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A kind of silver solution and preparation method thereof

A technology of silver solution and liquid, applied in the field of silver solution and its preparation, can solve the problems of insoluble, environmental pollution, high toxicity, etc., and achieve the effect of simple process

Active Publication Date: 2021-08-31
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the physical and chemical properties of silver are relatively stable and difficult to dissolve, usually requiring the use of cyanide or strong acid / strong oxidant combination reagents to dissolve
Therefore, in the wet smelting process of natural silver mines, a large amount of highly toxic and strongly acidic wastewater is usually produced, resulting in serious environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 0.2g of pure silver powder and add it to 9.8g of 1-allyl-3 methylimidazolium chloride (AmimCl) ionic liquid, stir at 100°C for 10min, then add 2mL of 30% hydrogen peroxide solution therein, stir for 30min, and obtain the mass Concentration 2% Ag / AmimCl solution.

Embodiment 2

[0027] Weigh 0.5g of pure silver powder and add it to 9.5g of 1-butyl-3-methylimidazolium acetate (BmimAc) ionic liquid, stir at 100°C for 10min, then add 3mL of 30% hydrogen peroxide solution therein, and stir for 30min to obtain the mass Concentration 5% Ag / BmimAc solution.

Embodiment 3

[0029] After weighing 0.5g of silver nuggets and pulverizing them, add them into 4.5g of 1-butyl-3-methylimidazolium chloride (BmimCl) ionic liquid, stir at 120°C for 10min, then add 3mL of 30% hydrogen peroxide solution therein, and stir for 1h. A 10% Ag / BmimCl solution with a mass concentration was obtained.

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PUM

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Abstract

The invention discloses a silver solution and a preparation method thereof. The silver solution includes silver element and ionic liquid, and the mass concentration of silver element in the silver solution is 0.01-40%. Silver is added to the ionic liquid and / or the ionic liquid / organic solvent mixed solvent, an oxidizing agent is added thereto, and the reaction is stirred to obtain the silver solution. Under the condition of no acid and no cyanide, the present invention realizes the dissolution of silver by using oxidants such as ionic liquid, hydrogen peroxide and ozone for the first time to prepare silver solution. The preparation method of the silver solution is simple, efficient and environment-friendly.

Description

technical field [0001] The invention belongs to the fields of metal smelting and green chemistry, and relates to a silver solution and a preparation method thereof. Background technique [0002] Silver is an important precious metal, which not only has high economic value, but also has important applications in the fields of catalysis, antibacterial, degradation, and biomedicine. However, the physical and chemical properties of silver are relatively stable and difficult to dissolve, usually requiring the use of cyanide or strong acid / strong oxidant combination reagents to dissolve. Therefore, a large amount of highly toxic and strongly acidic wastewater is usually produced during the hydrometallurgy process of natural silver mines, resulting in serious environmental pollution. It is of great significance for the utilization and development of silver and the smelting of silver ore to develop environmentally friendly and easy-to-use solvents and methods to dissolve silver. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00
CPCC22B11/04
Inventor 张金明万纪强张军
Owner INST OF CHEM CHINESE ACAD OF SCI