Exploration of the Correction Between Na2CO3 Fluxing Agent and Crystal Phase Transformation and Mechanical Properties of Asbestos Tailings Microcrystalline Ceramics
ZHOU Guo1,2, SUN Hongjuan1,2, PENG Tongjiang1,2,3
1 Key Laboratory of Ministry of Education for Solid Waste Treatment and Resource Recycle, Southwest University of Science and Technology, Mianyang 621010, China 2 Institute of Mineral Materials and Applications, Southwest University of Science and Technology, Mianyang 621010, China 3 Center of Forecating and Analysis, Southwest University of Science and Technology, Mianyang 621010, China
Abstract: Microcrystalline ceramic with forsterite as the main crystal phase was produced through one-time method using asbestos tailings as the main raw material and Na2CO3 as the fluxing agent. The influence of sintering temperature and contents of Na2CO3 on the crystalline phases, mechanical properites and microstructure were invested using X-ray diffraction and scanning electron microsopy to determine these preparing microcrystalline ceramics. The results obtained show that Na2CO3 content is 0%,the increase of sintering temperature would only lead to the disappearance of hematite. Hematite and enstatite had disappeared when Na2CO3 content is 4%, hematite and enstatite converted into magnesioferrite and forsterite gradually during the sintering process. The microcrystalline ceramic achieved optimum mechanical proerites at the sintering temperature of 1 150 ℃ and 4% Na2CO3 content with the bulk density being 2.85 g/cm3, the liner shrinkage being 11.4% and the flexural strength being 65.4 MPa. Na2CO3 plays an important role in the crystal phase transformation and mechanical properties improvement of microcrystalline ceramics prepared by asbestos tailings.
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