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为研究球团添加菱镁石熔剂对焙烧工艺制度的影响,在实验室条件下,将菱镁石熔剂添加到普通酸性球团中,利用傅立叶导热微分方程推导了球体不稳定导热微分方程,采用有限差分求解方法解析了菱镁石熔剂对球团传热过程的影响。分析结果表明:在相同焙烧条件下,普通酸性球团完成焙烧的时间为8.35 min,添加菱镁石熔剂的球团为9.13 min。建议在生产含氧化镁的酸性球团时,应适当提高预热段温度使熔剂中碳酸盐充分分解或适当延长焙烧时间,以实现球团的合理焙烧。
In order to study the influence of adding magnesite flux on roasting process, the magnesia flux was added to normal acid pellets under laboratory conditions. The differential thermal conductivity equation was deduced by Fourier heat conduction differential equation. The influence of magnesite flux on pellet heat transfer process is analyzed by finite difference method. The analysis results show that the roasting time of ordinary acid pellets is 8.35 min under the same calcination conditions, and the pellets with addition of magnesite flux are 9.13 min. It is suggested that during the production of acidic pellets containing magnesia, the temperature of the preheating section should be properly increased to fully decompose the carbonates in the flux or prolong the roasting time appropriately to achieve reasonable roasting of the pellets.