Gold extraction operations generate a variety of wastes requiring responsible disposal in compliance with current environmental regulations. During recent decades, increased emphasis has been placed on effluent control and treatment, in order to avoid the threat to the environment posed by toxic constituents. In many modern gold mining and ore processing operations, cyanide species are of most ...

Hydrogen peroxide, Ethylene glycol, Citric acid, Stability, Copper, Ergun’s test Abstract: Owing to its high oxidising power and environmentally friendly nature, hydrogen peroxide (H2O2) is commonly used in environmental and hydrometallurgical applications such as treatment of cyanidation effluents and leaching of metals from ores/concentrates/waste materials. However, H2O2 rapidly undergoes ca...

However, the conventional gold recovery process is cyanidation, due to the recent environmental laws; researchers are looking for alternative methods for the recovery of gold. Furthermore, the copper anode slime is one of the most important secondary sources of gold (about 1200 ppm). So, the main objective of the current work is gold separation from copper anode slime as a rich secondary source...

The metallurgical testings to treat the Kenyan artisanal gold mining samples were performed with several processes such as gravity concentration (i.e., Knelson Concentrator and panning), flotation, cyanidation or leaching. These tests conducted find best processing stages improve recovery. From three categories of treated, sample A, which was processed through produced 95.64% Meanwhile, B could...

Most gold deposits occur associated with sulphides like pyrite and arsenopyrite; thus, precious metal dissolution is possible by oxidizing auriferous sulfide concentrate using simultaneous pressure oxidation cyanidation. The effectiveness of this process extraction can be influenced the temperature, cyanide (NaCN) concentration, oxygen pressure. In study, we conducted experiments to characteriz...

Environmentally friendly pretreatment of double refractory gold ores (DRGO) to improve recovery without emitting pollutant gas is challenging. Sequential biotreatment, including iron-oxidizing microorganisms decompose sulfides, followed by the enzymatic decomposition carbonaceous matter, was recently developed. The effect acid washing 1 M HCl for 24 h between two bioprocesses evaluated using a ...

Recovery of gold from copper-rich ores has proved challenging. Dissolved copper in cyanide-deficit leach solutions severely interferes with adsorption resulting low recoveries onto activated carbon or ion exchange resins. This study reports the efficiency different adsorbents for selective recovery copper-containing cyanide leachate. Activated (NORIT GAC 1240), mixed base (Purogold A193), stron...