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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AI-Extracted Technical Summary

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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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.

Application Domain

Process efficiency improvement

Technology Topic

Water contentOre concentrate +9

Image

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

Examples

  • Experimental program(2)

Example Embodiment

[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 figure 1 , The innermost ring and outer ring of the concentric ring and the bottom and upper part of the stuffing tank are filled with reducing agent, and the middle ring between the innermost ring and the outer ring is filled with cyanide tailings.
[0022] In this method, the reduction slag rate is 73%, the metallic iron content is 50%, the metallization rate is 97%, the iron recovery rate is 97%, and the gold and silver recovery rates are 85% and 75%, respectively.

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 ring packing method, see figure 1 , The innermost ring and outer ring of the concentric ring and the bottom and upper part of the stuffing tank are filled with reducing agent, and the middle ring between the innermost ring and the outer ring is filled with cyanide tailings. In this method, the reduction slag rate is 76%, the metallic iron content is 38%, the metallization rate can reach 98%, the iron recovery rate is 98%, and the gold and silver recovery rates are 73% and 71%.
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Description & Claims & Application Information

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