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Preparation method and application of 2-mercaptobenzothiazole modified activated carbon

A technology of mercaptobenzothiazole and activated carbon, which is applied in the field of precious metal recovery and hydrometallurgy, can solve the problems of difficult continuous adsorption and complex modification process, and achieve the effects of low modification cost, good adsorption effect and high recovery rate

Active Publication Date: 2017-09-29
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of preparation method of 2-mercaptobenzothiazole modified activated carbon, promptly adopt 2-mercaptobenzothiazole as activated carbon modifier, dissolve 2-mercaptobenzothiazole with organic solvent or strong alkali solution, 2-Mercaptobenzothiazole modified activated carbon was prepared by impregnation method; this method improves the Au(S 2 o 3 ) 2 3－ It can effectively adsorb the gold in the thiosulfate gold leaching solution, and no cyanide (CN) is used in the whole modification process - ) or heavy metals and other toxic substances; overcome the existing activated carbon-loaded copper cyanide complex ions (Cu(CN) 4 2- ) Adsorption and recovery of Au(S 2 o 3 ) 2 3－ Existing cyanide pollution and loaded Prussian blue exist complex modification process, difficult to continuous adsorption and other shortcomings; the preparation process of the modified activated carbon of the present invention is simple, and the prepared activated carbon has multiple adsorption capacity; and the solvent and 2-mercaptobenzo All thiazoles can be fully recovered, recycled for many times, no toxic waste is emitted, and environmentally friendly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: the preparation and application method of 2-mercaptobenzothiazole modified activated carbon are as follows:

[0018] (1) Take 2g of granular activated carbon, wash with deionized water, remove powder dust, filter, and bake at 40°C for 12h;

[0019] (2) According to the ratio of liquid-solid ratio (mL:g) to 10, the activated carbon dried in step (1) is placed in a 2-mercaptobenzothiazole acetone solution with a concentration of 1 g / L, and immersed at room temperature for 6 hours, After filtering and drying, drying at 30 °C for 12 h to obtain 2-mercaptobenzothiazole modified activated carbon, which was stored for future use;

[0020] (3) Prepare three 100mL 10ppm Au(S 2 O 3 ) 2 3- Solution (abbreviated as adsorption solution), adjust the pH value to 8 before adsorption; take 1 g of activated carbon obtained in step (2) and add it to the first part of the adsorption solution, filter after 24 hours of adsorption, and then add it to the second part of the a...

Embodiment 2

[0021] Embodiment 2: the preparation and application method of 2-mercaptobenzothiazole modified activated carbon are as follows:

[0022] (1) Take 3g of powdered activated carbon, wash with deionized water, filter, and bake at 110°C for 1h;

[0023] (2) According to the ratio of liquid-solid ratio (mL:g) to 5, the activated carbon dried in step (1) is placed in a 2-mercaptobenzothiazole ethanol solution with a concentration of 10g / L, and stirred at normal temperature (stirring). The speed is 100rpm) for 2h; then the supernatant is poured out, filtered, dried at 80°C for 2h, and stored for later use;

[0024] (3) Prepare 100mL of Au(S) with a concentration of 100ppm 2 O 3 ) 2 3- Solution (abbreviated as adsorption solution), adjust the pH value to 10 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 15% after 48 hours of adsorption. The load is 3.0kg / t.

Embodiment 3

[0025] Embodiment 3: the preparation and application method of 2-mercaptobenzothiazole modified activated carbon are as follows:

[0026] (1) Take 2g of granular coconut shell activated carbon, wash with deionized water, filter, and bake at 110 °C for 1 hour;

[0027] (2) According to the ratio of liquid-solid ratio (mL:g) of 2, the activated carbon dried in step (1) is immersed in a sodium hydroxide solution (hydrogen The concentration of sodium oxide solution is 0.2mol / L) and immersed at room temperature for 25h; then the supernatant was poured out, washed with deionized water, filtered, dried at 60°C for 12h, and stored for later use;

[0028] (3) Taking an ore leaching solution with a gold content of about 2.67 g / t as an example, the Au(S 2 O 3 ) 2 3- The concentration of 12mg / L, Cu 2+ Concentration is 5mmol / L, NH 3 / NH 4 + The concentration is 3 mol / L and the pH is 11; prepare three 100 mL portions of this leachate, take 1g of step (2) activated carbon and add it ...

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Abstract

The invention discloses a preparation method and application of 2-mercaptobenzothiazole modified activated carbon, belonging to the fields of wet metallurgy and precious metal recovery. The preparation method comprises the steps of dissolving 2-mercaptobenzothiazole as an activated carbon modifying agent with an organic solvent or a strong base solution, and preparing 2-mercaptobenzothiazole modified activated carbon by virtue of an impregnation method, wherein the 2-mercaptobenzothiazole modified activated carbon is used for adsorbing Au(S2O3)2<3->. According to the preparation method, the disadvantages that cyanogen is polluted during adsorption recovery of activated carbon supported copper cyanide complex ions (Cu(CN)4<2->), a modifying process of loaded prussian blue is complicated, and continuous adsorption is difficultly realized, and the like are solved; the modified activated carbon is capable of adsorbing gold in thiosulfate gold leaching and has the advantages of multistage adsorption capacity and the like.

Description

technical field [0001] The invention relates to a preparation method of 2-mercaptobenzothiazole modified activated carbon and the adsorption recovery of Au(S) of the 2-mercaptobenzothiazole modified activated carbon 2 O 3 ) 2 3－ The application of complex ions belongs to the fields of hydrometallurgy and precious metal recovery. Background technique [0002] Thiosulfate gold extraction technology has the advantages of non-toxicity, environmental protection, suitable for processing copper, arsenic, antimony, carbonaceous and other refractory gold ores by cyanidation, and no corrosion to equipment, and is considered to be the most industrialized prospect. Non-toxic gold extraction technology. With the increasing complexity of gold ore and the improvement of environmental protection requirements, thiosulfate gold extraction has become the preferred technology for gold extraction; 2 O 3 ) 2 3－ The adsorption capacity of cyanide is extremely low, and the CIP method common...

Claims

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Application Information

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IPC IPC(8): C01B32/354B01J20/20B01J20/32C22B3/24C22B11/00
CPCB01J20/20C22B3/24C22B11/04B01J20/3251Y02P10/20
Inventor 字富庭陈云龙胡显智杨朋成会玲聂彦合王强
Owner KUNMING UNIV OF SCI & TECH
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