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Method for recycling gold in cyanided tailings in ramified and series flotation mode

A branched flow, cyanidation tailings technology, applied in flotation, solid separation and other directions, can solve the problems of difficulty in gold extraction by flotation of fine-grained cyanide slag, decrease in flotability, and environmental pollution, and achieve significant technical and The effect of economic benefits, improved floatability, and broad application prospects

Active Publication Date: 2015-06-24
GUIZHOU ZIJIN MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, cyanidation tailings contain some heavy metal ions and cyanides, and their long-term storage in large quantities will pollute the environment.
In recent years, many researchers have studied gold extraction from cyanide tailings. However, due to the addition of sodium cyanide, lime, bleaching powder and other agents in the production process of cyanide slag, the surface properties of minerals will change after long-term cyanide treatment. In particular, gold-bearing pyrite and other gold-bearing sulfides are easily oxidized to reduce their buoyancy, coupled with the strong inhibitory effect of cyanide on sulfide minerals, making the fine-grained cyanide that is difficult to beneficiate itself Slag flotation gold extraction becomes more difficult

Method used

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  • Method for recycling gold in cyanided tailings in ramified and series flotation mode
  • Method for recycling gold in cyanided tailings in ramified and series flotation mode
  • Method for recycling gold in cyanided tailings in ramified and series flotation mode

Examples

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Effect test

Embodiment 1

[0017] A method for recovering gold in cyanidation tailings by branch series flotation, comprising the following steps:

[0018] The whole mud cyanidation tailings contain Au2.82g / t, carbon content 1.32%, sulfur content 0.92%, add water to adjust the slurry concentration to 20-40%, and stir continuously at normal temperature and pressure for 5-7 minutes, according to the chemical formula listed in Table 1, After stirring well, add Na 2 CO 3 , Fe 2 SO 4 Slurry pH = 7 ~ 8, pump the pretreated pulp into the stirring buffer tank, continue to stir for 15 to 20 minutes, flow into the slurry tank, add kerosene and terpineol oil, fully stir for 3 minutes, and the pulp enters the flotation machine Flotation decarbonization is carried out, and the foam product is filtered to obtain carbon-containing gold concentrate; the decarbonized pulp flows to the stirring distribution tank by itself, and the stirring distribution tank distributes the pulp evenly to the two mixing tanks. Add min...

Embodiment 2

[0021] A method for recovering gold in cyanidation tailings by branch series flotation, comprising the following steps:

[0022] A certain all-slimed cyanide tailings contains Au1.91g / t, carbon 1.15%, sulfur 0.52%, add water to adjust the slurry concentration to 20-40%, stir continuously at normal temperature and pressure for 5-7 minutes, according to the chemical formula listed in Table 1 , formula, after stirring evenly, add Na 2 CO 3 , Fe 2 SO 4 Slurry pH = 7 ~ 8, pump the pretreated pulp into the stirring buffer tank, continue to stir for 15 to 20 minutes, flow into the slurry tank, add kerosene and terpineol oil, fully stir for 4 minutes, and the pulp enters the flotation machine Flotation decarbonization is carried out, and the foam product is filtered to obtain carbon-containing gold concentrate; the decarbonized pulp flows to the stirring distribution tank by itself, and the stirring distribution tank distributes the pulp evenly to the two mixing tanks. Add mineral...

Embodiment 3

[0025] A method for recovering gold in cyanidation tailings by branch series flotation, comprising the following steps:

[0026] A certain all-slimed cyanide tailings contains Au1.42g / t, carbon 0.92%, sulfur 0.22%, add water to adjust the slurry concentration to 20-40%, stir continuously at normal temperature and pressure for 5-7 minutes, according to the chemical formula listed in Table 1 , formula, after stirring evenly, add Na 2 CO 3 , Fe 2 SO 4 Slurry pH = 7 ~ 8, pump the pretreated pulp into the stirring buffer tank, continue to stir for 15 to 20 minutes, flow into the slurry tank, add kerosene and terpineol oil, fully stir for 5 minutes, and the pulp enters the flotation machine Flotation decarbonization is carried out, and the foam product is filtered to obtain carbon-containing gold concentrate; the decarbonized pulp flows to the stirring distribution tank by itself, and the stirring distribution tank distributes the pulp evenly to the two mixing tanks. Add mineral...

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Abstract

The invention discloses a method for recycling gold in cyanided tailings in a ramified and series flotation mode. The method includes the following steps that ore pulp pretreatment is conducted, and sodium carbonate and ferrous sulfate are used as ore pulp regulators; coal oil flotation decarbonizing is carried out; ramified pulp mixing is conducted, the decarbonized ore pulp automatically flows to a stirring and distributing groove, and the ore pulp is evenly distributed to two pulp mixing barrels for mixing pulp through the stirring and distributing groove; ramified and series flotation is performed, foam products in first rougher flotation fully enter in second rougher flotation to be subjected to flotation together with the decarbonized ore pulp, foam products in second rougher flotation undergo closed circuit concentration operation of first concentration and second concentration to obtain gold concentrate, and no drug is added in the concentration stage; products in the groove of first rougher flotation are subjected to closed circuit scavenging of first scavenging and second scavenging to obtain tailings. By the adoption of the method, the recovery rate of the gold can be improved obviously, meanwhile, drug consumption is lowered, and the cost is saved.

Description

technical field [0001] The invention relates to the technical field of mineral processing, in particular to a method for recovering gold in cyanidation tailings by branch series flow flotation. Background technique [0002] Cyanide tailings are waste residues produced during the process of gold extraction by cyanidation of gold mines. They still contain recyclable gold, and the gold content is generally above 1g / t. It is a secondary resource. At the same time, cyanidation tailings contain some heavy metal ions and cyanides, and their long-term storage in large quantities will pollute the environment. In recent years, many researchers have studied gold extraction from cyanide tailings. However, due to the addition of sodium cyanide, lime, bleaching powder and other agents in the production process of cyanide slag, the surface properties of minerals will change after long-term cyanide treatment. In particular, gold-bearing pyrite and other gold-bearing sulfides are easily oxi...

Claims

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Application Information

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IPC IPC(8): B03D1/00B03D1/002B03D101/00
Inventor 傅飞龙
Owner GUIZHOU ZIJIN MINING
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