包钢稀土选矿厂稀土浮选药剂优化

Optimization of Floatation Reagents for Rare Earth Ore in Dressing Plant of Bayan Obo Rare Earth Ore

白云鄂博包钢稀土选矿厂的脉石矿物由于受到金属离子的活化,使1粗2精浮稀土流程不能形成闭路(中矿返回会影响浮选系统的稳定),生产指标不理想。为解决生产流程稳定性差、生产指标不理想的问题,对现场浮稀土给矿进行了药剂优化试验。结果表明,柠檬酸+水玻璃为脉石矿物的组合抑制剂,可有效消除金属离子对脉石矿物的活化;在柠檬酸+水玻璃用量为200+1 500 g/t情况下,采用1粗2精、中矿顺序返回流程处理试样,可获得ReO品位为51.32%、回收率为70.94%的稀土精矿,比现场稀土精矿ReO品位提高了1.32个百分点,回收率提高了15.91个百分点。

Due to effect of the activation of metal ions on gangue minerals in Bayan Obo rare earth dressing plant,the flotation process of one-roughing and two-cleaning can not form a closed-circuit flow-sheet,leading to an unfavorable flota- tion index （middies return makes the flotation system difficult to keep stable）. In order to solve the problems of poor stabil- ity in production process and undesirable production index ,optimization tests of reagents for the on-site rare earth floatation were made. The results showed that the combining inhibitors of citric acid and sodium silicate of gangue minerals can effec- tively eliminate the activation of metal ions on gangue minerals ; With the usage of citric acid and sodium silicate at 200 ＋ 1 500 g/t ,rare earth concentrate with ReO grade of 51.32% and recovery of 70.94% was obtained by adopting the process of one-roughing,two-cleaning and middles back to the flow-sheet in turn. Compared with on-site index, ReO grade and re- covery rate were increased by 1.32 percentage point and 15.91 percentage point respectively.