关键词: 卡林型金矿, 氧压浸出, 固砷, 湿法冶金

Abstract: The "Golden Triangle"（Yunnan-Guizhou-Guangxi border region) is an important Carlin�type gold metallogenic belt in China. This type of deposit is characterized by sediment-hosted，micro-dis⁃ seminated ores，where gold occurs in an "invisible" form（<1 μm），encapsulated within sulfides such as py⁃ rite and arsenian pyrite（arsenopyrite）. Conventional cyanidation processes result in extremely low gold leaching rates. Addressing the characteristics of such refractory ores，a gold mine in Guizhou has developed a complete integrated hydrometallurgical process encompassing "pre-treatment—extraction—environmen⁃ tal protection". The core of this process is high-temperature and high-pressure oxygen pressure leaching， which decomposes gold-bearing sulfides to fully expose the encapsulated gold，creating favorable condi⁃ tions for subsequent carbon-in-leach gold recovery. The overall gold recovery rate is increased by more than 30% compared to conventional processes. Simultaneously，under high-pressure oxidation conditions， arsenic is stabilized and precipitated in the form of crystalline scorodite（FeAsO4 ·2H2O），significantly re⁃ ducing the risk of arsenic environmental migration. This achieves the dual objectives of efficient resource recovery and in-situ pollutant control.

Key words: carlin-type gold deposit, oxygen pressure leaching, arsenic fixation, hydrometallurgical process