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Analyses of melting properties and structure of CaO-SiO2-B2O3-boron mudslag system |
School of Materials Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract To investigate the effects of boron mud content on the melting properties and structure of CaO-SiO2-B2O3-boron mudslag system, the melting temperature and the viscosity of slag system were determined by hemisphere and rotating cylinder method, respectively. The phase composition and the silicate micro-structure units were investigated by XRD and Raman spectrum. The results show that the melting temperature and the viscosity of slag system are decreased with the increasing of boron mud content. At 1 200 ℃, the viscosity of slag system is reduced from about 3.0 Pa?s to 0.5 Pa?s with the increasing of boron mud content from 5% to 15%. The main phases of the slag system are 2CaO?SiO2, calcium magnesium silicates of Ca14Mg2(SiO4)8, Ca5MgSi3O12 and Ca3Mg(SiO4)2 and CaO?B2O3. Raman spectrum analysis indicates that the complex silicate network begins to depolymerize with the increasing of boron mud content. The number of non-bridge oxygen increases with decreased number of bridge oxygen, which inevitably causes the decreasing of slag viscosity. The conclusions are consistent with the previous experimental results.
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Received: 02 December 2015
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