(1. 中國(guó)地質(zhì)大學(xué)(武漢) 材料與化學(xué)學(xué)院，武漢 430074； 2. 中國(guó)地質(zhì)大學(xué)(武漢) 教育部納米礦物材料及應(yīng)用工程研究中心，武漢 430074)
摘 要: 設(shè)計(jì)并合成4種N-羥乙基脂肪酸酰胺類捕收劑，分別為N-羥乙基亞油酸酰胺(ELOA)、N-羥乙基油酸酰胺(EOA)、N-羥乙基蓖麻油酸酰胺(EROA)、N-羥乙基硬脂酸酰胺(ESOA)。考察4種捕收劑對(duì)湖南鳳凰-花垣地區(qū)低品位碳酸錳礦的浮選行為。錳品位為11.49%的原礦，通過(guò)一次粗選工藝后，捕收能力順序?yàn)椋篍LOA≈EOA＞EROA＞ESOA。其中，經(jīng)過(guò)化合物ELOA和EOA浮選后的精礦中錳的品位分別為14.86%、14.69%，回收率分別為81.85%、83.54%。通過(guò)表面張力、Zeta 電位、IR及量子化學(xué)計(jì)算探究捕收劑與錳礦之間的作用機(jī)理。結(jié)果表明：4種N-羥乙基脂肪酸酰胺類化合物和錳礦之間是化學(xué)吸附作用；捕收劑能明顯地降低溶液的表面張力，降低礦物表面的動(dòng)電位；分子中的負(fù)電荷主要集中在N，O原子上，分子與礦物表面的Mn具備多個(gè)作用位點(diǎn)及多種作用模式。
關(guān)鍵字: N-羥乙基脂肪酸酰胺；低品位；碳酸錳；浮選
（1. Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China; 2. Engineering Research Center of Nano-Geo Materials, Ministry of Education China University of Geosciences, Wuhan 430074, China）
Abstract:Four N-hydroxyethyl fatty acid amide collectors were designed and synthesized. They were N-hydroxyerhyl linoleic acid amide (ELOA), N-hydroxyerhyl oleic acid amid (EOA), N-hydroxyethyl ricinoleic acid amid (EROA) and N-hydroxyethyl stearic acid amide (ESOA). Using the raw ore with 11.49% manganese in Fenghuang-Huayuan, Hunan Province, through one rougher flotation, the connections of four collectors’ abilities are ELOA≈EOA>EROA>ESOA. The concentrates with 14.86%, 14.69% in manganese grade and 81.85%, 83.54% in recovery rate are obtained after using ELOA and EOA, respectively. The interaction mechanism between collector and mineral was studied by the surface tension test, Zeta potential test, IR and quantum calculation. The results show that chemical adsorption occurred between collectors and the manganese ore. Besides, the collectors can reduce the surface tension and the Zeta potential. Moreover, the negative charge focuses on the nitrogen and oxygen atoms and there are a number of sites and a variety of action patterns between molecules and Mn on the mineral surface.
Key words: N-hydroxyethyl fatty acid amide; low-grade; manganese; flotation
