CN-117551874-B - Method for selectively adsorbing and enriching gold ions from multi-metal elements

Abstract

The invention relates to the technical field of waste metal material recovery, and discloses a method for selectively adsorbing and enriching gold ions from multi-metal elements, which comprises the steps of loading pyridine triazine derivatives serving as ligands in a macroporous silicon-based material to serve as adsorption materials, and enriching gold ions from an acidic aqueous solution containing gold ions and other metal ions, wherein the pyridine triazine derivatives have the following structure, and R is straight-chain or branched-chain alkyl of C 3 -C 5 . The adsorption material adopted by the invention has high-efficiency selective enrichment effect on Au (III), and is suitable for adsorbing and recovering noble metal gold elements from weak acid and strong acid gold-containing waste liquid containing various other metal elements. The adsorption material has the characteristics of strong acid and alkali hydrolysis resistance, simple preparation process and low cost, and is more beneficial to efficiently recovering noble metal gold elements from gold-containing waste liquid in industrial production.

Inventors

• ZOU HUA
• CAO YIYAO
• XU LEI
• WANG PENG
• Yu shunfei
• REN HONG

Assignees

• 浙江省疾病预防控制中心
• 浙江大学

Dates

Publication Date

20260508

Application Date

20230926

Claims (8)

1. 1. A method for selectively adsorbing and enriching gold ions from multi-metal elements is characterized by comprising the steps of loading pyridine triazine derivatives serving as ligands in a macroporous silicon-based material to serve as an adsorption material, and enriching gold ions from an acidic aqueous solution containing gold ions and other metal ions, wherein the pyridine triazine derivatives have the following structures: Wherein R is a linear or branched alkyl group of C 3 -C 5 ; the gold ions are trivalent and originate from gold-containing slag or industrial waste electronic products; The acidic aqueous solution is an aqueous solution of hydrochloric acid with an acid concentration of 0.001-4M.
2. 2. The method for selectively adsorbing and enriching gold ions from a multi-metal element according to claim 1, wherein R is any one of propyl, n-butyl or n-pentyl.
3. 3. The method for selectively adsorbing and enriching gold ions from multi-metal elements according to claim 1, wherein the other metal ions comprise one or more of Ca(II)、Mg(II)、Sr(II)、Zn(II)、Pb(II)、Cd(II)、Cu(II)、Ru(III)、Rh(III)、La(III)、Eu(III)、Lu(III)、Fe(III)、Co(II)、Ni(II).
4. 4. The method for selectively adsorbing and enriching gold ions from multi-metal elements according to claim 1, wherein the mass ratio of the pyridine triazine derivative to the macroporous silicon-based material is 1 (2-5); or the loading of the pyridine triazine derivative in the macroporous silicon-based material is 15-35%.
5. 5. The method for selectively adsorbing and enriching gold ions from a multi-metal element according to claim 1, wherein the mass concentration of gold ions in the acidic aqueous solution is more than 0.2ppm, and the total mass concentration of other metal ions is 1000 times or less of the mass concentration of gold ions.
6. 6. The method for selectively adsorbing and enriching gold ions from multiple metal elements according to claim 1, wherein the enrichment time is more than 30min and the enrichment temperature is 15-55 ℃.
7. 7. The method for selectively adsorbing and enriching gold ions from multi-metal elements according to claim 1, wherein the mass volume ratio of the adsorbing material to the acidic aqueous solution is (10-100) mg (5-30) mL.
8. 8. The method for selectively adsorbing and enriching gold ions from multi-metal elements according to claim 1, wherein the preparation process of the adsorbing material specifically comprises the steps of dissolving the pyridine triazine derivative in dichloromethane, adding a macroporous silicon-based material, stirring and mixing, and drying after the completion of the steps to obtain the adsorbing material.

Description

Method for selectively adsorbing and enriching gold ions from multi-metal elements Technical Field The invention relates to the technical field of waste metal material recovery, in particular to a method for selectively adsorbing and enriching gold ions from multi-metal elements. Background Apart from its use as money, jewelry, gold has also found wide use in modern science and industry. Gold has extremely high corrosion resistance and chemical stability, good electrical conductivity and thermal conductivity, and gold nuclei have a large effective cross section for capturing neutrons, and the infrared reflection capacity of gold nuclei is close to 100%. Besides various catalyst properties, gold has good manufacturability, is very easy to process into ultrathin gold foil, micron gold wire and gold powder, is easy to electroplate on the surfaces of other metals, ceramics and glass, and can be easily welded and forge welded under certain pressure, and can also be made into superconductors, organic gold and the like. Gold has such a plurality of unique chemical and physical properties that gold is reasonably and widely used in the most important modern high and new technology industries, such as electronic technology, communication technology, aerospace technology, chemical technology, medical technology and the like, and has an irreplaceable position in the fields of industrial catalysis, hydrogen storage, energy storage and the like. However, the gold element content in the crust is extremely low, and the gold source is mainly from the utilization of natural mineral resources and the recycling of secondary resources of electronic products containing the gold element at present, but with the increase of gold resource loss, sustainable utilization of the gold resource is more and more difficult to realize. The waste mobile phones, televisions and computers use gold in the manufacturing process. The existing waste electronic products are often extracted and separated by adopting chemical methods such as extraction and the like, but the gold contained in the waste electronic products is often low in efficiency, and extremely toxic chemical substances such as cyanide and the like are used in the treatment process, so that the waste electronic products are harmful to health and pollute the environment. The chelate fiber is a multi-coordination polymer prepared by grafting various active groups on a fibrous polymer body through a crosslinking reaction, can obtain a multi-element chelate by utilizing the chelation of different functional groups and different metal ions, has higher adsorption capacity and selective enrichment capacity for the metal ions, and CN109610166A discloses a novel chelate fiber, a preparation method thereof and application of the novel chelate fiber in separating and enriching Au 3+ in electronic wastes. However, the preparation process of the polymer is complicated, the reaction time is long, and the adsorption of gold can be realized only in a weak acid environment (below 0.5 mol/L), so that the effect is often poor in a high-concentration acidic environment. If the novel ligand with lower toxicity can be adopted to carry out high-efficiency separation and purification on gold resources in waste electronic products, gold resource recycling is realized, and the method has important significance in expanding the sources of gold resources and developing gold resource recycling green separation and recycling processes in the current age which is increasingly focusing on energy conservation and environmental protection. Because the pyridine triazine ligand has strong acid hydrolysis resistance, radiation resistance and simple synthesis preparation process, the pyridine triazine ligand is mainly studied in the extraction and separation field of actinide metals at present, but the technical literature such as papers and patents related to the enrichment and separation of noble metal Au (III) by adopting the ligand and related functional materials has not been reported. Disclosure of Invention Aiming at the problems that gold in metal slag and waste electronic products is difficult to extract, the separation efficiency of a separation extractant is low, gold enrichment and adsorption are difficult to realize in a high-concentration acid environment in the prior art, the invention provides the method for efficiently enriching gold ions by a solution method, which can show high-selectivity enrichment capability on gold from a plurality of metal elements, still show high-efficiency separation efficiency in a high-concentration acid environment, and is nontoxic and environment-friendly. In order to achieve the above purpose, the invention adopts the following technical scheme: A method for selectively adsorbing and enriching gold ions from multi-metal elements adopts pyridine triazine derivatives as ligands to be loaded in a macroporous silicon-based material as an adsorption material, and enriches gold