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《地球科学》 2002-05
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Preparation of Mineral Polymer from Potassium Feldspar Wastes: An Experimental Study

MA Hong wen, LING Fa ke, YANG Jing, WANG Gang (National Laboratory of Mineral Materials, China University of Geosciences, Beijing100083, China)  
Potassium feldspar wastes from Shaxian County, Fujian Province were used as raw materials to prepare mineral polymer in this study. The waste particles ranging from 0.4 to 1 000 μm in size, averaging to 45 μm, were mixed with calcined kaolin. With liquid sodium silicate as structural template, and sodium hydroxide solution as activator, the mineral polymers were prepared. The optimal technical parameters were determined by the orthogonal experiments, as shown below (by weight): the proportion of kaolin in the solid materials was 1/4, the ratio of NaOH solution (10 mol/L) to sodium silicate ( m =3.3) in the liquid was 3/7, the ratio of the solid to liquid was 4, at 60 ℃ and for 72 h. Compressive strengths of the mineral polymer samples were tested up to 19.4-24.9 MPa after 7-28 d's solidification, the acid and alkaline resistances well satisfied the China National Specifications for analogues of structural construction materials. As shown in the experiments, the kaolin proportion in the solid materials was kept around 20%, but the compressive strengths of the mineral polymers were enhanced with increasing both the proportion of sodium silicate in the liquid and the ratio of solid to liquid, resulting in the paradoxical change of the compressive strengths with the prolonging of the solidifying time. The formation process of mineral polymers can be divided into four stages, i.e., dissolution of aluminium and silicon from particles of kaolin and the waste solid materials and its complex in the liquid, diffusion from the particle surface into interstitial space, concentrating and polymerization of the components by geochemical reactions to form interstitial aluminosilicate gel, and dehydration of extra water and solidification of the gel phase. The matrix phase so formed in mineral polymer, similar to zeolite in chemical composition, is possibly an analogue of opal in microtexture, and shows a three dimension network in physical framework acting as a structural foundation of the mineral polymers with excellent mechanical properties.
【Fund】: 教育部博士学科点基金项目 (No .19990 4 9114 )
【CateGory Index】: TD926.4
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