您目前所在的位置:首页 - 期刊简介 - 详细页面

铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 6    December 2003

[PDF Download]    [Flash Online]

    

Cleavage nature, electrokinetics, aggregation and dispersion of kaolinite
HU Yue-hua(胡岳华), SUN Wei(孙 伟), 
LIU Xiao-wen(刘晓文), WANG Dian-zuo(王淀佐)

School of Minerals Processing and Bioengineering, 
Central South University, Changsha 410083, China

Abstract:Quantum chemical simulation calculation shows that kaolinite is cleaved to produce (001) and (001-) basal planes. (001) plane is dominant by [SiO4] tetrahedral, which interacted easily with hydrogen ion or other positive ions by electrostatic forces or hydrogen bonding. (001-) plane is dominant by [AlO2(OH)4], which interacted easily with high negativity group such as -O-, -N-, F- etc. The apparent zeta potential and surface points of zero charge(PZC) are different for hard and soft kaolinites depending on their crystallinity index (HI). The self-aggregation between edge and basal plane due to the electrostatic interactions may occur at acidic media. The dispersion of kaolinite particles at alkaline media may be attributed to the electrostatic repulsion between basal planes and/or edges. The aggregation or dispersion behavior is revealed by scan electron microscope and the transmittance measurements for the suspension of kaolinite particles.

 

Key words: kaolinite; cleavage planes; electrokinetics; self-aggregation; dispersion

ISSN 1672-7029
CN 43-1423/U

主管:中华人民共和国教育部 主办:中南大学 中国铁道学会 承办:中南大学
湘ICP备09001153号 版权所有:《铁道科学与工程学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市韶山南路22号 邮编:410075
电 话:0731-82655133,82656174   传真:0731-82655133   电子邮箱:jrse@mail.csu.edu.cn