Sediment of flus gas in direct reduction treated by zinc-bearing metallurgical dust
HE Huan-yu，CHEN Zhen-hong，CUI Yi-fang，WANG Jie-qi
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education， Wuhan University of Science and Technology， Wuhan 430081， Hubei， China
Abstract：The blocking by zinc-bearing flue gas is the key of restraining the treatment of metallurgical dust in rotary hearth furnace. In the current study， the high-temperature tubular furnace was used to mimic the deposition of flus gas sediment produced by the reduction reaction of metallurgical dust， then， the characteristics of depositions including the distribution of quality， the morphology and the main components of depositions were analyzed， the effects of temperature， alkali metal and tail gas atmosphere on the characteristics of flus gas sediment were also studied here. The results showed the deposition started from 950-1 000 ℃， with the maximum amount of deposition reached at 600～750 ℃ and ended under 600 ℃ indicating that the temperature had a significant influence on the characteristics of flus gas sediment. In addition， the lower temperature decreased the size of deposite and increased of the chaos of deposite. The main phase in the enrichment region of dust disposition was composed of ZnO， NaCl， KCl and Zn5(OH)8Cl2H2O， in which the zinc content was 58.50%-65.23%. The state change of the alkali metal chloride in enrichment region promoted the accumulation and reunion of dust particles. Due to the weak oxidation of flue gas， a large amount of metallic zinc appeared in the bag dust.
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HE Huan-yu，CHEN Zhen-hong，CUI Yi-fang，WANG Jie-qi. Sediment of flus gas in direct reduction treated by zinc-bearing metallurgical dust. Iron and Steel, 2015, 50(12): 80-84.
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2015, Vol. 50 
