变性淀粉在赤铁矿阳离子反浮选脱硅中的抑制性能

发布时间：2018-02-27 14:10

本文关键词： 羧甲基淀粉磷酸酯淀粉取代度赤铁矿阳离子反浮选　出处：《工程科学学报》2017年12期 　论文类型：期刊论文

【摘要】：以十二胺为捕收剂,木薯原淀粉、取代度为0.026和0.21的羧甲基淀粉和取代度为0.0065和0.055的磷酸酯淀粉作为抑制剂,考察了赤铁矿与石英的可浮性,重点研究了基团取代度对变性淀粉抑制性能的影响.结果表明:原淀粉、取代度0.026的羧甲基淀粉和取代度0.0065的磷酸酯淀粉对赤铁矿有良好的抑制作用,而取代度0.21的羧甲基淀粉和取代度0.055的磷酸酯淀粉对赤铁矿的抑制能力较弱;原淀粉和取代度0.026的羧甲基淀粉对石英有较强抑制作用,其他3种淀粉对石英抑制能力较弱.可见,低取代度的磷酸酯淀粉,在赤铁矿阳离子反浮选脱硅中可作为较高选择性的抑制剂.Zeta电位测定结果表明,特征基团取代度相对较高的变性淀粉,与赤铁矿和石英作用后,矿物Zeta电位负值较大.变性淀粉的取代度越高,其伸展向溶液中荷负电的基团越多,使阳离子捕收剂通过静电作用吸附于矿物表面,减弱了变性淀粉的抑制能力.
[Abstract]:The floatability of hematite and quartz was investigated with 12 amine as collector, cassava starch as raw starch, carboxymethyl starch with degree of substitution of 0.026 and 0.21 and phosphate starch with degree of substitution of 0.0065 and 0.055 as inhibitors. The effect of degree of substitution of groups on the inhibition of modified starch was studied. The results showed that the original starch, carboxymethyl starch with 0.026 degree of substitution and phosphate starch with 0.0065 degree of substitution had a good inhibitory effect on hematite. Carboxymethyl starch with 0.21 degree of substitution and phosphate starch with degree of substitution of 0.055 have weak inhibition on hematite, while original starch and carboxymethyl starch with degree of substitution 0.026 have strong inhibitory effect on quartz. It can be seen that the phosphate starch with low degree of substitution can be used as a high selectivity desilication desilication in hematite cation reverse flotation. When the modified starch with relatively high degree of substitution of the characteristic group acts with hematite and quartz, the negative value of mineral Zeta potential is larger. The higher the degree of substitution of modified starch is, the more groups of groups extend to negative charge in solution. The cation collector is adsorbed on the mineral surface by electrostatic action, which weakens the inhibition ability of modified starch.
【作者单位】：北京科技大学土木与资源工程学院;北京矿冶研究总院矿物加工科学与技术国家重点实验室;
【基金】：国家自然科学基金资助项目(51304022) 国家国际科技合作专项资助项目(2015DFA60330)
【分类号】：TD951

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