| Cleavage nature,electrokinetics,aggregation and dispersion of kaolinite |
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| 作者姓名： | 胡岳华 孙伟 刘晓文 王淀佐 |
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| 作者单位： | School of Minerals Processing and Bioengineering，School of Minerals Processing and Bioengineering，School of Minerals Processing and Bioengineering，School of Minerals Processing and Bioengineering Central South University，Changsha 410083，China，Central South University，Changsha 410083，China，Central South University，Changsha 410083，China，Central South University，Changsha 410083，China |
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| 基金项目： | Project(G19990 64 90 1)supportedbytheNationalKeyFundamentalResearchandDevelopmentProgramofChina,project(59925412)supportedbytheChinaNationalScienceFundforDistinguishedYoungScholar |
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| 摘 要： | 1 INTRODUCTIONKaoliniteiscurrentlyusedinceramics ,papermanufacturing ,medicalapplications ,agriculturalchemicals ,chemicalengineering ,refractorymaterialanddefenseindustrybecausekaolinitehasmanyhighprocessingpropertiesasanindustrialmineralduetoitssurfaceproperties1,2 ] .Inreverseflotationofdi asporicbauxite ,whichisveryimportantforthein dustryofaluminumoxideproduction ,kaoliniteisneededtoberemoved .Therefore ,Itisusefultoun derstandthecrystalstructure ,cleavagenature ,sur faceelectrokin…
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Cleavage nature, electrokinetics, aggregation and dispersion of kaolinite |
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| HU Yue-hua,SUN Wei,LIU Xiao-wen,WANG Dian-zuo.Cleavage nature,electrokinetics,aggregation and dispersion of kaolinite[J].Transactions of Nonferrous Metals Society of China,2003,13(6). |
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| Authors: | HU Yue-hua SUN Wei LIU Xiao-wen WANG Dian-zuo |
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| Abstract: | Quantum chemical simulation calculation shows that kaolinite is cleaved to produce (001) and (001) basal planes. (001) plane is dominant by (SiO_4]) tetrahedral, which interacted easily with hydrogen ion or other positive ions by electrostatic forces or hydrogen bonding. (001) plane is dominant by (AlO_2(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. |
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| Keywords: | kaolinite cleavage planes electrokinetics self-aggregation dispersion |
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