Separation and recovery of sulfuric acid from acidic vanadium leaching solution of stone coal via solvent extraction

Selective extraction of nitric and acetic acids from etching waste acid using N235 and MIBK mixtures

“…12(b) were attributed to the NO À 3 antisymmetric stretching vibration. Therefore, nitric acid was extracted by N235 via the formation of an ion-pair complex, which is consistent with the literature [28,29].…”

Increasing sustainability on the metallurgical industry by integration of membrane nanofiltration processes: Acid recovery

“…Nowadays, with the focus on the recovery of valuable by-products, other techniques such as electrodialysis [9][10][11], diffusion dialysis [12,13] and ion-exchange [14,15] have been postulated to recover acids and to remove undesired components. Among these proposed techniques, nanofiltration (NF) is gaining importance for the treatment of acidic waters, mainly due to its properties, exhibiting high rejection of multi-charged ions (e.g.…”

Effects of different alkalis on the behaviour of vanadium loss in the pretreatment of vanadium-bearing acid leaching solution

“…Among the reagents used for vanadium extraction, the acid extractant D2EHPA (Bis(2-ethylhexyl) phosphate) provides advantages of acid system adaptability and easy stripping [20][21][22] . The appropriate pH range for solvent extraction of vanadium is 1.5-2.5; however, the acidity of the acid leaching solution is often excessive, requiring pretreated to allow subsequent steps in the extraction process 23,24 . Some methods for the disposal of acid leaching solution have also been developed, these include ion exchange, solvent extraction, and alkali neutralization [25][26][27] .…”