攀西钛矿球团焦炉煤气还原研究

叶恩东; 刘娟; 胡元金

doi:10.7513/j.issn.1004-7638.2021.01.005

攀西钛矿球团焦炉煤气还原研究

doi: 10.7513/j.issn.1004-7638.2021.01.005

1.
钒钛资源综合利用国家重点实验室，攀钢集团攀枝花钢铁研究院有限公司，四川攀枝花 617000
2.
攀钢集团钒钛资源股份有限公司，四川攀枝花 617022

详细信息

中图分类号: TF823
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出版历程
- 收稿日期: 2020-12-06
- 刊出日期: 2021-02-10

Study on reduction of panxi titanium ore pellets by coke oven gas

1.
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group Panzhihua Iron & Steel Research Institute Co., Ltd., Panzhihua 617000, Sichuan, China
2.
Pangang Group Vanadium & Titanium Resources Co., Ltd., Panzhihua 617022, Sichuan, China

摘要

摘要: 针对攀西钛精矿粒度细、直接入炉冶炼钛渣难的问题，提出细粒级钛矿制备钛矿球团，钛矿球团焦炉煤气还原，并与细粒级钛精矿开展对比试验研究。结果表明：钛矿球团通过预焙烧后出现微裂纹和孔洞，有利于气相还原反应的进行，当还原温度在950 ℃时，钛矿球团焦炉煤气还原4 h后，金属化率可达85%以上，还原过程中钛矿球团物相结构发生较大变化，其主要物相由铁板钛矿相变成金属铁相、金红石相和少量钛铁矿相；随着反应进行钛矿球团中金属Fe逐渐显现、呈星点状分布、随之长大，最后连接成片。为攀西细粒级钛精矿冶炼钛渣提供了一定理论支撑。
- 钛矿球团 /
- 焦炉煤气 /
- 还原 /
- 金属化率 /
- 物相
Abstract: Aiming at the problem that Panxi titanium concentrate is difficult to be directly added into furnace due to the fine particle size, the process of reducing the pellets prepared from the titanium ore by coke oven gas was proposed. And the comparative experiments between the pellets and titanium concentrate were also carried out. The results show that micro-cracks and holes appear in the titanium pellets after preroasting, which is favorable for the gas phase reduction reaction. At the reduction temperature of 950 ℃ for 4 h, the metallization rate of titanium ore pellets can reach more than 85%. During the reduction process, the phases of titanium ore pellets change greatly. The main phases change from pseudobrookite to metallic iron, rutile and a small amount of ilmenite. As the reaction progresses, the metallic Fe in the titanium ore pellets gradually appears with scattered distribution, and gradually grows into pieces. It provides theoretical support for smelting titanium slag from Panxi fine grade titanium concentrate.
- titanium ore pellets /
- coke oven gas /
- reduction /
- metallization rate /
- phase

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图 1 实验室煤气还原氧化球团装置

Figure 1. Device diagram of laboratory gas reduction of oxidized pellets

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图 2 钛矿氧化球团XRD谱

Figure 2. XRD pattern of oxidized titanium ore pellets

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图 3 细粒级钛精矿和氧化球团扫描电镜形貌

Figure 3. SEM of fine-grained titanium concentrate and oxidized pellets

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图 4 温度对球团金属化率的影响

Figure 4. Influence of temperature on metallization rate of the pellets

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图 5 还原时间对球团金属化率的影响

Figure 5. Effect of reduction time on the metallization rate of pellets

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图 6 钛精矿氧化球团

Figure 6. Oxidized pellets of titanium concentrate

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图 7 还原钛精矿球团

Figure 7. Reduced titanium concentrate pellets

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图 8 还原球团XRD

Figure 8. XRD pattern of reduced pellets

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图 9 不同还原时间下还原球团扫描电镜形貌及还原球团局部SEM形貌

Figure 9. SEM of the reduced pellets at different reduction time

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表 1 攀西细粒级钛精矿典型粒度分析

Table 1. Particle size distribution of typical Panxi titanium concentrate

粒径/mm	含量/%
>0.25	0
0.25～0.125	10.21
0.125～0.09	15.08
0.09～0.074	9.57
0.074～0.044	36.6
<0.044	28.54

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表 2 攀西典型钛精矿化学成分

Table 2. Chemical compositions of typical Panxi titanium concentrate　　　　　　　　　　　　　　　%

TiO₂	FeO	Fe₂O₃	SiO₂	S	CaO	MgO	MnO
46.76	34.95	6.55	3.98	0.26	0.95	4.86	0.721

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表 3 氧化球团粒度分布

Table 3. Size distribution of oxidized pellets

粒径/mm	含量/%
<10.5	8
10.5～11.5	21
11.5～12.5	20
12.5～13.5	17
13.5～14.5	14
14.5～15.5	11
>15.5	9

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表 4 氧化球团基本指标

Table 4. Basic indexes of oxidized pellets

w/%				抗压强度/N	转鼓指数/%
TiO₂	TFe	FeO	S	抗压强度/N	转鼓指数/%
43.11～46.15	30.40～32.14	0.51～1.60	0.011～0.019	388～833	51.13～82.13
45.86	31.03	0.56	0.013	665	65.98

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表 5 攀钢焦炉煤气成分(体积分数)

Table 5. Compositions of coke oven gas from Pangang group (volume fraction) %

CO₂	C_nH_m	O₂	CO	H₂	CH₄	N₂
2.1	2	0.3	8.2	63.5	20.6	3.3

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表 6 还原球团扫描电镜能谱分析（质量分数）

Table 6. Chemical compositions of reduced pellets via EDS (mass fraction) %

序号	O	Mg	Al	Si	Ca	Ti	Fe
1^#	1.40					1.32	97.28
2^#	1.19		1.03			4.90	92.88
3^#	54.40	2.69	0.78	3.57	0.89	31.10	5.75

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