预处理褐铁矿零膨润土成球机理

doi:10.13228/j.boyuan.issn1006-9356.20230494

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Abstract In order to broaden the range of raw materials in pellet and reduce production costs, a wet ball milling process was used to pretreat the relatively inexpensive limonite powder for pellet production. The result shows that the limonite powder cannot be directly used in pellet production after pretreatment because the burst temperature is lower than 300 ℃ and the strength of finished pellet is lower than 1 300 N/P. 25% limonite ball milled for 15 min is mixed with 75% magnetite concentrate, in the case of zero bentonite, the dropping strength of green pellet reaches 4.1 times (0.5 m), the burst temperature is 420 ℃, and the strength of finished pellet is 2 445 N/P. The research on balling mechanism of pretreated limonite without bentonite shows that the static pelletizing index and specific surface area of limonite after pretreatment are the key parameters to realize pelletizing without bentonite. After wet ball milling for 15 min, the specific surface area of limonite reaches 1 591.10 cm²/g, and the static pelletizing index reaches 1.42. Due to the higher temperature required for bound water and the recrystallization of primary Fe₂O₃, the compressive strength of the pellet by limonite alone is generally lower. After mixing with magnetite concentrate, the oxidation heat of magnetite during roasting is conducive to the recrystallization of Fe₂O₃, forming a relatively complete hematite crystal, and a large amount of slag phase is formed and fills in the gap, then the compressive strength of the pellet increases. However, when the proportion of limonite is greater than 25%, the pores in the pellets gradually increase, the oxidation heat gradually decreases, and the amount of liquid phase generated in the pellets decreases by 28%, then the compressive strength of the pellets decreases. In general, the optimal process parameters can be obtained when the limonite is wet ball milled for 15 min and its adding ratio is 25%. This study can provide important reference for pellet production to reduce the amount of bentonite, improve pellet grade and reduce production costs.

Key words： ball milling pretreatment limonite pellet performance bentonite hematite

Received: 25 August 2023

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	LI Xingwang
	LIU Tong
	ZHANG Junjie
	JIA Laihui
	LEI Jie
	LONG Hongming

Cite this article:

LI Xingwang,LIU Tong,ZHANG Junjie等. Pelletizing mechanism of pretreated limonite without bentonite[J]. China Metallurgy, 2024, 34(1): 10-17.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20230494 OR http://www.zgyj.ac.cn/EN/Y2024/V34/I1/10

