钢铁行业钙基半干法脱硫灰渣资源化利用进展  

Progress in the resource utilization of calcium-based semi-dry desulfurized ash in the iron and steel industry

作　　者：钱大益 王艳 叶凯航 邢奕 苏伟 段淑雅 QIAN Dayi;WANG Yan;YE Kaihang;XING Yi;SU Wei;DUAN Shuya(Key Laboratory of Pollutant Chemistry and Environmental Treatment,School of Chemistry and Environmental Science,Yili Normal University,Yining 835000,China;School of Energy Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]伊犁师范大学化学与环境科学学院污染物化学与环境治理重点实验室,伊宁835000 [2]北京科技大学能源与环境工程学院,北京100083

出　　处：《工程科学学报》2024年第3期567-579,共13页Chinese Journal of Engineering

基　　金：新疆维吾尔自治区自然科学基金资助项目(2022D01C333);伊犁师范大学提升学科综合实力专项(22XKZZ13)。

摘　　要：对首钢和唐钢循环流化床(CFB)、密相塔(DFA)烟气脱硫灰氧化改性进行了深入研究,脱硫灰分的矿物相组成主要包括CaSO_(3)·0.5H_(2)O、CaSO_(4)、CaCO_(3)、Ca(OH)_(2),平均粒径为7.252μm、中位粒径(D_(50))为4.521μm、80%的粒子粒径处于1.039~16.162μm、比表面积为2.25 m^(2)·g^(–1),比表面积相对较大,且喷雾干燥(SDA)法脱硫灰粒径明显大于CFB与DFA法;脱硫灰含水率0.02%~0.36%,体积密度0.85~1.0 t·m^(–3),容积密度0.55~1.0 t·m^(–3),真密度2.25~2.69 t·m^(–3),压实密度为1.4 t·m^(–3);脱硫灰粒大小不一,形状多为不规则的小类球体且孔道直径在0.1~0.2μm.结合半干法脱硫灰理化性质系统表征、改性与工业化应用等成果,系统分析目前钢铁企业及其他半干法脱硫灰资源化利用研究的主要方向和进展情况,提出利用半干法脱硫灰制备多种新型材料实现半干法脱硫灰资源化利用.With the introduction of an ultralow emission policy for the steel industry,nearly 70%of the steel enterprises in China have integrated desulfurization,denitrification,dust removal,and collaborative treatment transformation.The semi-dry desulfurization process,which mostly uses CaO or Ca(OH)_(2) as the desulfurization absorber,has produced large amounts of desulfurization byproducts—desulfurized ash—which is difficult to resource.Relevant data show that China annually produces approximately 20 million tons of semi-dry desulfurized ash,which is the third largest solid waste in China.At present,the treatment of semidry desulfurized ash is mainly based on stockpiling,leading to increased land occupation.Semidry desulfurized ash has the characteristics of slow hydration reaction,strong alkalinity,and high content of metal impurities,and long-term stockpiling also causes environmental pollution;therefore,the resource utilization of semidry desulfurization byproducts has become a hot research and practical issue in the environmental field.This research team conducted in-depth research on the oxidative modification of flue gas desulfurized ash from Shougang and Tanggang circular fluidized bed(CFB)and dense phase tower(DFA).The mineral phase composition of the desulfurized ash mainly includes CaSO_(3)·0.5H_(2)O,CaSO_(4),CaCO_(3),and Ca(OH)_(2),which are slightly different from those of the wet desulfurized ash(the main composition is CaSO_(4)·2H_(2)O).The average particle size of the desulfurized ash is 7.252μm,with a median particle size(D_(50))of 4.521μm,and 80%of the particles are in the range of 1.039–16.162μm.The specific surface area is 2.25 m^(2)·g^(−1),the specific surface area is relatively large,and the particle size of desulfurized ash by the spray drying absorption method is significantly larger than that of the CFB and DFA methods.The main physical characteristics of the desulfurized ash are as follows:water content,0.02%–0.36%;bulk density,0.85–1.0 t·m^(−3);bulk density,0.55–1.0 t·m^

关 键 词：烧结 球团 钙基半干法 脱硫灰渣 资源化利用 

分 类 号：X701.3[环境科学与工程—环境工程]