A kind of metal leaching agent and gold leaching method based on ionic liquid

A technology of ionic liquid and leaching agent, which is applied in the field of metal leaching agent, can solve the problem of not much research on the extraction of simple precious metals, and achieve the effects of good oxidation and coordination ability, mild conditions, and low overall energy consumption

Active Publication Date: 2022-07-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Although ionic liquids have been deeply studied and widely used in the extraction of metal ions, there is not much research on the extraction of elemental noble metals by ionic liquids.

Method used

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  • A kind of metal leaching agent and gold leaching method based on ionic liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Before the experiment, the initiator of the synthesis reaction needs to be prepared. Sodium persulfate is added to the distilled water at one time and heated slowly. The reaction temperature is 15-25°C, and the reaction time is 4-10h. For example, it can be stirred at 20°C for 4 hours. Then do the following experiment:

[0040] 1. Mix 3.2g of benzoic acid and 14.4g of methanesulfonic acid into a 50ml three-necked flask, and heat under reflux to stabilize at 40°C;

[0041] 2. After 1) is stable, add sodium persulfate with a concentration of 20% to 1) dropwise, adding a total of 3.2g dropwise, the temperature should always be stable at 40°C during the dropwise addition, and heated to reflux for 5h;

[0042] 3. After refluxing for 5 hours, after cooling, the reaction solution was treated with 10 g of ice and saturated ammonium sulfate.

[0043] 4. The obtained product was extracted with dichloromethane, then washed with saturated ammonium sulfate and finally dried over m...

Embodiment 2

[0047] Peroxybenzoic acid, water, and 1-butyl-2,3-dimethylimidazolium chloride by mass ratio 1:1:2, get 3g 1-butyl-2,3-dimethylimidazolium chloride, 1.5g of peroxybenzoic acid and 1.5ml of water were mixed uniformly at room temperature to obtain 3.5ml of solution, 0.0046g of palladium powder was added, and the mixture was heated and stirred at 60° C. The palladium powder was completely dissolved in 15 minutes.

[0048] The Pd concentration of the solution was determined by atomic absorption spectrometer to be 1.302ug / ml, and the calculated dissolution rate was 99.07%.

Embodiment 3

[0050] Peroxybenzoic acid, water and 1-hexyl-3-methylimidazole dicyandiamide salt are in a mass ratio of 1:1:2, take 3g 1-hexyl-3-methylimidazole dicyandiamide salt, 1.5g peroxybenzoic acid Mix well with 1.5 ml of water at room temperature to obtain 3.3 ml of solution, add 0.0045 g of palladium powder, heat and stir at 60° C., and the palladium powder is completely dissolved in 15 minutes.

[0051] The Pd concentration of the solution was determined to be 1.228ug / ml by atomic absorption spectrometer, and the calculated dissolution rate was 99.07%.

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Abstract

The invention discloses an ionic liquid-based metal leaching agent and a gold leaching method. The ionic liquid-based metal leaching agent is formed by mixing peroxybenzoic acid, water and ionic liquid in a ratio of 1:0.3-3:2-5 by mass, and the ionic liquid is 1-hexyl-3-methyl imidazolium chloride, 1-butyl-2,3-dimethylimidazolium chloride or 1-hexyl-3-methylimidazolium dicyandiamide. The invention provides a gold leaching method based on the metal leaching agent, capable of leaching precious metals such as gold, palladium, platinum, rhodium, etc., with fast leaching speed and high extraction rate.

Description

(1) Technical field [0001] The invention relates to an ionic liquid metal leaching agent and a gold leaching method based on the metal leaching agent. (2) Background technology [0002] Precious metals have stable properties and good electrical conductivity. They are widely used in jewelry, currency, electronic information, aerospace and chemical industries. They are an indispensable and important resource in the development of modern industry and technology. Precious metals occupy a particularly important position in many fields such as national economy and industrial production due to their good stability, strong ductility, good catalytic activity, small size, corrosion resistance, high temperature resistance and other properties that other metals cannot match. However, precious metals are scarce in nature, and most of them coexist with other metals. Therefore, we have been pursuing the goal of constantly exploring the separation and recovery methods of precious metals tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/16C22B11/00
CPCC22B3/1675C22B11/04Y02P10/20
Inventor 丰枫赵明星王海欣丁和达张佳颖张群峰卢春山郭伶伶李小年
Owner ZHEJIANG UNIV OF TECH
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