油酸钠体系下细粒赤铁矿精矿过滤影响因素研究

油酸钠浮选的细粒赤铁矿精矿存在过滤困难问题,为找到解决问题的办法,以巴西某细粒赤铁矿精矿(-75μm占96.90%)为研究对象,考察了油酸钠用量、矿浆pH、矿浆温度以及淀粉用量等对赤铁矿精矿过滤效果的影响。结果表明:(1)油酸钠用量对细粒赤铁矿精矿的过滤有显著影响,随着油酸钠用量的增加,赤铁矿精矿滤饼比阻增大。(2)矿浆pH对赤铁矿精矿滤饼比阻的影响较大,强酸性条件能减弱甚至消除油酸钠对赤铁矿精矿过滤的阻碍作用,近中性环境下赤铁矿精矿滤饼比阻变化不大,强碱性条件下赤铁矿精矿的过滤效果变差。(3)矿浆温度对赤铁矿精矿滤饼比阻的影响较小,随着温度的升高滤饼比阻减小。(4)添加少量的淀粉可促进赤铁矿精矿的过滤,过量的淀粉会增大赤铁矿精矿滤饼比阻。

Study on the Influencing Factors for Filtration of Fine-grained Hematite Concentrate in the System of Oleic Acid

It is difficult to filter the fine hematite concentrate with sodium oleate flotation.In order to find a solution to the problem，the effects of the dosage of sodium oleate,pulp pH value,pulp temperature and starch dosage on the filtration effect of hematite concentrates were investigated with a fine hematite concentrate (-75 μm accounting for 96.90%) in Brazil as the object.The results showed that:①The dosage of sodium oleate has a significant effect on the filtration of fine hematite concentrate,and with the increase of the dosage of sodium oleate,the filter cake resistance of hematite concentrate is increased.②The effect of pulp pH value on the specific resistance of hematite concentrates is great,and the strong acidic conditions can weaken or even eliminate the obstruction of sodium oleate to the filtration of hematite concentrates with less variation of filter cake resistance of hematite concentrates in near-neutral environment.The filtration effect of hematite concentrates is worse under strong alkaline conditions.③The pulp temperature has little impact on the filter cake resistance of hematite concentrate,and the cake resistance decreases with the increase of temperature.④Adding a small amount of starch can promote the filtration of hematite concentrate,and excessive starch will increase the filter cake resistance of hematite concentrate.