title: A soft-solution process for recovering rare metals from metal/alloy-wastes by grinding and washing with water.
abstract: We have developed a novel process for recovering metals from alloy-wastes by using a mechanochemical (MC) reaction. The process consists of co-grinding both alloy and polyvinyl chloride (PVC) samples, followed by washing with water and filtration. The co-grinding of the wastes causes a solid-state MC reaction to form metal chlorides and hydrocarbon in the product. The former products are soluble in water, so they can be recovered from the wastes by washing with water, followed by filtration. The PVC waste plays a significant role as a chlorine source in the MC reaction. After filtration, the solid residue can be used as a fuel, due to the absence of chlorine in the product, and the filtrate is subjected to hydrometallurgical process to extract metals from the solution.
authors.affiliation: IMRAM, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai 980-8577, Japan.
authors.forename: Qiwu
authors.initials: Q
authors.lastname: Zhang
authors.forename: Shu
authors.initials: S
authors.lastname: Saeki
authors.forename: Yasumitsu
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Junya
authors.initials: J
authors.lastname: Kano
authors.forename: Fumio
authors.initials: F
authors.lastname: Saito
mesh_terms: D000497:Alloys / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry; D008670:Metals / Q000302:isolation & purification*; D010087:Oxides / Q000737:chemistry*; D011143:Polyvinyl Chloride / Q000737:chemistry*; D014867:Water
chemical_list: D000497:Alloys; D008670:Metals; D010087:Oxides; C491691:lithium cobalt oxide; C518795:misch metal; D014867:Water; D003035:Cobalt; D011143:Polyvinyl Chloride