药剂的磁化处理对赤铁矿浮选的影响及机理研究

为进一步明确磁化处理对浮选效果的影响规律及作用机理,以赤铁矿及石英为主要研究对象,探究磁感应强度、磁化时间、磁场位型等磁化处理工艺参数对浮选指标的影响,同时采用表面张力测试、电导率测试、Zeta 电 位分析等测试手段,从磁化处理对药剂与矿物的作用方面揭示了磁化处理药剂的作用机理。 在磁感应强度 150 mT、 磁化时间 6 min、1 号磁场位型(磁场梯度较高)的条件下磁化处理浮选药剂,赤铁矿回收率提高至 78. 27%,相较未磁化条件下,增加了 23. 62 个百分点;而石英回收率则基本不变,维持在较低水平。人工混合矿试验结果表明,在精矿 TFe 品位相近的情况下,磁化处理后精矿 TFe 回收率提高了 6. 75 个百分点。 磁化处理后溶液中油酸钠离子浓度增加,油酸根离子在赤铁矿表面的吸附增强,有利于赤铁矿和石英的浮选分离。研究结果对磁化浮选理论体系的建立有一定意义,可为磁化处理在赤铁矿浮选中的应用提供参考。

Effect of Reagents Magnetization Treatment on Hematite Flotation and Its Mechanism

In order to indentify the influence law and action mechanism of magnetization treatment on flotation effect,taking hematite and quartz as the main research object,the effects of magnetization treatment process parameters such as magnetic induction intensity,magnetization time,magnetic field position on the flotation indexes were investigated. Meanwhile,the action mechanism of reagent magnetization treatment was revealed from the effect of magnetization treatment on reagents and minerals by using surface tension test,conductivity test,Zeta potential test and other test methods. Under the conditions of magnetic induction strength of 150 mT,magnetization time of 6 min,and No. 1 magnetic field position (high magnetic field gradient),the flotation reagent was magnetized. The recovery rate of hematite was increased to 78. 27%,increased by 23. 62 percentage points compared with unmagnetized reagent. While the recovery rate of quartz almost unchanged and maintained lower level. The test results of the artificial mixed ore showed that with the similar TFe grade,the TFe recovery rate increased by 6. 75 percentage points when the flotation reagent was magnetized. The concentration of sodium oleate ions in the solution increases after magnetization treatment,and the adsorption of oleate ions on the surface of hematite is enhanced,which is conducive to the flotation of hematite. The research results have certain significance for the establishment of magnetization flotation theory system,and can provide reference for the application of magnetization treatment in hematite flotation.