短回转窑-立窑型废线路板高温焚烧冶炼炉

针对传统冲天炉或鼓风炉焚烧废线路板有毒害尾气氧化不完全而存在的排放黑烟、排放恶臭性气味等环境污染问题,研发一种由短回转窑和立窑组成的废线路板高温资源化处置炉。短回转窑完成废线路板粉料喷射燃烧和金属熔炼,立窑完成尾气充分氧化。半工业性试验表明,烟气中无苯类化合物成分,二噁英含量0.02 TEQng/m3,烟气林格曼黑度1,炉渣浸出液无毒性,无需额外燃料。证实了废线路板高温焚烧冶炼处置的可行性,高温焚烧能从源头上消除二噁英形成所需的前驱物质,处置炉优化思路是集成高温焚烧、低NOx焚烧、炉渣贫化冶炼和烟气干法急冷等技术。

High-temperature Incineration and Smelting Furnace Composed of Short Rotary Kiln and Shaft Kiln for Waste Printed Circuit Boards

To solve environmental pollution of obvious poisonous black smoke and fetid odor from the incomplete oxidization of toxic flue gas when printed circuit boards (PCBs) are disposed with copula, shaft furnace or blast furnace, a new high-temperature incineration and smelting composite-type furnace of waste PCBs composed by a short rotary kiln and a shaft kiln has been developed. The spray combustion of PCB powder and metal melting is completed in its rotary kiln, the toxic flue gas is oxidized completely in its shaft kiln. Semi-industrial experiments show that there is no benzene compound in flue gas, Tetrachlorodibenzo-p-dioxin (TCDD) is less than 0.02 ng I -TEQ/Nm₃ and Lingeman blackness of flue gas 1; there is no heavy metals pollution in the slag and no extra fuel is needed. The feasibility of high-temperature incineration and smelting process of waste PCBs has been proved, TCDD precursor is eliminated from the source completely under the high-temperature incineration, and the optimization methods of resourcization disposal furnace is the integration of high-temperature combustion, low NO_x combustion, slag reduction smelting and flue gas dry quench.