Method for reclaiming gold and silver in tailings after roasting-cyaniding of gold concentrate

A recovery method and technology for gold concentrate, applied in the field of hydrometallurgy, can solve the problem of insufficient recovery of tailings, and achieve the effects of easy popularization and application, significant benefits, and huge economic and social benefits

Active Publication Date: 2011-01-12
HENAN ZHONGYUAN GOLD SMELTERY
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Problems solved by technology

Since the tailings contain more than 30% iron, they can be used in cement plants to produce cement additives, so most of t

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  • Method for reclaiming gold and silver in tailings after roasting-cyaniding of gold concentrate

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[0019] Example 1

[0020] The tailings after roasting and cyanidation of gold concentrate contains 2g / t gold, 45g / t silver, 40% total iron, 5% moisture in the tailings after drying, calcium carbonate 8% of the tailings mass, anthracite coal powder The added amount is 80% of the tailings mass. Reduced in a tunnel kiln at 1100°C for 15 hours, then cut off the air and cool it out. After separating and removing coal powder impurities, the sponge iron is crushed; the crushed metal iron powder is diluted with industrial concentrated sulfuric acid and acid-dissolved to obtain The iron solution, the acid dissolution conditions are as follows: temperature 80℃, final acid concentration 15g / L, ferrous concentration 89g / L, acid dissolution for 3h. The carbon slurry cyanidation method is used to extract the gold and silver precious metals from the acid slag. The ferrous solution is evaporated and crystallized to obtain the ferrous product.

[0021] Using canned ring packing method, see figur...

Example Embodiment

[0023] Example 2

[0024] The tailings after roasting and cyanidation of gold concentrate contain gold 1.8g / t, silver 40g / t, iron 30%, the moisture content of the tailings after drying is 2%, the addition of calcium carbonate is 10% of the tailings mass, anthracite coal powder The added amount is 70% of the tailings mass. Reduced in a tunnel kiln at 1000°C for 10 hours, then cut off the air and cool it out. After separating and removing pulverized coal impurities, the sponge iron is crushed; the crushed metal iron powder is diluted with industrial concentrated sulfuric acid and acid-dissolved to obtain Iron solution, acid dissolution conditions are as follows: temperature 80℃, final acid concentration 15g / L, ferrous concentration 85g / L, acid dissolution for 2.5h. The carbon slurry cyanidation method is used to extract the gold and silver precious metals from the acid slag. The ferrous solution is evaporated and crystallized to obtain the ferrous product.

[0025] Using canned ri...

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Abstract

The invention belongs to the technical field of hydrometallurgy, in particular to a method for reclaiming gold and silver in tailings after roasting-cyaniding of gold concentrate. The method comprises the following steps: drying the tailings until the water content of the tailings is not higher than 10 percent by weight; adding desulfurizing agent and reducing agent to reduce for 10 to 30 hours at the temperature between 900 and 1,200 DEG C; discharging after the tailings are isolated from air and cooled; crushing the tailings subject to impurity removal by separation; carrying out acid-leaching the crushed metal iron powder to obtain ferrous solution; and extracting the gold and silver noble metals in the acid-leaching residue. The method has simple process and low requirement on raw materials, reclaims the valuable elements in the tailings with low production cost, not only reclaims the metal iron, but also effectively reclaims the gold, silver and other noble metals, reduces tailing pollution, and avoids resource waste.

Description

(1) Technical field [0001] The invention belongs to the technical field of hydrometallurgy, in particular to a method for recovering gold and silver from tailings after gold concentrate roasting and cyanidation. (2) Background technology [0002] At present, domestic gold and precious metal smelting enterprises process complex minerals such as gold concentrates and copper-gold concentrates, mainly by first roasting, then acid leaching to remove copper, and then cyanidation to extract gold. The tailings after gold extraction by cyanide also contain more than 30% iron, 2g / t gold, 40-60g / t silver and other precious metals. Since the tailings contain more than 30% iron, they can be used in cement plants to produce cement additives, so most of them are sold to cement plants at a lower price at present, while the valuable metals in the tailings are not fully recovered. (3) Contents of the invention [0003] The purpose of the present invention is to provide a method for recover...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 任文生彭国敏俎小凤张福元朱晓刚史振兴
Owner HENAN ZHONGYUAN GOLD SMELTERY
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