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- Solvent extraction of coal by aromatic compounds at atmospheric pressure
- Recovery of phosphates and metals from phosphate sludge by solvent extraction
- Solvent extraction of nitrate from titanium leacher effluent
- Solvent extraction of nickel and copper from laterite-ammoniacal leach liquors
- Preparation of ammonium paratungstate from a sodium tungstate-sodium chloride phase
- Gallium and germanium recovery from domestic sources