Study on synergistic treatment of cyanidation gold extraction wastewater by micro-electrolysis-flocculation precipitation

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Abstract Microelectrolysis-flocculation and sedimentation technology was used to treat high-concentration cyanide gold extraction wastewater. The effects of voltage, electrolysis time, electrode spacing, temperature, and polymerization ferric chloride (PFC) addition on the removal rate of CN_T, CN^-, Cu, and Zn ions and its process reaction mechanism were mainly studied. The results show that at room temperature, with titanium plate as cathode and two graphite plates as anodes, this electrolysis system(one cathode and two anodes) was used to treat cyanide wastewater. The removal rates of CN_T, CN^-, Cu, and Zn ions in the wastewater can reach 97.29%, 97.83%, 99.36% and 98.74% respectively when the PFC dosage of 750 mg·L^-1, the voltage of 4.5 V, the time of 3 h and the distance between the plates of 10 mm. And the treated wastewater can be directly returned to the leaching system. Under an electric field, the original Cl^- in the wastewater and the Cl^- generated by the dissociation of the PFC migrate directionally to the anode for oxidation reaction. The free cyanide and metal cyanide complex ions migrating near the anode are oxidized to N₂ and CO₂ indirectly by generated Cl₂ and ClO^-. Some of the heavy metal ions released by the metal cyanide complex ions are electrodeposited at the cathode. Part of Cu²⁺ will be removed in the form of Cu(OH)₂ precipitation, Zn²⁺ and Cu(CN)^2-₃ co-precipitate will be removed in the form of Zn(CN)₂ and CuCN precipitation. Meanwhile, micro-electrolysis-flocculation and PFC hydrolysis promote each other. The hydroxides and polynuclear hydroxyl complexes produced by the hydrolysis contribute to the rapid sedimentation of the precipitate through adsorption and flocculation. The technology can achieve the purpose of rapid and efficient removal of cyanide and comprehensive utilization of valuable metals, providing a new way for the harmless treatment and comprehensive utilization of cyanidation gold extraction wastewater.

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	ZHOU Jiameng
	SONG Yonghui
	ZHANG Panpan
	WANG Yifan
	LIAO Long

Keywords： micro-electrolysis-flocculation precipitation PFC cyanide wastewater metal cyanide complex ion

Received 2022-12-04;

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ZHOU Jiameng, SONG Yonghui, ZHANG Panpan, WANG Yifan, LIAO Long.Study on synergistic treatment of cyanidation gold extraction wastewater by micro-electrolysis-flocculation precipitation[J] Chemcial Industry and Engineering, 2024,V41(3): 98-105

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