Recovery of high grade phosphoric acid from wet process acid by solvent extraction with aliphatic alcohols

The potential for mining trace elements from phosphate rock

“…In addition, the precipitate is very difficult to filter, and a typical product usually contains a large portion of co-precipitated impurities. Solvent extraction has been found to be a very promising process for industrial recovery or removal of many elements (Abdel-Khalek et al, 2011;Amin et al, 2010;Radhika et al, 2010), and it has been proven to be effective in removing U, REE, Cd, and other metals (Table 4). However, solvent extraction has limited industrial application due to its unfavorable economics (high prices of reagents), technical challenges (high loss of solvent, extractant dispersion, introduction of new impurities), and environmental concerns (pollution of solvent and formation of new impurities) (Hinojosa Reyes et al, 2001;Sadegh Safarzadeh et al, 2007).…”

Separation of phosphoric acid and nitric acid mixtures with tri-n-butyl phosphate at 303.2K

“…It could be explained as electronic effects which acts directly on the interactions. H 3 PO 4 and HNO 3 molecules would form hydrogen bond with TBP molecules [5,7,15]. TBP could combine with H 3 PO 4 easily when the content of phosphoric acid is far more than that of nitric acid.…”

“…The wet process (sulfuric acid, hydrochloric acid or nitric acid) is the most economical method of production. However, the wet process using phosphoric acid (WPA) contains many impurities beside solids and organic matters [7,8]. Many chemical techniques have been investigated for purifying WPA, e.g., precipitation, crystallization, ion exchange, electrodialysis and solvent extraction [3,5,[9][10][11].…”

Purification of Wet Process Phosphoric Acid by Solvent Extraction using Cyclohexanol

“…Aliphatic alcohols, such as butanol, hexanol and octanol, have been studied as extractants diluted in kerosene for purification of WPA. The experimental results show that alcohol-kerosene mixtures have the advantages of favorable efficiency and selectivity to H 3 PO 4 and are cheap, easy to use and they separate quickly without emulsification and three phase formation [12]. Compared with these above-mentioned alcohol extractants, cyclohexanol has good immiscibility with the aqueous solution and physicochemical stability due to its ring structure.…”