Experimental study on simultaneous desulfurization and denitrification of red mud at low temperature

doi:10.11949/0438-1157.20240342

Abstract

Abstract:

A fixed-bed reactor was used to study the simultaneous desulfurization and denitrification of red mud at 110℃, as well as the effects of water vapor concentration and SO₂ to NO ratio. The physical properties and chemical composition of red mud were measured by BET (Brunauer Emmet Teller) surface area and porosity analyzer, pH meter, laser particle size analyzer (LDSA) and ICP (inductivity coupled plasma mass spectrometry). The experimental results showed that the denitrification efficiency of red mud was 2.4 times that of Ca(OH)₂. The effect of NO content in the reaction gas on the removal of SO₂ was less than 15%. When the SO₂ to NO ratio approached 5, the removal efficiency of NO nearly approached 100%. The optimal range for the effect of water vapor was around 10%. When the water vapor concentration was too high, the conversion and removal of NO can be affected in the early stage, while the desulfurization and denitrification in the later stage were promoted. The effective components for desulfurization and denitrification in red mud mainly included alkaline components and metal oxides.

Key words: waste treatment, absorption, fixed-bed, simultaneous desulfurization and denitrification, red mud, gas-solid reaction

摘要：

采用固定床反应器研究了赤泥在110℃条件下的同时脱硫脱硝反应性能，以及水蒸气浓度和硫硝比对其的影响。采用氮气吸附仪、pH计、电导率计、激光粒度分析仪和电感耦合等离子体质谱仪等分析手段测试了赤泥的物理性质和化学组成。实验结果表明，赤泥的脱硝效率是Ca(OH)₂的2.4倍；反应气体中NO含量对SO₂的脱除影响只有不到15%，而硫硝比接近5时，NO的脱除率接近100%；水蒸气的影响存在10%附近的最佳范围，浓度过高会影响前期NO的转化及脱除，但有利于后期的脱硫脱硝效果。赤泥中脱硫脱硝的有效组分包括碱性成分和金属氧化物。

关键词: 废物处理, 吸收, 固定床, 同时脱硫脱硝, 赤泥, 气固反应

CLC Number:

X 758

Angran ZHAO, Yongqiang HAN, Zhipeng WANG, Pengfei LI, Yawei XU, Huiling TONG. Experimental study on simultaneous desulfurization and denitrification of red mud at low temperature[J]. CIESC Journal, 2024, 75(S1): 276-282.

赵昂然, 韩永强, 王志鹏, 李鹏飞, 许亚伟, 佟会玲. 常温条件下赤泥同时脱硫脱硝实验研究[J]. 化工学报, 2024, 75(S1): 276-282.

Figures/Tables 8

Fig.1 Experimental system of fixed-bed reactor

Table 1 The composition of red mud by ICP

元素	质量分数/%
Al	1.705
Ca	19.58
Fe	7.642
K	0.139
Mg	0.5679
Na	0.8436
Ti	2.299

Table 2 Physical properties of red mud

参数	数值
pH	11.19
电导率/(μS/cm)	1279
TDS/(mg/L)	639.2
比表面积/(m²/g)	24.386
平均孔容/(cm³/g)	0.1077
平均孔径/Å	176.59
平均粒径/μm	15.885

Table 3 Physical properties of Ca（OH）2 and quartz sand［23］

物质	平均粒径/μm	比表面积/(m²/g)
石英砂	360	—
Ca(OH)₂	3.2	6.5

Fig.2 Comparison of simultaneous desulfurization and denitrification capabilities between red mud and Ca(OH)2

Fig.3 The effect of different concentrations of water vapor on the desulfurization and denitrification efficiency of red mud

Fig.4 The effect of SO2/NO on the desulfurization and denitrification efficiency of red mud

Fig.5 Al2O3 simultaneous desulfurization and denitrification outlet gas concentration

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