The Influence Mechanism of Alkali Metals on the Ring Formation in Rotary Kilns in Oxidized Pellet Production
Ring formation in rotary kilns is the main factor restricting the production of oxidized pellets.The formation of rings inside the kilns can affect the distribution of temperature field and reduce the inner diameter of the rotary kiln,leading to the deterioration of the strength and performance of the finished ore and an increase in production energy consumption.Improving the problem of ring formation can help reduce energy consumption in the production of pellets by rotary kilns,improve the quality of pellets,and promote energy conservation and emission reduction in the agglomeration making process before iron-making.A key analysis on influence mechanism of alkali metals(K/Na)on the ring formation in rotary kilns are conducted.It is concluded that K2 O and Na2 O enter the liquid phase through the formation of low-melting-point substances and achieve enrichment in the micro-zone liquid phase.An increase in the content of K2 O and Na2 O will significantly reduce the melting temperature of the low-melting-point substances and increase the proportion of liquid phase.The actual industrial production should reduce the introduction of K2 O and Na2 O from the source and improve the ring-formation behavior.
ring-formation material in rotary kilnlow-melting-point substancesalkali metal
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维普
