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Technology for secondary recovery of gold from flotation tailings

A technology for flotation tailings and secondary recovery, applied in the direction of improving process efficiency, can solve the problems of high cost, incomplete reaction, low beneficiation recovery rate, etc., achieve low cost, large processing capacity, and improve beneficiation recovery rate Effect

Inactive Publication Date: 2010-05-12
LINGBAO CITY JINYUAN MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are three disadvantages of this method: first, the high cost
Pool leaching requires manual extraction and filling of the pool, and the relatively low grade of flotation tailings is the main reason for the high cost
Second, during leaching, it is necessary to fully react with the chemical agent and oxygen to form a complex alloy, while the pool leaching only relies on the up and down flow of the liquid to complete the reaction process, resulting in incomplete reaction and low beneficiation recovery rate
Third, the amount of tailings after flotation is relatively large, and the treatment capacity of pool leaching is limited, so it is impossible to carry out continuous operation

Method used

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  • Technology for secondary recovery of gold from flotation tailings
  • Technology for secondary recovery of gold from flotation tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] As shown in the attached figure, the flotation tailings slurry is classified by a cyclone, the overflow is discharged directly, and the swirled out grit is used as raw ore for regrinding until the particle size is -200 mesh and the weight of the ore powder in the total ore powder is 100%. Mineral content is 78%, add calcium hydroxide and water to the ground mineral powder, adjust the pH of the pulp to 10.5, and the weight concentration of mineral powder is 47%, and then add 0.9kg of sodium cyanide per ton of ground mineral powder The amount of sodium cyanide is added to carry out cyanidation gold leaching, the gold leaching temperature is 25°C, and the gold leaching time is 8h. The leached gold is adsorbed by activated carbon, and the gold-loaded carbon obtained after the adsorption is saturated is sent to desorption. The desorption liquid used is the mass concentration prepared by adding water. 2% NaCN and 1% NaOH, the desorption pressure is 0.025Mpa, the desorption tem...

Embodiment 2

[0024] As shown in the attached figure, the flotation tailings slurry is classified by a cyclone, the overflow is discharged directly, and the swirled out grit is used as raw ore for regrinding until the particle size is -200 mesh and the weight of the ore powder in the total ore powder is 100%. Mineral content is 75%, add calcium hydroxide and water to the ground mineral powder, adjust the pH of the slurry to 10, and the weight concentration of the mineral powder is 45%, and then add 0.6kg of sodium cyanide per ton of ground mineral powder The amount of sodium cyanide is added to carry out cyanidation gold leaching, the gold leaching temperature is 20°C, and the gold leaching time is 6 hours. The leached gold is adsorbed by activated carbon, and the gold-loaded carbon obtained after the adsorption is saturated is sent for desorption. The desorption solution used is the mass concentration prepared by adding water. 2% NaCN and 1% NaOH, the desorption pressure is 0.025Mpa, the de...

Embodiment 3

[0026] As shown in the attached figure, the flotation tailings slurry is classified by a cyclone, the overflow is discharged directly, and the swirled out grit is used as raw ore for regrinding until the particle size is -200 mesh and the weight of the ore powder in the total ore powder is 100%. Mineral content is 80%, add sodium hydroxide and water to the ground mineral powder, adjust the pH of the slurry to 11, and the weight concentration of mineral powder is 50%, and then add 1.2kg of sodium cyanide per ton of ground mineral powder The amount of sodium cyanide is added to carry out cyanidation gold leaching. The gold leaching temperature is 30°C and the gold leaching time is 10h. The leached gold is adsorbed by activated carbon. After the adsorption is saturated, the gold-loaded carbon obtained is sent for desorption. 2% NaCN and 1% NaOH, the desorption pressure is 0.025Mpa, the desorption temperature is 130°C, the desorption solution obtained after desorption is electrolyz...

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Abstract

The invention particularly discloses a technology for the secondary recovery of gold from flotation tailings, which comprises the following steps: conducting cyclone classification on ore pulp of the flotation tailings, grinding the cyclone-classified grit as crude ore, conducting ore pulp mixing on the ground ore powder, conducting cyanide leaching of gold, absorbing the leached gold by active carbon, desorbing gold-loaded carbon after saturated adsorption, and electrolyzing the desorption solution after desorption, thus obtaining gold powder. Unlike conventional processes, the technology only needs investment on the power cost of equipment and material cost instead of implementing pit discharging and pit loading by staff and vehicles, therefore, compared with the conventional treatment method, the technology has the characteristics of low cost, large treatment quantity, continuous operation and the capability of enhancing the ore dressing recovery rate by floatation technology to the maximum extent.

Description

technical field [0001] The invention specifically relates to a process for secondary recovery of gold from flotation tailings. Background technique [0002] The grade of flotation tailings is low and the fineness is poor. The conventional secondary gold recovery process from flotation tailings is generally to dig out the tailings from the tailings pond for pool leaching to recover gold. There are three disadvantages of this method: first, the cost is high. Pool leaching requires manual extraction and filling of the pool, and the relatively low grade of flotation tailings is the main reason for the high cost. Second, during leaching, the complex metal needs to be fully reacted with the chemical agent and oxygen, while the pool leaching only relies on the up and down flow of the liquid to complete the reaction process, resulting in incomplete reaction and low beneficiation recovery rate. Third, the amount of tailings after flotation is relatively large, and the treatment cap...

Claims

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Application Information

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IPC IPC(8): C25C5/02C22B3/24C22B11/08
CPCY02P10/20
Inventor 王育森张跃民陈随军许万群董明刚郭永强周彬邢晓飞张涛丽韩江涛钱秀峰刘晓东吕帅林
Owner LINGBAO CITY JINYUAN MINING
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