OOIR: Observatory of International Research

Papers

(The H4-Index of Hydrometallurgy is 30. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2022-05-01 to 2026-05-01.)

Article	Citations
Lipophilic EDTA-based ligands in different diluents for the extraction of rare earths: Preliminary results with Nd(III), Dy(III) and Pr(III) in chloride and nitrate media	161
Recovery process of rare earths, Al, U, and Th from ionic rare earth purification residue using sequential alkaline leaching, acid leaching solvent extraction and stripping	105
Impurity incorporation and selective removal in NiSO₄•6H₂O crystals: Mechanistic insights for battery-grade purification	104
A leaching, solvent extraction, stripping, precipitation and calcination process for the recovery of MoO3 and NiO from spent hydrofining catalysts	75
Continuous recovery of lithium and boron from Jezechake Salt Lake brine using fixed-bed adsorbers	61
Stepwise recovery of gallium (Ga), lithium (Li), and rare earth elements (REEs) from roasted coal gangue based on leaching kinetics differentiation	58
Green and low-carbon preparation of ammonium paratungstate by adding ammonia to ammonium metatungstate solution	58
Kinetics of ultrasound-assisted solvent extraction of vanadium with methyltrioctylammonium chloride (MAC)	57
Ternary extractant system consisting of PC-88A, TOPO, and Versatic 10 for recovery of scandium(III) from nickel laterite processing liquors	55
Cesium ion sorption on hybrid pectin-Prussian blue beads: Batch and column studies to remove radioactive cesium from contaminated wastewater	52
Utilization of CO2 as a precipitant to prepare aluminum hydroxide from NaAl(OH)4 solutions: Study on reaction kinetics and mechanism	52
Waste reduction and high value utilization of jarosite-alunite residue (JAR) produced from the recovery of spent lithium-ion battery	52
Phase evolution and elemental distribution of zinc and germanium during the sulfide roasting, zinc fuming and leaching processes: Benefit of pretreating zinc oxide dust	49
Editorial Board	49
A comparison of batch and semi-batch reactors for leaching battery cathodes (LiCoO2) under controlled addition of HCl and H2O2	49
Research on the migration of rubidium and mineral phase changes during sulfuric acid leaching of biotite	45
A preliminary study of a sequential leaching process to recover Ag, Au, Cu, and Sn from E-waste	44
Scaling analysis of electrodeposited copper and the influence of a modified polysaccharide on surface roughness	43
Determination of the kinetic parameters of leaching from experimental data using the non-porous shrinking particle model: Effect of error propagation	40
Reducing silica in zirconium leachate from washed and dried frit powder: Role of cold and concentrated nitric acid and avoidance of crud formation	38
On the mechanism of the dissolution of gypsum (calcium sulfate dihydrate)	38
Atmospheric acid leaching of powdery Ni-Co-Fe alloy derived from reductive roasting of limonitic laterite ore and recovery of battery grade iron phosphate	37
Editorial Board	35
Thermodynamic analysis and application for preparing FePO4 from nitric acid pressure leach laterite residue by selective leaching in phosphoric acid and induced precipitation	35
Editorial Board	35

Cobalt and nickel separation in aqueous two-phase systems with polyethylene glycol 20,000 and sodium electrolytes	34
Study on pre-oxidation of silver concentrate and leaching behaviour of Zn, Cu and In during oxygen-pressure leaching	33
Extraction of chloride from slag flush wastewater using solvent N235	32
The circularity of turning wastes into valuable resources: Rare earth elements recovery from phosphogypsum – A short review	32
Recovery of vanadium from direct acid leaching solutions of weathered crust vanadium‐titanium magnetite via solvent extraction with N235	31
Moisture absorption rates via capillary suction within packed beds – The effect of material and fluid properties with implications for heap leaching operations	30
Thorium speciation in synthetic anhydrite: Implications for remediation and recovery of thorium from rare-earth mine tailings	30
A magnetic adsorbent with metal-organic framework based on ammonium phosphomolybdenum heteropoly tungstate (AWP): Selective adsorption of Rb+ and Cs+ from aqueous resources and stripping with ammonium	30
Role of arsenic(V) and bismuth in the recovery of antimony by hydrolysis and precipitation from eluates produced during copper electrorefining	30
Extraction of gold from a gold concentrate using a lixiviant synthesized by a roasting process	30