Pressure Leaching of Chalcopyrite Concentrates by Dynatec. Paper to be presented at Copper '99, sponsored by TMS of AIME, Phoenix, Arizona, USA, 10-13
1. Introduction. High temperature (200–230 °C) acid pressure oxidation leaching of metal sulfides was first commercialized in the 1950's. However, the more recent commercial success of medium temperature pressure oxidation of zinc sulfide concentrates and high temperature pressure oxidation of refractory gold ores and concentrates has contributed to renewed interest in the total oxidative ...
Based on the usage of sulfur dispersing agents, a two-stage pressure leaching process for zinc sulfide concentrates was invented (Veltman et al., 1977). Alternative additives have been investigated for improving the zinc pressure leaching processes. OPD was found effective to increase the zinc extraction (De Nys and Terwinghe, 1990).
The Dynatec zinc pressure leach process was selected in 1989 for integration with the existing circuit for a refinery expansion, 5 and the zinc pressure leach plant was constructed and operated in the early 1990s. 6 Since all of the iron present in the zinc concentrates was to be converted to hematite, a high acid zinc pressure leach was
2010-11-23 Pressure Leaching of Copper Concentrates ... (Chalcopyrite) Concentrate Leaching Electro-Winning Acid Flotation Primary Crushing Stockpile Leaching (Oxide) (Chalcocite) Sec/Tert Crushing Customers Smelting Electro-Refining Offers full cost benefit of $0.05-0.10/lb over smelting refining.
The suggested method consists of oxidative pressure leaching followed by hydrothermal pretreatment of chalcopyrite concentrates with copper sulfate solutions. The pressure oxidative leaching of the chalcopyrite concentrates allows Cu extractions up to 99% and produces Cu-rich solution for the hydrothermal pretreatment stage.
Unfortunately, high copper extractions are not attainable in a reasonable residence time unless the leaching temperature exceeds 200°C (oxygen pressure leaching) or chalcopyrite is ‘activated ...
Starting up the Sherritt Zinc Pressure Leach Process at Hudson Bay; Operation of the Sherritt Zinc Pressure Leach Process at the HBMS Refinery: The First Two Decades; Sherritt ZPL Study for China Western Mining Company High Zinc Extraction at High Altitude; Leaching of Copper concentrates. Pressure Leaching of Chalcopyrite Concentrates by Dynatec
The pressure leaching in sulfuric acid–oxygen media is a viable method to extract copper from sulfidized chalcopyrite concentrates producing solutions to be treated by SX and EW. – Selective copper dissolution from sulfidized chalcopyrite can be obtained at 100 °C and oxygen overpressures of about 304 kPa in less than 3 h of residence time.