钢渣改性用于烟气脱硫研究进展

doi:10.19964/j.issn.1006-4990.2021-0778

Abstract

Abstract:

Steel slag has the structural characteristics of loose and porous，and rich in alkaline oxides such as CaO and MgO，so it is highly alkaline in the solution and has strong acid neutralization ability，which can effectively remove sulfur dioxide from flue gas and realize effective desulfurization.At present，steel slag-based desulfurization absorption materials are mainly used in wet desulfurization processes.The basic mechanism is the mass transfer between the gas phase and the liquid phase，which contains three steps：1）SO₂ enters the liquid phase from the gas phase；2）the alkaline substance is dissolved out of steel slag，and 3）chemical reaction occurs between SO₂and alkaline substances in the liquid phase.However，the overall desulfurization efficiency is mainly affected by the first two steps.The main factors include inlet SO₂ mass concentration，liquid-gas ratio，slurry pH，reaction temperature，steel slag particle size and so on.However，at present，the research on the influence mechanism of other components in steel slag except CaO and MgO on the desulfurization effect is not enough.Therefore，it is necessary to actively explore the synergistic mechanism of different chemical components in steel slag in the desulfurization absorption process，consolidate the theoretical basis of steel slag for flue gas desulfurization and then realize the industrial application of steel slag desulfurization.

Key words: steel slag, modification, gasdesulfurization, mechanism

CLC Number:

X701.3

DU Xiaoyan,LONG Hongming,LIU Xiuyu,ZHU Qingming,HAN Weisheng. Research progress on flue gas desulfurization by modification of steel slag[J]. Inorganic Chemicals Industry, 2022, 54(11): 39-44.

Figures/Tables 3

Table 1

Research on desulfurization of modified steel slag"

改性方式	改性途径	组分，质量分数/%	反应器	反应条件	脱硫率/%
物理改性	粉磨至75 μm	CaO：45~50；MgO：4~5；Fe₂O₃：7~10；FeO：10~18；SiO₂：10~11；MnO：0.5~2.5；Al₂O₃： 1~4；P₂O₅：3~5；f-CaO：5~11	填料塔	pH＝8~11；液气比为10~24 L/m³；浆液质量分数为4％	60^[11]
	粒度＜45 μm	CaO：38.02；MgO：7.62；FeO：9.3；SiO₂：12.47；Fe：15.92；MnO：2.63；Al₂O₃：6.99	吸收塔	烟气流量为34.84万m³/h；入口SO₂质量浓度为7 089.85 mg/m³	98.16^[8]
	粒度＜75 μm	CaO：59.16；MgO：3.22；Fe₂O₃：10.75；SiO₂：12.79；SO₃：0.77；MnO：3.22；Al₂O₃：5.89；其他：6.85	鼓泡反应器	反应温度为30 ℃、浆液质量分数为8%；烟气流量为400 mL/min	95^[12]
	比表面积=400 m²/kg	CaO：52.35；MgO：10.85；Fe：4.91；S：0.294	循环硫化床	入口SO₂质量浓度为900 mg/m³；钢渣加入量为1 300 kg/h；喷水流量为360 L/min	72^[13]
	粉磨至75 μm	CaO：＞45	再生池	钢渣加入量为40 g；入口SO₂质量浓度为 2 400 mg/m³；烟气流量为0.05 m³/h；pH=7~8	80^[14]
化学改性	碱式碳酸镁与钢渣按10∶1质量比混合	CaO：46.83；MgO：7.61；Fe₂O₃：1.24；SiO₂： 32.28；MnO：1.00；Al₂O₃：8.73	鼓泡反应装置	反应温度为100 ℃；搅拌速率为300 r/min；质量比为10∶1；粒径≥0.074 mm；反应时间＜150 min	80^[6]
	粒径为75 μm钢渣与2 mmol/L 柠檬酸反应2 h	CaO：43.25；Fe₂O₃：14.99；SiO₂：22.85；Al₂O₃：6.32；MnO：2.87； MgO：4.26；P₂O₅：1.9	鼓泡反应器	钢渣浆液质量分数为4%；入口SO₂质量浓度为1 500 mg/m³	90^[15]
	粒径为75 μm钢渣与质量分数为27%H₂SO₄混合，调节至浆液pH为5.5~6.0	CaO：41.38；MgO：6.5；Fe₂O₃：17.67；SiO₂： 17.62；SO₃：1.17；MnO：1.13；Al₂O₃：8.16； MnO：1.13	鼓泡搅拌装置	反应温度为40 ℃；浆液pH=5.5；氧化度OR=0.8	100^[16]
	10 μm钢渣与活性炭按质量比1∶2混合，以400 r/min 速率在行星式球磨机中机械搅拌1 h	SiO₂：44.90；CaO：21.16；Al₂O₃：15.76； Fe₂O₃：11.10；MgO：2.41	固定床反应器	入口SO₂体积分数为0.06%；气体流量为 600 mL/min；吸附剂质量为6 g；体积空速为 3 600 h^-1；反应温度为120 ℃	79^[17]
	75 μm钢渣与水菱镁按质量比 10∶1混合，在300 r/min速率下搅拌一定时间	—	鼓泡器	入口SO₂质量浓度为2 000 mg/m³；浆液pH= 5；浆液浓度为0.5 mol/L；烟气流量为 50 mL/min；反应温度为60 ℃；搅拌速率为 100 r/min；鼓泡深度为2.5 cm	98.55^[18]

Table 1

Fig.1

Table 2

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成分	w（CaO）	w（Al₂O₃）	w（MgO）	w（SiO₂）	w（SO₃）
脱硫前钢渣	43.25	6.32	4.26	22.85	0.37
脱硫后钢渣	40.23	5.99	4.21	20.73	6.13

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Research progress on flue gas desulfurization by modification of steel slag

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