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| Effect of alkali chloride on sediment of zinc-bearing flus gas from rotary hearth furnace |
| HE Huan-yu1,2，SONG Ze-yu1,2，HOU Wei-wei1,2 |
（1. The State Key Laboratory of Refractories and Metallurgy， Wuhan University of Science and Technology， Wuhan 430081， Hubei， China
2. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education， Wuhan University of Science and Technology， Wuhan 400081， Hubei， China） |
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Abstract Zinc-bearing metallurgical dust with alkali chloride in different proportions was studied through reductive and deposition experiment to analyze the effect of alkali chloride and its content on the deposition of the zinc-containing flus gas in rotary hearth furnace. The result shows that when the adding ratio of alkali chlorides is 0.5， 1.0 and 1.5 times to the content of the raw material，the sediments concentrate at the enrichment region located at the range of 600-700 ℃， the ratio of the deposition and total mass increases from 30.49% to 53.33% and the deposition percentage of Zinc and alkali chloride which comes from the raw material assembled in this range increases from 20.75% to 30.72%. The alkali chloride precipitated from the flue gas at the melting point promotes the precipitation of zinc-contained solid particles as the core of crystallization. The alkali chloride in the sediment reduces the critical energy of ZnO particle boundary， engender the augment of fusion between the ZnO particles， and the composite alkali chloride-zinc oxide also increases. Sediment structure is thicker and more compact， and the layered structure of different precipitates is more obvious.
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Received: 14 August 2017
Published: 11 May 2018
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2018, Vol. 53 
