Preparation method and application for modified silica gel material

A silica gel modification technology, which is applied in the field of preparation of modified silica gel materials, can solve the problems of limited application, adsorption selectivity and poor adsorption capacity, and achieve the effects of low modification cost, good adsorption effect and stable properties

Active Publication Date: 2019-04-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adsorption properties of silica gel mainly come from the abundant silanol on its surface, but its adsorption selectivity and adsorption capacity are poor, and it can react with alkali, which limits its application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of a modified silica gel material, specifically comprising the following steps:

[0021] (1) Weigh 2g of granular silica gel, wash with deionized water to remove impurities of silica gel, filter and dry.

[0022] (2) Add the silica gel obtained in step (1) into the hydrochloric acid solution with a concentration of 6mol / L at a ratio of 20g / L, soak for 24h, filter, wash until neutral, and dry at 60°C for 24h.

[0023] (3) Add 5ml of (3-mercaptopropyl)trimethoxysilane and 0.1ml of triethylamine to the lining of the autoclave in sequence, then put the silica gel obtained in step (2) into the crucible, and then place the crucible in the reaction In the inner lining of the kettle, the silica gel and the silane coupling agent are not in direct contact, and are sealed.

[0024] (4) Put the reactor in step (3) at 260°C for 4 h, take it out, and cool it down naturally.

[0025] (5) Put the silica gel obtained in step (4) into a vacuum oven at 80°C for 2 ho...

Embodiment 2

[0028] A preparation method of a modified silica gel material, specifically comprising the following steps:

[0029] (1) Weigh 2 g of column chromatography silica gel, wash with deionized water, remove silica gel impurities, filter and dry.

[0030] (2) Add the silica gel obtained in step (1) into the hydrochloric acid solution with a concentration of 6mol / L at a ratio of 90g / L, soak for 18h, filter, wash until neutral, and dry at 120°C for 18h.

[0031] (3) Add 0.2ml of (3-mercaptopropyl)triethoxysilane and 0.1ml of ethylenediamine to the inner lining of the autoclave in sequence, then put the silica gel obtained in step (2) into the crucible, and then place the crucible In the lining of the reaction kettle, the silica gel and the silane coupling agent are not in direct contact, and are sealed.

[0032] (4) Place the reactor in step (3) at 120°C for 8 h, then take it out and let it cool down naturally.

[0033] (5) Put the silica gel obtained in step (4) into a vacuum oven ...

Embodiment 3

[0036] A preparation method of a modified silica gel material, specifically comprising the following steps:

[0037] (1) Weigh 2g of powdered silica gel, wash with deionized water, remove the impurities of silica gel, filter and dry.

[0038] (2) Add the silica gel obtained in step (1) into the hydrochloric acid solution with a concentration of 6mol / L at a ratio of 150g / L, soak for 6h, filter, wash until neutral, and dry at 180°C for 12h.

[0039] (3) Add 5ml of (3-mercaptopropyl)diethoxysilane and 0.1ml of ammonia water to the inner lining of the autoclave in sequence, then put the silica gel obtained in step (2) into the crucible, and then put the crucible into the reaction kettle In the inner lining, the silica gel and the silane coupling agent are not in direct contact, and are sealed.

[0040] (4) Place the reactor in step (3) at 200°C for 0.5 h, take it out, and cool it down naturally.

[0041] (5) Put the silica gel obtained in step (4) into a vacuum oven at 80°C for ...

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Abstract

The invention discloses a preparation method and an application for a modified silica gel material, belonging to the technical field of silica gel. The method provided by the invention overcomes the disadvantages of the need of using an organic solvent and large time consumption in a common silica gel modification method, guarantees the effect of modification, shortens the time of modification atthe same time, and avoids the use of the organic solvent. With the method provided by the invention, the silica gel is used as a substrate; a modifying agent is conveyed to the surface of the silica gel in a form of gas under certain conditions; the surface properties of the silica gel generate changes; thus, the modified silica gel material is obtained. In addition, a sulfhydryl-containing silanecoupling agent modified silica gel material prepared by using the method provided by the invention has an adsorption effect on [Au(S2O3)2]3- complex ions, and can effectively recover gold in a thiosulfate gold leaching solution. The method provided by the invention does not use the organic solvent, effectively avoids the environmental problems caused by the use of the organic solvent, shortens the time of modification, reduces time cost and expenses in practical application, and has broad application prospects.

Description

technical field [0001] The invention relates to a preparation method and application of a modified silica gel material, belonging to the fields of hydrometallurgy and metal recovery. Background technique [0002] As a rare and precious metal that symbolizes human wealth, gold is often associated with minerals such as quartz, pyrite and arsenite in nature, and its properties are stable. When using the cyanide method to extract gold, due to the extremely high toxicity of cyanide itself, its use has been affected. Therefore, thiosulfate gold extraction technology has attracted much attention as a non-toxic gold extraction technology that may replace cyanidation. However, in the thiosulfate gold extraction technology, it is difficult to recover gold from the gold leaching solution, which limits its development. When the carbon slurry method (CIL) or carbon leaching method (CIP) in the cyanide extraction process is applied to the recovery of gold in the thiosulfate method, acti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30B01D15/08C22B7/00C22B11/00
CPCB01D15/08B01J20/103C22B7/00C22B11/00Y02P10/20
Inventor 字富庭陈树梁胡显智陈云龙刘洋杨朋胡德琼何易
Owner KUNMING UNIV OF SCI & TECH
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