Granulation Technology of Raw Material for Sinter Ore in Tobata No.3 Sinter Plant
One of our key tasks in Tobata No. 3 Sinter Plant in Yawata Works, Nippon Steel Corp., is to reduce the consumption of expensive burnt lime, which is abundantly used to ensure the permeability of sinter beds. Conversely, as shown by many previous studies concerning the binder of raw material for sinter ore, no alternative to burnt lime has yet been developed and implemented. In this report, the development of a new binder that allows us to realize the intensified granulation of a raw material, its performance under lab-examination and the test operation of an actual plant are presented. Lab-examination results showed that the granular index can be improved when dispersant is added compounded together with micro-particles, and the highest effect on productivity improvement was identified in the pot test. An actual plant test was also implemented, targeting a reduction in burnt lime, through the improved permeability of sinter beds and with the intensified granulation of raw materials employing this new binder (micro-particles addition plus dispersant). It was confirmed that a reduction of approximate 10 kg/t-sinter in burnt lime consumption unit could be achieved as productivity and sinter ore strength were maintained at an approximately constant level and operation stably secured. Meanwhile, the granulation index of the compounding raw materials and the permeability before ignition were retained at levels equivalent to those in the case of the base. Furthermore, synthetic binder consumption unit, including burnt lime and micro-particles additives, was reduced approximately 6 kg/t-sinter despite of adding micro-particle additives amounting to 4.3 kg/t-sinter.
granulation binder micro-particles
Osamu Ishiyama Kenichi Higuchi Kazuyuki Shinagwa Kohichi Ooyama
Environmental and Process Technology Center, Nippon Steel Corporation Yawata Works, Nippon Steel Corporation
国内会议
北京
英文
1-8
2011-10-26（万方平台首次上网日期，不代表论文的发表时间）