Effect of high-sulfur concentrate on properties of sinter
WANG Gui-lin1, ZHANG Jian-liang1, LIU Zheng-jian1, WANG Yao-zu2, LIU Fu-cheng3, TONG Zhen3
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Institute of Artificial Intelligence, University of Science and Technology Beijing, Beijing 100083, China; 3. Technical Quality Control Department, Lingyuan Iron and Steel Co., Ltd., Lingyuan 122500, Liaoning, China
Abstract：Concentrate is widely used in iron ore sintering process because its higher grade than that of imported ore-rich powder. However, there are few studies about the effect of high-sulfur concentrate on properties of sinter. Therefore, in order to study the effects of high-sulfur concentrate on the properties of sinter and influence of S element in concentrate on sintering process, a series of sinter cup experiments with high-sulfur concentrate concentration of 25%-45% were carried out, and the influences were characterized through microstructure, sintering indices, and metallurgical properties. The experimental results showed that when the concentration of concentrates was 25%, the interface reaction conditions of reduction were poor, and the diffusion of reduction gas were hindered by silicate phase. This resulted in a lower reduction index with 77.80%, the initial softening temperature was 1 200 ℃, and the permeability of cohesive zone deteriorated. The concentrates with 30% increased the sintering utilization index to 1.19 t/(m2·h), and improved vertical sintering speed to 22.22 mm/min. The sinter with high-sulfur concentrate concentration of 40% had improved reduction property and deteriorated the low temperature reduction degradation property. When the concentration was 45%, the sintering utilization index was the highest with 1.20 t/(m2·h), the reduction performance and reduction degradation property were suitable. On the whole, an appropriate increase in high-sulfur concentrate content was beneficial to improve the reduction performance and softening-melting performance of the sinter, but when the concentrate ratio was 45%, the S-value was 281.02 kPa·℃, meaning poor permeability performance of sinter. In the terms of sintering flue gas, when concentration of concentrates was 40%, the CO2 and NOx content of sintering flue gas were high, showing a high oxidizing atmosphere in the sintering process, which decreased the content of low-reducibility minerals such as iron olivine in the sinter and deteriorated the reduction degradation index. The results of flue gas analysis showed that the S element of high-sulfur concentrate basically entered sintering flue gas during sintering process, and the performance of sinter was not deteriorated.
王桂林, 张建良, 刘征建, 王耀祖, 刘福成, 佟振. 高硫精矿配比对烧结矿性能的影响[J]. 钢铁, 2022, 57(2): 19-27.
WANG Gui-lin, ZHANG Jian-liang, LIU Zheng-jian, WANG Yao-zu, LIU Fu-cheng, TONG Zhen. Effect of high-sulfur concentrate on properties of sinter[J]. Iron and Steel, 2022, 57(2): 19-27.
