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SYNTHESIS SILICON CARBIDE POWDERS FROM IRON ORE TAILINGS

ZHANG Shuhui, XUE Xiangxin, JIN Zaifeng (School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China)  
SiC powders were synthesized by carbothermal reduction from iron ore tailings and carbon black. Phase composition of reaction products was determined by X-ray diffraction. The influence of synthesis temperature and holding time on synthesis was investigated. The content of SiC in the products increases with the increase of synthesis temperature and reaches the maximum at 1 480 ℃. The holding time does not affect the reaction significantly, however, as the holding time is expended, the carbonthermal reduction reaction proceeds more sufficiently. The content of SiC in the samples reaches the maximum after being held at 1 480 ℃ for 8 h as the perfect holding time.
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