(中南大学 矿物工程系， 长沙 410083)
摘 要: 以十二胺和丙烯腈为原料，常压下合成了阳离子捕收剂N -十二烷基-1，3-丙二胺(DN12)，考察了其对高岭石、叶蜡石、伊利石的浮选行为。结果表明：DN12的捕收性能优于十二胺；DN12的浓度为3×10-4mol.L-1时，对3种铝硅酸盐矿物的浮选回收率均超过80%，对3种铝硅酸盐矿物的捕收能力顺序为高岭石＞叶蜡石＞伊利石；浮选pH范围为5～8。动电位和红外光谱说明DN12与铝硅酸盐类矿物形成了氢键并产生静电吸附，且作用较强。
关键字: N -十二烷基-1， 3-丙二胺；铝硅酸盐矿物； 反浮选； 动电位； 红外光谱
with N-dodecyl-1，3-diaminopropane
（Department of Mineral Engineering， Central South University，
Changsha 410083， P.R.China）
Abstract: The flotation behaviors of kaolinite， pyrophyllite and illite have been investigated using N-dodecyl-1， 3-diaminopropane (DN12) as a collector. The results indicate that the DN12 is a better cationic collector than the dodecyl amine. When c(DN12)=3×-4mol.L-1，the recoveries of flotation of the three aluminium silicate minerals are all over 80%.In wide pH region， DN12 exhibits strong collection ability on the three aluminium silicate minerals. FTIR-DRIR results provide some evidences of existence of hydrogen bonding between polar group of DN12 and the surface of silicate minerals. DN12 may become a new type of selective collector for reverse flotation to remove aluminium silicate minerals from bauxite.
Key words: N-dodecyl-1，3-diaminopropane; aluminium silicate minerals; reverse floatation; zeta potential; FTIR
