A kind of preparation method and application of modified silica gel material

Abstract

The invention discloses a preparation method and application of a modified silica gel material, belonging to the technical field of silica gel. The method of the present invention overcomes the shortcomings of using organic solvents and taking a long time in the common silica gel modification method, shortens the modification time while ensuring the modification effect, and avoids the use of organic solvents; the method of the present invention Using silica gel as the substrate, the modifying agent is transported to the surface of silica gel in the form of gas under certain conditions, so that the surface properties of silica gel change, thereby obtaining modified silica gel material. In addition, the silica gel material modified by the mercapto-containing silane coupling agent prepared by the present invention has a good effect on [Au(S 2 o 3 ) 2 ] 3‑ Complex ions have an adsorption effect and can effectively recover gold in the thiosulfate gold leaching solution. The method of the invention does not use organic solvents, effectively avoids the environmental problems caused by the use of organic solvents, shortens the modification time, reduces the time cost and expense in practical applications, 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...

Examples

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 ...

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...

Examples

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 ...