In recent years, due to the factors coke coal shortage of resources, and environmental protection requirements, non-blast furnace ironmaking technology has made rapid development, rather than the direct reduction ironmaking technology again dominated. Among them, the direct reduction technology suitable for the characteristics of vanadium- titanium magnetite resources has the following three
Rotary kiln reduction-melting process: Although the process is basically open, but because of its long process, difficult operation technology, low recovery rate of iron, vanadium and titanium, high production cost, generally not optimistic.
Tunnel kiln reduction-magnetic separation process: tunnel kiln is the most mature in process. In 2002, Zhongnan University of Technology and Zhongnan Mining Research Institute and Panzhihua Iron and Steel Co., Ltd. completed the experiment of reducing the reduction of mixed reducing agent in tunnel kiln. metal ratio, iron, titanium good separation effect; but the presence of the high energy consumption, refractory consumption, low efficiency of production, 100,000 tons only suitable for mass production. This process is unlikely to form a million-ton steel plant.
Direct reduction technology for rotary hearth furnace: It is the third-generation ironmaking technology that is the most advanced in the world and has entered industrialization. The direct reduction of the rotary hearth furnace adopts the internal carbon mixing process, which has a large reduction interface, a high reduction temperature, and a fast reduction speed. More importantly, the rotary hearth furnace has the characteristics that the charge and the bottom of the furnace are relatively stationary, and can be large. To the extent that the degree of expansion and pulverization of vanadium-titanium magnetite pellets is alleviated, the requirements for the reduction of vanadium-titanium magnetite are well satisfied, and a feasible way for comprehensive recycling of vanadium-titanium magnetite resources is finally realized.
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