[1] 翟晓波,吴胜利,阙志刚,等. 加拿大铁精粉对烧结体固结强度的影响及其改善方法[J]. 钢铁,2019, 54(6): 27. (ZHAI Xiao-bo, WU Sheng-li, QUE Zhi-gang, et al. Effect of Canadian iron concentrate on bonding strength of sinter body and thereof improvement method[J]. Iron and Steel, 2019, 54(6): 27.) [2] 朱德庆,王志远,徐小锋,等. 润磨强化镜铁精粉烧结特性的研究[J]. 钢铁, 2007, 4(1): 12. (ZHU De-qing, WANG Zhi-yuan, XU Xiao-feng, et al. Improvement of sintering behaviors of Brazilian specularite concentrate by damp milling[J]. Iron and Steel, 2007, 4(1): 12.) [3] Clout J M F, Manuel J R. Fundamental investigations of differences in bonding mechanisms in iron ore sinter formed from magnetite concentrates and hematite ores[J]. Powder Technology, 2003, 130(1): 393. [4] 王永红,孙立伟,于原浩,等. 不同SiO2质量分数精粉对烧结指标的影响[J]. 中国冶金, 2019, 29(5): 10. (WANG Yong-hong, SUN Li-wei, YU Yuan-hao, et al. Influence of different SiO2 mass fraction of fine powder on sinter index [J]. China Metallurgy, 2019, 29(5): 10.) [5] Nkogatse T, Garbers-Craig A. Evaluation of iron ore concentrate and micropellets as potential feed for sinter production [J]. Mineral Processing and Extractive Metallurgy Review, 2021, https://www.tandfonline.com/doi/full/10.1080/08827508.2020.1857249. [6] 王义芳,王五经,刘正平,等. 巴西精矿粉的烧结试验与生产[J]. 钢铁,2000, 4(12): 1. (WANG Yi-fang, WANG Wu-jing, LIU Zheng-ping, et al. Sintering experiment and production of Brazilian concentrate[J]. Iron and Steel, 2000, 4(12): 1.) [7] 张建良,刘东辉,刘浩,等. 核矿石对低钛型钒钛磁铁精矿烧结制粒的影响[J]. 钢铁, 2017, 52(9): 16. (ZHANG Jian-liang, LIU Dong-hui, LIU Hao, et al. Effects of nuclei ores on granulation behavior of low-titanium magnetite concentrate [J]. Iron and Steel, 2017, 52(9): 16.) [8] 刘东辉,张建良,王广伟,等. 生石灰吸水特性对钒钛磁铁精粉烧结制粒的影响[J]. 烧结球团, 2020, 45(1): 20. (LIU Dong-hui, ZHANG Jian-liang, WANG Guang-wei, et al. Effects of water absorbing characteristics of quicklime on granulation of the vanadium titano-magnetite concentrate fines[J]. Sintering and Pelletizing, 2020, 45(1): 20.) [9] 李想. 钒钛磁铁矿烧结优化配矿研究[D]. 沈阳:东北大学, 2018. (LI Xiang. Investigation on Ore-Proportioning Optimization Technique with Vanadium and Titanium Magnetite Ores in Sintering[D]. Shenyang: Northeastern University,2019.) [10] 何占伟,薛向欣. 典型钒钛磁铁矿的烧结基础特性[J]. 钢铁,2020, 55(5): 27. (HE Zhan-wei, XUE Xiang-xin, Basic sintering characteristics of several typical vanadium titanium magnetite[J]. Iron and Steel, 2020, 55(5): 27.) [11] 胡熊. 高比例钒钛粉烧结技术研究及应用[J]. 重庆科技学院学报(自然科学版),2021, 23(2): 111. (HU Xiong. Reaearch and application of sintering technology of high proportion vanadium-titanium powder[J]. Journal of Chongqing University of Science and Technology (Natural Sciences), 2021, 23(2): 111.) [12] 马黎明,张建良,吴胜利,等. 基于熔剂性生球的复合造块工艺处理钒钛磁铁矿[J]. 钢铁研究学报, 2020, 32(6): 462. (MA Li-ming, ZHANG Jian-liang, WU Sheng-li, et al. Treatment of vanadium-titanium magnetite based on fluxed green ball composite agglomeration process[J]. Journal of Iron and Steel Research, 2020, 32(6): 462.) [13] 魏刚. 强化钒钛磁铁精矿烧结试验研究[J]. 烧结球团, 2020, 45(2): 5. (WEI Gang. Experimental research on strengthening sintering of V-bearing titaniferous magnetite concentrate[J]. Sintering and Pelletizing, 2020, 45(2): 5.) [14] 贺淑珍,冯焕林. 高比例精矿粉对烧结的影响分析及强化措施探讨[J]. 