摘要
在中国某火电厂进行旋风炉附烧解毒不锈钢渣与熔渣调质制备矿渣棉的试验研究,将预混合煤粉和不锈钢渣混合后吹入旋风炉,煤粉燃烧产生的煤灰与不锈钢渣形成液态熔渣,在高速旋转气流的作用下附着在旋风筒内壁上,通过排渣口下部的活动溜槽流入渣罐中,运输至电炉车间倒入电炉中调质,使用四辊离心机制备矿渣棉,系统研究了不锈钢渣解毒机制、电炉调质、离心成纤和矿渣棉性能。研究表明,不锈钢渣中的Cr(VI)在高温和还原气氛下在旋风炉内热解或还原为Cr(III),转化率超过99.96%;添加质量分数为40%不锈钢渣和0%石灰时,熔渣适宜成纤的温度范围为1360~1540℃,制备了酸度系数2.0、平均直径5.1μm、渣球质量分数5.2%的矿渣棉,Cr(VI)和TCr满足国标要求;矿渣棉性能指标达到岩棉水平,燃烧性能为A级不燃。
Detoxification of stainless steel slag in cyclone furnace and preparation of slag wool by modified melt were investigated in a thermal power plant in China.Pulverized coal and stainless steel slag were premixed and then synchronously blown into cyclone furnace.Molten slag formed by coal ash and stainless steel slag were attached to inner wall of cyclone due to high-speed swirling airflow and then flowed into slag tank through movable chute at the bottom of tapping hole.Slag tank was transported to electric furnace workshop and molten slag were poured into electric furnace for modification.Slag wool were prepared by centrifugal machine with modified slag.Detoxification mechanism of stainless steel slag,modification of molten slag,fiberization of modified slag,and properties of slag wool were systematic studied.Research results indicated that Cr(VI)in stainless steel slag were pyrolyzed or reduced to Cr(III)with over 99.96%conversion rate under high temperature and reducing atmosphere.Optimal temperature range of fiberization was 1360-1540℃with 40 mass%stainless steel slag and 0 mass%lime as modification agent.Slag wool with acidity coefficient of 2.0,average diameter of 5.1μm and shot content of 5.2 mass%were prepared.Leaching test indicated that Cr(VI)and TCr inside slag wool met Chinese national standard.Properties and combustion performance of slag wool were equivalent to rock wool and Class A non combustion material,respectively.
作者
李东
林则全
赵贵州
LI Dong;LIN Zequan;ZHAO Guizhou(Iron and Steel Design and Research Institute,MCC Huatian Engineering and Technology Corporation,Ma′anshan 243000,Anhui,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2024年第2期265-274,共10页
Journal of Iron and Steel Research
关键词
旋风炉
不锈钢渣
解毒
调质
矿渣棉
cyclone furnace
stainless steel slag
detoxification
modification
slag wool
