Advances in Gold Ore Processing
This paper presents a brief overview of some IRGIREDMET advances in gold hydrometallurgy.Original impulse-percolation technology and equipment for intensive cyanidation of gravity concentrates have been developed and introduced into industrial practice by IRGIREDMET since 1980s (RF Patents N1593250). The process is based on leaching using special hydrodynamic and reagent conditions providing high dissolution rate for coarse gold particles. Gold and silver are precipitated from pregnant solution by cementation or electrowinning. There was also proposed an improved cementation method using zinc in a contact with electrically conductive material. The units including closed water recirculation, tails detoxification and semi-dry tails disposal were developed for the mines and operations without their own cyanidation facilities.IRGIREDMET is well experienced in gold adsorption technology using ion exchange resins and activated carbons. The comparison of CIL and RIL processes were done for a number of gold mines,for example for Sukhoi Log gold deposit. The properties of prospective foreign and domestic adsorbents including strong-base, bi-functional and weak-base resins as well as activated carbons were studied. The Institute has developed some adsorption/elution technologies and equipment, such as a two stage RIP adsorption technology for gold/silver ores, an improved technology for gold elution from loaded resin and carbon, electrowirming cells for gold recovery from RIP and CIP eluates etc.Large scale Resin In Pulp tests using weak-base resin were finalized and process design criteria were developed. Gold plant design is on progress at the moment.Improved technology for carbonaceous (preg-robbing) gold ores was developed. It was tested for some gold deposits including Sukhoi Log. It allows to overcome preg-robbing activities of ores treated and to improve dramatically performance of cyanidation and adsorption circuits.The studies on refractory gold ore treatment including bio-oxidation, pressure oxidation, roasting and ultra-fine grinding were conducted.Heap leach technology was tested and introduced by Irgiredmet for a number of Russian mines.Zinc cementation, activated carbon and ion-exchange resin adsorption were used for gold recovery from pregnant heap leach solutions. The options including combined technology Heap leach/RIL or CIP for clay ores were also developed and tested. The plant using developed technology is at construction stage now.The study on In-Situ gold leaching was conducted. The comparison of different gold lixiviants for this purpose was camed out. Gold recovery from pregnant leach solution by activated carbon and anionite including gold elution from loaded adsorbents etc. was also studied. In 2000 the In-Situ leaching technology was commissioned at Maminskoye gold deposit (Ural).The technologies for treatment of complex ores and by-products were proposed. For example,the technology of gold, silver, copper and zinc recovery from calcines after sulphuric acid production was developed.
Gold Preg-robbing Eomplex and refractory ores Intensive cyanidafion Adsorption Activated carbons Anionites Heap leaching In-situ leaching Equipment for hydrometallurgy
V. E. Dementyev G. I. Voiloshnikov
IRGIREDMET, Irkutsk, Russia
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
2765-2773
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）