Yulin area containing a micro-fine copper were disseminated gold ore metal refractory gold ore, the primary metal minerals as pyrite ore, copper sulfide and small amounts of Pb, Zn, Sb minerals. The ore has a gold grade of 15 to 32 g/t, a copper content of 1.4% to 2.5%, and a sulfur content of 20% to 28%. The gold in the ore is mainly produced by natural gold, and is mainly wrapped in copper sulfide and pyrite. It is not suitable for mercury capture or conventional cyanide gold extraction.
The ore is ground to -200 mesh and calcined at 650-800 ° C for 4-6 h. For calcination, H 2 S0 4 with a mass concentration of 15 g/L was immersed in copper at 80-90 ° C and liquid-solid ratio (1.5-2):1 for 4 h. After the copper leaching residue, if the amount of copper is less than 0.5%, the gold is leached by an emulsification method; if it exceeds 0.5%, the gold is leached by liquid chlorination.
After exploratory experiment, 5% hydrochloric acid and saturated chlorine water were selected as the leaching agent, the leaching solid-liquid ratio was 1: (3~5), sealed and leached for 1h (there is free chlorine in the end), and the gold leaching rate was 95. More than % (original Au 32.8g / t, calcined slag Au 43.7g / t, saturated HCl water hydrochloric acid 5%, solid-liquid ratio 1:3, intermittent half an hour chlorine for 2h, residue Au 1.53g / t , Au leaching rate is 94.5%).
Saturated with chlorine containing 5% to 10% hydrochloric acid leaching of gold was expensive, the free chlorine was removed by filtration, washing with water and drying, to release a refractory crucible, a small amount of soda ash and borax, slowly heated in the charcoal, Then, the crucible and the gold alloy block are melted at a high temperature. The recovery rate of gold is 98%.
Recently, the United States has also reported a process for the leaching of sulfides, oxides and metal scraps by chloride oxygen. Preparation process comprises C1 2 -O 2, HC1-O 2, FeC1 2 -0 2, CaC1 2 -0 2, H 2 S0 4 -CaC1 2 -0 2, at a temperature of 95 ~ 102 ℃, pressure of 207 to 345 Leaching under kPa conditions, extracting Cu, Pb, Zn, Ni, Co, Hg, Au, Ag and other metals from complex sulfide concentrates, scrap metal, furnace waste and metal oxides, US Bureau of Mines It is also emphasized that air can be used as a source of O 2 , and subsequent metal recovery methods determine whether C1 2 , HCl, FeCl 2 or CaCl 2 is suitable for return to the reactor for reuse. Gold-containing arsenic, gold recovery element in 99% as an insoluble component to remain in the leaching residue are A1, As, Cr, Fe, S, Sb and Si.
Chloride-oxygen leaching is the most efficient and environmentally acceptable method for leaching metals from a wide variety of complex materials. Because no toxic gas, liquid or solid waste is produced. This technology has been proven at the factory and is a promising approach.
The ore is ground to -200 mesh and calcined at 650-800 ° C for 4-6 h. For calcination, H 2 S0 4 with a mass concentration of 15 g/L was immersed in copper at 80-90 ° C and liquid-solid ratio (1.5-2):1 for 4 h. After the copper leaching residue, if the amount of copper is less than 0.5%, the gold is leached by an emulsification method; if it exceeds 0.5%, the gold is leached by liquid chlorination.
After exploratory experiment, 5% hydrochloric acid and saturated chlorine water were selected as the leaching agent, the leaching solid-liquid ratio was 1: (3~5), sealed and leached for 1h (there is free chlorine in the end), and the gold leaching rate was 95. More than % (original Au 32.8g / t, calcined slag Au 43.7g / t, saturated HCl water hydrochloric acid 5%, solid-liquid ratio 1:3, intermittent half an hour chlorine for 2h, residue Au 1.53g / t , Au leaching rate is 94.5%).
Saturated with chlorine containing 5% to 10% hydrochloric acid leaching of gold was expensive, the free chlorine was removed by filtration, washing with water and drying, to release a refractory crucible, a small amount of soda ash and borax, slowly heated in the charcoal, Then, the crucible and the gold alloy block are melted at a high temperature. The recovery rate of gold is 98%.
Recently, the United States has also reported a process for the leaching of sulfides, oxides and metal scraps by chloride oxygen. Preparation process comprises C1 2 -O 2, HC1-O 2, FeC1 2 -0 2, CaC1 2 -0 2, H 2 S0 4 -CaC1 2 -0 2, at a temperature of 95 ~ 102 ℃, pressure of 207 to 345 Leaching under kPa conditions, extracting Cu, Pb, Zn, Ni, Co, Hg, Au, Ag and other metals from complex sulfide concentrates, scrap metal, furnace waste and metal oxides, US Bureau of Mines It is also emphasized that air can be used as a source of O 2 , and subsequent metal recovery methods determine whether C1 2 , HCl, FeCl 2 or CaCl 2 is suitable for return to the reactor for reuse. Gold-containing arsenic, gold recovery element in 99% as an insoluble component to remain in the leaching residue are A1, As, Cr, Fe, S, Sb and Si.
Chloride-oxygen leaching is the most efficient and environmentally acceptable method for leaching metals from a wide variety of complex materials. Because no toxic gas, liquid or solid waste is produced. This technology has been proven at the factory and is a promising approach.
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