提高全钒钛球团矿抗压强度技术研究与应用

胡鹏; 蒋胜; 谭阳杰; 周密; 向绍红

doi:10.7513/j.issn.1004-7638.2022.04.017

提高全钒钛球团矿抗压强度技术研究与应用

doi: 10.7513/j.issn.1004-7638.2022.04.017

胡鹏^1,,
蒋胜¹,
谭阳杰²,
周密³,
向绍红⁴

1.
攀钢集团研究院有限公司, 四川攀枝花 617000
2.
攀钢集团西昌钢钒有限公司, 四川西昌 615000
3.
东北大学冶金学院, 辽宁沈阳 110819
4.
攀枝花钢城集团有限公司, 四川攀枝花 617000

详细信息

作者简介:
胡鹏（1988—），男，四川广元人，工程师，副研究员，研究方向：铁矿石造块及高炉炼铁，E-mail：hupeng526417@163.com

中图分类号: TF046
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- 被引次数: 0
出版历程
- 收稿日期: 2021-10-24
- 刊出日期: 2022-09-14

Research and application of improving the compressive strength of full V-Ti pellets

1.
Pangang Group Research Institute Co., Ltd., Panzhihua 617000, Sichuan, China
2.
Pangang Group Xichang Iron&Steel Co., Ltd., Panzhihua 617000, Sichuan, China
3.
School of Metallurgy, Northeast University, Shenyang 110819, Liaoning, China
4.
Panzhihua Gangcheng Group Co., Ltd., Panzhihua 617000, Sichuan, China

摘要

摘要: 针对全钒钛球团矿抗压强度低（平均1 600 N/个左右）、波动大（最低仅926 N/个，最高2 287 N/个），进入高炉冶炼后极大的影响了高炉稳定顺行，特开展了提高全钒钛球团矿抗压强度技术研究与应用。结果表明：通过增设润磨设备后，造球混合料粒度小于0.074 mm粒级由66.64%提高至71.69%，矿物颗粒表面变粗糙，粘结性增加，活性增强；且将预热二段温度提高到900 ℃左右、降低链篦机机速、延长预热时间，将焙烧温度从1150 ℃提高至1200 ℃以上，降低回转窑转速，延长焙烧时间后，球团矿内部带直径降低至3 mm以下，抗压强度提高至1 989 N/个，波动明显减小，为高炉稳定顺行提供了原料基础。
- 全钒钛球团矿 /
- 抗压强度 /
- 焙烧温度 /
- 微观结构
Abstract: The low compressive strength (average 1 600 N/P) and large strength fluctuation (926 N/P min, 2287 N/P max) of V-Ti pellets greatly affect the stability and smooth operation of blast furnace after being smelted in blast furnace. The technical research and application of improving the compressive strength of full V-Ti pellets have been carried out. After utilizing wet grinding equipment, the proportion of pelletizing mixture less than 0.074 mm is increased from 66.64% to 71.69%. And the surface of mineral particles becomes rough. Besides, the cohesiveness and activity increases as result of installing wet grinding equipment. By increasing the temperature of second preheating stage to about 900 ℃ and reducing the grate speed to prolong the preheating time, at the same time increasing the roasting temperature from 1 150 ℃ to more than 1 200 ℃ and reducing the rotary kiln speed to prolong the roasting time, the diameter of inner zone of pellet can be reduced to less than 3 mm, and the compressive strength is increased to 1 989 N/P and its fluctuation become narrow.
- V-Ti pellet /
- compressive strength /
- roasting temperature /
- microstructure

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图 1 润磨前后混合料颗粒形貌

(a)润磨前； (b)润磨后

Figure 1. Particle morphology of mixture before and after wet grinding

下载: 全尺寸图片幻灯片

图 2 润磨时间对生球落下强度和抗压强度的影响

Figure 2. Effect of wet grinding time on wet knock and strength of green pellet

下载: 全尺寸图片幻灯片

图 3 预热温度和预热时间对球团氧化率的影响规律

Figure 3. Effect of preheating temperature and time on pellet oxidation rate

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图 4 预热温度和预热时间对球团抗压强度的影响规律

Figure 4. Effect of preheating temperature and time on pellet strength

下载: 全尺寸图片幻灯片

图 5 焙烧温度对球团抗压强度和FeO含量的影响规律

Figure 5. Effect of roasting temperature on strength and FeO content of pellet

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图 6 焙烧时间对球团抗压强度和FeO含量的影响规律

Figure 6. Effect of roasting time on strength and FeO content of pellet

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图 7 全钒钛球团宏观形貌

Figure 7. Macro-morphology of full V-Ti pellet

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图 8 全钒钛球团内部带和外部带的微观形貌

a-内部带；b-外部带P—孔；S—硅酸盐相；L—钛铁矿；H—赤铁矿

Figure 8. Micro-morphology of the inner and outer band

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图 9 工业应用前后抗压强度变化情况

Figure 9. Changes of compressive strength of pellet before and after technology optimization

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表 1 钒钛磁铁矿样品的主要化学成分及烧损

Table 1. Main chemical composition and Ig of sample V-Ti magnetite %

TFe	FeO	SiO₂	CaO	V₂O₅	TiO₂	MgO	Al₂O₃	Ig
55.22	29.46	4.15	0.80	0.707	9.99	3.80	3.85	−1.40
注：Ig为烧损量。

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表 2 钒钛磁铁矿样品的粒度组成

Table 2. Size distribution of sample V-Ti magnetite %

>0.15 mm	0.15～0.074 mm	0.074～0.045 mm	<0.045 mm	<0.074 mm
7.03	28.26	21.06	43.65	64.71

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表 3 膨润土的主要化学成分

Table 3. Main chemical composition of bentonite %

Fe₂O₃	SiO₂	CaO	Al₂O₃	MgO	K₂O	Na₂O	Ig
3.22	55.00	4.82	14.03	3.42	0.98	1.52	14.69

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表 4 膨润土的物理性能

Table 4. Physical properties of bentonite

胶质价/ %	膨胀容/ (mL·g⁻¹)	吸兰量(100 g计)/ g	pH值	粒度<0.074 mm的矿物含量/%
62.00	42.02	35.70	10.44	97.79

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表 5 润磨时间对混合料粒度组成的影响

Table 5. Effect of wet grinding time on size distribution of mixture

润磨时间/min	粒度组成/%
润磨时间/min	>0.15 mm	0.15～0.075 mm	0.074～0.045 mm	<0.045 mm	<0.074 mm
0	7.03	28.26	21.06	43.65	64.71
3	5.72	23.36	22.16	48.76	70.92
4	4.96	22.83	21.78	50.43	72.21
5	4.50	22.21	20.96	52.33	73.29
6	4.12	21.72	19.99	54.17	74.16

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表 6 不同焙烧温度的内部带直径

Table 6. Inner band diameter of pellet after roasting at different temperatures

焙烧温度/℃	内部带直径/mm
1150	5～8
1180	4～5
1200	3～4
1250	1～2
1280	0～1

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表 7 链篦机-回转窑热工制度优化情况

Table 7. Optimization of grate kiln thermal system

项目	链篦机机速 /(m·min⁻¹)	预热一段 /℃	预热二段 /℃	回转窑转速 /(r·min⁻¹)	窑头温度 /℃	窑中温度 /℃	窑尾温度 /℃
优化前	2.3	550～580	820～850	1.0	950～980	1150～1180	730～760
优化后	1.95	600～630	890～920	0.91	1070～1100	1220～1250	770～800

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