PROCESSING OF A METAL CONCENTRATE FROM GROUND WASTE PRINTED CIRCUIT BOARDS IN ACIDIC MEDIA USING HYDROGEN PEROXIDE AS OXIDANT
The recovery of precious and base metals of a metal concentrate from ground waste printed circuit boards (PCBs) is described in detail. Samples were treated with NaOHaq. to remove the soldering mask. Experiments were performed in acidic medium (HF, H2SO4, CH3COOH or H3PO4) using H2O2 as oxidant. Bas...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Química
2020-08-01
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| Series: | Química Nova |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422020000700914&tlng=en |
| _version_ | 1818974854851854336 |
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| author | Calvin Sampaio Moreira da Silva Guido Tande Crespo Zeba Christiano Mota Rodrigues da Rocha Pedro Rosário Gismonti Júlio Carlos Afonso Rubens Souza da Silva Cláudio Augusto Vianna José Luiz Mantovano |
| author_facet | Calvin Sampaio Moreira da Silva Guido Tande Crespo Zeba Christiano Mota Rodrigues da Rocha Pedro Rosário Gismonti Júlio Carlos Afonso Rubens Souza da Silva Cláudio Augusto Vianna José Luiz Mantovano |
| author_sort | Calvin Sampaio Moreira da Silva |
| collection | DOAJ |
| description | The recovery of precious and base metals of a metal concentrate from ground waste printed circuit boards (PCBs) is described in detail. Samples were treated with NaOHaq. to remove the soldering mask. Experiments were performed in acidic medium (HF, H2SO4, CH3COOH or H3PO4) using H2O2 as oxidant. Base metals were leached in high yields (>99 wt.%) at ~40 ºC after ~1 h (HF), ~2 h (H2SO4), ~4 h (H3PO4) and ~5 h (CH3COOH). Lead precipitated in the presence of H2SO4 and HF. Precious metals were not oxidized. Ceramic/fiberglass components were dissolved in the presence of HF. Silver, palladium and gold were recovered from the insoluble solid, in this order, by a sequential oxidative treatment in aqueous medium. Recovery of leached elements was possible by a combination of solvent extraction and precipitation. The choice of the extractant and the precipitant were essential to recover them with high yields. The leachates from H3PO4 + H2O2 experiments could not be processed above pH 2.5. Leaching of waste PCBs in the presence of a weak organic acid is possible but a multistage separation scheme for elements recovery is unavoidable as PCBs is a complex material in terms of composition. |
| first_indexed | 2024-12-20T15:46:41Z |
| format | Article |
| id | doaj.art-c7162699b636479b866b8a7be50184f6 |
| institution | Directory Open Access Journal |
| issn | 1678-7064 |
| language | English |
| last_indexed | 2024-12-20T15:46:41Z |
| publishDate | 2020-08-01 |
| publisher | Sociedade Brasileira de Química |
| record_format | Article |
| series | Química Nova |
| spelling | doaj.art-c7162699b636479b866b8a7be50184f62022-12-21T19:34:54ZengSociedade Brasileira de QuímicaQuímica Nova1678-70642020-08-0143791492210.21577/0100-4042.20170575PROCESSING OF A METAL CONCENTRATE FROM GROUND WASTE PRINTED CIRCUIT BOARDS IN ACIDIC MEDIA USING HYDROGEN PEROXIDE AS OXIDANTCalvin Sampaio Moreira da SilvaGuido Tande Crespo ZebaChristiano Mota Rodrigues da RochaPedro Rosário GismontiJúlio Carlos Afonsohttps://orcid.org/0000-0003-0621-4125Rubens Souza da SilvaCláudio Augusto ViannaJosé Luiz MantovanoThe recovery of precious and base metals of a metal concentrate from ground waste printed circuit boards (PCBs) is described in detail. Samples were treated with NaOHaq. to remove the soldering mask. Experiments were performed in acidic medium (HF, H2SO4, CH3COOH or H3PO4) using H2O2 as oxidant. Base metals were leached in high yields (>99 wt.%) at ~40 ºC after ~1 h (HF), ~2 h (H2SO4), ~4 h (H3PO4) and ~5 h (CH3COOH). Lead precipitated in the presence of H2SO4 and HF. Precious metals were not oxidized. Ceramic/fiberglass components were dissolved in the presence of HF. Silver, palladium and gold were recovered from the insoluble solid, in this order, by a sequential oxidative treatment in aqueous medium. Recovery of leached elements was possible by a combination of solvent extraction and precipitation. The choice of the extractant and the precipitant were essential to recover them with high yields. The leachates from H3PO4 + H2O2 experiments could not be processed above pH 2.5. Leaching of waste PCBs in the presence of a weak organic acid is possible but a multistage separation scheme for elements recovery is unavoidable as PCBs is a complex material in terms of composition.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422020000700914&tlng=enPCBsprecious metalsacidic leachingmetals recovery |
| spellingShingle | Calvin Sampaio Moreira da Silva Guido Tande Crespo Zeba Christiano Mota Rodrigues da Rocha Pedro Rosário Gismonti Júlio Carlos Afonso Rubens Souza da Silva Cláudio Augusto Vianna José Luiz Mantovano PROCESSING OF A METAL CONCENTRATE FROM GROUND WASTE PRINTED CIRCUIT BOARDS IN ACIDIC MEDIA USING HYDROGEN PEROXIDE AS OXIDANT Química Nova PCBs precious metals acidic leaching metals recovery |
| title | PROCESSING OF A METAL CONCENTRATE FROM GROUND WASTE PRINTED CIRCUIT BOARDS IN ACIDIC MEDIA USING HYDROGEN PEROXIDE AS OXIDANT |
| title_full | PROCESSING OF A METAL CONCENTRATE FROM GROUND WASTE PRINTED CIRCUIT BOARDS IN ACIDIC MEDIA USING HYDROGEN PEROXIDE AS OXIDANT |
| title_fullStr | PROCESSING OF A METAL CONCENTRATE FROM GROUND WASTE PRINTED CIRCUIT BOARDS IN ACIDIC MEDIA USING HYDROGEN PEROXIDE AS OXIDANT |
| title_full_unstemmed | PROCESSING OF A METAL CONCENTRATE FROM GROUND WASTE PRINTED CIRCUIT BOARDS IN ACIDIC MEDIA USING HYDROGEN PEROXIDE AS OXIDANT |
| title_short | PROCESSING OF A METAL CONCENTRATE FROM GROUND WASTE PRINTED CIRCUIT BOARDS IN ACIDIC MEDIA USING HYDROGEN PEROXIDE AS OXIDANT |
| title_sort | processing of a metal concentrate from ground waste printed circuit boards in acidic media using hydrogen peroxide as oxidant |
| topic | PCBs precious metals acidic leaching metals recovery |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422020000700914&tlng=en |
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