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Studying Parameters Affecting the Quality of Sponge Iron Produced by Hoganas Process

Asadi Karam, Amir | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47502 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Halali, Mohammad
  7. Abstract:
  8. Hoganas is a gas based process which is more than a hundred years old. In this research, studying parameters affecting the quality of sponge iron like temperature, time, particle size, type of reductant, type and dimension of crucible were discussed. Groups of particle size was 0-150,150-500,500-1000microns and temperature range was 900, 950, 1000, 1100, 1150°C. Time of tests was between 2 to 30 hours.at 1000 °C and 10 hours maximum metallization degree was 94.76.while at 1100 °C and 5hours better metallization degree was achieved. at 1000 °C and 5 h, particles with 500-1000micron size had better result than other groups.at higher temperature effect of particle size was gradually decreased and rate of reaction and volume of producing gases from reduction process was increased .In studying type of crusible, SiC and clay-graphite crucible were used and SiC crucible had a better metallization degree .solid reductants were coal and metallurgical coke .coal had volatile material and better reactivity than coke and when coal used as reductant, better metallization degree was achieved. Maximum degree of metallization at 1150 °C, 0-150micron paticle size, SiC crucible and when coal was used as reductant, was 98.62 percent
  9. Keywords:
  10. Direct Reduction Process ; Hoganas Process ; Coal ; Sponge Iron ; Metallization Degree

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