Adsorption of lignite humic acid onto magnetite particle surface  

作　　者：张元波 李鹏 周友连 韩桂洪 李光辉 许斌 姜涛 

机构地区：[1]School of Mineral Processing and Bioengineering,Central South University

出　　处：《Journal of Central South University》2012年第7期1967-1972,共6页中南大学学报（英文版）

基　　金：Project(50804059) supported by the National Natural Science Foundation of China;Project(50725416) supported by the National Natural Science Funds for Distinguished Young Scholars of China

摘　　要：Modified humic acid (MHA) binder based on lignite humic substances is a novel sort of promising organic binder for iron ore pellets.Humic acid (HA) is one of the main ingredients of MHA binder.Pure HA was firstly isolated from lignite and then adsorption of HA onto magnetite particle surface was investigated.The final results indicate that the adsorption of HA onto magnetite surface accords with Langmuir model well,and it is evidently influenced by the initial HA concentration and solution pH value.Adsorption depends on chemical interaction at pH values above the PZC (the pH where the Zeta potentials of minerals are zero) of magnetite,while electrostatic attraction and chemical interaction both contribute to the adsorption at pH values below the PZC.Modified humic acid （MHA） binder based on lignite humic substances is a novel sort of promising organic binder for iron ore pellets. Humic acid （HA） is one of the main ingredients of MHA binder. Pure HA was firstly isolated from lignite and then adsorption of HA onto magnetite particle surface was investigated. The final results indicate that the adsorption of HA onto magnetite surface accords with Langmuir model well, and it is evidently influenced by the initial HA concentration and solution pH value. Adsorption depends on chemical interaction at pH values above the PZC （the pH where the Zeta potentials of minerals are zero） of magnetite, while electrostatic attraction and chemical interaction both contribute to the adsorption at pH values below the PZC.

关 键 词：lignite humic acid MAGNETITE ADSORPTION Zeta potential 

分 类 号：O647.3[理学—物理化学]