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Preparation method and application of activated carbon for recycling gold

A technology of activated carbon preparation and activated carbon, which is applied in the direction of chemical instruments and methods, improvement of process efficiency, and other chemical processes. Simple, Inexpensive Effects

Active Publication Date: 2015-04-29
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its biggest disadvantage is that the adsorption process cannot avoid the highly toxic CN - Into the technological process, the purpose of non-toxicity cannot be achieved, the technology is immature and cannot be applied to actual production

Method used

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  • Preparation method and application of activated carbon for recycling gold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Take 3g of granular activated carbon, wash with deionized water, remove powder dust, filter, and bake at 106°C for 12h;

[0026] (2) The activated carbon dried in step (1) was impregnated with copper (Cu 2+ ) solution at room temperature (stirring speed: 50 r / min) for 4 h; then pour out the supernatant, wash with deionized water, filter, and bake at 80°C for 4 h;

[0027] (3) Immerse the activated carbon dried in step (2) in the proportion of 100g / L in the potassium ferrocyanide solution with a concentration of 0.02 mol / L and stir at room temperature (stirring speed is 50 r / min) for 4 h Then pour out the supernatant, wash with deionized water, and filter; bake at 106°C for 12 h to prepare the final activated carbon product for later use;

[0028] (4) Taking a leaching solution of waste electronic components with a gold content of about 105 g / t as an example, the leaching solution contains dithiosulfuric acid alloy (Ⅰ) ([Au(S 2 o 3 ) 2 ] 3- ) concentration is 2m...

Embodiment 2

[0030] (1) Take 3g of columnar activated carbon, wash with deionized water, remove powder dust, filter, and bake at 110°C for 1h;

[0031] (2) The activated carbon dried in step (1) was impregnated in Ag-containing (Ag + ) solution at room temperature (stirring speed: 100 r / min) for 2 hours; then pour out the supernatant, wash with deionized water, filter, and bake at 90°C for 1 hour;

[0032] (3) Immerse the activated carbon dried in step (2) in the proportion of 500g / L in the potassium ferrocyanide solution with a concentration of 0.02 mol / L and stir at room temperature (stirring speed is 150r / min) for 2h; then Pour out the supernatant, wash with deionized water, and filter; bake at 100°C for 5 hours to prepare the final activated carbon product for use;

[0033] (4) Add 1 g of activated carbon obtained in step (3) into the simulated thiosulfate gold leaching solution, which contains [Au(S 2 o 3 ) 2 ] 3- The concentration is 100ppm, the pH value is 5, and after 24 hours...

Embodiment 3

[0035] (1) Take 3g of granular coconut shell activated carbon and wash it with deionized water to remove powder dust, filter, and bake at 100°C for 6 hours;

[0036] (2) The activated carbon dried in step (1) is impregnated in the concentration of 0.005mol / L containing Cd (Cd 2+ ) solution at room temperature (stirring speed: 250r / min) for 0.5h; then pour out the supernatant, wash with deionized water, filter, and bake at 100°C for 12h;

[0037] (3) Immerse the activated carbon dried in step (2) in the proportion of 250g / L in the potassium ferrocyanide solution with a concentration of 0.005mol / L and stir at room temperature (stirring speed is 200 r / min) for 3 hours; Then pour out the supernatant, wash with deionized water, and filter; bake at 110°C for 1 hour to prepare the final activated carbon product for later use;

[0038] (4) Taking an ore leaching solution with a gold content of about 2.67 g / t as an example, the leaching solution contains dithiosulfuric acid alloy (I) ...

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Abstract

The invention discloses a preparation method and application of activated carbon for recycling gold and belongs to the field of wet metallurgy and precious-metal recovery. The method disclosed by the invention comprises the following steps: weighing a certain amount of activated carbon, washing to remove ash in the activated carbon by using deionized water, filtering and drying; stirring and dipping the activated carbon at normal temperature by using a transition metal salt solution, washing, filtering and drying; stirring and dipping at normal temperature by using ferrous cyanate ([Fe(CN)6]4-) salt solution in a certain concentration range, generating a Prussian blue analogue compound on the surface of the activated carbon, washing and filtering; and drying the filtered activated carbon for later use. According to the activated carbon prepared by the method, gold ([Au(S2O3)2]3-) in thiosulfate solution can be recycled, the highest recovery rate can be 100 percent, and the maximum capacity of the activated carbon can be 1.27kg / t.

Description

technical field [0001] The invention relates to a preparation method and application of activated carbon for recovering gold, and belongs to the fields of hydrometallurgy and precious metal recovery. Background technique [0002] Carbon pulp method (CIL) or carbon impregnation method (CIP) has been used in the cyanide extraction process for more than 60 years, but the cyanide in this method is easy to cause environmental pollution and ecological damage, and some countries and regions have banned the use of cyanide Chemical gold extraction. Among the cyanide replacement reagents that have been studied, the thiosulfate gold extraction method has the characteristics of low toxicity, environmental friendliness, wide application range, and fast gold leaching speed, and is regarded as the most promising method for industrial application. Due to the [Au(S 2 o 3 ) 2 ] 3- High charge, large volume, steric effect of molecular structure, coordination group or special reaction with...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C22B7/00C22B11/00
CPCB01J20/20C22B11/042B01J20/3204B01J20/3234Y02P10/20
Inventor 胡显智余洪字富庭何素琼杨保民聂彦合王强迟衡
Owner KUNMING UNIV OF SCI & TECH
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