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Method for flotation recovery of gold from gold-extracting tailings obtained from preliminary biooxidation-carbon-in-pulp process

A technology for pre-oxidation and recovery of gold, applied in the field of comprehensive utilization of resources, can solve the problems of unpublished specific names of leaching aids, large amount of leaching aids, and high cost, and achieve the goal of improving floatability, increasing recovery rate, and realizing recovery. Effect

Active Publication Date: 2015-03-25
JIANGXI YIYUAN REGENERATION RESOURCE CO LTD
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Problems solved by technology

[0004] The patent application number 201010259923.0 discloses a method for enriching iron sulfur from cyanide tailings by using a functional composite sol. The conventional cyanide tailings are treated, and the tailings are different from the tailings obtained by the carbon slurry method. In this patent, dilute sulfuric acid and functional composite sol are successively added to the conventional cyanide tailings slurry to stir, and then conventional flotation is performed to obtain gold-rich sulfur concentrate. The problem with this method is that dilute sulfuric acid is directly added to the cyanide tailings, will lead to residual CN in the tailings - Escaping in the form of HCN gas, endangering the environment
This method has the disadvantages of long fine grinding time, high cost, and a large amount of leaching aid, and the specific name of the leaching aid has not been announced.
[0007] The above technical status shows that although relevant researchers have done more research on the recovery and reuse of resources in cyanidation tailings, and have also proposed some solutions, but the existing methods have certain shortcomings, and the improvement of carbon slurry method is very important. There are few studies on gold tailings
However, the modified activated carbon loaded with nanometer iron and copper is used as a carrier to remove cyanide, iron arsenate colloid and jarosite colloid, and organic colloids from the tailings of gold extraction by the biological preoxidation-carbon slurry method, as a carrier to achieve Carrier flotation of fine-grained gold-bearing carbon, and the method of improving the recovery rate of gold in this type of tailings has not been reported so far

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  • Method for flotation recovery of gold from gold-extracting tailings obtained from preliminary biooxidation-carbon-in-pulp process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The analysis results of the tailings of a biological preoxidation-carbon slurry method are as follows: the content of Au is 3.65g / t, the content of Ag is 2.10g / t, the content of Cu is 0.05%, the content of Pb is 0.12%, and the content of C is 0.42%. Occurrence in granular state, pyrite is the main carrier mineral of gold.

[0045] use as figure 1 The shown flow process carries out flotation recovery gold, and concrete steps are:

[0046] (1) Pretreatment

[0047] The biological pre-oxidation-carbon leaching method gold extraction tailings and water were prepared into a slurry with a mass concentration of 40%, and 100 g / t of isooctyl alcohol was added, and the rotation speed was 1700 r / min and stirred for 8 minutes; Modified activated carbon 1.5kg / t, stirring for 15min at a rotational speed of 1700r / min.

[0048] (2) Carrier flotation decarbonization

[0049] Adjust the pulp in step (1) to a pulp concentration of 25%, add 60 g / t of kerosene, stir for 3 min at a rotat...

Embodiment 2

[0066] The tailings of a biological preoxidation-carbon slurry method were tested and analyzed, and the results are as follows: Au content 4.07g / t, C content 0.39%, Pb content 0.08%, Zn content 0.15%, gold is mainly in the state of fine particles The main carrier minerals of gold are pyrite and arsenite.

[0067] use as figure 1 The shown flow process carries out flotation recovery gold, and concrete steps are:

[0068] (1) Pretreatment

[0069] The biological pre-oxidation-carbon leaching method gold extraction tailings and water were prepared into a slurry with a mass concentration of 50%, and 150 g / t of isooctyl alcohol was added, and the rotation speed was 1900 r / min and stirred for 12 minutes; Modified activated carbon 2.5kg / t, stirring for 20min at a rotational speed of 1900r / min.

[0070] (2) Carrier flotation decarbonization

[0071] Adjust the pulp in step (1) to a pulp concentration of 30%, add 120 g / t of kerosene, stir for 5 min at a rotational speed of 1500 r / m...

Embodiment 3

[0088] The test analysis results of the tailings of a biological preoxidation-carbon slurry method are: Au content 3.20g / t, C content 0.31%, Pb content 0.11%, Cu content 0.03%, Zn content 0.07%, gold is mainly in the state of fine particles Inlaid, the main carrier minerals of gold are arsenopyrite and pyrite.

[0089] use as figure 1 The shown flow process carries out flotation recovery gold, and concrete steps are:

[0090] (1) Pretreatment

[0091] The biological pre-oxidation-carbon leaching method gold extraction tailings and water were prepared into a slurry with a mass concentration of 45%, and 120 g / t of isooctyl alcohol was added, and the rotation speed was 1800 r / min and stirred for 11 minutes; Modified activated carbon 2.0kg / t, stirring for 18min at a rotational speed of 1750r / min.

[0092] (2) Carrier flotation decarbonization

[0093] Adjust the pulp in step (1) to a pulp concentration of 27%, add 80 g / t of kerosene, stir for 4 min at a rotational speed of 140...

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Abstract

The method provides a method for flotation recovery of gold from gold-extracting tailings obtained from a preliminary biooxidation-carbon-in-pulp process, and belongs to the technical field of comprehensive utilization of resources. The method comprises the following steps: firstly, preprocessing gold-extracting tailings obtained from a preliminary biooxidation-carbon-in-pulp process by virtue of nano copper / iron-loaded modified active carbon so as to remove residual cyanide which can inhibit the flotation of pyrite in the tailings; and netting ferric arsenate and jarosite colloids by virtue of colloidal substances generated from the nano copper / iron-loaded modified active carbon such as ferric hydroxide and adsorbing organic colloidal substances so as to eliminate a harmful effect on the flotation; meanwhile, carrying out carrier flotation on micro / fine-grained gold-containing carbon in the tailings by taking the nano copper- and iron-loaded modified active carbon as a carrier, so as to greatly improve the floatability of the micro / fine-grained gold-containing carbon. After flotation and decarburization, and after ore grinding, roughing, scavenging and concentrating are respectively carried out twice, so that gold concentrate is finally obtained. Materials and agents adopted by the method in the preprocessing and flotation processes are environmental friendly, easy to prepare and low in cost, so that the method disclosed by the invention is applicable to industrial production.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of resources, in particular to a method for recovering gold by flotation from gold tailings extracted by a biological preoxidation-charcoal slurry method. Background technique [0002] There are a large number of low-grade arsenic-containing fine-grained disseminated refractory gold ores in Southwest my country. More than 75% of the gold in this type of gold ore is wrapped by pyrite and arsenopyrite, and the monomeric and continuous gold is less than 10%. The leaching rate of direct gold cyanide is less than 15%. At present, such gold ores are mainly produced by flotation process, and the obtained gold concentrate is treated by biological pre-oxidation-carbon slurry gold extraction process. The specific production process of biological pre-oxidation-carbon slurry method includes gold concentrate regrinding, biological pre-oxidation, oxidation slag washing, oxidation washing liqui...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B11/00B03D1/00
CPCY02P10/20
Inventor 李正要林蜀勇王金虎王梦成
Owner JIANGXI YIYUAN REGENERATION RESOURCE CO LTD
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