碱度对石钢烧结矿矿相结构及冶金性能的影响

刘丽娜

doi:10.7513/j.issn.1004-7638.2021.03.019

碱度对石钢烧结矿矿相结构及冶金性能的影响

doi: 10.7513/j.issn.1004-7638.2021.03.019

刘丽娜^{1, 2,}

1.
华北理工大学矿业工程学院，河北唐山 063009
2.
河北省矿业开发与安全技术实验室，河北唐山 063009

基金项目: 国家自然科学基金资助项目（U1360106，51574105）

详细信息

作者简介:
刘丽娜（1978—），女，河北博野人，副教授，博士生，主要从事工艺矿物学研究，E-mail：43116039@qq.com

中图分类号: TF046
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出版历程
- 刊出日期: 2021-06-10

Influence of basicity on mineralogical microstructure and metallurgical property of sinter in shijiazhuang iron & steel

Liu Lina^{1, 2
,}

1.
College of Mining Engineering, North China University of Science and Technology,Tangshan 063009,Hebei,China
2.
Mining Development and Sbafety Technology Key Lab of Heibei Province,Tangshan 063009,Hebei,China

摘要

摘要: 采用偏光显微镜研究了石钢不同碱度烧结矿的矿物组成及显微结构特征，烧结矿矿相结构与冶金性能之间的关系。研究发现：随着碱度的升高，烧结矿矿物组成简单化，粘结相含量升高，其中铁酸钙含量增加明显；显微结构均匀化，由斑状-粒状结构过渡为交织熔蚀结构，气孔率升高，出现骸晶状及菱形定向排列的赤铁矿，铁酸钙由他形晶形态过渡为针状形态。相应的烧结矿强度、还原性能及低温还原粉化性能有所改善。
- 烧结矿 /
- 碱度 /
- 矿物组成 /
- 显微结构 /
- 冶金性能
Abstract: The mineralogical compositions and microstructure of sinter with different basicity had been investigated by means of polarization microscope, and the relationship between the mineralogical microstructure and the metallurgical property of sinter had been analyzed. The result shows that when the basicity of the sinter varies from 1.8 to 2.4, the mineral composition of sinter is simple, and the content of the binder phase increases. With the basicity of sinter increased, the microstructure of the sinter is uniform gradually and changes from porphyric-granular texture to erosion interleaving texture, the content of the pore is elevated, the skeleton crystals hematite appear, the form of calcium ferrite is anhedron to neddle-shaped. Consequently the metallurgical property of the sinter is improved.
- sinter /
- basicity /
- mineral composition /
- microstructure /
- metallurgical

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图 1 烧结矿冶金性能

Figure 1. Metallurgical property of sinter

下载: 全尺寸图片幻灯片

图 2 不同碱度烧结矿显微结构照片

Figure 2. Microstructure of sinters with different basicity

下载: 全尺寸图片幻灯片

表 1 原料化学成分

Table 1. Chemical compositions of raw materials %

原料	TFe	FeO	SiO₂	CaO	MgO	Al₂O₃	S	P	烧损
精矿1	64.23	27.95	4.6	0.82	1.11	0.81	0.306	0.016	1.14
精矿2	62.42	25.2	4.77	0.9	4.28	0.48	0.305	0.001	25.2
麦克矿	61.74	1.2	3.05	0.02	0.14	1.74	0.047	0.055	6.2
杨迪矿	57.87	0.5	4.96	0.05	0.13	1.35	0.027	0.035	10.06
澳矿	62.3	0.45	5.01	0.25	4.4	1.92	0.037	0.068	3.02
巴西矿	65.85	0.5	2.37	0.02	0.14	0.98	0.02	0.026	1.87
白灰			6.22	71.9	1.55				12.2
高镁粉			7.51	1.85	80.9				7.05
煤粉灰分			35.5	5.71	0.42	20.5

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表 2 烧结矿配矿方案

Table 2. Mixture of sinter kg

样号	精矿1	精矿2	麦克矿	杨迪矿	澳矿	巴西矿	白灰	高镁粉	煤粉灰分	返矿
R1.8	4.62	1.00	1.01	6.56	2.02	5.02	2.65	0.32	1.25	5.55
R2.1	4.51	0.98	0.99	6.40	1.97	4.90	3.14	0.32	1.25	5.56
R2.4	4.40	0.95	0.97	6.24	1.92	4.78	3.64	0.31	1.25	5.56

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表 3 烧结矿矿物组成及体积百分含量

Table 3. Mineral compositions and their volume fraction of sinter %

样号	金属相			粘结相
样号	磁铁矿	赤铁矿	富氏体	铁酸钙	硅酸二钙	钙镁橄榄石	钙铁橄榄石	玻璃质	黄长石	硅灰石
R_1.8	40～45	25～30	1～2	10～12	12～15	2～3	少量	3～5	少量	少量
R_2.4	25～30	30～35		25～30	10～12	少量		1～2

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表 4 烧结矿中主要矿物的抗压强度及还原度^[7]

Table 4. Compressive strength and reducibility of main minerals in sinter

矿物名称	瞬时抗压强度/(kg·mm⁻²)	还原度/%
赤铁矿	26.7	49.9
磁铁矿	36.9	26.7
玻璃质	4.6	3.1
铁酸一钙	37.0	40.1
铁酸二钙	14.2	28.5

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