METHOD OF TREATMENT OF TECHNOGENIC GOLD-CONTAINING PLACERS Russian patent published in 1998 - IPC

FIELD: geotechnology; leaching of gold from ores in processing of technogenic placers. SUBSTANCE: the offered method includes pouring from atop with water of ore bulk loaded into tray with the help of hydraulic giants. Ore bulk in technogenic placers is presented in form of well washed from clay and partially disintegrated material. Water supplied to surface of ore bulk easily soaks through it. In this case, filtration flows carry to bottom part of tray gold particles together with ore fine fraction. In this way, ore bulk is separated into producing layer, which is subject to further treatment, and washed out layer, which contains no gold. Boundary between these layers is determined by testing. In further leaching of gold, reagent solution is supplied to producing layer only. Thickness of producing layer may be reduced by cyclic supply of water to surface of ore bulk with removal of washed out layer after each cycle. For this purpose, use also is made of activation of the process of gold transfer to tray bottom part by aeration of ore bulk, or by vibration, or pulsing action. To prevent possible losses of fine gold carried away with used water, one or even whole cascade of vessels are installed under discharge line, in which heavy suspended particles, including gold, are settled due to change of flow velocity. Accumulated precipitate is leached. EFFECT: reduced specific consumption of reagent and time for leaching. 4 cl, 2 dwg