Study on the reduction reaction characteristics of Quasi-east coal and blast furnace dust mixed combustion

2018 4th International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Teng, Haipeng^1 ; Shu, Tongsheng^1 ; Yang, Sha^1 ; Liu, Jiaojiao^1

School of Chemical Engineering, Northwest University, Xi'an, China^1

关键词: Generation rate;    Minimum free energy principles;    Mixed combustions;    Reaction characteristics;    Reaction system;    Reducing atmosphere;    Reduction reaction;    Zinc production;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/252/2/022014/pdf
DOI  :  10.1088/1755-1315/252/2/022014

来源: IOP

【 摘 要 】

Based on Gibbs' minimum free energy principle, the change of iron and zinc reduction and the change of sulfur dioxide during the mixed combustion process of quasi - east coal and blast furnace dust were studied. The results show that the reducing atmosphere of the reaction system is enhanced as Actual oxygen flux and theoretical oxygen demand ratio decreased and the temperature increased, and the reaction characteristic is more favorable for the reduction and precipitation of zinc and iron. When Actual oxygen flux and theoretical oxygen demand ratio is 0.5 and 0.75, the generation rate of elemental zinc and elemental iron increases as the temperature reaches 600 °C-800 °C. At this time, the amount of SO2 is small as the Actual oxygen flux and theoretical oxygen demand ratio is 1,1.25 and 1.75, When the temperature continues to rise from the 800 °C to 1800 °C, the amount of zinc production is stable at 4.225mol, elemental iron production decreased rapidly, sulfur dioxide content continues to rise.