Grate-Rotary Kiln Pellet Technology of Chromite Concentrate and Study on Mass Balance Calculation

Abstract:

The grate-rotary kiln pellet process of chromite concentrate, which is not only complying with the chrome ore agglomeration process, but also meeting the development of grate-rotary kiln pelletizing technology, and is an effective mearsure of increasing use of high-carbon ferrochrome as well. In this work, aiming at study on grate-rotary kiln pellets of 0.3Mtpa chromite concentrate’s mass balance calculations, the results show when the material is in the specific surface area of 1700cm2/g, the compressive strength of 11 N per pellet, drop number of 5 times from 0.5m height and cracking temperature of 435°C are achieved, especially cracking temperature is higher than the highest temperature of grate DDD 400°C. Measuring and calculation of dehydration loss, ash content and bulk material loss, as well as reduction loss and oxidation loss of coke powder of the green pellet are achieved. The reduction degrees of FeO and Cr2O3 are 68.06% and 52.24% respectively, and comprehensive reduction degree is 58.52%. In this research, the mass balance table of payments of the grate-rotary kiln system is listed, and a detailed mass balance diagram is also obtained.

• Periodical: Advanced Materials Research (Volumes 634-638)
• Pages: 3355-3362
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.634-638.3355
• Online since: January 2013
• Authors: Dai Jun Wang, Sheng Li Wu
• Keywords: Chromite Concentrate, Grate-Rotary Kiln, Mass Balance Calculation, Reduction Degree

References

[1] Lai Zhixian. Investigation of chrome ore electric smelting performance [J]. Ferro –Alloys, 2002, (3): 4-9.

[2] Yang Shiming. The problem and the idea of ferrochrome production development[J]. Ferro -Alloys, 1996, (3): 48-51.

[3] Chen Jin, Wang Shebin, Lin Wanming etal. 21 Century the status quo and the development of chromium resource[J]. Ferro -Alloys, 2005, (2): 38-41.

[4] Hu Linbiao. The effect of characteristics of chrome ore for high carbon ferrochrome smelting[J]. Ferro -Alloys, 2006, (5): 8-17.

[5] Jia Yan-hua, Liu Pei-xiao, Wang Xing-ri etal. Application of cold pressing pellet technology to high carbon ferro-chrome production[J]. Ferro-Alloys, 2011, (2): 7.

[6] Zhou Jinhua. Ferroalloy production technology[M]. Beijing, Science Press, (1991).

[7] Li Zhi-zhong. New technology of chrome ore pre-reduction[J]. Ferro -Alloys, 2011，(6)：8.

[8] Zhu Fei. Balance check and analysis of Chain grate-rotary kiln-ring cold machine system[J]. Industrial Furnace, 2011, 33(4): 34.