Study on Dephosphorization of Coke Reduction Converter Slag by Gasification

In order to solve the problem that phosphorus content in slag is too high to be recycled directly in converter,the influence of different temperature,alkalinity,FeO content and nitrogen flow rate on gasification dephosphorization rate was systematically studied by means of related hot state experiments in laboratory.The results show that the dephosphorization rate increases with the increase of temperature and nitrogen flow rate.When the temperature and nitrogen flow rate are controlled at 1 923 K and 0.45 m³/h,respectively,the dephosphorization rate can reach 76.26% and 64.57%.The gasification dephosphorization rate increases gradually with the decrease of alkalinity.When the alkalinity is controlled at 1.8,the gasification dephosphorization rate of 70.35% can be achieved.When the FeO content ranges from 16% to 32%,the dephosphorization rate increases first and then decreases with the increase of FeO content.When the FeO content is 24%,the dephosphorization rate is 66.75%.Therefore,in order to achieve the gasification dephosphorization rate more than 60%,the temperature should be controlled at about 1 873 K,alkalinity at 1.8,FeO content at 24%,and nitrogen flow rate at 0.45 m³/h.The experimental results provide theoretical and technical support for the development of slag recycling process.