METHOD OF METAL EXTRACTION FROM ORES Russian patent published in 2015 - IPC E21B43/28 

FIELD: mining.

SUBSTANCE: metal extraction method comprises a sequential formation injection through the system of injection wells with the solution containing hydrogen chloride and sodium hypochlorite, pumping-out of productive solutions through the system of extraction wells. After supply of the injection solution into the formation the hydraulic medium. providing pH acidity of the solution at the level 1.5-2.5, is injected at the pressure exceeding the formation pressure, the hydraulic impact in the formation is generated which is an additional leaching agent. The hydraulic medium is sulphuric, nitric, coal or sulphurous acid or their mixes. The hydraulic medium can be the mixing solutions of sodium carbonate-hydrocarbonate (Na₂CO₃+NaHCO₃), ammonium carbonate-hydrocarbonate ((NH₄)₂CO₃+NH₄HCO₃), sodium carbonate-hydroxide (Na₂CO₃+NaOH) or the brine with sodium carbonate saturated with CO₂. After supply of the hydraulic medium into the formation the injection solution containing sand with the fraction 0.5-2 mm is supplied again.

EFFECT: improvement of efficiency of metal extraction, decrease of negative environment impact.

7 cl, 1 dwg