The technology of gold, silver, platinum, etc.

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Uploaded: 13.06.2008
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Gold get amalgirovaniem or leaching. When amalgirovanii gold dissolved in mercury (Hg), forming an amalgam, when the content of Au is more than 15% becomes solid. From the resulting mercury amalgam in distilled condensing devices, leaving a nodule of Au and Ag (silver). Cleaning of Au silver discussed below. Leach solution using sodium or potassium cyanide - NaCN or KCN (concentrated solution in distilled water) in which Au in the presence of dissolved oxygen (blowing air) with formation of the complex anions [Au (CN) 2] - - tionally zolotokisly-potassium: 4Au + 8CN- + O2 + 2H2O = 4 [Au (CN) 2] - + 4OH-.
From the resulting solution is isolated gold ...


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