Effect of magnesium oxide and its occurrence on the roasting and metallurgical performance of magnetite pellets

ZHU De-qing; LIU Zhen; YANG Cong-cong; PAN Jian

doi:10.13374/j.issn2095-9389.2020.07.02.006

Volume 43 Issue 8

Aug. 2021

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ZHU De-qing, LIU Zhen, YANG Cong-cong, PAN Jian. Effect of magnesium oxide and its occurrence on the roasting and metallurgical performance of magnetite pellets[J]. Chinese Journal of Engineering, 2021, 43(8): 1116-1124. doi: 10.13374/j.issn2095-9389.2020.07.02.006

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ZHU De-qing, LIU Zhen, YANG Cong-cong, PAN Jian. Effect of magnesium oxide and its occurrence on the roasting and metallurgical performance of magnetite pellets[J]. Chinese Journal of Engineering, 2021, 43(8): 1116-1124. doi: 10.13374/j.issn2095-9389.2020.07.02.006

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Effect of magnesium oxide and its occurrence on the roasting and metallurgical performance of magnetite pellets

doi: 10.13374/j.issn2095-9389.2020.07.02.006

School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China

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Corresponding author: E-mail: 13397369222@163.com
Received Date: 2020-07-02
Available Online: 2020-09-08
Publish Date: 2021-08-25

Abstract

Abstract

Increased Al₂O₃ content in blast furnace slag in China presents adverse effects in blast furnace smelting. In response to this problem and to improve fluidity of blast furnace slag, MgO pellets are added. Blast furnace can be operated smoothly, but on the other hand, higher MgO content is unfavorable to the pelletizing property and pellet roasting performance of raw materials. Five kinds of pellets containing high-magnesium magnetite, forsterite, dolomite, magnesite, and magnesia powder, respectively, were made to investigate the effect of MgO content and its occurrence on induration behavior and metallurgical performance of pellets. Results show that various magnesium-containing fluxes have different influences on the quality of green balls. Both magnesia powder and high-magnesium magnetite can improve the drop numbers of green balls, which is due to their chemical properties and specific surface areas. With fixed firing temperature and time, increasing MgO content leads to lowered compressive strength of the preheated and fired pellets, with the lowest impact from dolomite observed. With the oxidation degree elevation of preheated pellets, compressive strength of roasted pellets improves, which indicates that we can increase the preheating time in actual production to improve the roasting performance of magnesium magnetite pellets. Under the same source of MgO, increasing MgO content will lead to an increase in porosity of pellets, which presents a negative effect on the strength of pellets. For five kinds of fired pellets, increased MgO content improves the reduction swelling index, low temperature degradation indices, and reduction degree. The reduction swelling index and low temperature degradation indices of pellets with high-magnesium magnetite are observed to be better than those of other magnesium-containing pellets.
- magnetite pellets,
- MgO content,
- MgO sources,
- roasting behaviour,
- metallurgical performance

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References(27)

