Characteristic evolution and corresponding influence of flux particles in sintering process
SHI Xian-ju1,2, WANG Qiang1, LI Guang-qiang1, LIU Dai-fei3, LI Jun2
1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 2. Baosteel Central Research Institute (Rsearch and Development Center of Wuhan Iron and Steel Co., Ltd. ), Wuhan 430080, Hubei, China; 3. School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China
Abstract：In order to study the characteristic evolution of flux particles and corresponding influence on the properties of sinter, the sampling analysis of the whole actual sintering process was carried out. The results indicated that the flux particles less than 0.5 mm were easier to adhere to the surface of core particles than iron ore particles in the mixing process, and these particles distribute uniformly within each grade of the mixture, While the flux particles larger than 0.5 mm, served as the core particles, were adhered with a certain thickness of the adhesive layer that forming new particles, and moreover the thickness of the attachment layer was less than 1 mm, there for, the diameter of the new particles only increases by no more than 2 mm on the basis of the original particles. At the same time, the original flux particles were fine, led to less flux content in the mixture larger than 5 mm after granulation. In the sintering feeding process, there was segregation of particle size, large particles were segregated downward, and the particles larger than 5 mm at the bottom layer were distributed most, resulting in segregation of flux. The increase of particles larger than 5 mm in the mixture increases the flux segregation, while the increase of 3-5 mm particles reduces the flux segregation. Therefore, segregation of particle size reduces the total flux at the bottom layer, increases the larger particle flux. The decrease of the amount of flux particles reduces the distribution point of the flux, and thus increases the uneven distribution of the flux and deteriorates the local high alkalinity environment, then increases the difficulty for liquid phase generation. At the same time, due to the segregation of particles, the large particle iron ore powder in the bottom mixture increases and more unmelted raw ore appears, which eventually leads to the poor quality of the bottom sinter.
史先菊, 王强, 李光强, 刘代飞, 李军. 熔剂颗粒在烧结过程中的特征演变及影响[J]. 钢铁, 2021, 56(12): 28-35.
SHI Xian-ju, WANG Qiang, LI Guang-qiang, LIU Dai-fei, LI Jun. Characteristic evolution and corresponding influence of flux particles in sintering process[J]. Iron and Steel, 2021, 56(12): 28-35.
[1] 蒋硕, 李喆. 天津联合特钢有限公司910 mm厚料层烧结生产实践[J]. 南方金属, 2017(4): 56. (JIANG Shuo, LI Zhe. Production practice of 910 mm thick bed sintering in Tianjin United Special Steel Co., Ltd.[J]. Southern Metal, 2017(4): 56.) [2] 张群山, 郑兴荣, 徐冰, 等. 马钢380 m2烧结机“小风量、低负压、超厚料层”技术创新实践[J]. 烧结球团, 2017, 42(3): 36. (ZHANG Qun-shan, ZHENG Xing-rong, XU Bing, et al. Technological innovation practice of "Small Air Volume, Low Negative Pressure and Super Thick Material Layer" of Magang 380 m2 sintering machine[J]. Sintering and Pelletizing, 2017, 42 (3): 36.) [3] 郑向国, 杨小建, 陈国涛, 等. 青特钢850 mm厚料层烧结生产实践[J]. 山东冶金, 2017, 39(1): 12. (ZHENG Xiang-guo, YANG Xiao-jian, CHEN Guo-tao, et al. Practice of 850 mm thick bed sintering in Qingte Steel[J]. Shandong Metallurgy, 2017, 39 (1): 12.) [4] 程峥明, 宁文欣, 潘文, 等. 超厚料层均质烧结技术的研究与应用[J]. 烧结球团, 2019, 44(4): 7. (CHENG Zheng-ming, NING Wen-xin, PAN Wen, et al. Research and application of homogeneous sintering technology with super thick bed[J]. Sintering and Pelletizing, 2019, 44 (4): 7.) [5] 张建良, 阚永海, 张士军, 等. 全活性石灰强化烧结技术在超厚料层中的应用[J]. 钢铁, 2020, 55(8): 56. (ZHANG Jian-liang, KAN Yong-hai, ZHANG Shi-jun, et al. Application of full active lime intensified sintering technology in ultra-thick layer[J]. Iron and Steel, 2020, 55(8): 56.) [6] 龙红明, 范晓慧, 毛晓明, 等. 