[1]	王新东,金永龙. 高炉使用高比例球团的战略思考与球团生产的试验研究[J]. 钢铁,2021,56(5):7.(WANG X D,JIN Y L. Strategy analysis and testing study of high ratio of pellet utilized in blast furnace[J]. Iron and Steel,2021,56(5):7.)
[2]	YANG T,AN J S,LI X W,et al. Effect of quaternary basicity on reduction behavior of iron-bearing dust pellets[J]. Journal of Iron and Steel Research International,2023,30(7):1356.
[3]	WU T,KONG Y Q,ZHANG J C,et al. Agglomeration and bonding mechanism of typical metallurgical solid wastes[J]. Journal of Iron and Steel Research International,2023,30(7):1390.
[4]	任杰,罗果萍,朱建国,等. 含铁添加剂代替膨润土对球团矿性能的影响[J]. 矿冶工程,2022,42(4):106.(REN J,LUO G P,ZHU J G,et al. Effect of iron-containing additive as substitute for bentonite on pellet properties[J]. Mining and Metallurgical Engineering,2022,42(4):106.)
[5]	李骞,马永和,唐银华,等. 铁矿球团用有机黏结剂研究进展[J]. 钢铁,2022,57(11):11.(LI Q,MA Y H,TANG Y H,et al. Research progress of organic binder for iron ore pellets[J]. Iron and Steel,2022,57(11):11.)
[6]	王泽平,周隆林,莫伟,等. 冶金球团用膨润土国内外研究进展[J]. 矿产综合利用,2023(1):133.(WANG Z P,ZHOU L L,MO W,et al. Research progress of bentonite used in metallurgical pellets in China and abroad[J]. Multipurpose Utilization of Mineral Resources,2023(1):133.)
[7]	韦东,胡钺,胡梦杰,等. 不同种类膨润土对球团性能影响的试验与应用[J]. 烧结球团,2023,48(2):52.(WEI D,HU Y,HU M J,et al. Experiment and application of effect of different types of bentonite on performance of pellets[J]. Sintering and Pelletizing,2023,48(2):52.)
[8]	李志超,王宇,柴轶凡,等. 膨润土对白云鄂博铁精矿球团矿生球及成品球强度影响[J]. 中国冶金,2021,31(4):19.(LI Z C,WANG Y,CHAI Y F,et al. Effect of bentonite on strength of raw pellets and finished pellets prepared from Baiyun Obo iron concentrate[J]. China Metallurgy,2021,31(4):19.)
[9]	张国成,罗果萍,邬虎林,等. 配加蒙古精矿对球团矿性能的影响[J]. 中国冶金,2019,29(11):24.(ZHANG G C,LUO G P,WU H L,et al. Effects of adding Mongolian concentrate on pellets properties[J]. China Metallurgy,2019,29(11):24.)
[10]	周友连,许斌,李骞,等. 复合添加剂对赤铁矿球对赤铁矿球团性能影响的机理研究[J]. 矿冶工程,2011,31(1):66.(ZHOU Y L,XU B,LI Q,et al. Mechanism research for influence of compound additives on the properties of hematite pellets[J]. Mining and Metallurgical Engineering,2011,31(1):66.)
[11]	李金莲,刘万山,任伟,等. 配加高铁赤泥降低球团矿膨润土用量的研究[J]. 烧结球团,2012,37(3):31.(LI J L,LIU W S,REN W,et al. Experiment study on decreasing bentonite consumption of pellets by adding high iron red mud[J]. Sintering and Pelletizing,2012,37(3):31.)
[12]	韦振宁,甘牧原,墙蔷,等. 有机复合膨润土对铁矿球团生产影响的研究[J]. 烧结球团,2022,47(5):33.(WEI Z N,GAN M Y,QIANG Q,et al. Research on effect of organic composite bentonite on iron ore pellet production[J]. Sintering and Pelletizing,2022,47(5):33.)
[13]	李金莲,任伟,张立国,等. 降低球团用膨润土配比的研究[J]. 鞍钢技术,2015(3):12.(LI J L,REN W,ZHANG L G,et al. Study on decreasing proportioning ratio of bentonite in pellets[J]. Angang Technology,2015(3):12.)
[14]	范晓慧,田志远,甘敏,等. 细粒磁铁精矿球团孔隙结构的优化研究[J]. 矿冶工程,2018,38(1):71.(FAN X H,TIAN Z Y,GAN M,et al. Optimization of pore structure of fine-grained magnetite concentrate pellets[J]. Mining and Metallurgical Engineering,2018,38(1):71.)
[15]	韩凤光,杨涛,赵贺喜,等. 复合粘结剂对球团高温固结的影响及机理[J]. 工程科学学报,2023,45(9):1450.(HAN F G,YANG T,ZHAO H X,et al. Effects and mechanism of composite binder on high-temperature consolidation of pellets[J]. Chinese Journal of Engineering,2023,45(9):1450.)
