Multiple roasting gold extracting method for unmanageable arsenic-containing gold concentrate

[0015] Example 1

[0016] 1. Ingredients: The tailings after secondary roasting and cyanidation for gold extraction, in which the gold grade is 7.50g / t, and the high-grade sulfide ore containing gold, silver and copper in a ratio of 1:2, are mixed in a slurry tank. , and add water to adjust the slurry concentration to 70%, at room temperature and pressure, and continuously stir to obtain a slurry suitable for roasting conditions with a sulfur content of 25.10%;

[0017] 2. Roasting: The prepared pulp is sent to the boiling furnace for sulfate roasting, and the temperature is controlled at 630°C; the generated sulfur dioxide flue gas enters the acid production system to produce sulfuric acid; the generated slag enters the acid leaching process;

[0018] 3. Acid leaching: in the acid leaching tank, acid leaching the roasting slag with sulfuric acid, control pH=1, the temperature is 85°C, and the liquid-solid ratio is 1.5:1;

[0019] 4. The produced copper-containing acid leachin

[0021] Example 2

[0022] 1. Ingredients: Mix the tailings after secondary roasting and cyanidation for gold extraction, in which the gold grade is 8.10g / t, and the ratio of 1:2 with the high-grade sulfide ore containing gold, silver, and copper is carried out in the mixing tank. , and add water to adjust the slurry concentration to 68%, at room temperature and pressure, and continuously stir to obtain a slurry suitable for roasting conditions with a sulfur content of 25.90%;

[0023] 2. Roasting: The prepared pulp is sent to the boiling furnace for sulphation roasting, and the temperature is controlled at 580°C; the generated sulfur dioxide flue gas enters the acid production system to produce sulfuric acid; the generated slag enters the acid leaching process;

[0024] 3. Acid leaching: in the acid leaching tank, acid leaching the roasting slag with sulfuric acid, control pH=1.5, the temperature is 90°C, and the liquid-solid ratio is 1.4:1;

[0025] 4. The produced copper-con

[0027] Example 3

[0028] 1. Ingredients: The tailings after secondary roasting and cyanidation for gold extraction, in which the gold grade is 9.28g / t, and the high-grade sulfide ore containing gold, silver and copper in a ratio of 1:2, are mixed in a slurry tank. , and add water to adjust the slurry concentration to 69%, at room temperature and pressure, and continuously stir to obtain a slurry suitable for roasting conditions with a sulfur content of 22.90%;

[0029] 2. Roasting: The prepared pulp is sent to the boiling furnace for sulphation roasting, and the temperature is controlled at 680°C; the generated sulfur dioxide flue gas enters the acid production system to produce sulfuric acid; the generated slag enters the acid leaching process;

[0030] 3. Acid leaching: in the acid leaching tank, acid leaching the roasting slag with sulfuric acid, control pH=2.0, the temperature is 70°C, and the liquid-solid ratio is 1.6:1;

[0031] 4. The produced copper-containing acid le