Study on Proportioning of High Ratio Iron Concentrate at 450m~2 Sinter Plant

On the basis of the analysis of the several ordinary imported iron ores,the optimizing ore blend using the ultrafine concentrates and several imported ore were carried out.The ultrafine concentrates were produced at Taiyuan steel mill,whose size is 85% below 45 μm.It is found out the reasonable proportion of self-produced concentrate A is about 38%-45% with the iron ores from Australia and Brazil.In order to cope with the negative influence of financial crisis and make full use of owned-resource and cheap imported ores,the steel works enhance the proportion of concentrate A to 51% and add 9% of E ore from Australia instead of the expensive D ore from Brazil in the latter half of 2008.A series of effective measures,such as optimizing the technologic parameters of mixture pelletizing,content of moisture,machine speed and the open degree of blower valve,are adopted.The yield and quality of sinter ore completely meet with the demand of large blast furnace furthermore it lay the foundation of adding up the proportion of iron and saving coke ratio and optimizing index of the 4 350 m3 blast furnace.