利用矿浆电解技术处理氰化尾渣

氰化提金所产生的氰化尾渣会带来环境污染隐患,而氰化尾渣的无害化处理是黄金冶炼行业节能减排及可持续发展面临的关键问题.采用一步矿浆电解技术对氰化尾渣进行无害化处理,研究了电解氯氧化处理过程中NaCl添加量、外加电压、极板间距和电解时间等因素对电解氧化效果的影响,并采用高精度矿物解离分析系统对氰化尾渣进行了分析表征.研究结...

Treatment of cyanide tailings with slurry electrolysis technology

In this paper, one-step pulp electrolysis technology is used to detoxify cyanide tailings from gold smelting. NaCl addition amount, applied voltage, electrode spacing and electrolysis time were studied on electrolytic oxidation during direct electrolytic chlorine oxidation. Mineral Liberation Analyzer was used to deeply analyze the oxidation reaction mechanism of cyanide and the main encapsulated minerals during the process. The results show that with NaCl dosage of 0.5 g, the applied voltage of 8.0 V, plate spacing of 10 mm and electrolysis time of 4 h, the removal rates of CNT, CN−, Cu, Fe and Zn in the slurry are 94.83%, 98.94%, 85.65%, 84.51% and 73.85%, respectively. After the treatment, the proportion of pyrite from chalcopyrite and sphalerite continuously reduced by 12.04% and 20.17%, respectively, and free surface percentage content of pyrite reduced by 9.4%. Under the action of an electric field, Cl- migrates to the anode and preferentially oxidizes to Cl2/ClO−, which undergoes a redox reaction with the free cyanide and metal cyanide complex ions that migrate to the vicinity of the anode, resulting in the oxidation of cyanide to N2 and CO2, and some metal ions were precipitated by the electrodeposition reaction at the cathode. This study can achieve the goal of rapid, efficient and harmless treatment of cyanide tailings.