蛇纹石对黄铁矿浮选的影响及机理

通过浮选实验、沉降实验、显微镜下观测、接触角测试和吸附量实验,研究蛇纹石对黄铁矿浮选的影响,并对其机理进行分析。结果表明：矿物粒度在蛇纹石与黄铁矿的浮选分离中起着重要作用,比黄铁矿粒度小的蛇纹石颗粒能够通过异相凝聚作用吸附在黄铁矿表面,改变黄铁矿的表面性质,影响黄铁矿的浮选。机理研究表明：蛇纹石表面是亲水的且不吸附捕收剂戊黄药(PAX)。蛇纹石吸附在黄铁矿表面,降低了黄铁矿表面疏水性和戊黄药在黄铁矿表面的吸附量,使黄铁矿浮选回收率降低。增加戊黄药在黄铁矿表面的吸附量能够一定程度上恢复被抑制黄铁矿的浮选回收率,但蛇纹石用量较高时,黄铁矿浮选回收率仍降低。因此,微细粒蛇纹石通过异相凝聚作用在黄铁矿表面附着,降低黄铁矿表面疏水性是蛇纹石影响黄铁矿浮选的主要原因。

The effect and mechanism of serpentine interferes with pyrite flotation

The effect of serpentine on pyrite flotation and its mechanism were investigated through flotation experiments, sedimentation tests, optical microscope photos, contact angle measurements and adsorption tests. The results show that the particle sizes play an important role in the flotation separation of pyrite and serpentine. The serpentine particles whose sizes smaller than pyrite particles can attach to pyrite surface through hetero-aggregation and change the surface characteristics of pyrite, thus interfering with the flotation of pyrite. The mechanism studies demonstrate that the surface of serpentine is hydrophilic and can not adsorb PAX. The attachment of serpentine slimes decreased the surface hydrophobicity of pyrite and the adsorption density of PAX, resulting in the decrease of pyrite recovery. The increase of PAX adsorption density on pyrite surface can restore its recovery to some extent, however, the recovery still decrease when the serpentine amount is too large. So it can conclude that the decrease of surface hydrophobicity is the main reason that serpentine interferes with pyrite flotation.