Recovery and purification of precious metal waste (copper, gold, silver, platinum, palladium, rhodium, ruthenium, iridium), 1: gold category: gold salt, gold liquid, gold paste, gold plating, gold wire, gold slag, gold wire, scrap, gold plated pendant, gold polishing ash, gold plating waste liquid, etc. 2: silver category: silver paste, conductive silver paste, silver electrode, silver wiping cloth, conductive silver paint, silver contact, silver powder, silver electrode, silver wire, silver chloride Silver zinc battery, etc. 3: various silver containing waste films, industrial flaw detection films, fixing solutions 4: palladium containing category: palladium slurry, palladium salt, palladium water, palladium carbon, palladium powder, palladium catalyst, palladium carbon catalyst, diphenylphosphine palladium, palladium tube, palladium nitrate, sponge palladium, palladium oxide, palladium chloride, palladium acetate, etc. 5: platinum containing category: waste platinum crucible, platinum carbon catalyst, platinum rhodium wire, platinum powder, sponge platinum, platinum water Platinum carbon 6: rhodium containing category: rhodium water, rhodium powder, rhodium chloride, rhodium carbon 7: ruthenium containing waste: ruthenium slurry, ruthenium powder, ruthenium slag, ruthenium wiping cloth, etc. 8: iridium block, iridium powder, iridium titanium alloy 9: copper containing gold plating waste: circuit board PCB, Ffc, fPC copper paper, copper powder, copper slag, copper mud, copper plating, etc