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| STUDY ON ADSORPTION BEHAVIOR OF METAL IONS ON SOME SILICATE MINERALS |
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Revised:March 25, 2001
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| DOI： |
| KeyWord:Silicate minerals,Crystal structure,Adsorption |
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| Abstract: |
| The adsorption behavior of Fe 3+ ,Cu 2+ ,Pb 2+ ,Ca 2+ on the silicate minerals was studied in this paper It shows that the adsorption capability of the minerals is closely related to their crystal structure The metal cations are mainly adsorbed on the ion exchange sites on the spodumene surface and thus it has the high adsorption capability to almost all of the metal ions The site where copper ions are adsorbed is between two silicon oxygen tetrahedron layers of the lepidolite,where the top oxygen anions(the oxygen anions which are not in the bridge oxygen plane)are opposite each other The transition metal ions with an ion radius similar to copper ion have a close affinity for this inter layer site Owing to their large ion radius,the lead and calcium ions are not suitable for this site,but the lead ion can be attached to the position where the potassium ion exists formerly There are many aluminum oxygen octahedra exposed on the surface of almandine and an adsorbed metal ion can coordinate with two oxygen anions of an aluminum oxygen octahedron However,there are mainly metal oxygen tetrahedra exposed on the surface of quartz,feldspar and beryl and an adsorbed metal ion can coordinate with only one oxygen anion of a tetrahedron This is main cause that the almandine has a higher adsorption capability than quartz,feldspar and beryl |
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