(1. 中南大學(xué) 化學(xué)化工學(xué)院， 長沙 410083；
2. 中南大學(xué) 礦物工程系， 長沙 410083)
摘 要: 用三丁基乙基硫酸乙酯銨作相轉(zhuǎn)移催化劑，以苯二酚、一氯乙酸和氫氧化鈉為原料，用三氯甲烷作溶劑，合成了3種不同結(jié)構(gòu)的苯二氧基二乙酸。分別以油酸鈉、十二胺和丁黃藥為浮選捕收劑，考察了苯二氧基二乙酸對方解石、一水硬鋁石和黃鐵礦的抑制性能。結(jié)果表明，苯二氧基二乙酸的抑制能力較強(qiáng)，對上述3種礦物的抑制性能大小順序?yàn)椋悍浇馐?gt;一水硬鋁石>黃鐵礦，可作為方解石等含鈣、鎂脈石礦物的有效抑制劑。 從基團(tuán)電負(fù)性、浮選劑特性指數(shù)和親憎平衡值等方面，對苯二氧基二乙酸的抑制性能進(jìn)行了討論。用MINDO 3方法對3種藥劑進(jìn)行了量化計(jì)算，量化計(jì)算結(jié)果表明，它們的抑制能力大小順序?yàn)椋簩ξ?gt;間位>鄰位；它們均以負(fù)一價(jià)離子的形式與礦物中的金屬離子發(fā)生作用，未離解的羧基則難以發(fā)生離解，從而保證藥劑與礦物作用后的親水性，使礦物得到抑制。
關(guān)鍵字: 苯二氧基二乙酸； 相轉(zhuǎn)移催化； 浮選性能；抑制
flotation performance of biphenoxyl bi(acetic acid)
（1. School of Chemistry and Chemical Engineering,
Central South University, Changsha 410083, P.R.China；
2. Department of Mineral Engineering, Central South University,
Changsha 410083, P.R.China）
Abstract: In the presence of tributylethylammonium ethosulfate as a phasetransfer catalyst, three kinds of biphenoxyl bi(acetic acid) are synthesized from biphenol, chloroacetic acid and sodium hydroxide in a chloroform solvent. The depressing performance of biphenoxyl bi(acetic acid) to calcite, diaspore and pyrite was studied. The results show that biphenoxyl bi(acetic acid) possesses good depressing ability to the three minerals in the following order: calcite>diaspore>pyrite. It can be used as an efficient depressant for calcite and diaspore. The electronegativity of group, reagent specific exponent and HLB of biphenoxyl bi(acetic acid) are discussed. Quantum calculation was operated by Mopac Method on MSI workstation, which has explained the depressing mechanism and the structure-performance relations of the synthesized reagents.
Key words: biphenoxyl bi(acetic acid)； phase transfer catalysis； flotation； depression