基于传热的烧结料层温度分布模型[J]. 中南大学学报(自然科学版), 2008, 39(3): 436. (LONG Hong-ming,FAN Xiao-hui, MAO Xiao-ming, et al. The model of temperature distribution of sintering layer based on heat transfer[J]. Journal of Central South University(Natural Science), 2008, 39(3): 436.) [7] 王海东, 余海钊, 范晓慧, 等. 铁矿烧结过程能耗数学模型的研究进展[J]. 钢铁, 2018, 53(10):1. (WANG Hai-dong, YU Hai-zhao, FAN Xiao-hui, et al. Research progress on mathematical model of energy consumption in iron ore sintering process [J]. Iron and Steel, 2018, 53 (10): 1.) [8] 岩見友司, 山本哲也, 大山伸幸. 焼結層内におけるマグネタイトの偏析制御による焼結鉱の生産性改善[J]. 鉄と鋼, 2017, 103(6):89. [9] 裴元东, 史凤奎, 安钢, 等. 京唐550 m2烧结机台车上物料和烧结矿分区研究(Ⅰ)[J]. 烧结球团, 2013, 38(1): 9. (PEI Yuan-dong, SHI Feng-kui, AN Gang, et al. Study on the partition of materials and sinter ore on the 550 m2 sintering machine trolley of Beijing Tang Dynasty (I)[J]. Sintering and Pelletizing, 2013, 38 (1): 9.) [10] 裴元东, 史凤奎, 安钢, 等. 京唐550 m2烧结机台车上物料和烧结矿分区研究(Ⅱ)[J]. 烧结球团, 2013, 38(2): 14. (PEI Yuan-dong, SHI Feng-kui, AN Gang, et al. Study on the partition of materials and sinter ore on the 550 m2 sintering machine trolley of Beijing Tang Dynasty(Ⅱ)[J]. Sintering and Pelletizing, 2013, 38 (2): 14.) [11] 陈子罗, 张建良, 张亚鹏, 等. 烧结矿适宜的SiO2质量分数和碱度[J]. 钢铁, 2016, 51(12):8. (CHEN Zi-luo, ZHANG Jian-liang,ZHANG Ya-peng, et al. The suitable SiO2 mass fraction and alkalinity of sinter[J]. Iron and Steel, 2016, 51 (12): 8.) [12] 妥建德, 侯名强, 付光军. 高硅烧结矿适宜碱度及经济性[J]. 钢铁, 2018, 53(3):16. (TUO Jian-de, HOU Ming-qiang, FU Guang-jun. Suitable basicity and economy of high silicon sinter[J]. Iron and steel, 2018, 53 (3): 16.) [13] 胡长庆, 王晓磊, 师学峰, 等. MgO及碱度对FeOx-SiO2-CaO-MgO-Al2O3体系液相生成的影响[J]. 钢铁, 2020, 55(4): 27. (HU Chang-qing, WANG Xiao-lei, SHI Xue-feng, et al. Effect of MgO and basicity on liquid phase formation of FeOx-SiO2-CaO-MgO-Al2O3 system[J]. Iron and Steel, 2020, 55(4): 27.) [14] 龙红明, 左俊, 王平, 等. 厚料层烧结高度方向均质性研究[J]. 烧结球团, 2013, 38(4): 1. (LONG Hong-ming, ZUO Jun, WANG Ping, et al. Study on homogeneityin the vertical direction of thick bed sintering [J]. Sintering and Pelletizing, 2013, 38 (4): 1.) [15] 向小平, 刘武杨, 李东升, 等. 柳钢烧结矿的化学成分及显微结构分析[J]. 烧结球团, 2020, 45(2): 21. (XIANG Xiao-ping, LIU Wu-yang, LI Dong-sheng, et al. Analysis of chemical composition and microstructure of the sinter in Liugang[J]. Sintered and Pelletizing, 2020, 45 (2): 21.) [16] Venkataramana R,Gupta S S,Kapur P C. A combined model for granule size distribution and cold bed permeability in the wet stage of iron ore sintering process[J]. International Journal of Mineral Processing, 1999, 57(1):43. [17] 赵士奇, 裴元东, 范正赟, 等. 基于离散元的烧结九辊布料过程仿真[J].钢铁, 2019, 54(1):14. (ZHAO Shi-qi, PEI Yuan-dong, FAN Zheng-yun, et al. Simulation of sintering nine roller feeding process based on discrete element method [J]. Iron and Steel, 2019, 54 (1): 14.) [18] Rikio Soda, Akira Sato, Junya Kano, et al. Analysis of granules behavior in continuous drum mixer by DEM[J]. ISIJ International, 2009, 49(1):645. [19] 山口泰英, 上城親司, 松村勝. 焼結原料造粒における複合造粒ライン粉核比が造粒物の構造に及ぼす影響[J]. 鉄と鋼, 2017, 103(6):18. [20] 王炜, 徐维波, 朱航宇, 等. 高碱度烧结矿的三维矿相特性分析[J]. 钢铁研究学报, 2016, 28(11):6. (WANG Wei, XU Wei-bo, ZHU Hang-yu, et al. Three dimensional phase characteristics analysis of high basicity sinter[J]. Journal of Iron and Steel Research, 2016, 28 (11): 6.) [21] Kenichi Higuchi, Tsuyoshi Tanaka, Takehiko Sato. Reaction behavior of dolomite accompanied with formation of magnetite solid solution in iron ore sintering process[J]. ISIJ International, 2007, 47(5):669. [22] 王天雄, 丁成义, 吕学伟. 烧结原料理论液相量对烧结矿质量的影响[J]. 钢铁研究学报, 2016, 28(9):28. (WANG Tian-xiong, DING Cheng-yi, LÜ Xue-wei. Influence of theoretical liquid phase of sintering raw materials on sinter quality [J]. Journal of Iron and Steel Research, 2016, 28 (9): 28.)
2021, Vol. 56 
