用金尾矿合成Ca－α－SiAlON／SiC粉体  

Synthesis of Ca-α-SiAlON/SiC Powder with Gold Tailings

作　　者：仉小猛[1] 徐利华[1] 郝洪顺[1] 刘明[1] 何芳[2] 郭玉娟[1] 

机构地区：[1]北京科技大学 [2]中国石油天然气集团公司

出　　处：《金属矿山》2008年第10期145-148,共4页Metal Mine

基　　金：国家科技支撑计划重大项目(编号:2006BAB02A09);重点项目(编号:2006BAB12B03)

摘　　要：以河南灵宝金矿尾矿为主要原料,配入适量硅砂和分析纯CaO调整组分,利用碳热还原氮化法合成Ca-α-SiAlON/SiC粉。结果表明:Ca-α-SiAlON的形成与体系温度及CaO掺量有关。随反应温度升高,反应产物依次为SiC、α-Si3N4、β-Si3N4和Ca-α-SiAlON,α-Si3N4、β-Si3N4和SiC是合成Ca-α-SiAlON的中间产物。在烧结温度为1 600℃,保温时间为5 h,CaO按化学计量(4.2%)配入的条件下,可获得良好的Ca-α-SiAlON和SiC复合产物,其中Ca-α-SiAlON相对比例约占72%,形貌为柱状晶。Ca-α-SiAlON/SiC powder was produced by carbothermal reduction-nitridation method and using the gold railings from Henan Lingbao Gold Mine as the main raw material, and a proper amount of silica and calcium oxide of analytical grade as regulator. The results show that the formation of Ca-α-SiAlON is dependent on the system temperature and the amount of CaO. With the rise of reaction temperature, the reaction products are formed in sequence of SiC, α-Si3 N4 , β - Si3 N4 and Ca-α-SiAION. α-Si3N4 , β-Si3 N4 and SiC are intermittent products in synthesizing Ca-α-SiAION. At a sintering temperature of 1 600 ℃ , a temperature retaining time of 5 h and a stoiehiometrieal proportion of 4.2% CaO, good Ca-α- SiAION and SiC compound product can be obtained, with the elongated grain Ca-α-SiAION amounting to about 72%.

关 键 词：金矿尾矿 Ca-α-SiAION/SiC 碳热还原氮化法 烧结温度 CaO掺量 

分 类 号：TQ174.758[化学工程—陶瓷工业] TB383[化学工程—硅酸盐工业]