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含锌烟气沉积堵塞是制约转底炉处理冶金尘泥生产的关键所在。采用高温管式炉模拟冶金尘泥球团还原产生的含锌烟气沉积试验,对沉积物的质量分布、形貌及主要组分等沉积特性进行分析,研究了温度、碱金属及烟气气氛对烟气沉积的影响。研究结果表明,温度对烟气沉积特性影响显著,烟气沉积过程从950~1 000℃开始,在600~750℃达到最大沉积量,温度低于600℃后沉积逐渐结束,并且沉积物晶粒尺寸随温度降低逐渐减小,析出物混乱度逐渐增大;沉积富集区域烟尘锌质量分数为58.50%~65.23%,沉积物主要物相为Zn O、Na Cl、KCl和Zn5(OH)8Cl2H2O,碱金属氯化物在沉积富集区的物态变化促进了烟尘颗粒的相互聚集、团聚;烟气的氧化性不足,使布袋除尘灰中还存在大量单质锌。
Zinc flue gas deposition blockage is the key to control the rotary hearth furnace metallurgical sludge production. The deposition experiment of zinc-containing flue gas produced by reduction of pellets of metallurgical dust with high-temperature tubular furnace was simulated. The sediment mass distribution, morphology and deposition characteristics of the main components were analyzed. The effects of temperature, alkali metal and flue gas atmosphere Impact on flue gas deposition. The results show that the temperature has a significant influence on the deposition characteristics of flue gas. The flue gas deposition process begins at 950-1000 ℃ and reaches the maximum at 600-750 ℃. When the temperature is lower than 600 ℃, the deposition is gradually terminated, The size decreases with the decrease of temperature, and the degree of precipitate confusion increases. The mass fraction of zinc and soot in sedimentary enrichment zone is 58.50% -65.23%, and the main phases of sediment are Zn O, Na Cl, KCl and Zn5 (OH) 8Cl2H2O Alkali metal chloride in the sedimentary enrichment zone of the state changes to promote the soot particles mutual aggregation, reunion; flue gas oxidation is not enough, so that there are a large number of bag element in the ash dust elemental zinc.