Innovative application of two-stage sulfuric acid leaching for efficient recovery of Ti from titanium-bearing electric furnace slag

Kinetics of extracting valuable components from Ti-bearing blast furnace slag by acidolysis with sulphuric acid

“…It can be seen from Figure 1 that the main phase of TBFS is an amorphous structure, and the analysis in Figure 2 shows the high correlation between occurrence of Ti, Mg, and Al. Therefore, Ti, Mg, and Al are considered as a whole to calculate the total extraction rate of the components in the dynamic simulation ( Nie et al, 2020 ; Nie et al, 2023b ). The correlation calculation is carried out by investigating the relationship between the total extraction rate and the acidolysis time at different reaction temperatures, acid-slag ratio, and raw material particle sizes.…”

“…Among the various extraction processes, sulphuric acidolysis has rapidly become a research hotspot because of its mature process technology, stable and easy-to-control reaction, simple operation and the ability to extract a variety of valuable components simultaneously. In the process of using sulfuric acid to hydrolyze TBFS, whether dilute or concentrated sulfuric acid as a reaction agent, or use one stage leaching ( Jiang et al, 2010 ), or two stage leaching ( Nie et al, 2023a ), or roasting ( He and Wang, 2023 ), or hydrothermal as reaction method, the extraction rate for titanium is high using this method ( Valighazvini et al, 2013 ; Zhang et al, 2022 ; Li et al, 2024a ). The acidolysis of TBFS using sulfuric acid can convert solid phase Ti, Mg, and Al into soluble Ti 4+ , Mg 2+ and Al 3+ , which are then sequentially separated by boiling hydrolysis and stepwise precipitation ( Hongjuan et al, 2015 ).…”