An innovative method for processing Egyptian monazite

Solubility behavior of rare earths with ammonium carbonate and ammonium carbonate plus ammonium hydroxide: Precipitation of their peroxicarbonates

“…Sinha [3] [5] produced various rare earth concentrates using carbonate as precipitant, some of them for industrial application as a "rare earth carbonate", "didymium-45 carbonate", "didymium-50 carbonate", "neodymium-85 carbonate" and "yttrium-85 carbonate". More recently Abdel-Rehim [6] used ammonium carbonate-ammonium bicarbonate for the autoclave leaching and separation of thorium, uranium and rare earths. de Vasconcellos et al [7,8] exploited the selective dissolution of yttrium in ammonium carbonate starting from an industrial low cerium carbonate concentrate.…”

High‐efficiency recovery of rare earth ions by hydrolyzed poly(styrene‐co‐maleic anhydride)

“…Specifically, polymeric adsorbent are widely used in modern adsorption separation technology due to their favorable physicochemical stability, large adsorption capacity, excellent selectivity, and structural diversity. 20,21 For instance, poly(acrylamide-expanded perlite), a novel composite, was synthesized for the enrichment of Tb(III) ions, 22 and magnetic nanocomposite hydrogel with ZnO-initiated photopolymerization adsorbed La(III) ions. 23 In our previous work, we have reported the synthesis of macromolecular metal complexes (MMC) containing thorium with polymeric ligands, and this process can be used for recovery radioactive element Th.…”

“…To determine adsorption kinetics, the initial test solution was sampled at various time intervals (3,6,9,15,20,30,40,60,90, and 120 min) and at 298.15 K. In adsorption isotherms study, solution with various initial concentration (20,30,35, and 40 mg L 21 ) of individual metal ion were treated at diffident temperature (298, 308 and 318K). In the effect of pH, the pH value of solution was adjusted by adding either 0.1 mol L 21 NaOH or 0.1 mol L 21 HCl.…”

Mechanochemical decomposition of monazite to assist the extraction of rare earth elements

“…phates in monazite are transformed into the rare earth hydroxides. The rare earth hydroxides obtained from the alkaline processing can be easily dissolved in acid after removal from supernatant solution of alkaline phosphates [7]. In any case, for the decomposition, however, precise processing controls at high temperature, pressure and pH are needed to extract the rare earth elements from monazite.…”