Recovery of sulphuric acid from waste and process solutions using solvent extraction

Application of membrane distillation and solvent extraction for water and acid recovery from acidic mining waste and process solutions

“…Waste waters produced and disposed of at modern mine sites 9 are problematic because they contain hazardous substances (e.g. 10 heavy metals, metalloids, acids, process chemicals), and therefore 11 require treatment before disposing to the environment.…”

“…SX is a well-established treatment method to purify and recover 71 metals from waste solutions [9]. It is not a method for water 72 recycling; however, it is used in hydrometallurgical processes such as 73 recovering of acids (H 2 SO 4 , HCl), precious heavy metals and 74 treatment of metalloids present in a wastewater [9].…”

Preparation of calcium carbonate and hydrogen chloride from distiller waste based on reactive extraction–crystallization process

“…There are four conventional methods [30] to investigate the structure of extraction complex -equivalent molarity method, chemical analysis method, saturation method, and slope method, among which the slope method is the easiest and the complex structure can be obtained just by the transformation of mathematics formula; therefore, it has been applied extensively [31]. However, our study not only involved simply the extraction process, but a complicated reactive extraction-crystallization process to which it was difficult to apply the slope method.…”

Development of a hydrometallurgical process for the recovery of calcium molybdate and cobalt oxalate powders from spent hydrodesulphurization (HDS) catalyst

“…It has been reported that distilled water can be used to strip small amount of metal (Banda et al, 2013a), hydrochloric acid (Banda et al, 2013b), and sulfuric acid (Kesieme et al, 2013) Fig.4. The CaMoO 4 microstructures with morphologies of ellipsoid-like and chrysanthemum-like were formed at 55 o C (Fig.…”