某微细粒锂云母选厂尾矿中锂铷的回收试验

Experimental Study on the Recovery of Lithium and Rubidium from Tailings of a Fine-Grained Lepidolite Concentrator

某锂云母选厂尾矿试样中有回收价值的元素锂、铯绝大部分赋存在铯榴石中,铯榴石与云母呈嵌晶状连生,Li2O品位为0.70%,Rb2O品位为0.24%,试样粒度微细,-800目粒级产率高达43.90%,锂在粗粒级有较明显的富集现象。为确定该试样中锂铷的回收工艺,采用预先脱泥—浮选工艺进行了选矿试验。结果表明,试样在添加水玻璃的情况下进行擦洗脱泥(-20μm)预处理,然后在用盐酸调节矿浆pH=3的情况下,采用2次粗选1次精选,可获得Li2O和Rb2O品位分别为2.62%和0.87%,回收率分别为66.47%和64.38%的锂铷精矿,有价成分锂、铷得到了充分的回收。

Lithium and cesium,which deserve to be recovered in the tailings sample of a fine-grained lepidolite concentrator,often exist in pollucite.Pollucite is crystallinely locked with mica,with grade of Li2O 0.70%and Rb2O 0.24%in the sample.The particle size of the sample is fine,and the grain yield of-800 mesh reaches up to 43.90%.Lithium is obviously enriched in coarse grain grade.In order to determine the recovery process of lithium and rubidium in the sample,the dressing test was carried out using the pre-desliming and flotation process.The results showed that the sample was pretreated in scrubbing and desliming(-20μm)with the addition of sodium silicate,and the slurry pH was adjusted to 3 by hydrochloric acid.The lithium-rubidium concentrate,in which the grade of Li2O and Rb2O were 2.62%and 0.87%,respectively,and the recovery rate were 66.47%and 64.38%,respectively,was obtained with two roughing-one cleaning process.The valuable elements,lithium and rubidium,were fully recovered finally.