Method and system for removing and extracting zinc from galvanized steel sheet

By combining hydrochloric acid or sulfuric acid immersion with multi-effect evaporation, roasting, and magnetic separation, the problems of low zinc recovery efficiency, high energy consumption, and serious pollution have been solved, realizing the recovery of high-purity zinc metal and the recycling of resources, and meeting the low-carbon requirements of green electricity production.

CN122081671APending Publication Date: 2026-05-26TIANJIN UNIV +1
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Patent Information

Application Number
CN202610061376.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2025-12-16
Filing Date
2026-01-16
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing zinc recycling processes suffer from low recycling efficiency, high energy consumption, serious pollution, and difficulty in recycling resources. They are particularly difficult to adapt to the recycling needs of block-shaped waste galvanized steel sheets, and traditional processes are poorly compatible with green electricity.

Method used

The process involves immersing galvanized steel sheets in hydrochloric acid or sulfuric acid, followed by multi-effect evaporation, roasting, magnetic separation, and hydrogen reduction to form a closed-loop process. This achieves efficient separation and purification of zinc, iron, and aluminum, while utilizing the hydrogen and tail gas generated during acid washing for recycling, thus reducing energy consumption and pollution.

Benefits of technology

It achieves the recovery of high-purity zinc metal (greater than 99%), reduces energy consumption and resource waste, is compatible with green electricity production, meets low-carbon requirements, and achieves zero emissions and zero waste of resources.

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Abstract

The invention provides a method and system for removing and extracting zinc from a galvanized steel sheet, and belongs to the technical field of resource recycling. The zinc removing and extracting method for the galvanized steel sheet comprises the steps that the galvanized steel sheet is subjected to acid pickling soaking with inorganic acid, and a zinc salt-containing solution and hydrogen are obtained; the zinc salt-containing solution is subjected to multiple-effect evaporation, a concentrated solution and condensate of inorganic acid are obtained, and the condensate of the inorganic acid is reused for pickling and soaking; roasting the concentrated solution to obtain a solid oxide and tail gas containing hydrogen chloride or sulfur trioxide, and recycling the tail gas containing hydrogen chloride or sulfur trioxide for pickling and soaking; carrying out magnetic separation on the solid oxide to obtain a magnetic oxide and a non-magnetic oxide; and performing hydrogen reduction on the non-magnetic oxide by using hydrogen generated by pickling and soaking, and condensing and collecting to obtain zinc metal with the purity of more than 99%. Closed-loop utilization of hydrochloric acid or sulfuric acid and water resources is achieved, the zinc recovery rate is high, energy consumption is low, and economic and environmental benefits are achieved.
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