Application of Eh-pH Diagram for Activation of Depressed Chalcopyrite in Cyanidation Tailings

作者：Yang, Xiuli; Huang, Xiong; Qiu, Tingsheng^*; Jiao, Xiangke

来源：Mineral Processing and Extractive Metallurgy Review, 2016, 37(2): 134-138.

DOI：10.1080/08827508.2015.1115989

• Activation
• cyanide
• depressed chalcopyrite
• Eh-pH diagram
• froth flotation

Potential-pH diagrams for a chalcopyrite-xanthate-H2O and chalcopyrite-NaCN-H2O systems at 298 K were constructed to predict depressing components in the flotation of depressed chalcopyrite in cyanidation tailings using xanthate as a collector. Sodium hypochlorite, hydrogen peroxide, and copper sulfate were used as activators to reduce this depression effect, and the potential-pH diagram for the activator-H2O system was constructed to predict the thermodynamic activating ability. Fe(CN)(6)(4-) and Cu(CN)(4)(3-) were dominant in the acidic-to-alkaline region. In alkaline solution, the generation potentials of Fe(CN)(6)(4-) and Cu(CN)(6)(4-) were lower than that of CuX. Therefore, they are the main depressing components that influence the flotation of chalcopyrite in cyanidation tailings. In the alkaline region, the oxidative potentials of sodium hypochlorite, hydrogen peroxide, and copper sulfate were significantly higher than that of CN-, so CN- was easily oxidized. This resulted in activation through the loss of hydrophilicity.

• 出版日期2016-3-3
• 单位江西理工大学