FLOW LINE FOR YEAR-ROUND HEAP LEACHING OF NOBLE METALS IN CRYOLITHIC ZONE Russian patent published in 2013 - IPC E21B43/28 

FIELD: mining.

SUBSTANCE: flow line for year-round heap leaching of noble metals in a cryolithic zone comprises a reinforced concrete pan with a board, ore pile filled on top of it, a drainage system installed underneath and connected with a complex of devices for operation in summer time, comprising a buffer reservoir serially connected with a device for noble metals deposition with self-flow pipelines, and the devices are arranged below the border of the seasonal freezing-thawing of soils, and also an auxiliary pump, a receiving reservoir, which communicates with a device for additional strengthening of the solution and the main pump connected by a discharge pipeline with a sprinkling system deepened into the near-surface layer of the ore pile, and also a complex of devices for operation in winter time, comprising the following components connected in series with additional self-flow pipelines and arranged below the border of seasonal freezing-thawing of soils: an additional buffer reservoir, the specified device for deposition of noble metals, an additional receiving reservoir, which communicates with the specified device for additional strengthening of solutions and an additional pump connected with an additional discharge pipeline via a device for solution heating with a sprinkling system. The specified device for deposition of noble metals is communicated with emergency pipelines to an emergency reservoir, an additional buffer reservoir and an additional receiving reservoir. The line is equipped with a heat-insulating screen and a heat-insulating jacket, with which the drainage system and the specified process equipment are separated from permafrost rocks of the cryolithic zone. Besides, the device for solution heating has a closed heat supply system, which connects in series a water jacket of a solid fuel gasifier and a water boiler of a heat generator, besides, the gas burners of the latter are connected by a gas flue with a gasifier, at the same time the drain nozzle of heat generator spent gas is connected with a gas duct via a distribution valve with a sprinkling system, comprising a gas duct in the heat-insulating coating of the sprinkling system at its far end.

EFFECT: invention makes it possible to increase reliability and efficiency of operation of a flow line of year-round heap leaching of noble metals under conditions of a cryolithic zone by maintenance of positive temperatures along the length of the flow line in the technological process of leaching by improvement of heat insulation of a working area in process of leaching and heating of a sprinkling system with hot gases during process interruptions of heated solution supply in winter time.

2 cl, 1 dwg