Abstract
The oxidation roasting of carbon-bearing micro-fine gold can eliminate or weaken the robbing effect of carbonaceous materials and clay, and destroy the encapsulation of micro-fine gold. The micropores produced by gas escaping during the roasting process are conducive to the diffusion of leaching agents, thus enhancing the cyanide leaching of gold. In this paper, the influence of the aeration rate during roasting on the leaching rate of fine-grained carbonaceous gold ore and its mechanism were studied using thermodynamic calculations, crystal structure analysis, surface chemical groups and bonds analysis, microporous structure analysis, and surface morphology detection. Under suitable roasting conditions, the carbonaceous and pyrite in the ore are oxidized, while carbonate minerals such as dolomite and calcite as well as clay minerals are decomposed, and the gold-robbing materials lose their activity. The experimental results have theoretical and practical significance for the popularization and application of oxidation roasting technology of fine carbon-bearing gold ore.
Highlights
Gold plays an important role in the world economy, and its production and reserves are some of the important indicators used to measure a country’s financial status [1]
Natural gold is mainly wrapped in detritus composed of limonite, carbonaceous material, pyrite, and quartz
The results of the oxidation roasting leaching test showed that the leaching rate of gold was only 12.50% when the raw ore was directly cyanide leached
Summary
Gold plays an important role in the world economy, and its production and reserves are some of the important indicators used to measure a country’s financial status [1]. With the continuous development of gold mineral resources, the need for efficient, sustainable, and environmentally friendly means for processing refractory gold resources is posing a major technical challenge to gold-producing companies around the world [2,3]. Province is one of the main gold-producing areas in China, relying on carbon-bearing deposits, which are mainly distributed in the Qinba area. The Sulinggou, Xiajiadian, Wangjiaping, and Jinlongshan gold deposits in the Shangluo area are carbonaceous deposits bearing micro-fine-grained gold. There are three main reasons why the ore is difficult to treat: firstly, carbonaceous materials and clay minerals adsorb dissolved gold in the process of cyanide leaching, resulting in gold-robbing. Gold with a fine grain size is embedded in quartz and other minerals, so that even fine grinding cannot liberate the gold particles to establish contact with the reagent. The carbonaceous materials are intimately associated with reagent consuming gangue minerals [4,5,6]
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