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- Solvent extraction of nickel and zinc from a waste phosphate solution
- Recovery of phosphates and metals from waste phosphate sludge by reduction-sinter processes
- Recovery of phosphates and metals from phosphate sludge by solvent extraction
- Recovery of zinc, copper, and lead-tin mixtures from brass smelter flue dusts
- Recovery of zinc, copper, silver, and iron from zinc smelter residue
- Converting stainless steel furnace flue dusts and wastes to a recyclable alloy