在1100~1350℃,1000 Pa,3倍碳当量条件下,采用微波加热方法对碳还原转炉钢渣的气化脱磷反应进行了宏观动力学分析.结果表明,微波加热条件下,气化脱磷率为31.0％~35.7％,该气化脱磷反应为二级反应,活化能为55.52 kJ/mol,并得到了气化脱磷反应速率常数与温度的关系式,同时界面化学反应为可能的限制性环节.通过提高反应温度、减小钢渣及焦炭粒度、增大反应物料接触面积,可提高气化脱磷反应的速率.研究结果为探明微波碳热还原脱磷反应的机理及速率问题,实现转炉钢渣在钢铁企业内部的循环利用提供了理论依据.
Under the condition of 1 100-1 350℃,1 000 Pa,and carbon equivalence of 3 times,the macrokinetics of gasification dephosphorization for converter slag was studied by microwave heating.The results show that the gas-ification dephosphorization rate is 31.0%-35.7%,the reaction order of gasification dephosphorization is 2,and the reaction activation energy is 55.52 kJ/mol.So the interfacial chemical reaction is the possible restrictive step for gasification dephosphorization,and the relationship between chemical reaction rate constant and temperature is obtained by dynamic analysis method.The gasification dephosphorization rate can be improved by increasing the temprature,reducing particle size of slag or coke,and increasing contacting area of the reaction materials.The re-sults make mechanism and rate of gasification dephosphorization clear and provide theoretical basis for recycling of converter slag in iron and steel enterprises.
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