摘要
开发合成了一种新型廉价螯合捕收剂COBA ,研究了它对一水硬铝石和高岭石的捕收活性、结构性能关系及作用机理。结果表明 :COBA对一水硬铝石的捕收能力强 ,而对高岭石的捕收能力弱 ,具有比水杨羟肟酸更好的选择性。其性能差异主要是由极性基结构差异即电负性、拓扑连接指数、断面尺寸和疏水性所引起的。COBA对一水硬铝石的捕收机理为 :其分子中的
Carboxyl hydroxidoxime (COBA), a new cheap chelating collector, was synthesized and characterized. Its collecting effect on oxide minerals such as diaspore and kaolinite, structure-activity relationship were studied, and collecting mechanism was also investigated. Carboxyl anhydride, hydroxylamine and sodium hydroxide were mixed in mixture solvent of methanol and water, stirred at 40～45?℃ for 6～8?h, and separated by distillation, acidification and recrystallation to obtain COBA in 86.2% yield with purity of 97.8%. The flotation tests show that the collecting ability of COBA is strong for diaspore than for kaolinite, and it possesses higher selectivity of collecting on comparison with o hydroxyl benzohydroxidoxime (HOBA) as a collector. The reason of which is that COBA has higher group electronegativity, larger topological connectivity index, larger polar group diameter and stronger hydrophobility comparing to HOBA. Furthermore, some evidence indicates that double ring chelating compound is formed by chemical adsorption between the three oxygen atoms in COBA and the aluminium atom on the surface of diaspore. Thus, COBA may become a new type of selective collector for obverse flotation to remove Al Si minerals from bauxite.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2001年第4期702-706,共5页
The Chinese Journal of Nonferrous Metals
基金
国家重点基础研究发展规划项目 (G19990 64 90 1-1)
国家自然科学基金资助项目 ( 5 990 40 0 6)
关键词
COBA
捕收剂
一水硬铝石
高岭石
结构-性能关系
浮选
carboxy benzohydroxidoxime
collector
diaspore
kaolinite
structure and activity relationship
