Method for controlling concentration of cyanide ions to weaken copper dissolution in gold leaching process

• Main Authors: FANG JIN, FU DEGUI, TANG YUHE, GONG MINGHUI, QIU XIANYANG, HU ZHEN, LIU ZHIBIN, LI HANWEN, GAO QIFANG, LI PEILUN
• Format: Patent
• Language: Chinese; English
• Published: 06.07.2016
• Subjects: CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a method for controlling the concentration of cyanide ions to weaken copper dissolution in the gold leaching process. Chemical feed in batches and points is scientifically designed for cyanide leaching, it is successfully guaranteed that the concentration of free cyanide in the whole cyanide leaching process is stabilized between 0.05% and 0.08%, and selective gold leaching is achieved while copper dissolution is restrained; sodium cyanide is further scientifically added into a breaking and ore grinding system, the concentration of free CN is reasonably controlled between 0.02% and 0.03%, and sodium cyanide and fresh gold particle surfaces constantly exposed in the ore grinding process act; and under the low concentration of the cyanide ions, grinding and leaching are achieved at the same time, and a better technical effect is obtained. By means of the method, the gold leaching rate is remarkably increased, the copper leaching rate is further decreased, engineering implementation is fa