References

[1]	Sahoo S K, Tiwari J N, Mishra B, et al. Prediction of flow characteristics of Al₂O₃–CaO–MgO–SiO₂–TiO₂-type blast furnace slag and its evaluation. Arab J Sci Eng, 2019, 44(7): 6393 doi: 10.1007/s13369-019-03878-8
[2]	呂學偉, 嚴志明, 龐正德, 等. A₂O₃對高爐渣物化性能和結構影響研究綜述. 鋼鐵, 2020, 55(2):1 Lü X W, Yan Z M, Pang Z D, et al. Effect of Al₂O₃ on physicochemical properties and structure of blast furnace slag: review. Iron Steel, 2020, 55(2): 1
[3]	劉小杰, 李建鵬, 劉頌, 等. MgO對高爐生產影響的研究現狀及其展望. 礦產綜合利用, 2019(2):16 doi: 10.3969/j.issn.1000-6532.2019.02.003 Liu X J, Li J P, Liu S, et al. Research and development for the effect of MgO on the blast furnace production. Multipurpose Util Miner Resour, 2019(2): 16 doi: 10.3969/j.issn.1000-6532.2019.02.003
[4]	姜鑫, 沈峰滿, 韓宏松, 等. 高爐渣適宜鎂鋁比分段管控的分析與應用. 鋼鐵, 2019, 54(10):12 Jiang X, Shen F M, Han H S, et al. Analysis and application of sectional control of w(MgO)/w(Al₂O₃) in blast furnace slag. Iron Steel, 2019, 54(10): 12
[5]	楊福, 吳志清, 程建文. w(MgO)對高爐高鋁渣高溫性能的影響. 鋼鐵研究, 2011, 39(1):4 Yang F, Wu Z Q, Cheng J W. Effects of w(MgO) on high temperature properties of high alumina blast furnace slag. Res Iron Steel, 2011, 39(1): 4
[6]	武軼, 劉自民, 李小靜, 等. 燒結礦中適宜MgO含量的研究. 鋼鐵研究, 2016, 44(3):6 Wu Y, Liu Z M, Li X J, et al. Study on suitable MgO content in sinter. Res Iron Steel, 2016, 44(3): 6
[7]	潘向陽, 龍躍, 李神子, 等. MgO/Al₂O₃對燒結礦冶金性能的影響. 鋼鐵釩鈦, 2019, 40(4):100 doi: 10.7513/j.issn.1004-7638.2019.04.019 Pan X Y, Long Y, Li S Z, et al. Effect of MgO/Al₂O₃ on metallurgical properties of sinter. Iron Steel Van Tit, 2019, 40(4): 100 doi: 10.7513/j.issn.1004-7638.2019.04.019
[8]	劉超, 張玉柱, 康月, 等. MgO含量對低硅燒結成礦性能的影響. 鑄造技術, 2017, 38(4):885 Liu C, Zhan Y Z, Kang Y, et al. Effect of MgO content on properties of low silicon sintering ore. Foundry Technol, 2017, 38(4): 885
[9]	鄭安陽, 劉征建, 蒼大強, 等. MgO對含鈦燒結礦礦相結構及軟熔滴落性能的影響. 工程科學學報, 2018, 40(02):184 Zheng A Y, Liu Z J, Cang D Q, et al. Effects of MgO on the mineral structure and softening-melting property of Ti-containing sinter. Chin J Eng, 2018, 40(02): 184
[10]	(陳前沖, 韓秀麗, 劉磊. 高堿度燒結礦礦相結構分布模式及形成機理. 工程科學學報, 2019, 41(02):181 Chen Q C, Han X L, Liu L. Distribution patterns and formation mechanisms of the mineralogical structure of high basicity sinter. Chin J Eng, 2019, 41(02): 181
[11]	嚴照照, 盧建光, 呂慶, 等. MgO對生球質量和球團礦抗壓強度的影響. 鋼鐵釩鈦, 2017, 38(6):98 doi: 10.7513/j.issn.1004-7638.2017.06.018 Yan Z Z, Lu J G, Lü Q, et al. Impact of magnesium oxide on the green ball quality and cruslring strength of pellets. Iron Steel Van Tit, 2017, 38(6): 98 doi: 10.7513/j.issn.1004-7638.2017.06.018
[12]	謝路奔. 含鎂球團焙燒固結強化及其機理研究[學位論文]. 長沙: 中南大學, 2012 Xie L B. Investigation on Strengthening Concretion of Magnesium Pellets and its Mechanism [Dissertation]. Changsha: Central South University, 2012
[13]	劉華, 向小平, 甘牧原, 等. 高鎂鐵精礦制備球團試驗研究. 燒結球團, 2019, 44(2):33 Liu H, Xiang X P, Gan M Y, et al. Experimental study on preparation of pellets using high MgO-bearing iron ore concentrate. Sinter Pelletiz, 2019, 44(2): 33
[14]	青格勒, 王朝東, 侯恩儉, 等. 低硅含鎂球團礦抗壓強度及冶金性能. 鋼鐵研究學報, 2014, 26(4):7 Qing G L, Wang C D, Hou E J, et al. Compressive strength and metallurgical property of low silicon magnesium pellet. J Iron Steel Res, 2014, 26(4): 7
[15]	徐晨光, 龍躍, 田鐵磊, 等. 高鎂堿性球團礦冶金性能試驗研究. 燒結球團, 2016, 41(1):36 Xu C G, Long Y, Tian T L, et al. Experimental study on metallurgical properties of high magnesia alkaline pellets. Sinter Pelletiz, 2016, 41(1): 36