中国冶金, 2014, 24(7): 27. (HE Shu-zhen, FENG Huan-lin. Anylysis of the effects of high proportion iron concentrate on sinter quality and discussion of strengthening measures[J]. China Metallurgy, 2014, 24(7): 27.) [15] Wang Zhe, Pinson D, Chew S, et al. Behavior of New Zealand ironsand during iron ore sintering[J]. Metallurgical and Materials Transactions B, 2016, 47(1): 330. [16] Dehghan-manshadi A, Manuel J, Hapugoda S, et al. Sintering characteristics of titanium containing iron ores[J]. ISIJ International, 2014, 54(10): 2189. [17] WANG Yao-zu, ZHANG Jian-liang, LIU Zheng-jian, et al. Co-utilization of converter sludge-containing dedust wastewater in iron ore sintering to save fresh water, enhance quality and reduce pollution[J]. Journal of Cleaner Production, 2019, 234: 157. [18] 包头钢铁稀土公司,长沙黑色冶金矿山设计研究院.GB/T 13241—1991 铁矿石还原性的测定方法[S].北京:中国标准出版社,1991. (Baotou Iron and Steel Rare Earth Co., Changsha Ferrous Metal Mine Design and Research Insitute.GB/T 13241—1991 Iron Ores-Determination of Reducibility[S]. Beijing:Standards Press of China,1991.) [19] 宝山钢铁股份有限公司.GB/T 24204—2009 高炉炉料用铁矿石低温还原粉化率的测定动态试验法[S]. 北京:中国标准出版社,2009. (Baoshan Iron and Steel Co., Ltd. GB/T 24204—2009 Iron Ores for Blast Furnace Feedstocks-Determination of Low-Temperature Reduction Disintegration Indices by Dynamic Method[S]. Beijing:Standards Press of China,2009.) [20] 赵勇,吴铿,潘文,等. 分段法研究烧结矿还原的动力学过程[J]. 东北大学学报(自然科学版),2013, 34(9): 1282. (ZHAO Yong, WU Keng, PAN Wen, et al. Investigation of the reduction kinetics process of sinter ore by sectional stepwise method[J]. Journal of Northeastern University (Natural Science), 2013, 34(9): 1282.) [21] 赵霞,潘文,李铁军. 铁矿石还原气-固还原行为研究现状[J]. 中国冶金, 2013, 23(4): 1. (ZHAO Xia, PAN Wei, LI Tie-jun. Overview of research of gas-solid reduction of iron ore[J]. China Metallurgy, 2013, 23(4): 1.) [22] YANG S, ZHOU M, XUE X, et al. Isothermal reduction kinetics of chromium-bearing vanadium-titanium sinter reduced with CO gas at 1 173 K[J]. JOM, 2019, 71(8): 2812. [23] 王希珍,李宪文,周国凡,等. 高碱度烧结矿高温还原过程动力学研究[J]. 炼铁, 1986, 4(5): 1. (WANG Xi-zhen, LI Xian-wen, ZHOU Guo-fan, et al. Study on the kinetics of high-alkalinity sinter in high-temperature reduction process [J]. Ironmaking, 1986, 4(5): 1.) [24] 郑安阳,刘征建,苍大强,等. MgO对含钛烧结矿矿相结构及软熔滴落性能的影响[J]. 工程科学学报,2018, 40(2): 184. (ZHENG An-yang, LIU Zheng-jian, CANG Da-qiang, et al. Effects of MgO on the mineral structure and softening-melting property of Ti-containing sinter[J]. Chinese Journal of Engineering, 2018, 40(2): 184.) [25] WANG Gui-lin, KANG Jian, ZHANG Jian-liang, et al. Softening-melting behavior of mixed burden based on low-magnesium sinter and fluxed pellets[J]. International Journal of Minerals, Metallurgy and Materials, 2021, 28(4): 621. [26] 陈许玲,郑如月,范晓慧,等. 烟气循环烧结过程料层温度及NOx排放模型[J]. 钢铁,2020, 55(2): 23. (CHEN Xu-ling, ZHENG Ru-yue, FAN Xiao-hui, et al. Numerical simulation model of temperature and NOx emission in flue gas circulating sintering process[J].Iron and Steel, 2020, 55(2): 23.) [27] 胡长庆,李炳军,韩涛. 铁矿粉烧结过程CO与NO协同控制技术研究现状[J]. 河北冶金,2021, 4(4): 1. (HU Chang-qing, LI Bing-jun, HAN Tao. Rearch status of CO and NO cooperative control technology during iron ore sintering process[J]. Hebei Metallurgy, 2021, 4(4): 1.)
2022, Vol. 57 
