A method for producing 5n metal iron

By combining acidolysis and precipitation pyrolysis processes with the use of high-purity HCl and oxalic acid, the complexity and high cost of 5N metallic iron production in existing technologies have been solved, achieving high-purity and low-cost 5N metallic iron production.

CN122105049APending Publication Date: 2026-05-29TANGSHAN ESDANLU INTELLIGENT TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TANGSHAN ESDANLU INTELLIGENT TECH CO LTD
Filing Date
2026-03-04
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing technologies struggle to achieve high-purity, large-scale, and low-cost production of 5N metallic iron, as they suffer from complex processes, unstable purity, and high equipment investment and operating costs.

Method used

The process involves raw material preparation, acid decontamination, and precipitation pyrolysis. High-purity HCl and oxalic acid are used for acid decontamination, and high-purity iron-based flocculant and fiber bundle filter are used for impurity separation. Pyrolysis is carried out in an electrically heated rotary kiln, and the HCl solution and CO2 generated by acid decontamination are recycled.

Benefits of technology

It achieves high purity of 5N grade metallic iron (purity ≥99.999%), with key impurity content ≤10ppm, reducing energy consumption and production costs, improving the recycling rate of process resources, simplifying the process, and reducing the difficulty of operation.

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Abstract

The application relates to the technical field of ultra-pure metal processing, and particularly discloses a production method of 5N metal iron, which comprises the following steps: raw material preparation, 3N-grade metal iron impurity removal, 5N iron powder preparation by precipitation and pyrogenation, and the like. The production method of the application omits the multiple electrolysis, vacuum annealing, electron beam smelting and other high-complexity links necessary in the traditional process, the process connection is compact, the operation difficulty is reduced, the high-purity iron-based flocculant is used to adsorb the colloids, silicon residues and other trace impurities in the solution in a targeted manner, the fiber bundle filter is combined, the residual impurities in the solution are efficiently and deeply removed, the HCl solution regenerated by the precipitation reaction of the application can be recycled after being purified and returned to the acidolysis process, the consumption of fresh high-purity hydrochloric acid is significantly reduced, the unreacted iron residues rich in impurities after acidolysis can be directly reused as 3N-grade industrial iron raw materials, and the core pyrogenation process adopts an electric heating rotary kiln, so that, compared with the traditional vacuum distillation method or electron beam smelting, the energy consumption is reduced, and the production cost is greatly reduced.
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