不锈钢精炼渣在电炉热态利用试验研究

赵海泉

doi:10.7513/j.issn.1004-7638.2021.05.019

不锈钢精炼渣在电炉热态利用试验研究

doi: 10.7513/j.issn.1004-7638.2021.05.019

赵海泉

攀枝花学院，四川攀枝花 617000

基金项目: 国家重点研发计划项目：钢铁流程绿色化关键技术（项目编号：2017YFB0304300）

详细信息

作者简介:
赵海泉（1975—），男，山西文水人，博士，副研究员，从事冶金固废资源化利用工艺研究，E-mail：zhao_hai_quan@163.com。

中图分类号: X757
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- 被引次数: 0
出版历程
- 收稿日期: 2020-07-21
- 刊出日期: 2021-10-30

Test on the hot utilization of stainless steel refining slag in EAF

Zhao Haiquan

Panzhihua University, Panzhihua 617000, Sichuan, China

摘要

摘要: 在不锈钢精炼渣热态利用性质分析基础上，结合电炉为钢水粗炼、电能熔炼特点，开展了热态注余渣在电炉冶炼利用的试验研究。试验研究表明，电炉利用热态注余渣不仅有助于高碱度液渣快速形成，提高脱硫效率，降低石灰消耗3 kg/t，降低轻烧白云石1.2 kg/t，降低萤石消耗1.8 kg/t；而且回收了注余渣余热，吨钢电耗降低5～10 kWh，同时改善了EAF冶炼条件，降低了钢水氧化损耗，降低还原硅铁消耗1.5～2 kg/t，缩短了冶炼时间3～5 min/炉。就钢渣资源利用、节能减排方面，该研究成果对精炼渣利用发展具有借鉴作用。
- 电炉 /
- LF精炼渣 /
- 不锈钢 /
- 注余渣 /
- 余热利用
Abstract: Based on the analysis on hot utilization of stainless steel refining slag, considering the characteristics of electric furnace which it is primary steelmaking process and using electric power, a test on hot pouring residual utilization in electric furnace had been carried out. It is found out that hot pouring residual utilization in electric furnace can not only promote the rapid formation of high basicity slag and improve desulfurization efficiency, but also recycle waste heat and reduce power consumption. After hot utilization, the consumption of lime is reduced by 3 kg/t and lightly burned dolomite by 1.2 kg/t and fluorite by 1.8 kg/t as well, meanwhile electricity consumption is reduced by 5~10 kWh. Electric furnace conditions is improved significantly, where oxidation loss of molten steel is reduced, the consumption of ferrosilicon is reduced by 1.5～2 kg/t and smelting time is shortened by 3～5 minutes per heat. From the aspects of utilization of steel slag, energy conservation and emissions reduction, this research results can be helpful for the development of refining slag utilization.
- electric furnace /
- LF refining slag /
- stainless steel /
- pouring residual /
- utilization of waste heat

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图 1 不锈钢生产工艺及EAF回收热态注余渣试验流程

Figure 1. Flow chart of stainless steel process and EAF recovery hot residual test

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图 2 试验(CaO)有效利用率

Figure 2. The effective utilization of (CaO) in test

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图 3 试验石灰消耗对比

Figure 3. The comparison of lime consumption in test

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图 4 试验轻烧白云石消耗对比

Figure 4. The comparison of light burn consumption in test

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图 5 试验萤石消耗对比

Figure 5. The comparison of fluorite consumption in test

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图 6 试验吨钢电耗

Figure 6. The power consumption per heat in test

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图 7 试验硅铁消耗对比

Figure 7. The comparison of ferrosilicon consumption in test

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图 8 试验冶炼时间对比

Figure 8. The comparison of smelting time in test

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表 1 国内某不锈钢厂LF精炼渣主要成分

Table 1. Main components of a domestic stainless steel factory LF refining slag

w(CaO)/%	w(MgO) /%	w(Al₂O₃) /%	w(SiO₂) /%	w(MnO) /%	w(FeO) /%	R	C_S
60～67	5～8	2～4	15～20	0.2～0.5	0.3～0.5	3～4.5	0.015～0.25

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表 2 EAF回收热态注余渣试验的消耗对比

Table 2. Comparison of consumption in test of recycling hot residual in EAF

试验	用量/(kg·炉⁻¹)				电耗/ (kWh·t⁻¹)	冶炼时间/ (min·炉⁻¹)
试验	石灰	萤石	轻烧	硅铁	电耗/ (kWh·t⁻¹)	冶炼时间/ (min·炉⁻¹)
未回收	6500～7500	450～500	350～400	1800～2000	310～330	50～55
回收	6300～6800	150～200	200～250	1300～1500	280～300	48～52

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