Method for resourceful treatment of tailings wastewater and simultaneous recovery of valuable metals

By using photovoltaic cells and photoelectric circuit systems in a transparent reactor, and utilizing carbon felt and graphite-phase carbon nitride materials with special loading layers, the problems of high cost and low efficiency in mine tailings wastewater treatment have been solved, achieving clean and efficient removal of inorganic nitrogen and recovery of valuable metals.

CN120247155BActive Publication Date: 2026-07-03JIANGXI ACAD OF ECO-ENVIRONMENTAL SCI & PLANNING +1
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Patent Information

Application Number
CN202510262848.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-03-06
Publication Date
2026-07-03
Estimated Expiration
2045-03-06

AI Technical Summary

Technical Problem

Existing technologies for treating mine tailings wastewater suffer from high treatment costs, high energy consumption, ineffective treatment of metal ions, and long and inefficient processes, particularly in the removal of inorganic nitrogen and the recovery of valuable metals.

Method used

The system employs a photovoltaic cell and photoelectrolysis circuit system with a built-in working electrode in a transparent reactor. The photovoltaic cell reaction oxidizes ammonia nitrogen into nitrogen gas and recovers some manganese metal. The photoelectrolysis reaction is then switched to reduce nitrate nitrogen into nitrogen gas and further recover manganese metal. The porous carbon felt with a special support layer and graphite-phase carbon nitride material are used as working electrodes to achieve clean and efficient resource recovery.

Benefits of technology

It achieves clean, efficient, and short-process deep treatment of mine tailings wastewater, simultaneously recovering valuable metals, reducing energy consumption and improving treatment efficiency, and meeting environmental and economic requirements.

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Abstract

This invention provides a method for the resource-based treatment of tailings wastewater and the simultaneous recovery of valuable metals, belonging to the field of mine wastewater treatment technology. The method includes: constructing a reaction system, which comprises a transparent reactor with a built-in working electrode, a power-free photovoltaic cell circuit system, a powered photoelectric electrolysis circuit system, and a light source; the photovoltaic cell circuit system and the photoelectric electrolysis circuit system are switched in parallel; the tailings wastewater is introduced into the transparent reactor and sealed; the light source is turned on, and only the photovoltaic cell circuit system is activated, to oxidize ammonia nitrogen into nitrogen gas and nitrate nitrogen, and recover some manganese metal; the light source is turned on, and only the photoelectric electrolysis circuit system is activated, to reduce manganese ions to recover manganese metal and reduce nitrate nitrogen into nitrogen gas. This invention provides a clean and efficient method for simultaneously oxidizing ammonia nitrogen in mine tailings wastewater and recovering valuable metals from the tailings wastewater; it utilizes an interconvertible photovoltaic cell reaction system and a photoelectric electrolysis reaction system to efficiently degrade ammonia-containing pollutants in tailings wastewater and recover manganese metal.
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