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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 6    December 2005

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Reduction mechanism of stainless steelmaking dust and carbon pellets
PENG Bing(彭 兵), SONG Hai-chen(宋海琛), CHAI Li-yuan(柴立元), 
WANG Ja(王 佳), WANG Yun-yan(王云燕), 
MIN Xiao-bo(闵小波), HE De-wen(何德文) 

School of Metallurgical Science and Engineering, Central South University, 
Changsha 410083, China

Abstract: The reduction mechanism of stainless steelmaking dust and carbon pellets was investigated. The metal oxides present in the dust were reduced by carbon with a new direct reduction technology. The direct reduction parameters were determined by measuring the rates of dust melting and reduction. The results show that the rate of reduction is faster than that of the melting. Both melting and reduction processes are accelerated by the direct transfer of heat from the smelting slag. The recovery of metals is improved while the pellets were added to argon oxygen decarburization(AOD) or vacuum oxygen decarburization(VOD) vessels in the late period of the first smelting stage. More carbon travels to the slag instead of to the steel because the diffusion coefficient of carbon, impacted by the viscosity of slag and surface tension between slag and melted steel, is larger in the slag than in the steel. The viscosity of slag is about 2.54Pa•s and the surface tension between slag and steel is about 490mN/m.

 

Key words:  stainless steelmaking dust; direct recycling; diffusion; reduction

ISSN 1672-7029
CN 43-1423/U

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