细鳞片石墨浮选中擦洗代替再磨工艺试验研究

Research on Technology of Scrubbing Replacing Regrinding in Fine-flaky Graphite Flotation

以江西某地固定碳含量为12.71%的细鳞片石墨为原料,依据矿石的化学成分、XRD物相分析、显微镜分析及嵌布特征等,确定适宜的浮选流程,探究在浮选流程中擦洗代替再磨的可行性和擦洗代替再磨的最佳位置。通过擦洗条件试验确定最佳擦洗条件:擦洗转速2 000 r/min,擦洗浓度20%,擦洗时间30 min。在此基础上进行一系列全流程试验,试验结果表明:擦洗能代替石墨多段再磨—再浮流程中的再磨,擦洗获得的最终石墨精矿固定碳含量94.53%高于再磨的精矿固定碳含量93.16%;证明再磨的作用与擦洗一样,为打散及"清洗",而不是磨矿。通过药剂吸附验证试验及精矿SEM测试进一步证明擦洗对石墨表面的"清洗"。

Taking the fine flake graphite with fixed carbon contents of 12.71% in Jiangxi Province as raw material,according to the chemical composition,XRD phase analysis,microscopic analysis and dissemination characteristics of the ores,the suitable flotation process was determined. And the feasibility of scrubbing instead of regrinding and the best position were analyzed. The optimal scrubbing conditions were determined as scrubbing speed of 2 000 r/min,scrubbing concentration of 20%,scrubbing time of 30 min by scrubbing condition test. On this basis,a series of whole process tests were carried out. The results showed that scrubbing can replace the regrinding in the process of multi-stage regrinding and multi stage flotation. The fixed carbon contents of final graphite concentrate obtained by scrubbing is 94.53%,which is higher than 93.16% of regrinding concentrate. It is proved that the function of regrinding is the same as that of scrubbing,which is to disperse and"clean",not to grind. The chemical absorption test and concentrate SEM test further proved that scrubbing can"clean"the graphite surface.