Technology status and development direction of pre-iron ore proportioning technology
Iron and steel production is dominated by the long process of"blast furnace-converter"in China,in which the pre-iron process is the core link of conversion between ferrite material flow and carbon energy flow,and its production cost accounts for more than 75％of the whole process,energy consumption accounts for about 90％,and carbon emissions account for 95％of the total emissions per ton of steel,which is a key process affecting the high-quality development of the steel industry.It is worth noting that the quality of raw materials has an important impact on the stability of the entire ironmaking process,carbon emissions,energy consumption and production costs,when the FeO mass fraction of sinter decreases by 1％,the coke ratio will decrease by 1.0％～1.5％,and the output will increase by 1.0％～1.5％;when the pulverization rate of low-temperature reduction increases by 10％,the coke ratio will increase by 1.5％and the yield will decrease by 3％;when the fluctuation of TFe mass fraction decreases from±1％to±0.5％,the coke ratio will decrease by 1％and the yield will increase by 2％.Therefore,all leading domestic iron and steel enterprises attach their great importance to the pre-iron ore proportioning and mixing,have established a ore proportioning model based on linear programming algorithm,genetic algorithm,fuzzy neural network,adaptive evolution algorithm,etc.,and adopt different forms of mixing methods such as mine mixing,port coarse mixing,fine mixing between tiling and direct extraction,and"ore proportioning tank+strong mixing"fine mixing,so as to improve resource utilization efficiency in the case of a wide variety of iron ore types and tight total amount.In addition,in view of the contradiction between the green and low-carbon development of the global steel industry and the decreasing high-quality iron ore resources,it is necessary to further strengthen the technological innovation of ore proportioning,optimize the allocation of iron ore resources,and help the steel industry achieve low-carbon and high-quality development.
iron oreore proportioning technologyproduction costsenergy consumptioncarbon emissions
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