High Carbon Ferro-Chromium by Self-Reducing Process
This paper discusses the effects of temperature, addition of ferro-silicon and fluxing agents for the production of high carbon ferro-chromium by self-reducing process. The use of self-reducing agglomerates for ferro-alloys production is becoming an emerging processing technology due to lowering the electric energy consumption and improving the metal recovery in comparison with traditional ones. The self-reducing pellets were composed by chromite, petroleum coke, cement and small (0.1% –2%) addition of ferro-silicon. The slag composition was adjusted by addition of fluxing agents. The reduction of pellets was carried out at 1773K (1500℃), 1823K (1550℃) and 1873K (1600℃) by using induction furnace. The products obtained, containing slag and metallic phases, were analyzed by scanning electron microscopy and chemical analyses (XEDS). By increasing temperature from 1773K to 1823K large effect on the reduction time was observed. It decreased from 30 minutes to 10 minutes, for reaching around 0.98 reduction fraction. No significant effect on reduction time was observed when the reduction temperature was increased from 1823K to 1873K. At 1773K, the addition of 2% of ferro-silicon in the pellet resulted in an increasing reaction rate of around 6 times, in comparison with agglomerate without this addition. The addition of fluxing agents (silica and hydrated lime) has effect on reduction time (inverse relationship) and the pellets become less porous after reduction.
ferro-chromium self-reducing composite agglomerate
Zambrano Adolfo Pillihuaman Takano Cyro Mourao Marcelo Breda Tagusagawa Solon Yasuhiko
Metallurgical and Materials Engineering Department of the Escola Politecnica University of Sao Paulo Av.Prof. Mello Moraes, 2463 05508-900 Sao Paulo, Brazil
国际会议
The 5th International Congress on the Science and Technology of Ironmaking(第五届国际炼铁科技大会 ICSTI09)
上海
英文
1347-1351
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）