Abstract The effect of acid surface pretreatment on the flotation behaviors of ilmenite and titanaugite was investigated with BHA collector and Pb2+ activator. The flotation recovery of ilmenite improved from 62.56% to 84.68% at pH 8.0 after pretreated with H2SO4 solution, while that of titanaugite decreased from 35.73% to 0.54%. The results of SEM and ICP analysis showed that the dissolution of Fe, Ca, and Mg elements on titanaugite surfaces was greater than those of ilmenite in the acid solution, especially Fe element. XPS analysis indicated that after the acid surface pretreatment, Ti became a new active site reacted with BHA and the main active sites for ilmenite changed from Fe, Mg, and Ca to Ti and Fe, while the Fe active site disappeared for titanaugite. These changes in the active sites increased the floatability of ilmenite and reduced the floatability of titanaugite.

中文翻译：

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酸性表面预处理对钛铁矿和钛辉石浮选的影响及其作用机制

摘要 用BHA捕收剂和Pb2+活化剂研究了酸性表面预处理对钛铁矿和钛辉石浮选行为的影响。H2SO4溶液预处理后，钛铁矿在pH 8.0时的浮选回收率由62.56%提高到84.68%，而钛辉石的浮选回收率从35.73%下降到0.54%。SEM和ICP分析结果表明，在酸溶液中钛辉石表面的Fe、Ca、Mg元素的溶解量大于钛铁矿，尤其是Fe元素。XPS分析表明，酸表面预处理后，Ti成为新的与BHA反应的活性位点，钛铁矿的主要活性位点由Fe、Mg、Ca变为Ti和Fe，而钛辉石的Fe活性位点消失。