Influence of alkali metals on the structure and properties of blast furnace coke
Coke is a crucial component in the smelting process of blast furnaces.As blast furnaces continue to develop on a larger scale,the quality of coke must meet higher standards to improve smelting intensity.The alkali metals present in the raw materials of blast furnaces have a significant impact on the structure and metallurgical properties of coke.To ensure stable and smooth operation of the blast furnace,it is necessary to have a clear understanding of the mechanism of coke deterioration during the smelting process.Reasonable measures for quality control of coke should be taken.This study investigates the effects of alkali metals,specifically potassium and sodium,on the structure and performance of coke using a gas-phase adsorption method.The basic performance of coke was tested and analyzed,and the microstructure of coke,including cracks and pores,was observed through industrial computed tomography(CT)scanning.The study found that the degradation of coke structure was greater with potassium vapor than with sodium vapor.As the amount of potassium vapor increased,the degree of coke pulverization,coke crack extension,and pore size also increased.However,after the coke adsorbed 5%sodium vapor,there were only minor changes in the cracks and pores inside the coke.
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