Zinc Recovery from Spent Chemical Sorbent by Dry Chlorination and Electrodeposition from Chloride Solutions
Spent catalysts, chemical traps and sorbents are types of solid wastes generated worldwide, which contain potentially valuable or environmentally hazardous materials that need to be recovered before final deposition. Chlorination and electrolysis are unit processes applied in extractive metallurgy f...
| Authors: | ; ; ; |
|---|---|
| Format: | Article |
| Status: | Published version |
| Publication date: | 2017 |
| Country: | Argentina |
| Institution: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repository: | CONICET Digital (CONICET) |
| Language: | English |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/63498 |
| Online Access: | http://hdl.handle.net/11336/63498 |
| Access Level: | Open access |
| Keyword: | CATALYST CHLORINATION WASTE TREATMENT ELECTROCHEMISTRY ZINC https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
| _version_ | 1878403477303984128 |
|---|---|
| author | de Micco, Georgina |
| author2 | Pomiro, Fernando Grau, Javier Mario Bohe, Ana Ester |
| author2_role | author author author |
| author_browse | Bohe, Ana Ester Grau, Javier Mario Pomiro, Fernando de Micco, Georgina |
| author_facet | de Micco, Georgina Pomiro, Fernando Grau, Javier Mario Bohe, Ana Ester |
| author_role | author |
| collection | CONICET Digital (CONICET) |
| description | Spent catalysts, chemical traps and sorbents are types of solid wastes generated worldwide, which contain potentially valuable or environmentally hazardous materials that need to be recovered before final deposition. Chlorination and electrolysis are unit processes applied in extractive metallurgy for metal extraction from poly-metallic or low-grade ores. The primary aim of this study was to assess the possibility of applying pyrometallurgy (chlorination) and electrometallurgy to spent chemical sorbents used as sulfur traps and to recover zinc. The spent sorbents may include zinc in different phases: ZnO, ZnS and Zn0.65Al 0.35(OH)2(CO3)0.167(H2O)0.5. It was found that 96.8% of the zinc can be separated by dry chlorination at 475ºC with pure chlorine. Before chlorination, addition of CaCO3 (17 wt.%) is necessary to prevent formation of ZnSO4. The zinc chloride obtained is dissolved in water and electrolyzed to generate chlorine which can be recycled to the chlorination reactor, and metallic zinc as a non-adherent layer on the cathode. The electrolyte composition is 65 g.L−1 ZnCl2 with 20 g.L−1 H3BO3 and 200 g.L−1 KCl. It is possible to recover pure zinc (99.9 wt.%) from chemical sorbents with the methodology proposed. These results are important for the development of new and more efficient recovery strategies to prevent environmental damage and obtain valuable elements from wastes |
| eu_rights_str_mv | openAccess |
| format | article |
| id | AR_85d0eaec48b283febf8cdc10a8fb697f |
| identifier_str_mv | de Micco, Georgina; Pomiro, Fernando; Grau, Javier Mario; Bohe, Ana Ester; Zinc Recovery from Spent Chemical Sorbent by Dry Chlorination and Electrodeposition from Chloride Solutions; SCIENCEDOMAIN international; International Research Journal of Pure and Applied Chemistry; 14; 3; 1-2017; 1-13 2231-3443 CONICET Digital CONICET |
| institution | Consejo Nacional de Investigaciones Científicas y Técnicas |
| instname_str | Consejo Nacional de Investigaciones Científicas y Técnicas |
| language | eng |
| network_acronym_str | AR |
| network_name_str | Argentina |
| oai_identifier_str | oai:ri.conicet.gov.ar:11336/63498 |
| publishDate | 2017 |
| publishDateSort | 2017 |
| publisher | SCIENCEDOMAIN international |
| publisherStr | SCIENCEDOMAIN international |
| reponame_str | CONICET Digital (CONICET) |
