造纸污泥焚烧飞灰危险特性及影响因素

Dangerous Characteristics and Influencing Factors of Fly Ash from Papermaking Sludge Incineration

关键词:  造纸污泥  焚烧  飞灰  危险特性

Key Words:papermaking sludge  incineration  fly ash  hazardous characteristics

摘要:以国内某废纸造纸企业的污泥焚烧飞灰为研究对象，采集100个样品进行元素含量和危险特性测试，并结合飞灰的产生过程分析其危险特性的影响因素。结果表明，飞灰的pH值10.5～12.2，浸出液中钡浓度最大占标率96%，其他无机元素及化合物浓度最大占标率均低于20%；二英毒性当量质量分数较稳定，且70%的样品测试结果为0.029~0.086 μgTEQ/kg。烟气治理过程中发生氨逃逸现象和氢氧化钙过量时会造成飞灰pH值升高，飞灰浸出液中钡浓度和二英含量均与烟气治理过程中投入的氢氧化钙浓度有关。

Abstract:The sludge incineration fly ash of a domestic waste paper and papermaking enterprise was selected as the research object， and 100 samples were collected to be tested for element content and hazardous characteristics. Combined with the generation process， the influencing factors of dangerous characteristics of fly ash were analyzed. The results showed that the pH value of fly ash was in the range of 10.5~12.2， the maximum concentration of Ba in the leaching solution was 96%， and the maximum concentration of other inorganic elements and compounds was less than 20%. The toxic equivalent mass fraction of dioxins was relatively stable， and it of 70% samples was in the range of 0.029~0.086 μgTEQ/kg. When ammonia escaped and calcium hydroxide was excessive in the flue gas treatment process， the pH value of the fly ash would increase. Both the Ba concentration and the dioxin content in the fly ash leaching solution were related to the calcium hydroxide concentration in the flue gas treatment process.