Coupling method for removing ultralow-concentration mercury in metal mine wastewater

By combining chemical precipitation, flocculation precipitation, and sulfur-loaded activated carbon adsorption, the problem of removing ultra-low concentration mercury from metal mine wastewater has been solved, achieving efficient and stable mercury removal and meeting surface water quality standards.

CN122277018APending Publication Date: 2026-06-26CHINA COAL TECH & ENG GRP HANGZHOU ENVIRONMENTAL PROTECTION INST +1
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Patent Information

Application Number
CN202610495806.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-15
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing technologies are ineffective at removing ultra-low concentrations of mercury from metal mine wastewater, especially for organic mercury, and traditional methods suffer from high costs, low efficiency, and poor stability.

Method used

A combined process of coupled chemical precipitation, flocculation precipitation, and sulfur-loaded activated carbon adsorption was adopted. Through the synergistic effect of stannous chloride and amorphous ferrous sulfide nanoparticles, combined with hydrophobically modified cationic polyacrylamide flocculant and improved sulfur-loaded activated carbon, the specific removal of mercury was achieved.

Benefits of technology

It achieves efficient removal of mercury from wastewater in metal mines, with effluent mercury concentration below 0.05 μg/L, meeting the Class II surface water standard, and overcoming the limitations of traditional methods in the removal of ultra-low concentration mercury.

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Abstract

The invention belongs to the field of metal mine wastewater treatment, and provides a coupling method for removing ultralow-concentration mercury in metal mine wastewater. A combined process of coupling chemical precipitation, flocculent precipitation and sulfur-loaded activated carbon adsorption is adopted, stannous chloride is added firstly to generate hydroxide gel, the hydroxide gel and amorphous FeS nanoparticles cooperate with chemical precipitation, hydrophobic modified cationic polyacrylamide is used for flocculent precipitation, and finally improved sulfur-loaded activated carbon is used for deep adsorption. The treatment process has a specific removal effect on mercury ions, the mercury in the final effluent can meet the earth surface second-class water standard, the effluent is stable, and the problem of loss of sulfur in common sulfur-loaded activated carbon is also solved.
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