| spelling | Zinc Recovery from Spent Chemical Sorbent by Dry Chlorination and Electrodeposition from Chloride Solutions de Micco, Georgina Pomiro, Fernando Grau, Javier Mario Bohe, Ana Ester CATALYST CHLORINATION WASTE TREATMENT ELECTROCHEMISTRY ZINC https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 Spent catalysts, chemical traps and sorbents are types of solid wastes generated worldwide, which contain potentially valuable or environmentally hazardous materials that need to be recovered before final deposition. Chlorination and electrolysis are unit processes applied in extractive metallurgy for metal extraction from poly-metallic or low-grade ores. The primary aim of this study was to assess the possibility of applying pyrometallurgy (chlorination) and electrometallurgy to spent chemical sorbents used as sulfur traps and to recover zinc. The spent sorbents may include zinc in different phases: ZnO, ZnS and Zn0.65Al 0.35(OH)2(CO3)0.167(H2O)0.5. It was found that 96.8% of the zinc can be separated by dry chlorination at 475ºC with pure chlorine. Before chlorination, addition of CaCO3 (17 wt.%) is necessary to prevent formation of ZnSO4. The zinc chloride obtained is dissolved in water and electrolyzed to generate chlorine which can be recycled to the chlorination reactor, and metallic zinc as a non-adherent layer on the cathode. The electrolyte composition is 65 g.L−1 ZnCl2 with 20 g.L−1 H3BO3 and 200 g.L−1 KCl. It is possible to recover pure zinc (99.9 wt.%) from chemical sorbents with the methodology proposed. These results are important for the development of new and more efficient recovery strategies to prevent environmental damage and obtain valuable elements from wastes Fil: de Micco, Georgina. Comision Nacional de Energía Atómica. Gerencia de Área Investigaciones y Aplicaciones no Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Física de Metales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Pomiro, Fernando. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes. Gerencia de Investigación y Aplicaciones; Argentina Fil: Grau, Javier Mario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina Fil: Bohe, Ana Ester. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica; Argentina SCIENCEDOMAIN international http://hdl.handle.net/11336/63498 de Micco, Georgina; Pomiro, Fernando; Grau, Javier Mario; Bohe, Ana Ester; Zinc Recovery from Spent Chemical Sorbent by Dry Chlorination and Electrodeposition from Chloride Solutions; SCIENCEDOMAIN international; International Research Journal of Pure and Applied Chemistry; 14; 3; 1-2017; 1-13 2231-3443 CONICET Digital CONICET |
| spellingShingle | Zinc Recovery from Spent Chemical Sorbent by Dry Chlorination and Electrodeposition from Chloride Solutions de Micco, Georgina CATALYST CHLORINATION WASTE TREATMENT ELECTROCHEMISTRY ZINC https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
| status_str | publishedVersion |
| title | Zinc Recovery from Spent Chemical Sorbent by Dry Chlorination and Electrodeposition from Chloride Solutions |
| title_full | Zinc Recovery from Spent Chemical Sorbent by Dry Chlorination and Electrodeposition from Chloride Solutions |
| title_fullStr | Zinc Recovery from Spent Chemical Sorbent by Dry Chlorination and Electrodeposition from Chloride Solutions |
| title_full_unstemmed | Zinc Recovery from Spent Chemical Sorbent by Dry Chlorination and Electrodeposition from Chloride Solutions |
| title_short | Zinc Recovery from Spent Chemical Sorbent by Dry Chlorination and Electrodeposition from Chloride Solutions |
| title_sort | Zinc Recovery from Spent Chemical Sorbent by Dry Chlorination and Electrodeposition from Chloride Solutions |
| topic | CATALYST CHLORINATION WASTE TREATMENT ELECTROCHEMISTRY ZINC https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
| topic_facet | CATALYST CHLORINATION WASTE TREATMENT ELECTROCHEMISTRY ZINC https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
| url | http://hdl.handle.net/11336/63498 |