[16]	于洪军,路明,王兴锋,等. 铁矿粉粒度组成对球团矿性能影响的研究进展[J]. 冶金能源,2022,41(1):21.(YU H J,LU M,WANG X F,et al. Research progress on the effect of iron fine particle size on pellet properties[J]. Energy For Metallurgical Industry,2022,41(1):21.)
[17]	田野,吕庆,刘小杰,等. PMC精矿粉细磨粒度对球团质量的影响[J]. 矿冶工程,2017,37(1):85.(TIAN Y,LV Q,LIU X J,et al. Effect of grinding fineness of PMC on qualities of pellets[J]. Mining and Metallurgical Engineering,2017,37(1):85.)
[18]	温宝良,张晓萍,刘德楼,等. 含硼磁铁矿对超细粒级磁铁矿球团性能的影响[J]. 钢铁,2022,57(11):33.(WEN B L,ZHANG X P,LIU D L,et al. Effect of boron-containing magnetite on properties of ultrafine-grained magnetite pellets[J]. Iron and Steel,2022,57(11):33.)
[19]	彭道胜,潘建,李军,等. 细磨卡粉制备熔剂性球团的试验研究[J]. 烧结球团,2021,46(4):50.(PENG D S,PAN J,LI J,et al. Experimental research on preparation of fluxed pellets from fine grinding Carajas powder[J]. Sintering and Pelletizing,2021,46(4):50.)
[20]	李亚飞,杨涛,刘在春,等. 高压辊磨对含硫酸渣超细铁精粉生球性能的影响[J]. 钢铁研究学报,2022,34(7):639.(LI Y F,YANG T,LIU Z C,et al. Effect of high pressure roller grinding on green pellets properties of ultra-fine iron concentrate containing pyrite cinder[J]. Journal of Iron and Steel Research,2022,34(7):639.)
[21]	许宝科,胡文祥,易安南,等. 高压辊磨机边料循环工艺在球团生产中的应用[J]. 中国冶金,2021,31(8):49.(XU B K,HU W X,YI A N,Application of high pressure grinding roller edge recycle process in pellet production[J]. China Metallurgy,2021,31(8):49.)
[22]	GUO Y F,LIU K,CHEN F,et al. Effect of high-pressure grinding rolls pretreatment on the preparation of vanadium-titanium magnetite pellets[J]. Journal of Materials Research and Technology,2023,23:2479.
[23]	王殊. 高压辊磨活化钒钛磁铁矿及强化球团矿制备的基础研究[D]. 长沙:中南大学,2022. (WANG S. Fundamental Research on the Activation of Vanadium Titanomagnetite by High Pressure Roller Mill and Strengthening the Preparation of Pellet[D]. Changsha:Central South University,2022.)
[24]	连军峰,王玉梅,田长磊,等. 球团停用润磨机下粗粒度铁精粉消耗比例提升实践[J]. 新疆钢铁,2022(4):17.(LIAN J F,WANG Y M,TIAN C L,et al. Practice of increasing the consumption proportion of coarse iron concentrate powder under the ball mill[J]. Xinjiang Iron and Steel,2022(4):17.)
[25]	刘山平,马磊,宋云锋,等. 带式焙烧机球团原料预处理工艺优化[J]. 钢铁,2023,58(6):36.(LIU S P,MA L,SONG Y F,et al. Optimization of pretreatment process of pelletizing raw materials in belt roasters[J]. Iron and Steel,2023,58(6):36.)
[26]	侯健,白晨光,扈玫珑,等. 南非PMC精粉与两种典型褐铁矿的配矿优化[J]. 钢铁,2023,58(6):45.(HOU J,BAI C G,HU M L,et al. Optimization on ore-blending of PMC concentrate and two typical limonite ores[J]. Iron and Steel,2023,58(6):45.)
[27]	张国成,罗果萍,柴轶凡,等. 褐铁矿在烧结工艺中的优化配置[J]. 工程科学学报,2022,44(1):39.(ZHANG G C,LUO G P,CHAI Y F,et al. Optimal allocation of limonite in sintering process[J]. Chinese Journal of Engineering,2022,44(1):39.)
[28]	姜涛. 铁矿造块学[M]. 长沙:中南大学出版社,2016.(JIANG T. Principle and Technology of Agglomeration of Iron Ores[M]. Changsha:Central South University Press,2016.)
[29]	张汉泉. 烧结球团理论与工艺[M]. 北京:化学工业出版社,2015. (ZHANG H Q. Sintering and Pelletizing Theory and Process[M]. Beijing:Chemical Industry Press,2015.)
[30]	LEI J,GAO X,AN J S,et al. Drop strength measurement of green pellet based on drop-rebound mechanism[J]. Journal of Iron and Steel Research International,2023,30(11):2143.
[31]	雷杰,汪名赫,周江虹,等. 新型复合粘结剂提高生球质量的作用机理及构效关系[J]. 工程科学学报,2023,45(1):91. (LEI J,WANG M H,ZHOU J H,at el. Mechanism and structure-activity relationship of a new composite binder to improve the quality of green pellets[J]. Chinese Journal of Engineering,2023,45(1):91.)