Patent classifications
C
CHEMISTRY; METALLURGY
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C22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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C22B
PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
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3/00
Extraction of metal compounds from ores or concentrates by wet processes
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C22B3/20
Treatment or purification of solutions, e.g. obtained by leaching
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C22B3/26
by liquid-liquid extraction using organic compounds
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