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Li Z.,National Local Joint Laboratory of Engineering | Zhang L.,National Local Joint Laboratory of Engineering | Zhang L.,Yunnan Provincial Key Laboratory of Intensification Metallurgy | Zhang L.,Key Laboratory of Unconventional Metallurgy | And 14 more authors.
High Temperature Materials and Processes | Year: 2015

The new technology of dechlorination from zinc oxide dust by microwave roasting was investigated, combined with the advantages of microwave selective heating and based on a thermodynamic analysis of zinc and lead halides. The associated dechlorination reactions were discussed in details and the effect of all the influencing parameters such as roasting temperature, holding time, stirring speed and air flow were systematically investigated. Experimental results showed that zinc oxide dust dechlorination rate could reach over 95% and meet the requirements of wet smelting electrolysis, given an air flow of 300 L/h, a stirring speed of 60 r/min, a roasting temperature of 650 °C and a holding time of 30 min. Microwave roasting provided a new solution to the dechlorination from zinc oxide dust. © 2015 by De Gruyter 2015. Source


Zhang G.,State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization | Zhang G.,National Local Joint Laboratory of Engineering | Zhang G.,Kunming University of Science and Technology | Wang S.,State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization | And 8 more authors.
ISIJ International | Year: 2016

The effect of ultrasonic energy on the pretreatment and leaching of gold from the refractory ore was investigated. Firstly, the refractory ore was pretreated with sodium hydroxide under ultrasound. Secondly, the pretreated ore was leached under ultrasound. The leaching ratio of gold decreased with increasing of the ultrasound pretreatment time from 1 to 5 h and the NaOH concentration from 5 to 20 wt%. The ultrasound increased remarkably the leaching ratio of gold when the pretreated ore was subjected to ultrasound leaching. The results showed that the appropriate acoustic power was a requirement during the ultrasound-intensified leaching. The leaching ratio of gold increased with an increasing of NaCN concentration from 6 to 18 kg/t. The results demonstrated that the ultrasound is a viable extractive metallurgy technique in pretreatment and leaching for the refractory gold ores. Source


Li J.,Yunnan Provincial Key Laboratory of Intensification Metallurgy | Li J.,Key Laboratory of Unconventional Metallurgy | Li J.,National Local Joint Laboratory of Engineering | Li J.,Kunming University of Science and Technology | And 26 more authors.
Nuclear Engineering and Technology | Year: 2016

Uranium removal from uranium plant wastewater using zero-valent iron in an ultrasonic field was investigated. Batch experiments designed by the response surface methodology (RSM) were conducted to study the effects of pH, ultrasonic reaction time, and dosage of zero-valent iron on uranium removal efficiency. From the experimental data obtained in this work, it was found that the ultrasonic method employing zero-valent iron powder effectively removes uranium from uranium plant wastewater with a uranium concentration of 2,772.23 μg/L. The pH ranges widely from 3 to 7 in the ultrasonic field, and the prediction model obtained by the RSM has good agreement with the experimental results. © 2016. Source

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