The present invention discloses a short-process and low-cost continuous and stable
gold extraction process by
thiosulfate method, belonging to the field of
hydrometallurgy. In a closed reactor, by adjusting the concentrations of dissolved O2,
thiosulfate and catalyst to a lower level, the pulp potential is decreased to an appropriate range to leach
gold ore, and the leached residue and leached pregnant solution are obtained by
filtration. Pure
nitrogen is introduced into the leached pregnant solution to exhaust the
oxygen in the solution, and
copper powder is added for displacement. The
copper-rich crude
copper and the displacement lean solution are obtained by
filtration. The copper-rich crude copper is treated by electrolytic refining, pure copper is obtained at the
cathode, and gold mud is obtained at the
anode. The gold mud is washed with
dilute acid to obtain the
acid washing solution containing copper and pure gold. After adjusting the pH of the
acid washing solution containing copper, it is combined with the displacement lean solution supplemented with the leaching agent for the leaching of fresh ore in the next cycle. The method of the present invention takes into account the problems of long process flow, high cycle cost and great
environmental protection pressure of the copper-
ammonia-catalyzed
thiosulfate method, and is suitable for use in the
natural environment.