Effect of SiO2 and Al2O3 in gangue on ring-forming behaviors of acidic and alkaline pellet powder in rotary kilns
The effect of SiO2 and Al2O3 content in gangue on the ring-forming behaviors of acidic and alkaline pellet powder in rotary kilns was studied.The briquetting and roasting experiments were carried out to simulate the ring-forming process of pellet powder in rotary kilns.Meanwhile,the changes in gangue composition were simulated by adding SiO2 and Al2O3 analytical reagents to raw materials at different dosages.The effect of alkalinity,SiO2 and Al2O3 content on the compressive strength of the powder consolidations and their microstructures were investigated.The liquid phase production and consolidation strength of alkaline pellet powder were much greater than those of acidic pellet powder under the same conditions.The consolidation strength of acidic pellet powder decreased with increasing SiO2 content,while that of alkaline pellet powder decreased first and then increased.Furthermore,the consolidation strength of acidic and alkaline pellet powder both increased first and then decreased with increasing Al2O3 content.Therefore,the SiO2 and Al2O3 content in raw materials can be appropriately adjusted in pellets production by adjusting the structure of raw materials,reducing the ring formation in rotary kilns effectively.
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