惰性气氛下电解锰渣高温还原焙烧脱硫

doi:10.16085/j.issn.1000-6613.2021-0271

摘要/Abstract

摘要：

电解锰渣的化学成分与水泥的组成符合，但高含硫量限制了其在水泥生产中的掺量。本研究采用高温还原焙烧法脱除电解锰渣中的硫，以焦炭为还原剂，在氮气气氛中以不同条件对电解锰渣进行热分解生成SO₂。用扫描电镜（SEM）和X射线衍射（XRD）分析固体产物，气体分析仪分析SO₂的释放，高温还原焙烧法脱除电解锰渣中的硫，探究焙烧温度和焦炭添加量对焙烧产物的物相和硫含量的影响。实验结果表明，生成SO₂的最佳条件为焦炭添加量4％、分解温度1000℃。在最佳条件下，SO₂的最大浓度为3513mg/m³，可用于生产硫酸。焙烧固体产物在温度为900℃、焦炭添加量为4%添加时，SO₃含量可以降低到2.17％。根据GB175—2007《通用硅酸盐水泥》中规定，满足水泥中SO₃含量须低于3.5%的要求，电解锰渣还原焙烧产品可以作为水泥原料，为电解锰渣的资源化综合利用提供理论依据和技术参考。

关键词: 电解锰渣, 还原, 环境, 热解, 脱硫, 焦炭

Abstract:

The chemical composition of electrolytic manganese slag is required to have good consistency in the composition of cement, but the high sulfur content limits its mixing in cement production. In this study, coke was used as the reducing agent, and the electrolytic manganese slag was thermally decomposed to generate SO₂ under different conditions in a nitrogen atmosphere. The solid product was analyzed by SEM and XRD. The gas analyzer analyzed the release of SO₂. The high temperature reduction roasting method was used to remove the sulfur in the electrolytic manganese slag. The effect of roasting temperature and coke addition on the phase and sulfur content of the roasted product was explored. Experimental results show that the optimal conditions for generating SO₂ are 4% coke addition and a decomposition temperature of 1000℃. Under the best conditions, the maximum concentration of SO₂ is 3513mg/m³, which can be used to produce sulfuric acid. When the temperature of the calcined solid product is 900℃ and the coke addition is 4%, the SO₃ content can be reduced to 2.17%. According to the provisions of GB175—2007 "General portland cement", the SO₃ content in cement must be less than 3.5%, and the electrolytic manganese slag roasted product can be used as a cement raw material. It proves the feasibility of electrolytic manganese slag as a cement additive, and provides a theoretical basis and technical reference for the comprehensive utilization of electrolytic manganese slag

Key words: electrolytic manganese slag, reduction, environment, pyrolysis, desulfurization, coke

中图分类号:

X705

熊玉路, 徐子豪, 李英杰, 田森林, 宁平. 惰性气氛下电解锰渣高温还原焙烧脱硫[J]. 化工进展, 2021, 40(S1): 319-325.

XIONG Yulu, XU Zihao, LI Yingjie, TIAN Senlin, NING Ping. Removal of sulfur from electrolytic manganese slag by high-temperature reduction roasting in an inert atmosphere[J]. Chemical Industry and Engineering Progress, 2021, 40(S1): 319-325.

图/表 12

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化学组成	质量分数/%	化学组成	质量分数/%
SrO	0.066	Fe₂O₃	2.135
Na₂O	0.833	MgO	1.526
Al₂O₃	6.788	SiO₂	25.858
P₂O₅	0.372	SO₃	16.742
K₂O	1.278	CaO	18.888
TiO₂	0.504	MnO	2.940
CuO	0.019	NiO	0.059
PbO	1.010	ZnO	0.027

化学组成	质量分数/%	化学组成	质量分数/%
SrO	0.066	Fe₂O₃	2.135
Na₂O	0.833	MgO	1.526
Al₂O₃	6.788	SiO₂	25.858
P₂O₅	0.372	SO₃	16.742
K₂O	1.278	CaO	18.888
TiO₂	0.504	MnO	2.940
CuO	0.019	NiO	0.059
PbO	1.010	ZnO	0.027

温度区间/℃	质量损失率/%
0~167	2.63
167~400	0.63
400~500	0.1
500~630	0.4
630~900	1.4

温度区间/℃	质量损失率/%
0~167	2.63
167~400	0.63
400~500	0.1
500~630	0.4
630~900	1.4

添加焦炭质量分数/%	SO₃质量分数/%
添加焦炭质量分数/%	700℃	800℃	900℃	1000℃	1100℃
0	21.25	18.81	13.69	7.81	0
2	18.59	16.35	6.46	0.97	0
4	18.43	15.03	2.17	0	0
6	17.85	14.40	0	0	0
8	16.23	13.78	0	0	0