碳热法还原攀钢高钛高炉渣工艺研究

Research on Reduction of Panzhihua Iron and Steel Co BF Slag by Carbon Thermal Reaction

为了达到使攀钢高炉渣中钛氧化物富集的目的,从而综合有效利用攀钢高炉渣,将含钛高炉渣配加焦粉或者石墨在不同温度下进行烧成。研究了反应温度、还原剂类型及助熔剂铁粉对反应产物富集情况的影响,同时借助于XRD、SEM等手段对反应后试样的物相组成和显微结构进行了观察和分析。结果表明:该工艺可以使渣中的钛元素以TiN的形式富集;相对于石墨来说,用焦粉做还原剂更有利于渣中钛元素的富集和TiN晶粒的生长;助熔剂铁粉的加入使得反应生成的TiN晶粒更加容易富集,且生成的TiN晶粒以包围状分布在圆形Fe的周围,温度的升高使得该现象更加明显。

Panzhihua iron and steel Co blast furnace （BF） slag added with coke powder or graphite was sintered at different temperatures in order to promote the enrichment of titania contained in the BF slag and thereby realize the comprehensive utilization of BF slag bearing titanium. The effects of sintering temperature, reducing agents and metallic iron powder on the enrichment of titania were investigated. At the same time, the phase compositions, mierostrueture of the samples were determined and observed by means of X-ray diffraction, scanning electron microscope （SEM）. The results show that the dispersed titanium compounds contained in BF slag could be enriched selectively in TiN phase during the process. Compared with graphite, coke powder is more beneficial to the enrichment of titania and the growth of TiN crystal grain ; Metallic iron can promote the enrichment of TiN grain generated during the reaction. In addition, the metallic iron was surrounded by TiN grains generated from the BF slag. With the increasing of the temperature, the phenomenon mentioned above seems more apparent.