Method for preparing metal iron from copper slag

A technology of metallic iron and copper slag, which is applied in the field of preparing metallic iron from copper slag, can solve the problems of unsatisfactory use requirements, high content of Cu, S and As, etc., and achieve the effects of improving utilization rate, reducing activity, and improving economic value

Active Publication Date: 2019-01-01
钢研晟华科技股份有限公司
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  • Application Information

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Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a method for preparing metallic iron from copper slag, in order to solve the problem that the existing hot metal prepared from copper slag has high content of Cu, S and As and cannot meet the requirements of use

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  • Method for preparing metal iron from copper slag

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Embodiment 1

[0053] Copper slag and FeS, Na 2 CO 3 Mix evenly, the ratio of the amount of FeS added to the mass of copper slag is 0.4, 0.6, 0.8, 1 respectively, and the ratio of the amount of sodium carbonate added to the mass of copper slag is 1. The mixed material is kept and roasted at 1400°C for 2 hours to separate the two phases of slag and matte (that is, melt). The contents of Cu and O in the sulfonium phase were determined by chemical analysis, and the enrichment rates of FeO and Cu in the sulfonium phase were determined by calculation.

[0054] The experimental results show that when the ratio of the amount of FeS added to the mass of copper slag is 0.4, 0.6, 0.8, and 1, the enrichment rates of Cu in the matte phase are 91%, 95%, 97%, and 98%, respectively, and FeO in The enrichment rates of the matte phase are 78%, 86%, 89%, and 91%, respectively. Therefore, the ratio of the amount of FeS added to the mass of copper slag is preferably 0.6-0.8.

Embodiment 2

[0056] Copper slag and FeS, Na 2 CO 3 Mix evenly, the ratio of the amount of FeS added to the amount of copper slag is 0.8, the ratio of the amount of sodium carbonate added to the mass of copper slag is 0.6, 0.8, 1 hour, 1400 ° C for 2 hours of heat preservation and roasting for slag and matte two-phase separation ( i.e. melting). The enrichment ratios of FeO and Cu in the sulfonium phase were determined by the same method as above.

[0057] The experimental results show that when the mass ratio of sodium carbonate to copper slag is 0.6, 0.8, and 1, the enrichment rate of Cu in the matte phase remains at 95%-97%, which has little effect on the enrichment of Cu in the matte phase ; The enrichment rates of FeO in the sulfonium phase were 81%, 86%, and 89%, respectively. Therefore, increasing the amount of sodium carbonate added was beneficial to the dissolution and enrichment of FeO in the sulfonium phase.

Embodiment 3

[0059] Copper slag and FeS, Na 2 CO 3 Mix evenly, the mass ratio of FeS addition to copper slag is 0.8, and the addition of sodium carbonate to copper slag mass ratio is 1. The mixture was roasted at 1250°C, 1300°C, and 1400°C for 2 hours to separate the two phases of slag and matte (melting). The enrichment ratios of FeO and Cu in the sulfonium phase were determined by the same method as above.

[0060] The experimental results show that when the calcination temperatures are 1250°C, 1300°C, and 1400°C, the enrichment rates of Cu in the sulfonium phase are 72%, 91%, and 97%, respectively; the enrichment rates of FeO in the sulfonium phase are 63%, 74%, 89%. It can be seen that the calcination temperature has a great influence on the dissolution and enrichment of FeO and Cu in the matte phase, and the calcination temperature should be controlled above 1300 °C.

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Abstract

The invention relates to a method for preparing metal iron from copper slag, belongs to the technical field of comprehensive utilization of metallurgical resources and solves the problems of the priorart that the molten iron prepared from copper slag has relatively high content of Cu, S and As and cannot meet the using requirements. The method for preparing metal iron from copper slag comprises the following steps: (A), performing alkaline-process and vulcanizing separation of the copper slag to obtain a sulfonium phase and a slag phase, enriching copper and FeO in the sulfonium phase, and enriching As in the slag phase; (B), performing smelting reduction separation of the sulfonium phase to realize separation of iron and sulfonium phase to obtain molten iron of metal while keeping the copper in the sulfonium phase. According to the method provided by the invention, the prepared molten iron contains less than 0.1% of copper, less than 0.3% of sulfur and less than 0.03% of As and meetsthe requirements on the molten iron for steelmaking.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of metallurgical resources, in particular to a method for preparing metallic iron from copper slag. Background technique [0002] Copper matte smelting is currently the main metallurgical method for copper. The smelting slag after separation of the matte phase contains about 30% to 40% iron and 0.5% to 2% copper. Efficient use of copper metallurgical slag can be achieved in terms of resource utilization and environmental protection. angles are significant. [0003] Research on the recycling of copper slag has been actively carried out. A large number of research results have confirmed that the stubborn problem of copper slag utilization lies in the unqualified quality of metallic iron, in which the contents of S, As, and Cu are all much higher than the qualified content level of iron. The application range of iron is narrow and the added value is low, resulting in the utilizatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B11/00C22B7/04C22B15/00C22B1/02
CPCC21B11/00C22B1/02C22B7/001C22B7/04C22B15/0054Y02P10/20
Inventor 张俊
Owner 钢研晟华科技股份有限公司
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