Oxidation Roasting of Fine-Grained Carbonaceous Gold Ore: The Effect of Aeration Rate

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.

Using Kerosene as an Auxiliary Collector to Recover Gold from Refractory Gold Ore Based on Mineralogical Characteristics

“…Therefore, for complex and refractory gold mines, the ore is generally pretreated to eliminate the influence of unfavorable factors on leaching in the gold ore by changing the physical and chemical properties of the ore so as to obtain the best leaching rate. However, the pretreatment process requires high-pollution and high-energy consumption processes, such as roasting, and the leaching process also requires a large number of highly toxic substances, such as cyanide, which greatly damages the environment [16][17][18][19]. Therefore, it is an effective separation method to enrich the target minerals using flotation reagents through beneficiation technology, increasing the gold grade in the concentrate and greatly reducing the use of cyanide and energy consumption [20,21].…”