高岭土在La-Al和Y-Al二元体系中的吸附特性

为了解风化壳淋积型稀土矿的成矿过程和浸出回收机制,以典型的粘土矿物高岭土为研究对象,以镧为轻稀土代表、钇为重稀土代表,采用静态吸附实验,考察了高岭土在稀土-铝二元溶液体系中的吸附特性。实验结果表明,稀土-铝二元溶液体系中,高岭土对Al³⁺的吸附量均高于对RE³⁺吸附量;Al³⁺能抑制RE³⁺在高岭土上的吸附,Al³⁺浓度越高影响越大;随着摩尔浓度比(RE³⁺∶Al³⁺)的增加,钇-铝二元溶液体系中Al³⁺吸附量的减少量远高于镧-铝二元溶液体系Al³⁺吸附量的减少量,说明Al³⁺与Y³⁺之间竞争吸附作用强于Al³⁺与La³⁺之间的竞争吸附。

Adsorption Characteristics of Kaoline in La-Al and Y-Al System

To better understand the mineralization of weathered crust elution-deposited rare earth ores and mechanism of leaching process for recovery, a typical clay mineral of kaoline was selected in a static adsorption experiment, with La as representative of light rare earth and Y as representative of heavy rare earth, so as to investigate the adsorption characteristics of kaoline in a binary solution system of rare earth and aluminum. Experimental results showed that in such binary solution, the adsorption of Al³⁺ on  kaoline was higher than the adsorption of RE³⁺. It is shown that Al³⁺ can inhibit the adsorption of RE³⁺ on  kaoline, and also the higher concentration of Al³⁺, the greater inhibiting effect. With the increasing of molar concentration ratio(RE³⁺∶Al³⁺), the decrement of Al³⁺ adsorption in Y-Al binary solution system is much more than that in La-Al system, indicating that the competitive adsorption between Y³⁺ and Al³⁺ is stronger than that between La³⁺ and Al³⁺.