粗粒浮选法回收盐湖钾盐的研究

盐湖中含有大量的钾盐,但是由于钾的含量过低,不能直接用于农业生产。传统方法回收钾盐主要是通过离子交换法以及结晶—磨矿—浮选,但是该法在提取钾盐过程中,产生大量细粒的精矿,产品不容易干燥,生产成本高,限制了盐湖钾盐的利用。在本试验研究中,采用粗粒浮选法回收盐湖钾盐,经过结晶的钾盐直接进入浮选,无须磨矿过程,避免产生细粒钾盐产品。在研究过程中,采用新的钾盐浮选抑制剂HY进行试验。最优的试验条件为:浮选矿浆浓度为50%,十六胺用量90 g/t,淀粉用量300 g/t,HY用量15 g/t,得到品位为32.97%、回收率高达84.23%的氯化钾精矿。

Research on the extraction potassium from bittern with coarse particle flotation method

Potassium occurs in vast quantities of bittern, but its average concentration is too low to use in agriculture directly. Previous works of the potassium recovery from bittern have been predominantly in the conventional processes of evaporation-crystallization-flotation and ion exchange. But these processing shortcomings are low recovery, fine product and high cost, which limits the potassium industry developing. In this paper, the coarse particle flotation method is evaluated. The new potash ore depressant HY is developed. The optimum conditions are the pulp concentration 40%, starch dosage 600 g/t, HY depressant 60 g/t and the pH 6. More than 85% potassium is recovered, the K grade is about 18%, which can be used in the agriculture as fertilizer.