• The recovery of rare earth metals from WEEE leaching

    2018 2 27 This study investigated the extraction stripping and recovery of REMs from a WEEE leaching solution using Versatic 10 as carrier in the organic phase and oxalic acid as stripping agent A factorial design was carried out to evaluate the simultaneous effects of factors as the feed phase pH and the concentrations of both extractant and organic

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  • Cleaning with Oxalic Acid Here s What You Need to Know

    2021 7 30 Oxalic Acid is a reliable effective cleaner when used in appropriate applications Oxalic Acid may be used to remove rust and other difficult stains from areas such as buildings boats swimming pools concrete driveways sidewalks iron machinery wood decks stairs or trim Oxalic also has a reputation for being an excellent wood bleach

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    A facile method for the simultaneous recovery of rare

    3 by leaching in a HF solution or Nd oxalate by adding an aqueous oxalic acid solu tion The REE oxalate can then be calcined to form REE oxides REOs Both the REF 3 and REOs can then be reduced to the corresponding REE metal e.g molten salt electrolysis8 After removal of the REE sodium–sulphate double salts oxygen gas or a H 2O

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  • Combined filtration and oxalic acid leaching for

    2021 2 1 However the oxalic acid loss to the precipitate is relatively small as Fig 4 reveals In general phosphorus recovery from hydrochar via combined filtration and leaching using oxalic acid is a promising approach However several technical issues need to be solved 4 Conclusion

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  • Leaching kinetics of iron from low grade kaolin by oxalic

    observed that increasing oxalic acid concentration increases the iron dissolution rate from low grade kaolin It is also seen that the iron leaching rate at 50 °C is higher than at 25 °C e.g

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  • Optimization of oxalic acid production for bioleaching of

    A brown rot fungus an unknown Polyporales sp KUC8959 has recently been identified and proven as a prominent fungal species for bioremediation of CCA treated wood wastes in our Lab The fungus produced a larger amount of oxalic acid than other fungi tested and removed 90 or more of chromium copper and arsenic from CCA treated wood sawdust through bioleaching process.

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    Mobility of Metals from Mine Tailings using Different

    2020 4 2 The batch leaching studies indicated high mobility of elements at low pH short exposure time high concentration of organic acids and high temperature Increase of temperature resulted to faster release of metals with maximum concentrations of Fe and Al recorded at 48 hours Oxalic acid and citric acid were found as best leaching agents.

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  • Bioleaching metals from waste electrical and electronic

    2021 7 2 They explained that citric acid plays the most important role in the metal extraction process of A niger Saidan et al 2012 even if the leaching of Cu and Ni is destroyed by oxalic acid through precipitation Cu and Ni can still be extracted by oxalic acid and other organic acids produced by A niger Optimization of organic acids production

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  • Optimization of oxalic acid production for bioleaching of

    A brown rot fungus an unknown Polyporales sp KUC8959 has recently been identified and proven as a prominent fungal species for bioremediation of CCA treated wood wastes in our Lab The fungus produced a larger amount of oxalic acid than other fungi tested and removed 90 or more of chromium copper and arsenic from CCA treated wood sawdust through bioleaching process.

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  • Recovery of valuable metals from waste printed circuit

    2021 2 7 Organic acids such as citric acid itaconic acid and oxalic acid synthesised by Aspergillus niveus were used for the bioleaching of metals from waste printed circuit boards Bioleaching of valuable metals was performed in one step two steps and spent medium approaches using A niveus.In the absence of waste printed circuit boards WPCBs the dry cell weight of A niveus was higher when

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    A facile recovery process of cathodes from spent lithium

    2018 9 25 3.1.1 Effect of oxalic acid concentration The effect of oxalic acid concentration on leaching efficiency was studied in the range from 0.1 to 1.5 mol L 1 at temperature of 80 °C reaction time of 60 min and solid/liquid ratio of 60 g L 1 As shown in Fig 2 with increased oxalic acid concentration the leaching efficiency of Li increased

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    Platinum Group Metals Recovery Using Secondary Raw

    DES comprising choline chloride and oxalic acid Figure 2 The solvent is first used to leach the pgms from the solid feedstock at a temperature <90ºC followed by a reduction of the pgms to their metallic form by heating the solution to >100ºC Centrifugation was employed at this laboratory scale based on equipment availability separately

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  • Use of Microwave Assisted Deep Eutectic Solvents to

    2021 4 5 Oxalic acid H 2 C 2 O 4 2H 2 O contains crystal water which would separate out at 100°C and this led to the precipitation of Mn compounds from ChCl–OA.27 The higher temperature and evaporation of crystal water at 125°C causes an increase in the leaching efficiency of Mn and Li.

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  • CO2 scrubber supplies raw material for oxalic acid

    2019 4 1 A novel carbon capture project at Michigan Technical University MTU Houghton Mich mtu.edu couples the collection of carbon dioxide from power plant fluegas with a system to use the captured CO2 as a raw material to make oxalic acid which can be used in the mining industry to leach rare earth elements from ore.

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