四川黏土型稀土矿钪浸出工艺研究

针对四川黏土型稀土矿中稀土元素、钪含量低，铝和钙含量高，钪元素难以浸出等问题，提出采用碱分解—盐酸浸出工艺来处理该黏土型稀土矿，考察了初始酸度、矿浆液固比、浸出温度和浸出时间等浸出条件对钪浸出的影响。结果表明: 在初始盐酸浓度9 mol/L、矿浆液固质量比2:1、反应温度90 ℃、反应时间60 min的条件下，Sc的浸出率为94%左右，Al、Ca、Fe、Mg和Ti等元素浸出率分别为45%、98%、68%、91%和71%左右，实现了四川黏土型稀土矿中Sc元素的浸出和提取利用。 

Scandium Leaching Technology from Sichuan Clay Type Rare Earth Ore

In view of the existing problems for the Sichuan clay rare earth ore, such as low content of rare earth elements, high content of Al and Ca and difficult in leaching of Sc, a process consisting of alkaline decomposition - hydrochloric acid leaching was adopted in the experiment. The effect of initial acid concentration, liquid to solid ratio, leaching temperature and leaching time on the leaching of Sc was explored. The results show that leaching at a temperature of 90 ℃ for 60 min with an initial hydrochloric acid concentration of 9 mol/L and liquid to solid ratio of 2 : 1 resulted in an average leaching rate of Sc reaching 94%, the total leaching rate of Al, Ca, Fe, Mg and Ti were 45%, 98%, 68% and 71% respectively. This process can realize the leaching, extraction and utilization of Sichuan clay type rare earth ore.