铁离子淀粉配合物在某铁矿石反浮选中的抑制行为及机理

发布时间：2018-05-07 03:13

本文选题：苛性淀粉 + 铁离子淀粉配合物　；参考：《金属矿山》2017年11期

【摘要】：将苛性淀粉溶液和三价铁离子溶液调配成铁离子淀粉配合物溶液,以其和苛性淀粉为抑制剂,考察他们在铁矿石反浮选中对铁矿物的抑制性能,并从动电位和红外光谱角度分析了抑制剂与赤铁矿和石英的作用情况。试验表明:(1)铁离子淀粉的抑制能力和选择性皆优于苛性淀粉。(2)在矿浆p H为中性、铁离子淀粉用量为1 000 g/t、十二胺用量为400 g/t情况下,采用1次粗选流程处理铁品位为20.50%的巴西某矿石,可得到铁品位为46.79%、铁回收率为79.36%的铁精矿,该指标明显优于苛性淀粉用量为1 000 g/t时的指标。(3)动电位测试表明,铁离子淀粉和苛性淀粉对赤铁矿都有较强的吸附作用,使赤铁矿动电位负值增大,但铁离子淀粉对石英表面动电位的影响明显小于苛性淀粉,因而铁离子淀粉在浮选中表现出更好的选择性抑制效果。(4)红外测试表明,铁离子淀粉中淀粉分子主要通过C=O与铁离子发生配位作用,同时也存在一定的氢键作用,β-Fe OOH特征吸收峰的出现,说明铁离子淀粉可能是以β-Fe OOH为胶核,淀粉分子通过配位和氢键作用吸附在胶核表面形成配合物,对十二胺在赤铁矿表面吸附具有更强的空间阻碍作用,抑制性能更好。
[Abstract]:Iron ion starch complex solution was prepared from caustic starch solution and trivalent iron ion solution. The inhibition of iron ore in reverse flotation of iron ore was investigated by using caustic starch and caustic starch as depressants. The interaction of the inhibitor with hematite and quartz was analyzed from the angle of dynamic potential and infrared spectrum. The results showed that the inhibition ability and selectivity of iron ion starch were better than that of caustic starch. 2) when pH was neutral, the amount of iron ion starch was 1 000 g / t, and the amount of dodecylamine was 400 g / t. The iron concentrate with iron grade of 46.79 and iron recovery of 79.36% can be obtained by treating a Brazilian ore with a iron grade of 20.50% by one rough separation process. This index is obviously superior to that of the indicator of 1 000 g / t of caustic starch. The result of dynamic potential test shows that the iron concentrate with iron grade is 46.79 and the iron recovery rate is 79.36%, which is obviously superior to that of draconian starch at 1 000 g / t. Iron ion starch and caustic starch have strong adsorption on hematite, which increase the negative value of hematite dynamic potential, but the effect of iron ion starch on surface dynamic potential of quartz is obviously smaller than that of caustic starch. Therefore, iron ion starch showed a better selective inhibition effect in flotation. The IR test showed that the starch molecule in iron ion starch coordinated with iron ion mainly through Con O. At the same time, there is a certain hydrogen bond, the characteristic absorption peak of 尾 -Fe OOH appears, which indicates that the iron ion starch may be 尾 -Fe OOH as the gel core, and the starch molecule adsorbed on the surface of the gel core through coordination and hydrogen bonding to form the complex. The adsorption of dodecylamine on hematite surface has stronger space hindrance and better inhibition performance.
【作者单位】：中南大学资源与生物工程学院;
【基金】：国家自然科学基金项目(编号:51274256)
【分类号】：TD923.14;TD951

【相似文献】