School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China.
Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569 Stuttgart, Germany; Institute of Physical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany.
Ultrason Sonochem. 2020 Jun;64:105039. doi: 10.1016/j.ultsonch.2020.105039. Epub 2020 Feb 15.
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.
开发了一种声化学反应器，以研究在低温下通过超声辅助从金矿石中氰化提取金。研究了超声对低温和常规条件下金浸出的影响。在 10°C 的低温下，超声辅助浸出分别使金精矿和氰化尾渣的金浸出率提高了 0.6%-0.8%，将氰化尾渣中的金含量降低至 0.28g/t。在常规的 25°C 温度下，超声辅助浸出与常规浸出相比，金的浸出率提高了 0.1%，氰化钠的单位消耗量减少了 15%。动力学模型的分析也表明，超声确实大大提高了金浸出的反应速度。进一步通过 X 射线衍射（XRD）、扫描电子显微镜（SEM）和粒度分析仪分析了矿石的矿物学和形态，以探讨金浸出强化的机理。结果表明，在超声处理下，矿石颗粒被粉碎，矿石颗粒表面被剥落，钝化膜被破坏，反应阻力降低。因此，在超声辅助氰化浸金中，金的浸出率得到提高，浸出时间显著缩短。
