苯氧乙酸类化合物的制备及其浮选抑制性能

来源期刊：中南大学学报(自然科学版)2001年第2期

论文作者：张剑锋 胡岳华 王淀佐

文章页码：146 - 149

关键词：苯氧乙酸;抑制性能;浮选

Key words：phenoxy poly(acetic acid); depressants; flotation

摘    要：以苯酚、水杨酸、邻苯二酚、间苯二酚、对苯二酚、连苯三酚和没食子酸为原料,在碱性条件下分别与一氯乙酸反应制得了一类新型浮选药剂———苯氧乙酸类化合物,通过控制反应体系的pH值和使用本生阀密封装置,减少了酚羟基的氧化和一氯乙酸的水解反应,使反应有较高的产率和较好的选择性.浮选试验结果表明:合成的化合物对方解石均有一定的抑制能力,特别是以连苯三酚和没食子酸为原料制得的化合物对方解石有很强的抑制能力,在捕收剂油酸钠的浓度为1×10^-4mol/L,抑制剂浓度分别为5×10^-5mol/L和4×10^-5mol/L时,方解石可基本上被抑制.从基团电负性、浮选剂特性指数和亲憎平衡值等方面,对苯氧乙酸类化合物的抑制机理及其结构与性能关系进行了探讨.

Abstract: A newtype of flotation reagents, phenoxy poly(acetic acid), was prepared by treating phenol or polyphenol,such as dihydroxybenzene and v-trihydroxybenzene, with chloroacetic acid in an alkali solution. Controlling the reactionpHvalue and developing a new selfsealingmethod brought about a good synthesizing resultwith high yield and selectivity. It has been shown that the synthesized chemicals, especially the product of pyrogallol and gallic acid reacting with chloride acetic acid, act as effective depressants in the flotation of calcite. When sodium oleate with 1×10^-4mol/L is used as a collector, calcite can be completely depressed when the concentration of two chemicals is 4×10^-5mol/L and 5×10^-5mol/L at pH value 8.78 and 8.47, respectively. The electronegativity of group, reagent specific exponent and HLB are discussed, which have explained the depressing mechanism and structure-property relationship of the synthesized chemicals.