Preparation method and application of modified activated carbon for recovering gold

A technology for activated carbon and gold recovery, which is applied in the field of precious metal recovery and hydrometallurgy. It can solve the problems of destroying the porous structure of activated carbon, low adsorption capacity of complex ions, and low loading capacity of activated carbon. It achieves good adsorption effect, rich surface properties and low price. Effect

Active Publication Date: 2019-04-09
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the thiosulfate gold extraction process, the activated carbon on [Au(S 2 o 3 ) 2 ] 3- The complex ion adsorption capacity is extremely low, which may be attributed to the large volume, high charge, and low affinity of the gold thiosulfate complex ion to activated carbon, resulting in difficult adsorption.
[0003] In order to overcome the shortcoming of the low loading capacity of activated carbon, someone adds 1-2 times the amount of cyanide in the thiosulfate gold leaching solution, and [Au(S 2 o 3 ) 2 ] 3- Convert to [Au(CN) 2 ] - It can be effectively adsorbed by activated carbon. Although the effect of this method is good, it cannot avoid the highly toxic CN - Pollution
Patent CN 104549147 A l

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Take 1g of activated carbon, wash it with deionized water, remove the activated carbon dust, and bake it at 70°C for 12h.

[0018] (2) According to the mass ratio of 3:1, mix 3g of thiourea and 1g of activated carbon, place it in a high-pressure reactor, and fill it with nitrogen to seal it.

[0019] (3) Place the reaction kettle in step (2) at 160°C for constant temperature reaction for 8 hours, then cool; take out the solid mixture, wash the activated carbon with ethyl acetate, remove the residue on the surface, and dry it in vacuum at 100°C for 4 hours to prepare a Thiourea modified activated carbon, save for future use.

[0020] Taking an ore leaching solution with a gold content of about 2.67 g / t as an example, the leaching solution contains Au(S 2 o 3 ) 2 3- The concentration is 8mg / L, Cu 2+ The concentration is 5mmol / L, NH 3 / NH 4 + The concentration is 3mol / L, and the pH is 11.0; take 1g of activated carbon obtained in step (3) and add it to 100ml of...

Embodiment 2

[0022] (1) Take 1g of granular activated carbon, wash it with deionized water, remove powder dust, filter, and bake at 70°C for 8h.

[0023] (2) According to the mass ratio of 5:1, mix 5g of thiourea and 1g of activated carbon, place it in a high-pressure reactor, and fill it with nitrogen to seal it.

[0024] (3) Put the reaction kettle of step (2) at 150°C for constant temperature reaction for 10 hours, then cool it down; take out the solid mixture, wash the activated carbon with ethanol, remove the residue on the surface, and dry it in vacuum at 70°C for 8 hours to prepare a sulfur Urea modified activated carbon, save for future use.

[0025] Get 1g of the modified activated carbon obtained in step (3) and place it in 100ml simulated thiosulfate gold leaching solution, adjust its pH to 10.0, which contains [Au(S 2 o 3 ) 2 ] 3- , stirred and adsorbed at 180 r / min at room temperature for 24 hours, the recovery rate of gold was 25%, and the loading capacity was 2.5kg / t.

Embodiment 3

[0027] (1) Take 1g of activated carbon, wash it with deionized water, remove powder dust, filter, and bake at 80°C for 5h.

[0028] (2) According to the mass ratio of 1:1, mix 1g of thiourea and 1g of activated carbon, place it in a high-pressure reactor, and fill it with nitrogen to seal it.

[0029] (3) Put the reaction kettle in step (2) at 250°C for 2 hours at a constant temperature, then cool down; take out the solid mixture, wash the activated carbon with ethanol, remove the residue on the surface, and dry it in vacuum at 70°C for 12 hours to prepare an amino sulfur Urea modified activated carbon, save for future use.

[0030] Taking an ore leachate with a gold content of about 1.39 g / t as an example, the leachate contains Au(S 2 o 3 ) 2 3- The concentration is 11 mg / L, Cu 2+ The concentration is 10mmol / L, NH 3 / NH 4 + The concentration is 3mol / L, and the pH is 11.0; take 1g of activated carbon obtained in step (3) and place it in 100ml of thiosulfate leaching so...

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Abstract

The invention discloses a preparation method and application of modified activated carbon for recovering gold and belongs to the fields of wet metallurgy and precious metal recovery. According to themethod, a modified activated carbon material is prepared under a certain condition by taking an activated carbon material as a matrix and thiourea as a modifier; and functional groups containing atomssuch as nitrogen, oxygen and sulfur are introduced to the surface of activated carbon, so that the properties on the surface of the material are changed, and [Au(S2O3)2]3-complex ions in a thiosulfate gold immersion solution are effectively adsorbed. By using the method disclosed by the invention, the defects that existing Prussian blue-like compound modified activated carbon is complex in preparation process and unstable in product structural performances and expensive modifiers and organic solvents are used by 2-mercaptophenylthiazole modified activated carbon are overcome; and the preparation method has the advantages such as simple preparation method, low price and environment friendliness.

Description

technical field [0001] The invention relates to a preparation method and application of modified activated carbon for gold recovery, belonging to the fields of hydrometallurgy and precious metal recovery. Background technique [0002] Because of its unique physical and chemical properties, gold plays a pivotal role in human production and life. Cyanide method has always been the main gold leaching technology for gold extraction, but highly toxic cyanide is easy to leak, and if it is not handled properly, it will cause serious damage to the environment and ecology. Therefore, the non-cyanide gold extraction technology has been developed; among them, the thiosulfate gold extraction technology is non-toxic, less polluting, low in cost, high in reaction selectivity, low in corrosiveness of the leachate, and easy to handle. The advantages of carbonaceous gold ore, copper-bearing gold ore and complex sulfur-bearing gold ore are considered to be the most promising alternative tech...

Claims

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Application Information

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IPC IPC(8): B01J20/30B01J20/20B01D15/08C01B32/36C22B7/00C22B11/00
CPCB01D15/08B01J20/20C22B7/00C22B11/00C01B32/36Y02P10/20
Inventor 字富庭王朝武陈云龙王强秦雪聪陈树梁胡显智杨朋何易
Owner KUNMING UNIV OF SCI & TECH
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