Contribution Oral Presentation
Present and Perspective of Ironmaking in China
During last few years, iron production in China was kept at about 700 million tons annually, which was totally produced from BF process. At same time, a lot of mini BFs have been eliminated, and many big BFs have been built up and put into operation. There are 23 BFs with inner volume equal or over 4000m3. Both sinter machines and pellet facilities have been enlarged and upgraded correspondingly. Iron burden constitute has been shifted to 70% of sinter, 15-20% of pellet, and 10-15% of lump in general. Under the conditions of frequent changes in raw material quality and big economic pressure, BF operation controls have been improved in many aspects to maintain stable operation indexes, and to realize low cost production. Many new techniques and facilities have been developed and applied in ironmaking process, including new sealing technique of sinter machines, straight grate pellet process, Ti-Mg bearing pellet, and BF monitoring devices. There is significant progress in cleaning production. Strict emission standards have been imposed on all steel works. Various desulphurization facilities have been installed to treat sinter flue gas. Many open raw material yards have been modified to complete closing ones for dust emission control. Casting areas of blast furnaces have been sealed efficiently. Iron production in China is expected to be reduced gradually in the future, due to overcapacity control of steel production and more recycling of scrap. There is a big room for Chinese ironmaking improvement, including upgrading efficiency of BF ironmaking process, reducing BF fuel rate, extending BF campaign life, and pollution control further. Developing and application of BF smart control systems, by means of various artificial intelligence techniques, are hot points in our industry in the future. CO2 emission control will be a big challenge for current BF process. New ironmaking processes will be explored continuously.