Kinetics of leaching refractory gold ores by ultrasonic-assisted electro-chlorination

The resources of refractory gold ores are abundant, and their effective treatment can bring good economic benefits. This paper investigated the kinetics of leaching gold from refractory gold ores by ultrasonic-assisted electro-chlorination. The effects of ultrasound time ratio, initial hydrochloric acid concentration and leaching temperature on the kinetic parameters were discussed. It is found that the leaching ratio goes up with all the factors increasing. The reaction kinetics is controlled by diffusion. When ultrasound improves the diffusion by reducing the diffusion resistance, the activation energy increases to 37.1 kJ/mol.

Properties of Seamless W Sub-Micro Electrode Used for Phase Change Memory

以便改进可靠性填满设备，在直径 260 nm 加热电极的无缝的亚 micro W 与标准 0.18 亩 m 互补金属氧化物半导体处理被制作线。然后，我们成功地用加热电极的这无缝的亚 micro W 生产一台 chalcogenide 随机存取存储器设备。结果显示出好电的性能， e。g。直到 10 的 1.3mA 和设置 / 重设周期(9 ) 的重设电流被完成了。