Coal Based Rotary Kiln for Direct Reduced Iron / Sponge Iron (100 TPD, 350 TPD, 500 TPD)
Solid state reduction of Iron Ore using either coal/gas as a medium of reduction to produce a substitute raw material for steel making is termed as Direct Reduced Iron (DRI). Since DRI is produced by removing oxygen from iron ore, its structure is just like sponge with a network of connecting pores. These pores results in a large internal surface area which is about 10,000 times greater than the internal surface area of solid iron. Due to this, DRI is also known as Sponge Iron.
Sponge Iron is gaining more popularity because of the following reasons…
Scrap is getting scarcer by the day
Quality and composition variations are compelling
Tramp elements coupled with Sulphur and Phosphorus hamper the end product quality of sale-able steel
Uniform known composition, size and high bulk density compared to scrap
Low Capex and gestation period compared to Gas based DRI plant
It can be produced with non-coking coal and poor quality of coal that is available in abundance
Capability of forming protective layer of foamy slag in the bath
Potential of sensible heat recovery from waste gases
Maintenance of Sulphur level in steel by its removal during Sponge iron production**
Lower refining requirements of steel produced
It allows steelmaking to dilute metallic residuals in scrap
Main Components of the Rotary Kiln are…
Raw Material Handling & Storage
Rotary Kiln
Rotary Cooler
Magnetic Separators (MS)
Dust Settling Chamber (DSC)
Post Combustion Chamber (PCC)
Product Handling & Storage
Off Gas Handling & Cleaning System
Advantages of ET Design:
ET has the distinction of being the designer, producer and user of Sponge Iron
Equipment and project designed according to international norms for longevity and optimal productivity
Intelligent raw material proportioning system
Versatile design adaptable to use wide range of raw material grades
Facility to substitute natural gas for some portion of coal
Advanced instrumentation & automation to reduce utilities’ consumption
High combustion efficiency through gas monitoring system
Highly engineered plant layout for minimal material handling and smooth material flow
Efficient plant and process design for maximum waste heat recovery
Pollution free plant with state-of-the-art dust suppression and collection system