[16]	范曉慧, 謝路奔, 甘敏, 等. 高鎂球團焙燒特性及其固結強化機理. 中南大學學報(自然科學版), 2013, 44(2):449 Fan X H, Xie L B, Gan M, et al. Roasting characteristics of magnesium pellets and mechanism of strengthening concretion. J Cent South Univ Sci Technol, 2013, 44(2): 449
[17]	朱德慶, 高子富, 潘建, 等. 堿度及MgO質量分數對球團焙燒及冶金性能的影響. 中南大學學報(自然科學版), 2013, 44(10):3963 Zhu D Q, Gao Z F, Pan J, et al. Influence of pellet basicity and MgO content on roasting and metallurgical properties of pellets. J Cent South Univ Sci Technol, 2013, 44(10): 3963
[18]	國家市場監督管理總局, 中國國家標準化管理委員會. GB/T 13240—2018高爐用鐵球團礦自由膨脹指數的測定. 北京: 中國標準出版社, 2018 State Administration for Market Regulation, Standardization Administration. GB/T 13240—2018 Iron Ore Pellets for Blast Furnace Feedstocks-Determination of the Free-Swelling Index. Beijing: Standards Press of China, 2018
[19]	中華人民共和國國家質量監督檢驗檢疫總局, 中國國家標準化管理委員會. GB/T 24189—2009高爐用鐵礦石用最終還原度指數表示的還原性的測定. 北京: 中國標準出版社, 2009 General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China, Standardization Administration. GB/T 24189—2009 Iron Ores for Blast Furnace Feedstocks-Determination of the Reducibility by the Final Degree of Reduction Index. Beijing: Standards Press of China, 2009
[20]	中華人民共和國國家質量監督檢驗檢疫總局, 中國國家標準化管理委員會. GB/T 24204—2009高爐爐料用鐵礦石低溫還原粉化率的測定--動態試驗法. 北京: 中國標準出版社, 2009 General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China, Standardization Administration. GB/T 24204—2009 Iron Ores for Blast Furnace Feedstocks - Determination of Low-Temperature Reduction-Disintegration Indices by Dynamic Method. Beijing: Standards Press of China, 2009
[21]	高強健. MgO基球團添加劑制備及對球團礦質量影響的機理研究[學位論文]. 沈陽: 東北大學, 2014 Gao Q J. Preparation of MgO Bearing Additive for Pellet and Mechanism Investigation of It on the Effect to Quality of Pellets [Dissertation]. Shenyang: Northeastern University, 2014
[22]	吳丹, 張文燕, 路紹琰, 等. 氧化鎂在不同體系中的水化研究. 鹽科學與化工, 2020, 49(3):31 doi: 10.3969/j.issn.2096-3408.2020.03.010 Wu D, Zhang W Y, Lu S Q, et al. Study on hydration of MgO in different systems. J Salt Chem Ind, 2020, 49(3): 31 doi: 10.3969/j.issn.2096-3408.2020.03.010
[23]	楊永斌, 張健, 鐘強, 等. 預處理強化赤鐵礦熔劑性球團制備性能的研究. 礦冶工程, 2019, 39(4):83 doi: 10.3969/j.issn.0253-6099.2019.04.020 Yang Y B, Zhang J, Zhong Q, et al. Effect of pretreatment on the ballability of hematite in preparation of a fluxed pellet. Min Metall Eng, 2019, 39(4): 83 doi: 10.3969/j.issn.0253-6099.2019.04.020
[24]	潘建, 于鴻賓, 朱德慶, 等. MgO來源對磁鐵精礦球團預熱行為的影響. 中南大學學報(自然科學版), 2016, 47(6):1823 doi: 10.11817/j.issn.1672-7207.2016.06.001 Pan J, Yu H B, Zhu D Q, et al. Influence of MgO sources on behavior of preheated pellets of magnetite concentrate. J Cent South Univ Sci Technol, 2016, 47(6): 1823 doi: 10.11817/j.issn.1672-7207.2016.06.001
[25]	高子富. 用于COREX的含鎂熔劑性球團制備及其還原行為研究[學位論文]. 長沙: 中南大學, 2013 Gao Z F. Preparation of Magnesium Flux Pellets and Its Reduction Behaviors in CORER Process [Dissertation]. Changsha: Central South University, 2013
[26]	Zhao Z L, Tang H Q, Guo Z C. Effects of CaO on precipitation morphology of metallic iron in reduction of iron oxides under CO atmosphere. J Iron Steel Res Int, 2013, 20(7): 16 doi: 10.1016/S1006-706X(13)60120-X
[27]	Cheng G J, Xue X X, Gao Z X, et al. Effect of Cr₂O₃ on the reduction and smelting mechanism of high-chromium vanadium-titanium magnetite pellets. ISIJ Int, 2016, 56(11): 1938 doi: 10.2355/isijinternational.ISIJINT-2016-234