorption;The high concentration of lixivium and the large liquid-solid ratio will increase the anti-adsorption capacity of rare earth mine;When the cation ion exchange capacity is greater than that of rare earth ions,the anti-adsorption will be inhibited,otherwise,it will be promoted; the anti-adsorption will increase first and then decrease with pH increasing. Meanwhile,suitable concentration of leaching agent and liquid-solid ratio should be selected to avoid the anti-adsorption in in-situ leaching.