Simultaneous CO2 mineral sequestration and rutile beneficiation by using titanium-bearing blast furnace slag: Process description and optimization

A green strategy for the selective recovery of lithium and the synthesis of CoFe2O4 catalyst for CO oxidation from spent lithium-ion batteries

“…1e) showed that SO 2 release from copperas started at roasting temperatures of above 400 °C, and the released SO 2 concentration increased significantly above 600 °C, reaching a strong peak of 3897 ppm at around 640 °C, and then decreased to 266 ppm at 800 °C, due to the decompositions of FeSO 4 and the intermediate product Fe 2 (SO 4 ) 3 . 24,26,27 However, when copperas and LCO were mixed and roasted at a mass ratio of 1.4 : 1 (stoichiometric molar ratio), the SO 2 emitted by copperas was almost completely eliminated, which may be due to the migration of sulfur from FeSO 4 to Li 2 SO 4 without emitting into the atmosphere. During the holding at 800 °C, the copperas alone condition still released a small amount of approximately 100 ppm of SO 2 gas, whereas the mixture of copperas and LCO exhibited minimal SO 2 emissions.…”

“…The process utilizes waste copperas as the sole additive, which is a solid waste generated during TiO 2 production with the main composition of FeSO 4 ·7H 2 O. 23–26 Fig. 1(a) illustrates the process flow diagram.…”

A recyclable method for titanium extraction and oxygen evolution from Ti−bearing slags

“…Instead of generating CO 2 , O 2 is produced if inert anodes are used in the electrolytes, thus effectively achieving carbon neutrality on a global scale [20] , [21] , [22] . In China, hundreds of millions of tons of Ti−bearing blast furnace slag (TB−slag) have been discarded as waste because of the difficulty of their direct utilization [ 23 , 24 ]. If these Ti−bearing slags are reused in MOE, environmental problems can be solved and significant economic value can be created.…”