Mechanisms of dissolution of iron oxides in aqueous oxalic acid solutions

Hierarchically-organized, well-dispersed hydroxyapatite-coated magnetic carbon with combined organics and inorganics removal properties

“…If the density of acidic groups on the surface is not sufficient and/or calcium ions are in excess, then mineral precipitation can occur in solution, independently of the templating substrate. Here it was also observed that an excess of aspartic acid is able to dissolve the iron oxide nanoparticles, plausibly because of its strong chelating properties, as 9 already demonstrated for oxalic acid [27]. However we found out that, once optimal concentrations have been determined, the procedure was highly reproducible in terms of mineralization rate and HAp nanocrystal dimensions.…”

Treatment Tank Corrosion Studies for the Enhanced Chemical Cleaning Process

“…At pH levels between 1 and 1.5 with oxalic acid concentrations of approximately 2.5 wt.% so that in addition to the di-oxalatoferrate complex another iron (III) oxalate complex, the tri-oxalatoferrate species, Fe(C 2 O 4 ) 3 3- [20,21], is present in significant quantities. This species has been show to be reduced according to the following reaction:…”

Model for Predictive Analysis of Heat Absorbed by Oxalic Acid Solution Relative to the Solution Temperature during Leaching of Iron Oxide Ore

“…Using oxalic acid, the dissolved iron can be precipitated from the leach solution as ferrous oxalate, which can be re-processed to form pure haematite by calcinations [6]. Many researchers have studied the use of oxalic acid to dissolve iron oxide on a laboratory scale [7][8][9][10][11][12][13]. Lee et al [14] used 0.19-0.48M oxalic acid to dissolve hydrated iron oxide.…”