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Ultrasound-assisted cyanide extraction of gold from gold concentrate at low temperature
- Source :
- Ultrasonics sonochemistry. 64
- Publication Year :
- 2019
-
Abstract
- A sonochemical reactor was developed to study the ultrasound-assisted cyanide extraction of gold from gold ore at low temperature. The effects of ultrasound on gold leaching in low temperature and conventional conditions were investigated. At the low temperature of 10 °C, ultrasound-assisted extraction increased extraction rate of gold by 0.6%–0.8% and reduced the gold content of cyanide tailings to 0.28 g/t in the leaching of gold concentrate and cyanide tailings, respectively. At the conventional temperature of 25 °C, ultrasound-assisted extraction obtained a 0.1% higher extraction rate of gold compared with conventional extraction, with the unit consumption of NaCN reduction of 15%. The analysis of kinetic model also demonstrated that sonication indeed improved the reaction of gold leaching greatly. The mineralogy and morphology of ore were further analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM) and particle size analyzer to explore the strengthening mechanism of gold leaching. The results showed that the ore particles were smashed, the ore particle surface was peeled, the passive film was destroyed and the reaction resistance decreased under ultrasonic processing. Therefore, the extraction rate of gold was improved and the extraction time was shortened significantly in ultrasound-assisted cyanide extraction.
- Subjects :
- Materials science
Acoustics and Ultrasonics
Scanning electron microscope
Cyanide
Sonication
Organic Chemistry
02 engineering and technology
Particle Size Analyzer
010402 general chemistry
021001 nanoscience & nanotechnology
Ultrasound assisted
01 natural sciences
Tailings
0104 chemical sciences
Inorganic Chemistry
chemistry.chemical_compound
chemistry
Chemical Engineering (miscellaneous)
Environmental Chemistry
Radiology, Nuclear Medicine and imaging
Leaching (metallurgy)
Gold ore
0210 nano-technology
Nuclear chemistry
Subjects
Details
- ISSN :
- 18732828
- Volume :
- 64
- Database :
- OpenAIRE
- Journal :
- Ultrasonics sonochemistry
- Accession number :
- edsair.doi.dedup.....f8579c03d69d73dc774f02b678d78bc5