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The present communication deals with the leaching of gold and silver from the printed circuit boards (PCBs) of waste mobile phones using an effective and less hazardous system, i.e., a thiourea leaching process as an alternative to the conventional and toxic cyanide leaching of gold. The influence of particle size, thiourea and Fe 3+ concentrations and temperature on the leaching of gold and...
Abstract-A new hydrometallurgical recovery technology of leaching gold and silver from E-waste has been presented by Lime Sulfur Synthetic Solution (LSSS) method. The influences of sodium sulfite concentration, divalent copper ions concentration, aqueous ammonia concentration, reaction temperature and leaching time were investigated experimentally. The results indicated that it was favorable for gold...
In this study, a new hydrometallurgical recovery technology of leaching copper from waste computer mainboards (WCM) has been presented using ammonia-ammonium chloride buffering solution as leachant and hydrogen peroxide solution ( AR, 30% w/w) as oxidant. The influences of aqueous ammonia concentration, ammonium chloride concentration, dose of hydrogen peroxide, reaction temperature and leaching time...
This paper has studied the effect on economic growth of human capital inequality and provided the measurement of stock and inequality of human capital. After calculating Gini coefficient and ratio of top quintile to bottom quintile (top20/bottom20) of human capital of each province (municipal or district) in China, considering other factors influencing economic growth, we use economic growth equation...
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