(1. 中国地质大学(武汉) 材料与化学学院，武汉 430074； 2. 中国地质大学(武汉) 教育部纳米矿物材料及应用工程研究中心，武汉 430074)
摘 要: 设计并合成4种N-羟乙基脂肪酸酰胺类捕收剂，分别为N-羟乙基亚油酸酰胺(ELOA)、N-羟乙基油酸酰胺(EOA)、N-羟乙基蓖麻油酸酰胺(EROA)、N-羟乙基硬脂酸酰胺(ESOA)。考察4种捕收剂对湖南凤凰-花垣地区低品位碳酸锰矿的浮选行为。锰品位为11.49%的原矿，通过一次粗选工艺后，捕收能力顺序为：ELOA≈EOA＞EROA＞ESOA。其中，经过化合物ELOA和EOA浮选后的精矿中锰的品位分别为14.86%、14.69%，回收率分别为81.85%、83.54%。通过表面张力、Zeta 电位、IR及量子化学计算探究捕收剂与锰矿之间的作用机理。结果表明：4种N-羟乙基脂肪酸酰胺类化合物和锰矿之间是化学吸附作用；捕收剂能明显地降低溶液的表面张力，降低矿物表面的动电位；分子中的负电荷主要集中在N，O原子上，分子与矿物表面的Mn具备多个作用位点及多种作用模式。
关键字: N-羟乙基脂肪酸酰胺；低品位；碳酸锰；浮选
（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
