Method for preparing elemental gold by utilizing synchronous absorption of persimmon tannins

A technology of elemental gold and persimmon, which is applied in the field of effective extraction of rare and precious metals and preparation of green adsorbents, can solve the problems of high production cost, waste of resources, and only suitable for use, and achieve the effect of simple method, saving raw materials, and short cycle time

Active Publication Date: 2012-11-07
LIAONING UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are three problems in the electrolytic refining gold extraction process as follows: ①It is only suitable for the extraction of gold from gold alloys. If the content of impurity metals is high, the electrolysis process cannot be carried out normally.
②Electrolytic refining operating conditions are relatively strict, and gold is distributed in cathode gold, electrolyte, anode slime and residual electrode, resulting in low direct recovery rate and recovery rate of gold, and the direct recovery rate of gold is only 70%; ③Electrolytic extraction The gold time is long, the processing volume of residual pole return is large, and the backlog of funds is serious
The essence of the solvent extraction method is to extract and separate gold from the chlorinated solution, and then wash and acidify the gold to precipitate gold. The disadvantages of the solvent extraction method are: the extraction agent is easy to emulsify, there are many types of raw materials required, and there are many production equipment. higher production costs
The residue after juicing is either directly discarded or used as fertilizer, resulting in a waste of resources

Method used

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  • Method for preparing elemental gold by utilizing synchronous absorption of persimmon tannins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 The influence of different acidity and other coexisting ions on gold adsorption

[0026] 1) Preparation of gold ion-containing solution: Dissolve a certain amount of chloroauric acid in water, and add copper chloride, ferric chloride, zinc chloride, nickel chloride, palladium chloride and chloroplatinic acid concentrated The solution is prepared as a gold ion solution containing Cu, Fe, Zn, Ni, Pd, Pt metal ions that coexist with gold. The main components in this solution are Au 30ppm, Cu 30ppm, Fe 30ppm, Zn 30ppm, Ni 30ppm, Pd 30ppm, Pt 30ppm;

[0027] 2) Preparation of persimmon tannin adsorbent: Take 20g of persimmon tannin (provided by Jiangxi Jincheng Shibao Co., Ltd.), add sulfuric acid, and acidify at a temperature of 90-100°C for 10 hours; the acidified persimmon tannin Rinse with clear water and dry at room temperature to obtain persimmon tannin adsorbent;

[0028] 3) Adsorption and reduction of gold: Take 100ml of the gold ion-containing solution...

Embodiment 2

[0033] Example 2 Utilize persimmon tannin adsorbent to extract gold in electronic waste

[0034] 1) Preparation of gold ion-containing solution: Dissolve computer circuit board components by chlorination to obtain a gold ion-containing solution. 1.0mol / L;

[0035] 2) Preparation of persimmon tannin adsorbent: Take 20g of persimmon tannin (provided by Jiangxi Jincheng Shibao Co., Ltd.), add sulfuric acid, and acidify at a temperature of 90-100°C for 6 hours; the acidified persimmon tannin Rinse with clear water and dry at room temperature to obtain persimmon tannin adsorbent;

[0036] 3) Adsorption and reduction of gold: Take 500 ml of the gold ion-containing solution prepared above, then add 0.4 g of persimmon tannin adsorbent, stir for 1 hour, and stand still for 3 hours to obtain the adsorption reduction product.

[0037] The adsorption and reduction product was verified as elemental gold according to the method in Example 1, the direct recovery rate of gold was 96%, Au ...

Embodiment 3

[0038] Example 3 Utilize persimmon tannin adsorbent to extract gold in electronic waste

[0039] 1) Gold ion solution: take the chlorinated e-waste solution of alloy components, the main components are Au150ppm, Cu5667ppm, Zn670ppm, Fe1260ppm, Pd 2.3ppm, Pt 3.4ppm, and the acidity is 2.5mol / L;

[0040] 2) Preparation of persimmon tannin adsorbent: take 20g of persimmon tannin (provided by Jiangxi Jincheng Shibao Co., Ltd.), add sulfuric acid, and acidify at a temperature of 90-100°C for 12 hours; the acidified persimmon tannin Rinse with clear water and dry at room temperature to obtain persimmon tannin adsorbent;

[0041]3) Adsorption and reduction of gold: take 500ml of the above-mentioned gold ion-containing solution, then add 0.5g of persimmon tannin adsorbent, and obtain the adsorption reduction product after standing still for 3 hours.

[0042] The adsorption and reduction product was verified as elemental gold according to the method in Example 1, the direct recovery...

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Abstract

The invention relates to a method for preparing elemental gold by utilizing synchronous absorption of persimmon tannins and adopts the technical scheme that the method comprises the following steps of: (1) weighting persimmon tannins, adding sulfuric acid into the persimmon tannins and acidifying the mixture at 90-100 DEG C for 6-12 hours; (2) washing the acidified persimmon tannins with water, and drying at the room temperature to obtain a persimmon tannins absorbing agent; (3) weighting solution containing gold ions, regulating the acidity of the solution, and then adding the persimmon tannins absorbing agent for stirring, standing and absorbing, wherein [H<+>] is 0.1-4mol / L. Gold can be extracted at one step by using the absorbing agent prepared by the invention without energy consumption, energy saving and environment protection are realized, in addition, the absorbing agent is simple in preparation, rich in sources and low in price and has an actual application value.

Description

technical field [0001] The invention belongs to the technical field of effective extraction of rare precious metals and the preparation of green adsorbents, and in particular relates to a kind of persimmon tannin that utilizes simple chemical treatment to selectively and effectively adsorb trivalent gold from a solution containing gold ions and impurity metal ions. And it can be directly reduced to the method of elemental gold. Background technique [0002] Gold is a metal discovered and utilized by humans earlier. Because of its rarity, specialness and preciousness, it has been regarded as the head of hardware since ancient times, and has the title of "King of Metal". It enjoys a reputation unmatched by other metals, and its prominent position is almost eternal. Gold has extremely high stability against corrosion; good electrical conductivity and thermal conductivity; the nucleus of gold has a large effective cross-section for capturing neutrons; the ability to reflect inf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/24C02F1/28C02F1/62B01J20/24B01J20/30C22B11/00
CPCY02P10/20
Inventor 熊英王磊
Owner LIAONING UNIVERSITY
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