Recovery of rare earths and base metals from spent nickel-metal hydride batteries by sequential sulphuric acid leaching and selective precipitations

Reclaiming rare earth elements from end-of-life products: A review of the perspectives for urban mining using hydrometallurgical unit operations

“…Addition of hydrogen peroxide or citric acid to sulphuric acid did not have a significant effect on the leaching of REEs (Innocenzi and Veglio, 2012;Rodrigues and Mansur, 2010).…”

“…The impurities were nickel (1.68%), cobalt (3.05%), manganese (0.29%), zinc (0.71%) and iron (6.9%) (Pietrelli et al, 2002). Innocenzi and Veglio (2012) have reported recovery rates of 99% for cerium and lanthanum when using hydroxide precipitation, with the major impurities being manganese (2.16%) and aluminium (2.93%).…”

Recoveries of Valuable Metals from Spent Nickel Metal Hydride Vehicle Batteries via Sulfation, Selective Roasting, and Water Leaching

“…Several techniques have been applied for the recovery of REEs and other valuable elements from NiMH batteries including acid leaching with various acids [3,4,7,[9][10][11][12][13][14][15][16], precipitation and solvent extraction methods with various reagents [5,[17][18][19][20][21][22], and pyrometallurgical methods [6,[23][24][25].…”

Pollution control and metal resource recovery for acid mine drainage

“…It then became worth considering the recovery of these metals. Selective precipitation has been tested for the recovery of the metal from the industrial waste water (Mauchauffée and Meux, 2007), the waste leaching solution (Innocenzi and Vegliò, 2012) and the mine waste water (Hammack and Edenborn, 1992;Hammack et al, 1994). Mechanisms for selective precipitation are based on the difference between the metal compounds' solubility products (Mauchauffée and Meux, 2007).…”