羧甲基淀粉取代度对抑制赤铁矿影响

以木薯淀粉和四种不同取代度羧甲基淀粉(CMS)为抑制剂,研究了油酸钠体系中赤铁矿和石英的可浮性以及原淀粉和CMS对赤铁矿和石英的选择性抑制作用。通过纯矿物的单矿物和人工混合矿试验研究得出:原淀粉、CMS对赤铁矿都有很好的抑制作用,取代度0.0497CMS对赤铁矿的抑制效果最好;在pH值为11.80、氯化钙浓度40 mg/L、CMS浓度2 mg/L、油酸钠浓度为150 mg/L的条件下,获得的铁精矿品位为66.35%、回收率为95.86%。并且通过红外光谱、Zeta电位测试以及XPS光谱分析表明,抑制剂CMS在赤铁矿表面产生了吸附,从而使赤铁矿受到抑制。

Effect of substitution degree of carboxymethyl starch on inhibition of hematite

With cassava starch and four kinds of different substitution degree of carboxymethyl starch (CMS) as depressant,in this paper,the flotation performances of sodium oleate on hematite and quartz,and the selective inhibition of raw starch and CMS on hematite and quartz are investigated. The flotation experimental results of single minerals and artificial mixed minerals demonstrate that raw starch and CMS both have a good inhibitory effect on hematite, that the inhibitory effect of 0.0497 substitution degree of CMS on hematite is best; the concentrate with iron grade of 66.35% and iron recovery of 95.86% is obtained at the slurry pH of 11.80 with 40mg/L CaCl2, 2mg/L 0.0497CMS and 150mg/L sodium oleate. In addition FT-IR spectra studies,zeta potential measurements and XPS analysis reveal that 0.0497CMS could absorb on hematite surface so that hematite can be inhibited.