Sponge iron
Sponge iron

MANUFACTURING PROCESS

PELLET and non-coking coal are the prime raw materials for the production of sponge iron through.

The process of sponge iron making aims to remove oxygen from PELLET. When that occurs, the departing oxygen causes micro pores in the ore body making it porous.

Sponge iron is distinct due to its high metallic iron content and consistent chemical and physical characteristics. This provides secondary steel makers flexibility in preparing their furnace charge to produce finer quality steels than what is possible using steel scrap only. Some of the features of the sponge iron produced are:

  • High iron content and high degree of metallization
  • Uniform and consistent quality
  • Lower sulphur and phosphorus content
  • Negligible tramp element
  • Minimum dust generation during material handling
  • Good flow ability in bins, pipes and conveyors for continuous and trouble free charging
  • Superior technical support to induction furnace operators
  • The quality of sponge iron is primarily ascertained by the percentage of metallization (removal of oxygen), which is the ratio of metallic iron to the total iron present in the product.

The properties of sponge iron typically produced are :

Constituent Percentage
Chemical
Fe, Total 62-64
Fe, Metallic 79 – 81
Metallisation 92% to 94%
Sulphur 0.03 max
Phosphorus 0.05 max
Carbon 0.10 max
Gangue content 6-8
Constituent Percentage
Physical
Size Lump +4 mm
Fines -4 mm
Bulk density 1.6-2.0 MT/m3
Inherent density 3.5 MT/m3 (approx)

The quality of products are ensured by various checks at multiple stages of manufacturing and ensures the right product goes to customers.

SALIENT FEATURES OF THE PRE-HEATING TECHNOLOGY USED IN BMMIL

  • LOWER COST OF PRODUCTION
  • HIGH PRODUCTIVITY
  • LOWER COAL CONSUMPTION
  • WASTE HEAT UTILIZATION
  • ENVIRONMENT FRIENDLY
  • SAFER TECHNOLOGY
  • POWER GENERATION

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