Microwave roasting of blast furnace slag for carbon dioxide mineralization and energy analysis

Abstract

This paper highlights the potential of microwave roasting in solid-waste treatment and carbon dioxide storage.

Advances in process development of aqueous CO2 mineralisation towards scalability

“…In this research, the moisture and hydroxyl group was removed efficiently with high steam temperature (650 °C) and H2SO4 was the most effective agent to increase the surface area of serpentine, which increased it from 8 to 330 m 2 •g -1 . Han et al (2020) applied a mircrowave roasting technique to enhance the mineralisation process with a mixture of slags and (NH4)2SO4, and the roasting time and energy consumption were significantly reduced with the help of microwave. The simulation results from Aspen showed that the production efficiency is increased more than 10 times and the energy consumption is decreased by 40% for capturing 1kg CO2.…”

The effect of 15 wt%Al2O3 addition on the equilibrium phase relations of CaO–SiO2–TiO2 system at 1400 °C in air

“…The titania-bearing slags are by-products of the reduction smelting of vanadium titano-magnetite ore, producing 10 wt.% -28 wt.% TiO2 [5] from blast furnace smelting or 40 wt.% -70 wt.% TiO2 [6] from electric furnace smelting. In order to efficiently recover Ti values in the slag, different hydrometallurgical processes, including sulfuric acid leaching [7] , alkaline roasting-leaching [8] and various pyrometallurgical processes including microwave assistant roasting [9] , supergravity separation [10] , and selective crystallization -separation [11] , have been proposed. In the pyrometallurgical processes, the key idea is to enhance the Ti element concentration in a titania-enriched phase by modifying the slag composition [12] .…”