摘要:
对钛精矿碳热还原制备焊条药皮进行研究,在氧化焙烧温度850~900℃、复合添加剂配量3%~5%、还原焙烧温度1 100~1 500℃、焙烧时间240~270 min条件下获得焊条药皮原料——还原钛铁矿,其TiO2大于52%、FeO小于5%,C、S、P等有害元素含量小于0.03%。采用XRD、SEM、EDS及TGA等表征方法对钛铁矿还原前后的物相、形貌、成分等变化进行分析,结果表明:氧化焙烧及复合添加剂的配入改变了钛铁矿的晶体结构,使矿相结构疏松,降低了还原温度,提高了还原反应速度;获得的还原钛铁矿形貌较好,且基本不含有害元素。
Abstract:
The preparation process of welding rod coating by ilmenite carbothermal reduction was investigated.When the conditions are oxidized temperature 850~900℃,content of composite additive 3%~5%,reduce temperature 1 100~1 150℃ and roast time 240~270 min,it can be obtained for the reduced ilmenite of which TiO 2 more than 52%,FeO less than 5%,and the harmful elements of C,S,P all less than 0.03%.Phase,morphology and compositions of ilmenite were analyzed by XRD、SEM、EDS and TGA,and the results indicated that oxidized roast and present of composite additive can change the crystal construction of ilmenite,making the mineral porous and increasing the reduction reaction rate and reduce reduction temperature.The SEM and EDS results showed that a good appearance of reduced ilmenite is obtained,which almost contains no harmful elements such as C,S and P.
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