Effect of Size Distribution of Coke Powder on Sintering Process and Sinter Quality

Currently, the sinter fuel of Zhongtian Iron and Steel is mainly coke powder. In order to better use coke powder in sintering production, the combustion performance of coke powder with different particle sizes was analyzed with a synchronous thermal analyzer (STA). The effect of particle size distribution of coke powder on sintering process and sinter quality was studied by sintering cup test. The results show that the sintering speed decreases with the increase of coke particle size.The coke powder with particle size less than 0.5 mm is controlled around 20%(mass fraction, the same below), of 20%-25% of ≥ 0.5-<1 mm, 35%-50% of ≥ 1-<3 mm, and within 20% of ≥ 3 mm, or the average particle size of coke powder is controlled to be 1.9-2.2 mm, and the sintering indexs such as sintering fuel consumption, drum strength and yield are in the optimal range.