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某镍铁厂建设项目是一个大型冶炼红土矿生产镍铁项目,采用国际广泛应用的RKEF工艺流程,即回转窑焙烧-电炉熔炼流程,项目设计处理红土矿约123万吨/年,年产镍铁含镍品位25%以上的镍铁约8.5万吨,采用两条同等规模的回转窑焙烧-电炉熔炼镍铁生产线,项目关键环节之一的焙烧还原环节选用Φ5.5×115m大型焙烧回转窑为目前国内最大的红土矿冶炼回转窑。本文介绍了该窑的焙烧还原工艺及构成,重点阐述回转窑的筑炉方法。
A nickel-iron plant construction project is a large-scale smelting laterite mine production of ferronickel project, the use of internationally widely used RKEF process, that is rotary kiln roasting - electric smelting process, the project designed to process about 1,200,000 tons of laterite ore, with an annual output of nickel Ferron nickel content of more than 25% nickel grade about 85,000 tons, using two of the same scale rotary kiln roasting - electric smelting ferronickel production line, the key part of the project roasting and reduction part selection Φ5.5 × 115m large roasting rotary kiln At present, the country’s largest laterite ore smelting rotary kiln. This paper introduces the roasting and reduction process and composition of the kiln, and focuses on the method of building kiln furnace.