Method used for selective recovery of gold in aqueous solutions via reduction and adsorption coupling

An aqueous solution and selective technology, applied in the field of hydrometallurgy, can solve the problems of limited glycine and reduce the effective functional groups of glycine, etc., and achieve the effect of simple preparation process, uniform size and increased loading capacity

Inactive Publication Date: 2015-07-22
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention has the step of glutaraldehyde cross-linking glycine to chitosan microspheres in the process of adsorbent synthesis, and the modification process utilizes the amino group in glycine to react with the aldehyde group in glutaraldehyde to consume the amino functional group in glycine, while The reduction of gold depends on the reduction of amino groups in glycine, so the number of effective functional groups of glycine will be greatly reduced. Secondly, the amount of glycine that can be modified into chitosan is limited, and the adjustment of the amount of glycine added is not as good as directly adding to chitosan. The solution system can be added and adjusted flexibly

Method used

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  • Method used for selective recovery of gold in aqueous solutions via reduction and adsorption coupling
  • Method used for selective recovery of gold in aqueous solutions via reduction and adsorption coupling
  • Method used for selective recovery of gold in aqueous solutions via reduction and adsorption coupling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1 Hydrothermal carbon spheres selectively adsorb gold in mixed metal solutions

[0051] 1) Preparation of original solutions of various metal ions: In this study, hydrochloric acid system was taken as an example, a certain mass of chloroauric acid, chloroplatinic acid, rhodium chloride, copper chloride, ferric chloride, cobalt chloride, nickel chloride The solids of palladium chloride and palladium were added into deionized water to dissolve, and the insolubles were removed by filtration to obtain the original solutions of various metal ions, the concentration of which was 1mmol / L.

[0052] 2) Use the solution in 1) as the mother solution, adjust the pH of the solution with HCl and NaOH, and prepare 0.1mmol / L mixed metal solutions with different pH values. The mixed metals include chloroauric acid, chloroplatinic acid, rhodium chloride, and copper chloride. , ferric chloride, cobalt chloride, nickel chloride and palladium chloride.

[0053] 3) Put 10mg of hydro...

Embodiment 2

[0057] When Example 2 is added with or without glycine, the influence of different gold concentrations on the adsorption of gold by hydrothermal carbon spheres

[0058] 1) Preparation of single-component gold ion solution: In this study, the hydrochloric acid system was taken as an example. A certain mass of chloroauric acid solid was dissolved in deionized water, and the insoluble matter was removed by filtration to obtain a single-component solution of 0.1mol / L gold ion.

[0059] 2) Prepare 0.3mol / L glycine solution.

[0060] 3) Put 10mg of hydrothermal carbon sphere metal adsorbent into 13 50mL Jusai Erlenmeyer flasks, add different volumes of chloroauric acid solution prepared in step 1), adjust the pH value to about 6 with HCl and NaOH, and use deionized The water is adjusted to a total solution volume of 10 mL, and the concentration of gold ions in the solution is distributed in the range of 0.1 mmol / L to 5 mmol / L.

[0061] 4) Put 10mg of hydrothermal carbon sphere meta...

Embodiment 3

[0065] Embodiment 3 adds and does not add hydrothermal carbon sphere, the impact of different concentrations of glycine on the recovery rate of gold in aqueous solution

[0066] 1) Preparation of 0.1mol / L chloroauric acid solution: In this study, the hydrochloric acid system was taken as an example. A certain mass of chloroauric acid solid was dissolved in deionized water, and the insoluble matter was removed by filtration to obtain a 0.1mol / L chloroauric acid solution.

[0067] 2) Prepare a glycine solution with a concentration of 1M.

[0068] 3) Prepare chloroauric acid solutions with different concentrations of glycine: add 0.2mL of chloroauric acid solutions prepared in step 1), add different volumes of glycine solutions in step 2), adjust the pH value to about 6 with HCl and NaOH, and use deionized The water was adjusted to a total solution volume of 10 mL to obtain gold solutions containing different concentrations of glycine, a gold ion concentration of 2 mmol / L, and a ...

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Abstract

The invention discloses a method used for selective recovery of gold in aqueous solutions via reduction and adsorption coupling. The method comprises following steps: an adsorbent is added into a gold-containing solution at a certain solid-liquid ratio; an amino acid reducing agent with a certain concentration is added; an obtained mixture is subjected to oscillation for 10min to 48h so as to realize solid-liquid separation; and the adsorbent loaded with gold is subjected to washing with a thiocarbamide hydrochloric acid solution so as to realize complete desorption of gold; after desorption, the adsorbent is recycled with 1M NaOH; or the adsorbent loaded with gold is subjected to roasting at 400 to 600 DEG C, and metallic gold is obtained via adsorbent decomposition. According to the method, auxiliary amino acid reducing agents such as glycine are added into the solutions, so that loading capacity of the adsorbent on gold is increased greatly, and gold absorbed by the adsorbent can be recycled in that state of metallic gold; desorption of loaded gold can be realized with acidic thiocarbamide solutions; and the adsorbent can be recycled via activation with alkali. The application prospect of the method is promising because of the advantages.

Description

technical field [0001] The invention relates to a method for selectively recovering gold in an aqueous solution by coupling reduction and adsorption, in particular to a method for recovering gold by coupling hydrothermal carbon sphere adsorption and amino acid reduction, which is mainly used for highly selective recovery of gold from aqueous solution, thereby The method for realizing the recovery of simple gold or the enrichment of gold ions belongs to the field of hydrometallurgy. Background technique [0002] Gold (Au), silver (Ag), and platinum group metals (ruthenium (Ru), rhodium (Rh), palladium (Pd), osmium (Os), iridium (Ir), platinum (Pt)) and other eight elements, They are collectively referred to as precious metals due to their low abundance in minerals and their high price. Precious metals have very stable physical and chemical properties, and have good ductility, stability and catalytic activity. They are widely used in aerospace, chemical and military, pharmace...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/24C22B3/44C22B11/00
CPCY02P10/20
Inventor 赵君梅王福春霍芳刘会洲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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