https://scholars.lib.ntu.edu.tw/handle/123456789/393670
Title: | Selective leaching process for the recovery of copper and zinc oxide from copper-containing dust | Authors: | Wu, J.-Y. Chang, F.-C. Wang, H.P. Tsai, M.-J. Ko, C.-H. CHUN-HAN KO FENG-CHENG CHANG MING-JER TSAI |
Issue Date: | 2015 | Journal Volume: | 36 | Journal Issue: | 23 | Start page/Pages: | 2952-2958 | Source: | Environmental Technology | Abstract: | The purpose of this study was to develop a resource recovery procedure for recovering copper and zinc from dust produced by copper smelting furnaces during the manufacturing of copper-alloy wires. The concentrations of copper in copper-containing dust do not meet the regulation standards defined by the Taiwan Environmental Protection Administration; therefore, such waste is classified as hazardous. In this study, the percentages of zinc and copper in the dust samples were approximately 38.4% and 2.6%, respectively. To reduce environmental damage and recover metal resources for industrial reuse, acid leaching was used to recover metals from these inorganic wastes. In the first stage, 2 N of sulphuric acid was used to leach the dust, with pH values controlled at 2.0-3.0, and a solid-to-liquid ratio of 1:10. The results indicated that zinc extraction efficiency was higher than 95%. A selective acid leaching process was then used to recover the copper content of the residue after filtration. In the second stage, an additional 1 N of sulphuric acid was added to the suspension in the selective leaching process, and the pH value was controlled at 1.5-2.0. The reagent sodium hydroxide (2 N) was used as leachate at a pH greater than 7. A zinc hydroxide compound formed during the process and was recovered after drying. The yields for zinc and copper were 86.9-93.5% and 97.0-98.9%, respectively. © 2014 Taylor & Francis. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-84946474825&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/393670 |
DOI: | 10.1080/09593330.2014.960479 | SDG/Keyword: | Copper; Copper alloys; Copper oxides; Dealloying; Dust; Environmental regulations; Hydrometallurgy; II-VI semiconductors; Leaching; Metallurgical furnaces; pH; Recovery; Sodium hydroxide; Sulfuric acid; Suspensions (fluids); Zinc oxide; Zinc smelting; Environmental damage; Industrial reuse; Resource recovery; Selective acid leaching; Selective leaching; Smelting furnaces; Solid-to-liquid ratio; Taiwan environmental protection administrations; Copper smelting; cadmium; calcium ion; copper; ferric ion; lead; mercury; sulfuric acid; zinc derivative; zinc ion; zinc oxide; copper; dust; industrial waste; nitric acid; sodium hydroxide; zinc oxide; alloy; concentration (composition); copper; dust; environmental protection; extraction method; filtration; hazardous waste; inorganic compound; leaching; pH; recovery; smelting; sulfuric acid; Article; controlled study; dust; industrial waste; leaching; pH; recycling; analysis; chemistry; dust; metallurgy; procedures; Taiwan; Copper; Dust; Hydrogen-Ion Concentration; Industrial Waste; Metallurgy; Nitric Acid; Recycling; Sodium Hydroxide; Sulfuric Acids; Zinc Oxide |
Appears in Collections: | 森林環境暨資源學系 |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.