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›› 2003, Vol. 3 ›› Issue (5): 0-0.

• 5 •    

Simulation on the Conductivity of Charging Stock with Percolation Structure in the Submerged Arc Furnace

CHU Shao-jun(储少军)，NIU Qiang(牛强)，LIU Xin-yu(刘新宇)，WANG Xin(王欣)   

  1. 1. School of Metallurgical Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Academic Divisions, Chinese Academy of Sciences, Beijing 100864, China
  • 出版日期:2003-10-20 发布日期:2003-10-20

Simulation on the Conductivity of Charging Stock with Percolation Structure in the Submerged Arc Furnace

CHU Shao-jun,NIU Qiang,LIU Xin-yu,WANG Xin   

  1. 1. State Key Laboratory of Biochemical Engineering, Inst. Proc. Eng., CAS, Beijing 100080, China; 2. College of Chemistry and Biological Sciences, Jiangxi Normal University, Nanchang, Jiangxi 330027, China
  • Online:2003-10-20 Published:2003-10-20

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摘要： Based on the fractal geometry, a new way for selecting material burden ratio and size distribution, named physical design of burden, which is different from stoichiometric weight of carbon burden, would play a more important role in the operation of submerged arc furnace process. Cold simulation investigation was carried out to find how the fraction and size of metal balls affects the specific conductivity of charge mixture, by applying the percolation structure theory. A parameter equation, s/s=A(F-Fc)v, was suggested to calculate the specific conductivity of the charge mixture.

关键词: submerged arc furnace, resistance of charge, percolation structure, fractal geometry

Abstract: Thiobacillus ferrooxidans oxidating ferrous sulphate effectively at low pH (pH<2.0) is prerequisite to the industrial application of two-step bioleaching. In this work, the strain was adapted by sequential adaptive culture and isolation via continuous culture. Compared with the original Thiobacillus ferrooxidans TF5, its optimum pH for oxidating ferrous iron was changed from 2.0~3.0 to 1.7~2.0, and the ratio of oxidized ferrous iron was improved from 13.1% to 85% at pH=1.7. Kinetic research showed that, under the optimized cultural condition of initial pH=1.7, culture temperature near 31oC, 98% of ferrous iron contained in 9K medium was oxidized after cultivation for 52 h in a 250 ml Erlenmeyer flask incubated on a rotary shaker at 120 r/min, and the growth rate of Thiobacillus ferrooxidans cells was 0.0635 h-1, which is similar to the original type. It was showed that the adapted Thiobacillus ferrooxidans is potentially useful in the industrial application of two-step bioleaching.

Key words: submerged arc furnace, resistance of charge, percolation structure, fractal geometry

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