摘要
通过单矿物浮选实验、浮选溶液化学计算、Zeta电位测试和红外光谱分析研究了油酸钠对高岭石浮选行为的影响以及溶液化学作用机理,旨在为阴离子捕收剂高效浮选高岭石以及铝土矿正浮选提供理论指导。通过高岭石溶解组分的浓度对数图(lg c-pH)理论推算出高岭石零电点PZC=4.52,较Zeta电位所测值(PZC=3.9)偏高,与文献利用AFM所测的高岭石PZC=4～5一致。通过油酸钠溶液各组分的浓度对数图(lg c-pH)可知,形成最大浓度离子-分子缔合物的pH值为8.44,其与最佳浮选pH一致,此时高岭石表面Zeta电位负移也最显著,说明离子-分子缔合物的浮选活性最大。加入阴离子捕收剂油酸钠后高岭石表面Zeta电位整体向负移,说明油酸钠通过非静电力吸附在高岭石表面。结合红外光谱测试结果推断油酸钠与高岭石可能发生化学吸附。
The flotation behaviors and solution chemistry mechanism of sodium oleate on kaolinite have been studied by flotation tests,solution chemistry calculations,Zeta potential measurements and infrared spectroscopic analysis to provide theoretical guidance for efficient flotation of kaolinite and direct flotation of bauxite.The point of zero charge（PZC） of kaolinite is pH=4.52 according to concentration logarithm of kaolinite dissolved components（lg c-pH）,which is greater than（PZC=3.9） measured by Zeta potential and is consistent with PZC=4~5 reported by literature measured by AFM.The maximum concentration of ion and molecular association is achieved at pH=8.44,which is consistent with flotation result.When pH is 8.44,Zeta potential of kaolinite shifts to the most negative value,indicating that ion-molecule association complex is maximum activity flotation.The Zeta potentials of kaolinite shift towards the negative direction,indicating kaolinite adsorbed sodium oleate mainly by non-electrostatic forces.Finally,it comes to conclusion that adsorption of sodium oleate on kaolinite surface may be mainly chemical interaction by combining infrared spectroscopy tests.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2012年第12期119-123,共5页
Journal of Wuhan University of Technology
基金
国家自然科学基金重点项目(41130746)
关键词
高岭石
油酸钠
浮选
溶液化学
ZETA电位
红外光谱分析
kaolinite
sodium oleate
flotation
solution chemistry
Zeta potential
infrared spectroscopic analysis
