Optimization study on pelletizing parameters based on rotary hearth furnace process
The direct reduction process in rotary hearth furnaces is a common method for treating metallurgical dust.This process can fully recycle useful components such as Fe,C and Zn from the dust.The paper analyzes the chemical composition and particle size of the dust and investigates the impact of moisture on the burst temperature of green pellets produced through disc pelletizing.The study analyzed the impact of pelletizing time,binder content,and mass ratio of carbon to oxygen(C/O)on pelletizing rate,and pellet performance,and optimizes the pelletizing parameters of the rotary bottom furnace.The results show that the moisture content of green pellets after drying should not exceed 4.0%.Pelletizing time,binder content,and C/O have a significant impact to the pelletizing rate and pellet quality.Optimal pellet quality,with a qualified rate of 60.32%,is achieved when the pelletizing time is 12 min,the bentonite content is 3.0%,and the C/O is 0.7.
rotary hearth furnacebursting temperaturepelletizing timebinder contentmass ratio of carbon to oxygen
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