测定铁矿粉同化特性新方法的探索

A New Method for the Measuration of Assimilation Characteristics of Iron Ore Powder

指出目前测定铁矿粉与CaO同化反应方法的优缺点.铁矿粉只有先在界面上熔化形成液相并与CaO形成润湿后,才能进行同化反应形成铁酸钙.通过X射线衍射分析给出了判别铁矿粉与CaO同化反应的始末点等参数的方法,以此为基础建立了以实际烧结生产温度为基准温度且量纲为1的同化反应特征数.该特征数综合了铁矿粉同化反应过程中各种重要信息,如升温速率、同化反应温度和同化反应速度等参数,改进了以往方法不考虑同化反应过程的缺陷,避免了用多个参数表示同化反应过程的不便.

The advantages and disadvantages of the measuration methods currently used of assimilation reaction between iron ore powder and CaO were indicated.The iron ore powder was first melted into liquid phase at the interface wetting CaO which led to the assimilation reaction that formed calcium ferrite.Discriminated methods of the parameters of the assimilation reaction such as starting and finishing temperatures were confirmed by X-ray diffraction analysis.Upon this,the assimilation characteristic number taking the actual sintering temperature as the reference temperature was established.This assimilation characteristic number was a dimensionless number including kinds of important information during the assimilation reaction process,such as the heating rate,the assimilation reaction temperature and the assimilation reaction velocity,which overcame the shortcomings of the previous methods without considering the assimilation reaction process,and avoided using multiple parameters to characterize the assimilation reaction process.