含锌电炉粉尘钙化碳热还原焙烧实验

余水; 邱家用; 居殿春; 朱开琦; 陶雨倩; 毛瑞

doi:10.3969/j.issn.1000-6532.2024.03.021

含锌电炉粉尘钙化碳热还原焙烧实验

1.
江苏科技大学冶金与材料工程学院，江苏　苏州　215600

2.
江苏沙钢钢铁研究院炼铁环境研究室，江苏　苏州　215625

基金项目: “十三五”国家重点研发计划基金资助项目（2017YFB0603801）；江苏省自然科学基金资助项目（BK20161271）；江苏科技大学本科创新创业训练计划项目

详细信息

作者简介: 余水（1995-），男，硕士，主要研究方向为冶金固体废弃物资源化综合利用研究

通讯作者: 邱家用（1975-），男，博士，副教授, 主要研究方向为冶金固体废弃物资源化综合利用研究、冶金数值模拟与仿真

中图分类号: TD982;TF82

收稿日期: 2022-07-18

刊出日期: 2024-06-25

Experiment on Calcified Carbothermal Reduction Roasting of Zinc Containing Electric Furnace Dust

1.
School of Metallurgical and Materials Engineering, Jiangsu University of Science and Technology, Suzhou 215600, Jiangsu, China

2.
Laboratory of Iron Making Environment, Institute of Research of Iron and Steel, Jiangsu Sha-steel, Suzhou 215600, Jiangsu, China

More Information

Corresponding author: QIU Jiayong, qiujiayong0902@163.com

Received Date: 18 July 2022

Publish Date: 25 June 2024

摘要

摘要:
这是一篇冶金工程领域的论文。为强化含锌电炉粉尘中锌和铁资源的有效分离与回收，并降低碳还原剂消耗，提出以电炉粉尘制备高碱度炉料进行钙化碳热还原焙烧的思路和方法。采用热力学计算和实验研究相结合，分析电炉粉尘钙化碳热还原焙烧过程中主要物相转变规律，探究其钙化碳热还原反应行为和路径。结果表明，当碳氧摩尔比n_c/n_o＜0.6和温度低于1000 ℃时，ZnFe₂O₄还原生成Fe_0.85-xZn_xO，抑制锌的还原和挥发。而添加CaO均能将ZnFe₂O₄和Fe_0.85-xZn_xO钙化生成Ca₂Fe₂O₅，Ca₂Fe₂O₅会被进一步还原。当温度低于1100 ℃及n_c/n_o＜1.0时，含锌电炉粉尘钙化碳热还原焙烧反应路径为：ZnFe₂O₄ + CaO → Ca₂Fe₂O₅ + ZnO → Ca₂Fe₂O₅+ Zn (g) 和Fe_0.85-xZn_xO + CaO → Ca₂Fe₂O₅ + ZnO + FeO →Ca₂Fe₂O₅ + Fe + Zn (g)。这两种反应均能促进锌的释放。在n_c/n_o为0.4～1.2，焙烧温度为1000～1100 ℃，CaO能促进锌的挥发，钙化碳热还原焙烧n_c/n_o=1.0时的脱锌率与碳热还原焙烧n_c/n_o=1.2时接近，均在90%左右。因此，钙化碳热还原焙烧可降低碳还原剂消耗，节约能耗。
- 冶金工程 /
- 电炉粉尘 /
- 钙化碳热还原焙烧 /
- 物相转变 /
- 脱锌率 /
- 资源化利用
Abstract:
This is an article in the field of metallurgical engineering. In order to strengthen the effective separation and recovery of zinc and iron resources in zinc containing electric arc furnace dust(EAFD), and reduce the consumption of carbon reducing agent, the idea and method of calcified carbothermal reduction roasting with high basicity burden prepared from EAFD was proposed. Thermodynamic calculation and test study were combined, the main phase transformation during the calcified carbothermal reduction roasting process of EAFD was analyzed to explore calcified carbothermal reduction reaction behavior and path. It is shown that the reduction of ZnFe₂O₄ to Fe_0.85-xZn_xO inhibits the reduction and volatilization of zinc when the molar ratio of carbon to oxygen is less than 0.6 and the temperature is lower than 1000 ℃. While the calcification of ZnFe₂O₄ and Fe_0.85-xZn_xO to Ca₂Fe₂O₅ by adding CaO can promote the reduction of zinc and Ca₂Fe₂O₅ will be further reduced. When the temperature is lower than 1100 ℃ and n_c/n_o< 1.0, the reaction path of calcified carbothermal reduction roasting is ZnFe₂O₄ + CaO → Ca₂Fe₂O₅ + ZnO → Ca₂Fe₂O₅ + Zn (g) and Fe_0.85-xZn_xO + CaO → Ca₂Fe₂O₅ + ZnO + FeO → Ca₂Fe₂O₅ + Fe + Zn (g). Both of these reactions can promote the release of zinc. The results show that CaO can promote zinc volatilization in the range of n_c/n_o 0.4～1.2 and calcination temperature 1000～1100 ℃. The dezincification rate of calcified carbon thermal reduction roasting at n_c/n_o = 1.0 is close to that at n_c/n_o = 1.2, both of which are about 90%, so the consumption of carbon reducing agent can be reduced and energy consumption can be saved.
- Metallurgical engineering /
- EAFD /
- Calcified carbothermal reduction roasting /
- Phase transformation /
- Zinc volatilization degree /
- Resource utilization

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图 1 电炉粉尘原料的XRD

Figure 1.

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图 2 电炉粉尘原料的SEM

Figure 2.

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图 3 粒度分布

Figure 3.

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图 4 电炉粉尘钙化碳热还原反应的△G^θ与温度变化的关系

Figure 4.

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图 5 不同碳氧摩尔比试样焙烧后的XRD

Figure 5.

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图 6 不同焙烧温度下试样焙烧后的XRD

Figure 6.

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图 7 碳氧比对脱锌率的影响(T=1000 ℃)

Figure 7.

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图 8 焙烧温度对脱锌率的影响(n_c/n_o=0.8)

Figure 8.

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表 1 沙钢含锌电炉粉尘化学成分/%

Table 1. Chemical composition of zinc-bearing EAFD in Sha-steel

TFe	Zn	CaO	C	SiO₂	MgO	MnO	K₂O	SO₃
74.62	12.96	3.11	2.86	2.01	1.18	1.35	0.75	0.63

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表 2 电炉粉尘钙化碳热还原焙烧主要化学反应

Table 2. Main chemical reaction of calcified carbothermal reduction roasting of EAFD

化学反应	起始温度/K
3ZnFe₂O₄+C= 3ZnO+2Fe₃O₄+CO(g)	663
ZnFe₂O₄+C= ZnO+2FeO+CO(g)	754
ZnFe₂O₄+4C= Zn+2Fe+4CO(g)	1020
ZnFe₂O₄+2CaO= Ca₂Fe₂O₅+ ZnO	自发进行
ZnFe₂O₄+ 2CaO+C= Zn+Ca₂Fe₂O₅+CO(g)	1040
3Fe₂O₃+C=2Fe₃O₄+CO(g)	597
Fe₃O₄+C=3FeO+CO(g)	937
FeO+C=Fe+CO(g)	978
ZnO+C=Zn(g)+CO(g)	1225
Ca₂Fe₂O₅+3C= 2CaO+2Fe+3CO(g)	1047

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