工程科学学报2017，Vol.39Issue(12)：1815-1821,7.DOI:10.13374/j.issn2095-9389.2017.12.006
变性淀粉在赤铁矿阳离子反浮选脱硅中的抑制性能
Depressing capability of modified starches in the reverse flotation of quartz from hematite with cationic collectors
摘要
Abstract
The floatability of hematite and quartz were investigated using dodecylamine as collector and cassava starch, carboxym-ethyl starches with degree of substitution (DS) of 0. 026 and 0. 21, and phosphate ester starches with DS of 0. 0065 and 0. 055 as de-pressants. The effect of DS on the depressing behavior of modified starches was studied. The flotation results show that native starch, carboxymethyl starch with DS of 0. 026, and phosphate ester starch with DS of 0. 0065 can strongly depress hematite, whereas carboxy-methyl starch with DS of 0. 21 and phosphate ester starch with DS of 0. 055 weakly depress it. The native starch and carboxymethyl starch with DS of 0. 026 can strongly depress quartz, whereas the other three starches are investigated possessed less depressing capa-bilities for quartz. The results reveal that a low-DS phosphate ester starch is a highly selective depressant in the reverse flotation of sili-ca-containing iron ore with cationic collectors. The Zeta potential measurements exhibit that modified starches with higher DS can lead to lower Zeta potentials of minerals. Thus, the weakened depressing capabilities of modified starches might adsorb cationic collectors on the mineral surface via electrostatic attraction with negatively charged groups stretching into the solution.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Key words
carboxymethyl starch/phosphate ester starch/degree of substitution ( DS)/hematite/reverse flotation with cationic collectors分类
矿业与冶金引用本文复制引用
任爱军,孙传尧,朱阳戈..变性淀粉在赤铁矿阳离子反浮选脱硅中的抑制性能[J].工程科学学报,2017,39(12):1815-1821,7.基金项目
国家自然科学基金资助项目(51304022) （51304022）
国家国际科技合作专项资助项目(2015DFA60330) （2015DFA60330）
