苯氧乙酸类化合物的制备及其浮选抑制性能

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

Preparation of phenoxy carboxylic acid and its depression on calcite

A new type of flotation reagents, phenoxy poly(acetic acid), was prepared by treating phenol or polyphenol, such as dihydroxybenzene and v-t rihydroxybenzene, with chloroacetic acid in an alkali solution. Controlling the reaction pH value and developing a new self-sealing method brought about a good syn thesizing result with high yield and selectivity. It has been shown that the syn thesized chemicals, especially the product of pyrogallol and gallic acid reactin g with chloride acetic acid, act as effective depressants in the flotation of ca lcite. When sodium oleate with 1×10-4 mol/L is used as a collector, calci te can be completely depressed when the concentration of two chemicals is 4×10 -5 mol/L and 5×10-5 mol/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 relations hip of the synthesized chemicals.