某选矿厂工业回水中离子对黄铁矿浮选的影响机制

发布时间：2018-05-12 02:01

本文选题：回水 + 黄铁矿　；参考：《稀有金属》2017年07期

【摘要】：通过黄铁矿纯矿物浮选实验、紫外分光光度计(UV-Vis)分析、Zeta电位测定和傅里叶变换红外光谱(FT-IR)分析研究了工业回水中超标离子(NH+4,Mg~(2+),Ca~(2+),F-)对黄铁矿浮选的作用机制。结果表明,回水中NH_4~+可以提高矿物表面的电位,扩大黄铁矿浮选的pH值范围,红外光谱表明其能促进黄铁矿与黄药发生化学吸附,且矿物表面黄药吸附量随着NH+4的增加而增加,经NH_4~+活化后,黄铁矿浮选回收率提高15.5%。而回水中Ca~(2+),Mg~(2+),F-会抑制黄铁矿对黄药的吸附,浮选回收率平均下降10%。其中,Ca~(2+),Mg~(2+)在黄铁矿表面易形成亲水膜,阻碍黄铁矿对黄药的表面吸附;Zeta电位测试发现F-吸附在矿物表面导致矿物表面带负电,与同为阴离子的黄原酸根离子形成竞争吸附,减少了黄原酸盐在黄铁矿表面的吸附量,降低了其可浮性。
[Abstract]:Based on the flotation experiments of pure pyrite minerals, the determination of Zeta potential by UV spectrophotometer and the analysis of FT-IRs by Fourier transform infrared spectroscopy (FTIR), the mechanism of the action of the over-standard ion (NH _ 4H _ 4H _ 2O _ 2) on the flotation of pyrite has been studied. The results show that NH _ 4- can increase the potential of mineral surface and enlarge the pH range of pyrite flotation. The infrared spectrum shows that it can promote the chemical adsorption of pyrite and xanthate. The amount of xanthate adsorbed on mineral surface increased with the increase of NH _ 4. After NH _ 4 ~ activation, the flotation recovery rate of pyrite increased by 15.5g. However, the adsorption of pyrite to xanthate was inhibited by Ca~(2. The average recovery rate of flotation decreased by 10%. The hydrophilic membrane is easily formed on the surface of pyrite, which hinders the adsorption of xanthate on the surface of pyrite by Zeta potential test. It is found that the adsorption of F- on the mineral surface leads to negative charge on the surface of the mineral, which forms a competitive adsorption with the anion xanthate ion. The amount of xanthate adsorbed on the surface of pyrite was reduced, and the floatability of xanthate was decreased.
【作者单位】：内蒙古科技大学白云鄂博矿多金属资源综合利用重点实验室;内蒙古科技大学矿业研究院;
【基金】：内蒙古自然科学基金项目(2015MS0559,2014MS0521)资助
【分类号】：TD923;TD951

【相似文献】