<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Li Jing-ying</style></author><author><style face="normal" font="default" size="100%">Xu Xiu-li</style></author><author><style face="normal" font="default" size="100%">Liu Wen-quan</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Thiourea leaching gold and silver from the printed circuit boards of waste mobile phones</style></title><secondary-title><style face="normal" font="default" size="100%">Waste Management</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Waste mobile phones</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2012</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.sciencedirect.com/science/article/pii/S0956053X12000402</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">6</style></number><volume><style face="normal" font="default" size="100%">32</style></volume><pages><style face="normal" font="default" size="100%">1209 - 1212</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">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 Fe3+ concentrations and temperature on the leaching of gold and silver from waste mobile phones was investigated. Gold extraction was found to be enhanced in a PCBs particle size of 100 mesh with the solutions containing 24&amp;#xa0;g/L thiourea and Fe3+ concentration of 0.6% under the room temperature. In this case, about 90% of gold and 50% of silver were leached by the reaction of 2&amp;#xa0;h. The obtained data will be useful for the development of processes for the recycling of gold and silver from the PCBs of waste mobile phones.</style></abstract></record></records></xml>