Ring mechanism of iron ore pulverized coal-based reduction rotary kiln
The phenomenon of rotary kiln ring seriously affects the quality of reducing materials and will re-duce production efficiency,so it is necessary to explore the mechanism of powder reduction rotary kiln ring and take certain measures to alleviate this phenomenon.PB powder and anthracite were selected as the raw materials,the products reacted with refractory bricks that have Al2O3 and SiO2 as the main components,and the microstructure of different temperatures,carbon formulations and lower rings of materials were character-ized by scanning electron microscopy-energy spectrum analysis.The results show that with the increase of tem-perature,the structure of the ring sample become tighter,the number of stomata and pore size decrease,and the white filamentous structure gradually appeares in the ring structure.When the temperature is between 1 050-1 150 ℃,the ring structure still has small holes,and when the temperature rises to 1 200 ℃,there are almost no pores.With the increase of carbon-oxygen ratio,the pore size of the ring material gradually increas-es,and when the carbon-oxygen ratio increases from 0.75 to 1.75,the pore size of the ring material increases from 0.36 pm to 0.87 pm,and it is obvious that the ring structure is gradually loosened.The particle size has a significant impact on the material ring,the larger the particle size of the material,the more difficult it is to crunch,and the ring structure is relatively loose.When anthracite coal is selected as the reducing agent,the No.1 fine powder circle mainly contains iron phase,silicate phase and iron spinel,and the No.2 fine powder circle mainly contains iron phase and a small amount of iron oxide phase and some silicate phase.When PB powder is selected as reduced iron ore powder,bituminous coal rings mainly contain iron phase and silicate phase.
rotary kilnringliquid phase formationamount of carbon distributionmicrostructure
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