Method for recovering gold by using adsorption resin

An adsorption resin and gold recovery technology, which is applied in the field of hydrometallurgy, can solve the problems of unfavorable environmental protection and general adsorption capacity, and achieve the effects of simple operation, efficient selective recovery, excellent selectivity and reusability

Active Publication Date: 2021-08-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, many researchers also have explored gold recovery by resin, for example, the prior art Chinese patent application "reclaiming gold and palladium in electroplating waste liquid with mercaptoamine type chelating resin" (CN85100240A), although it Can recover gold to a certain extent (adsorption capacity is 1-1.1g / g), but its adsorption capacity is relatively average compared with other adsorption materials
And, in this document, adopt the ashing method to recover the gold of adsorption, because contain sulfur element in the chelating resin, the ashing treatment resin can produce SO 2 and other gases that are likely to cause acid rain, which is not conducive to environmental protection
[0005] Another example is the prior art Chinese patent application "Ion Exchange Recovery Method for Gold, Platinum and Palladium in Acidic Wastewater" (CN101618898A), which is aimed at the leaching wastewater obtained from the leaching treatment of precious metal ores (although the concentration of gold elements is not as good as the directly obtained leaching solution, but the concentration of gold elements is still high), although it can solve the recovery problem of precious metals to a certain extent, because it adopts the anion exchange method, it can only recover the chemical alloys in the solution system.

Method used

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  • Method for recovering gold by using adsorption resin
  • Method for recovering gold by using adsorption resin
  • Method for recovering gold by using adsorption resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1 Nitrogen-containing intermediate and sulfur-containing nitrogen-containing adsorption resin (the total content of nitrogen and sulfur is 37.4%) to the adsorption isotherm test of high-concentration gold

[0058] Weigh 0.01 g of the adsorption resin and put it into 10 mL of aqueous solution containing Au(III) at 35°C for static Batch adsorption experiment. The Au(III) solution in the adsorption experiment was prepared with chloroauric acid. After adsorption at natural pH for a period of time, the supernatant was filtered out with a filter head, and the residual concentration of Au(III) was detected by ICP-OES and its adsorption amount (Q e ).

[0059] The adsorption isotherm of nitrogen-containing intermediate and sulfur-containing nitrogen-containing adsorption resin (the total content of nitrogen and sulfur is 37.4%) to gold is as follows: figure 1 shown. It can be concluded from the figure that compared with the nitrogen-containing intermediate, the sulfu...

Embodiment 2

[0062] Example 2 Nitrogen-containing intermediate and sulfur-containing nitrogen-containing adsorption resin (the total content of nitrogen and sulfur is 37.4%) to the repeated utilization experiment of high-concentration gold

[0063] Weigh 0.01 g of the adsorption resin, and put it into 10 mL of an aqueous solution containing Au(III) at 35°C. After adsorption at natural pH for a period of time, the supernatant was filtered out with a filter head, and the residual concentration of Au(III) was detected by AAS and the recovery rate was calculated. The gold-loaded resin was washed three times with deionized water, and 1mol / L HCl, 0.25mol / L thiourea and 0.5% H were added thereto. 2 o 2Blend the eluents for elution. For each adsorption experiment, the resin was washed three times with deionized water, and then the next cycle was performed. Repeat this five times.

[0064] Nitrogen-containing intermediates and sulfur-containing nitrogen-containing adsorption resin (the total co...

Embodiment 3

[0065] Example 3 Dynamic adsorption experiment of nitrogen-containing intermediate and sulfur-containing nitrogen-containing adsorption resin (the total content of nitrogen and sulfur is 37.4%) recovering gold from simulated wastewater

[0066] Fill the resin into the adsorption column in a wet state. The dynamic adsorption evaluation conditions: the volume of the adsorption column is 3mL, the amount of filled nitrogen-containing intermediate and sulfur-containing nitrogen-containing adsorption resin is 2.4777g and 2.6644g respectively, Au(III), Cu (II), Fe(III), Zn(II)Ni(II) concentration is 0.1mmol / L, flow rate is 1.5mL / min (SV=30h -1 ).

[0067] According to the above experimental conditions, the dynamic adsorption experiment evaluation was carried out, and through sampling and analysis at specific time intervals, it was obtained image 3 the penetration curve. The results show that the nitrogen-containing intermediate and sulfur-containing nitrogen-containing adsorption ...

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Abstract

The invention belongs to the technical field of wet metallurgy, and discloses a method for recovering gold by using adsorption resin. The method for recovering the gold by using the adsorption resin comprises the following steps of: (S1) adjusting the pH value of gold-containing leaching liquid containing gold ions to 1-3, and then adding the adsorption resin to the gold-containing leaching liquid to adsorb the gold ions in the gold-containing leaching liquid, wherein the surface of the adsorption resin has a sulfur element and a nitrogen element, and the contents of the nitrogen element and the sulfur element on the surface of the adsorption resin respectively account for more than 3% and more than 20% of the total mass of the adsorption resin; and (S2) after the adsorption is finished, eluting, concentrating, separating and regenerating the gold loaded on the adsorption resin treated in the step (S1) by adopting an eluent, so as to realize the recovery of the gold. According to the method for recovering the gold by using the adsorption resin, key reaction participants are improved, and the adsorption resin material with high sulfur element content and high nitrogen element content on the surface is applied to recovery of gold and particularly can be applied to recovery of the gold in a low-grade gold-containing material. The method for recovering the gold by using the adsorption resin is easy to operate and suitable for large-scale recovery of low-concentration gold in the leaching liquid.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and more specifically relates to a method for recovering gold by using an adsorption resin. Based on this method, the adsorption resin with high-density sulfur-containing and nitrogen-containing elements on the surface can be used to recover gold from low-grade gold-containing materials. Recovery of gold from low-grade gold-bearing materials, to achieve trace gold recovery from low-grade gold-bearing materials. Background technique [0002] Gold (Au), one of the most important precious metals, is widely used in jewelry, electronic devices, and catalysis due to its unique physical and chemical properties. With the development of science and technology, the demand for gold is increasing day by day, and gold is a non-renewable resource, which needs to be recovered from secondary resources and gold-containing slag to realize the recycling of resources. Scrap gold recycling, as an alternative...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/24
CPCC22B11/04Y02P10/20
Inventor 赵龙张满满
Owner HUAZHONG UNIV OF SCI & TECH
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