常压碱浸出提硼的工艺研究

Study on process of extracting boron from alkali leaching at atmospheric pressure

含硼尾矿是铁硼镁矿选铁后的尾矿,回收其中的硼元素是目前亟待解决的问题,常压碱浸出提硼工艺有操作安全、无杂质引入的优势。本文采用常压、苛性钠浸出的方法提取硼,研究了浸出温度、时间、碱质量分数、液固比、搅拌速度以及矿样粒度对浸出率的影响。当浸出温度为100℃,时间为4h,碱质量分数为16%,液固比为5∶1,搅拌速度为180r/min,矿样粒度为100目(0.147mm)时,浸取率可达到82.2%左右。

The boron bearing tailing is a kind of tailings after i-ron boron magnesium ore is enriched iron and recovery of boronelement is a problem to be solved currently. The advantage of at-mospheric pressure alkaline leaching process on boron extractingis safe operation without introducing impurities. This paper a-dopts the method of atmospheric pressure and caustic soda leac-hing for extracting boron and studies the influence of leachingtemperature, time, alkali concentration, solid-liquid ratio, rota-tion speed and ore sample particle size on leaching rate. Withtemperature being 100 ℃, time 4 hours, alkali concentration16%, liquid-solid ratio 5 1, stirring speed 180 r/min and oresample size 100 mesh, the leaching rate can be up to 82.2%.