Settling of Copper Phases in Lime Modified Iron Silicate Slag
Copper in discarded slag decreases the profits and copper recovery during the pyrometallurgical extraction processes. The copper losses to slag can be reduced by using a settling furnace, in which mechanically entrained copper droplets separate from the slag under the action of gravity. The settling...
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| Format: | Article |
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MDPI AG
2021-07-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/7/1098 |
| _version_ | 1797526584364630016 |
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| author | Jenny Isaksson Tommy Vikström Andreas Lennartsson Anton Andersson Caisa Samuelsson |
| author_facet | Jenny Isaksson Tommy Vikström Andreas Lennartsson Anton Andersson Caisa Samuelsson |
| author_sort | Jenny Isaksson |
| collection | DOAJ |
| description | Copper in discarded slag decreases the profits and copper recovery during the pyrometallurgical extraction processes. The copper losses to slag can be reduced by using a settling furnace, in which mechanically entrained copper droplets separate from the slag under the action of gravity. The settling rate of entrained droplets can be increased by modifying the slag composition and, thus, the slag properties, which are known to influence the settling rate. The knowledge of industrial CaO slag modification in a reduced iron silicate slag with a Fe/SiO<sub>2</sub> ratio close to unity is limited. An industrial trial was thus conducted in an electric settling furnace, where the slag had been pretreated in a fuming furnace, to investigate the effect of CaO slag modification on the final slag copper content. Slag samples were collected from the ingoing and outgoing slag and from within the furnace of batches modified with CaO up to about 16 wt %. The trial was evaluated by comparing the final slag copper content and the copper recovery in the settling furnace. The results indicate that the settling becomes more efficient with the CaO modification as the final slag copper content decreased with increasing CaO content. |
| first_indexed | 2024-03-10T09:32:20Z |
| format | Article |
| id | doaj.art-58a750e430184377be92ba2b82812dcc |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T09:32:20Z |
| publishDate | 2021-07-01 |
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| series | Metals |
| spelling | doaj.art-58a750e430184377be92ba2b82812dcc2023-11-22T04:23:47ZengMDPI AGMetals2075-47012021-07-01117109810.3390/met11071098Settling of Copper Phases in Lime Modified Iron Silicate SlagJenny Isaksson0Tommy Vikström1Andreas Lennartsson2Anton Andersson3Caisa Samuelsson4Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, 971 87 Luleå, SwedenProcess Development, Boliden Rönnskär, Rönnskärsverken, 932 81 Skelleftehamn, SwedenDepartment of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, 971 87 Luleå, SwedenDepartment of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, 971 87 Luleå, SwedenDepartment of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, 971 87 Luleå, SwedenCopper in discarded slag decreases the profits and copper recovery during the pyrometallurgical extraction processes. The copper losses to slag can be reduced by using a settling furnace, in which mechanically entrained copper droplets separate from the slag under the action of gravity. The settling rate of entrained droplets can be increased by modifying the slag composition and, thus, the slag properties, which are known to influence the settling rate. The knowledge of industrial CaO slag modification in a reduced iron silicate slag with a Fe/SiO<sub>2</sub> ratio close to unity is limited. An industrial trial was thus conducted in an electric settling furnace, where the slag had been pretreated in a fuming furnace, to investigate the effect of CaO slag modification on the final slag copper content. Slag samples were collected from the ingoing and outgoing slag and from within the furnace of batches modified with CaO up to about 16 wt %. The trial was evaluated by comparing the final slag copper content and the copper recovery in the settling furnace. The results indicate that the settling becomes more efficient with the CaO modification as the final slag copper content decreased with increasing CaO content.https://www.mdpi.com/2075-4701/11/7/1098slag modificationelectric settling furnacecopper lossesCaOindustrial trialslag properties |
| spellingShingle | Jenny Isaksson Tommy Vikström Andreas Lennartsson Anton Andersson Caisa Samuelsson Settling of Copper Phases in Lime Modified Iron Silicate Slag Metals slag modification electric settling furnace copper losses CaO industrial trial slag properties |
| title | Settling of Copper Phases in Lime Modified Iron Silicate Slag |
| title_full | Settling of Copper Phases in Lime Modified Iron Silicate Slag |
| title_fullStr | Settling of Copper Phases in Lime Modified Iron Silicate Slag |
| title_full_unstemmed | Settling of Copper Phases in Lime Modified Iron Silicate Slag |
| title_short | Settling of Copper Phases in Lime Modified Iron Silicate Slag |
| title_sort | settling of copper phases in lime modified iron silicate slag |
| topic | slag modification electric settling furnace copper losses CaO industrial trial slag properties |
| url | https://www.mdpi.com/2075-4701/11/7/1098 |
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