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本文论述表面力对铁矿高梯度磁力分选影响的实验研究结果。将磨到100微米和40微米以下的纯赤铁矿和赤铁矿石的矿浆在pH1.5～11用磁场强度0.1～0.7泰斯拉的高梯度磁选机处理,其矿物的表面特性随pH而变化。试验数据表明,在与矿物零电点相对应的pH条件下,能够得到矿石中磁性部分的最高品位和最大回收率,而在其它pH值时,品位和回收率均下降。因为氧化铁矿零电点时的pH值与铁矿选矿厂中用水的pH值不同,调整矿浆的pH值可以显著增加品位和回收率。品位和回收率的明显变化可以归因干粒子在聚磁介质上停留的较高几率,沉淀粒子对剪切力的较高抵抗力以及磁性粒子或脉石粒子选择性磁絮凝和离子凝絮。
This paper discusses the experimental results of the effect of surface force on high gradient magnetic separation of iron ore. Pulps of pure hematite and hematite milled to below 100 microns and below 40 microns were treated with a high gradient magnetic separator having a magnetic field strength of 0.1 to 0.7 Tesla at pH 1.5 to 11. The surface properties of the minerals pH. The experimental data show that the highest grade and the highest recovery of the magnetic fraction in the ore can be obtained at the pH corresponding to the zero point of the mineral, while at other pH values and recoveries decrease. Because the pH value at the zero point of the iron oxide is different from the pH value of the water used in the iron ore concentrator, adjusting the pH value of the pulp can significantly increase the grade and the recovery rate. Significant changes in grade and recovery can be attributed to the higher probability that dry particles will stay on the magnetically permeable medium, higher resistance of the precipitated particles to shear forces, and selective magnetic flocculation and ion flocculation of magnetic particles or gangue particles.