Method for separating metal and method for producing metal material

A multi-step process using pH adjustment and solid-liquid separation effectively recovers zinc and lead from iron dust, addressing inefficiencies in existing methods and enabling their recycling as valuable raw materials.

JP2025012118AActive Publication Date: 2025-01-24JFE STEEL CORP
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Patent Information

Application Number
JP2023114708
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-07-12
Publication Date
2025-01-24
Estimated Expiration
2043-07-12

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Abstract

To provide a method for separating zinc, which can efficiently separate zinc from iron-making dust at a high recovery rate.SOLUTION: The method for separating the metal includes: a lead / zinc leaching step of adding one or both of hydrochloric acid and nitric acid to iron-making dust to adjust the pH to 1.0 to 6.0, and thereby leaching lead and zinc; a lead precipitation step of adding sulfuric acid to a treated liquid after the lead / zinc leaching step to adjust the pH to 1.0 or higher, and thereby precipitating lead; a first solid-liquid separation step of solid-liquid separating a treated liquid after the lead precipitation step; an iron precipitation step of adding a first alkali and an oxidizing agent to a treated liquid after the first solid-liquid separation step, and thereby precipitating iron; a second solid-liquid separation step of solid-liquid separating a treated liquid after the iron precipitation step; a zinc precipitation step of adding a second alkali to a treated liquid after the second solid-liquid separation step, and thereby precipitating zinc; and a third solid-liquid separation step of solid-liquid separating a treated liquid after the zinc precipitation step.SELECTED DRAWING: Figure 1
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Citation Information

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