Synthesis of Two Aromatic Xanthates and Their Flotation Properties on Chalcopyrite
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摘要:
以苯甲醇、对甲基苯酚、二硫化碳和氢氧化钾为原料合成两种互为同分异构体的芳香基黄原酸盐——苯甲基黄原酸钾(BzX)和对甲基苯基黄原酸钾(MPX),并对其进行了结构表征。结果表明,二硫化碳与苯甲醇或对甲基苯酚优化的摩尔比为4 GA6FA 1,MPX优化的反应温度为30℃时,BzX优化的反应温度为25℃。采用单矿物浮选试验考查了两种药剂对黄铜矿的浮选性能,结果表明,BzX的浮选性能优于MPX。采用DFT计算和红外光谱分析考察了药剂在黄铜矿表面的吸附机理,证实了两种药剂在黄铜矿表面的吸附以化学吸附为主。
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关键词:
- 芳香基黄原酸盐 /
- 同分异构体 /
- 浮选 /
- 黄铜矿 /
- [WTBZ]DFT计算
Abstract:Potassium benzyl xanthate (BzX) and potassium 4-methylphenyl xanthate(MPX), which are isomers of each other, were synthesized via the reaction of benzyl alcohol or p-methylphenol, carbon disulfide, and potassium hydroxide, and characterized by a variety of techniques. The results showed that the optimal molar ratio of carbon disulfide to benzyl alcohol or p-methylphenol was 4 GA6FA 1 and the optimal synthesis temperature for BzX was 30℃, and the optimal synthesis temperature for BzX was 25℃. The flotation performance and adsorption mechanism of BzX, MPX on the chalcopyrite were investigated. Flotation results and DFT theoretical calculations indicated that BzX exhibited better collecting performance compared with MPX. The adsorption mechanism of agents on the chalcopyrite surface was investigated by DFT calculation and infrared spectrum analysis. The results showed that the adsorption of the two collectors on the malachite surface was mainly chemical adsorption.
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Key words:
- aromatic xanthate /
- isomers /
- flotation /
- chalcopyrite /
- DFT calculation
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表 1 黄铜矿与黄铁矿中主要元素含量
Table 1. Element contents of chalcopyrite and pyrite
Elements Contents (%) Chalcopyrite Pyrite Cu 32.59 0.0917 Fe 27.84 48.70 S 29.23 47.27 Zn 0.103 0.122 Si 1.11 1.34 Al 0.213 0.235 表 2 在DFT/B3LYP6-311G(d)水平下捕收剂的前线轨道能量
Table 2. The frontier orbital eigenvalues of collectors at B3LYP/6-311+G(d) level
Reagent EHOMO ELUMO EHOMO—ELUMO BzX -0.24626 -0.06518 -0.18108 MPX -0.24895 -0.07044 -0.17851 -
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