(長沙礦冶研究院有限責任公司，長沙 410012)
摘 要: 首次確定太鋼袁家村鐵礦中綠泥石的類型和化學式，針對該綠泥石中金屬離子種類和含量及其碎解暴露面特點，設計并合成出新型醚酸捕收劑CY-1。通過綠泥石、赤鐵礦單礦物浮選試驗、微細粒富綠泥石赤磁混合鐵礦實際入浮礦石浮選試驗、FT-IR光譜分析、Zeta電位測試、吸附量試驗、DFT計算和XPS分析研究CY-1對綠泥石礦物的浮選性能及作用機理。單礦物浮選試驗結(jié)果表明，捕收劑CY-1對綠泥石的捕收能力顯著強于NaOL的。堿性條件下反浮選袁家村微細粒赤磁混合鐵礦時與使用NaOL捕收劑相比較：30 ℃時，CY-1所取得的粗精礦中鐵品位和回收率分別提高2.27%和1.22%；20 ℃時，CY-1所取得的粗精礦中鐵品位和回收率分別提高11.11%和11.84%。DFT計算表明，CY-1分子的羧基O是作用于礦物的主要位點，親固基中的其他O也是活性供電子中心。CY-1浮選綠泥石的作用機理研究表明，分子中特有的“冠醚”結(jié)構(gòu)使CY-1與綠泥石表面的Mg和Al產(chǎn)生化學鍵合反應，提高捕收劑對綠泥石的浮選捕收能力。
關(guān)鍵字: CY-1；綠泥石；反浮選；浮選機理
（Changsha Research Institute of Ming and Metallurgy Co., Ltd., Changsha 410012, China）
Abstract:In this work, the type and chemical formula of chlorite in Yuanjiacun iron mine of Taiyuan Iron and Steel Company were determined for the first time. A novel ether acid collector CY-1 was designed and synthesized according to the types and contents of metal ions in the chlorite and the characteristics of its decomposition exposed surface. The flotation behavior and adsorption mechanism of CY-1 to chlorite were investigated by micro-flotation tests of single chlorite and hematite minerals, bench scale flotation tests of fine hematite/magnetite mixed actual iron ore contained high content of chlorite, FT-IR spectra, zeta potential measurements, adsorption capacity, density functional theory (DFT) calculations and XPS. The micro-flotation results of single minerals indicate that CY-1 exhibits superior flotation performance to chlorite. The results of flotation tests of hematite/magnetite mixed actual iron ore show that, the iron concentrate grade and recovery obtained by CY-1 increase by 2.27% and 1.22% at 30 ℃ and by 11.11% and 11.84% at 20 ℃, responsively compared to those by NaOL. DFT calculation results show that carboxyl O of CY-1 is the main sites for interaction with minerals, and the other O in the solidophilic group is also active center for providing electrons. CY-1 shows unique structure, such as the “crown ether” shape structure of solidophilic group, resulting in superior targeting effect on Mg and Al on dissociation surface of chlorite, which improves the collector''''s flotation ability to chlorite.
Key words: CY-1; chlorite; reverse floatation; flotation mechanism
