鳞片石墨粗磨粗选阶段杂质分布规律研究

Study on Migration Rule of Impurities During Coarse Grinding and Roughing of Flake Graphite

为探究石墨在粗磨粗选过程中杂质分布规律,降低石墨粗精矿中杂质含量,以黑龙江萝北某石墨矿为研究对象,通过磨浮单因素条件试验和显微镜下矿物解离度分析,考察磨矿细度、捕收剂用量及起泡剂用量对石墨粗磨粗选阶段杂质迁移规律的影响。结果表明,磨矿细度增加,石墨单体与脉石有效分离,能减少杂质脉石进入粗精矿,杂质回收率从21.14%降至12.70%;捕收剂用量增加,脉石杂质回收率由4.51%升至10.73%,石墨粗精矿品位降低;起泡剂用量增加能够提高气泡的机械强度,防止气泡兼并,提高石墨的回收率,但起泡剂用量增加,夹带作用增强,细粒杂质脉石的回收率由3.8%升至6%。本研究结果为降低粗磨粗选阶段石墨粗精矿中的杂质含量提供了依据。

In order to investigate the migration rule of gangue mineral in graphite coarse grinding and rougher flotation process to reduce the gangue concentration of the graphite rougher concentrate,a graphite ore from Luobei,Heilongjiang Province was introduced.The effects of grinding fineness,collector dosage and frother dosage on the migration rule were investigated by flotation test and microscope analysis.The results showed that the graphite monomer and gangue were effectively separated by increasing the grinding fineness,which could reduce the impurity gangue entering the coarse concentrate and decrease the gangue recovery rate from 21.14%to 12.70%.With the increase of collector concentration,the recovery rate of gangue mineral increased from 4.51%to 10.73%,and reduced the grade of graphite coarse concentrate.The increase of foaming agent concentration can improve the mechanical strength of bubbles,prevent bubble merger,and improve the recovery rate of graphite,but the gangue recovery rate of finegrained impurity gangue increases from 3.8%to 6%due to the enhanced foam entrainment of fine-grained gangue minerals.The research results provide a scientific basis for reducing the gangue recovery in graphite concentrate during the coarse grinding and roughing flotation.