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Preparation method and application of cyclic mercaptan-modified activated carbon

A technology with cyclic thiol and activated carbon, applied in chemical instruments and methods, improvement of process efficiency, inorganic chemistry and other directions, can solve the problems of high toxicity of copper cyanide complex ions, difficulty in process amplification, failure to achieve no cyanide, etc. The effect of meeting industrial production requirements, simple preparation process and low modification cost

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, the copper cyanide ion itself is highly toxic, and in CN - It can only exist under the condition of high concentration, and it is inevitable to let the highly toxic CN - Into the technological process, can not achieve the purpose of cyanide-free
Others (see document CN104549147 A for details) load Prussian blue-like compounds on activated carbon. This reagent is non-toxic and has good adsorption effect. Control, process scale-up is difficult, need further improvement
In addition, none of them involve the continuous adsorption problem necessary in actual production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A preparation method of ring mercaptan modified activated carbon, specifically comprising the following steps:

[0018] (1) Take 2g of granular activated carbon, wash with deionized water to remove powder dust, filter, and bake at 100°C for 12h.

[0019] (2) Put the activated carbon dried in step (1) in the 2-mercaptobenzoxazole solution with a concentration of 1g / L according to the liquid-solid ratio (mL:g) of 50, soak at room temperature for 24 hours, filter After drying, save for later use.

[0020] Prepare three 100mL 10ppm Au(S 2 o 3 ) 2 3- Solution (referred to as the adsorption solution), adjust the pH value to 8 before adsorption; take 1g of activated carbon obtained in step (2) and add it to the first adsorption solution, filter after 24 hours of adsorption, and then add it to the second adsorption solution for adsorption. Adsorbed for 24 hours; filtered and then added to the third adsorption solution for adsorption, adsorption for 24 hours (continuous ads...

Embodiment 2

[0022] A preparation method of ring mercaptan modified activated carbon, specifically comprising the following steps:

[0023] (1) Take 3g of powdered activated carbon, wash with deionized water, filter, and bake at 100°C for 12h.

[0024] (2) According to the ratio of liquid to solid (mL:g) of 30, dry the product in step (1)

[0025] Activated carbon was placed in 2-mercaptobenzimidazole acetone solution with a concentration of 10g / L, stirred at room temperature (stirring speed was 100rpm) for 2h; filtered, dried, and stored for later use.

[0026] Prepare 100mL of Au(S) with a concentration of 100ppm 2 o 3 ) 2 3- solution (referred to as the adsorption solution), adjust the pH value to 9 before adsorption; take 0.5g of activated carbon obtained in step (2) and add it to the simulated thiosulfate gold leaching solution, and the adsorption rate is 43.1% after 48 hours of adsorption. The loading capacity is 8.62kg / t.

Embodiment 3

[0028] A preparation method of ring mercaptan modified activated carbon, specifically comprising the following steps:

[0029] (1) Take 3g of powdered activated carbon, wash with deionized water, filter, and bake at 100°C for 12h.

[0030] (2) According to the liquid-solid ratio (mL:g) of 40, place the activated carbon dried in step (1) in the ethanol solution of benzyl mercaptan with a concentration of 8g / L, and stir at room temperature (stirring speed is 100rpm) for 0.5h, filtered, dried, and stored for later use.

[0031] Prepare 100mL of Au(S) with a concentration of 100ppm 2 o 3 ) 2 3- solution (referred to as the adsorption solution), adjust the pH value to 12 before adsorption; take 0.5g of activated carbon obtained in step (2) and add it to the simulated thiosulfate gold leaching solution, and the adsorption rate is 46% after 48 hours of adsorption. The loading capacity is 9.2kg / t.

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Abstract

The invention discloses a preparation method and an application of cyclic mercaptan-modified activated carbon and belongs to the technical field of precious metal recovery. According to the method disclosed by the invention, cyclic mercaptan is adopted as an activated carbon modifier and the activated carbon is modified by using an impregnation method to adsorb Au(S2O3)2<3-> in a solution. The method disclosed by the invention has the beneficial effects that the problem of cyanide pollution of a conventional method of adsorbing and recovering the Au(S2O3)2<3-> by using copper cyanide ion (Cu(CN)4<2->)-supported activated carbon, complicated modification process of a method of adsorbing and recovering the Au(S2O3)2<3-> by using prussian blue-supported activated carbon and difficulty in continuous adsorption and the like are solved; the modified activated carbon prepared by adopting the method disclosed by the invention can effectively adsorb gold in thiosulfate gold leaching; and the activated carbon has the advantages of multilevel adsorption capacity and the like.

Description

technical field [0001] The invention relates to a preparation method and application of a cyclic mercaptan-modified activated carbon, which belongs to the technical field of precious metal recovery. Background technique [0002] Thiosulfate gold extraction technology has the advantages of non-toxic, environmentally friendly, suitable for processing refractory gold ores containing copper, arsenic, antimony, carbon, etc., and no corrosion to equipment, so it is considered to be the most industrialized prospect Non-toxic gold extraction technology. With the increasing complexity of gold ores and the improvement of environmental protection requirements, the thiosulfate gold extraction method has become the preferred technology for gold extraction; however, due to the influence of activated carbon on Au(S 2 o 3 ) 2 3－ The adsorption capacity of the method is extremely low, and the CIP method commonly used in cyanidation gold extraction cannot be used, which leads to the econo...

Claims

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Application Information

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IPC IPC(8): B01J20/30B01J20/32B01J20/20B01D15/08C01B32/36C22B7/00C22B11/00
CPCB01D15/08B01J20/20C22B7/00C22B11/00C01B32/36B01J20/30B01J20/3225Y02P10/20
Inventor 字富庭陈云龙胡显智杨朋王强刘洋陈树梁王朝武何易何朴强林玥
Owner KUNMING UNIV OF SCI & TECH
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