Desulfurization and Denitrification Performance of Modified Rice Husk Ash-Carbide Slag Absorbent

In the cement industry, SO2 and NOx are generally removed separately. There are many problems, such as large area, high investment cost, secondary pollution and so on. Desulfurization and denitrification technology have become a frontier research direction in the field of air pollution control. In this paper, rice husk ash and carbide slag were compounded and modified to prepare modified rice husk ash-carbide slag composite absorbent, and its desulfurization and denitrification performance and mechanism were studied. The results showed that the NO conversion and SO2 conversion of the modified rice husk ash-carbide slag composite absorbent increased by 44% and 2%, respectively, at 700 degrees C. Fibrous calcium silicate and calcium silicoaluminate hydrates were formed during the hydration process, which made the specific surface area of the absorbent larger and provided more reactive sites. The hydration process increases the content of oxygen-containing functional groups, decreases the hydroxyl/ether C-O functional groups, and increases the content of carboxyl-COO functional groups are conducive to the denitrification reaction.

Automated summary

The study focused on the performance and mechanism of modified rice husk ash-carbide slag composite absorbent in desulfurization and denitrification applications, showing an increased efficiency at 700 degrees Celsius. The formation of fibrous calcium silicate and calcium silicoaluminate hydrates during hydration process led to a larger specific surface area of the absorbent and more reactive sites, enhancing the denitrification reaction.