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最近报道的文献表明 ,微生物有可能作为浮选药剂。本研究将非病源性疏水暗红球细菌 (Rhodococcusopacus,缩写为R opacus)作为赤铁矿 -石英体系中的浮选药剂。对经微生物预处理前后的矿物进行了电泳迁移率测定、接触角测定、扫描电镜分析和微量浮选试验。微生物与矿物的相互作用使得矿物表面化学性质发生明显变化。赤铁矿与石英混合物的微量浮选试验表明 ,通过生物预处理 ,浮选赤铁矿颗粒和抑制石英颗粒是可能的。在所测定的 pH范围内 ,可用DLVO理论解释与生物作用后石英颗粒Zeta电位、接触角和浮选行为的变化。对于赤铁矿 ,该理论仅适于预测在有限的 pH范围内的吸附现象。
Recently reported literature indicates that microorganisms may be used as flotation reagents. In this study, non-pathogenic Rhodococcus opacus (R opacus) was used as a flotation reagent in the hematite-quartz system. The minerals before and after microbial pretreatment were measured by electrophoretic mobility, contact angle, scanning electron microscopy and trace flotation. Interactions between microorganisms and minerals cause significant changes in the surface chemical properties of the minerals. Micro-flotation tests on a mixture of hematite and quartz show that it is possible to float hematite particles and inhibit quartz particles by biological pretreatment. Within the measured pH range, DLVO theory can be used to explain the changes in Zeta potential, contact angle and flotation behavior of quartz particles after biological interaction. For hematite, the theory is only suitable for predicting sorption phenomena over a limited pH range.