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Method for synergistically desorbing gold thiosulphate coordination ions from strongly-alkaline anion exchange resin

A technology of gold thiosulfuric acid and exchange resin, which is applied in the field of hydrometallurgy, can solve the problems of increased gold recovery cost, adverse effects of gold recovery, and long desorption process, and achieves the effects of economical desorbent, thorough desorption, and simple process

Active Publication Date: 2017-12-19
CENT SOUTH UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In addition, the desorption solution obtained by this method is unstable, and when the electrowinning method is used to recover gold from it, there will be a black precipitate of gold, which is unfavorable for the recovery of gold.
[0005] In summary, the traditional method for desorbing gold thiosulfate complex ions from strongly basic anion exchange resins has major problems in terms of reagent stability, economy or environmental protection.
Moreover, the desorption of gold and the regeneration of the resin need to be carried out step by step, resulting in a long desorption process. In addition, the resin is easily poisoned during this process, making it difficult to recycle, resulting in increased gold recovery costs.
In addition, a high concentration of desorbent may adversely affect the further recovery of gold in the desorbed liquid (generally by electrowinning method)

Method used

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  • Method for synergistically desorbing gold thiosulphate coordination ions from strongly-alkaline anion exchange resin

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Firstly, the simulated thiosulfate leaching solution was used to prepare the gold-loaded resin by the method of stirring and adsorption. Among them, the gold concentration in the simulated thiosulfate leach solution is 20mg / L, the sodium thiosulfate concentration is 0.3mol / L, the copper concentration is 0.03mol / L, the ammonia water concentration is 1mol / L, the volume of the simulated leach solution is 2L, and the adsorption resin Tulsion A-21S strong basic resin was used, the amount of resin was 10mL, the stirring speed was 150r / min, and the adsorption time was 1h. After the adsorption is finished, a resin with a gold loading of 5 kg / t is obtained. Then, the obtained gold-loaded resin was packed into a column. Wherein, the inner diameter of the exchange column is 4 mm, the height of the resin bed is 80 cm, and the volume of the resin bed is 10 mL.

[0025] Using Na 2 SO 3 The mixed solution with NaOH is used as a desorbent to dynamically desorb the above-mentioned g...

Embodiment 2

[0027] The gold-loaded resin used is the same as in Example 1, using Na 2 SO 3 The mixed solution with NaOH is used as a desorbent to dynamically desorb the above-mentioned gold-loaded resin. In desorbent: Na 2 SO 3 The concentration is 0.4mol / L, and the NaOH concentration is 0.3mol / L. The desorbent flow rate was 3 resin bed volumes / hour and the dosage was 18 resin bed volumes. Under these conditions, the concentration of gold in the obtained desorption solution was 190.2mg / L, and the desorption rate of gold was 97.8%.

Embodiment 3

[0029] The gold-loaded resin used is the same as in Example 1, using Na 2 SO 3 The mixed solution with NaOH is used as a desorbent to dynamically desorb the above-mentioned gold-loaded resin. In desorbent: Na 2 SO 3 The concentration is 0.5mol / L, and the NaOH concentration is 0.4mol / L. The desorbent flow rate was 3 resin bed volumes / hour and the dosage was 16 resin bed volumes. Under these conditions, the concentration of gold in the obtained desorption solution was 214.8mg / L, and the desorption rate of gold was 98.2%.

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Abstract

The invention discloses a method for synergistically desorbing gold thiosulphate coordination ions from strongly-alkaline anion exchange resin. A mixed solution of Na2SO3 and NaOH serves as a desorption agent, and dynamic desorption is conducted on the strongly-alkaline anion exchange resin loaded with the gold thiosulphate coordination ions. According to the method, the synergistic effect of two components, namely SO3<2> and OH, is utilized, and desorption is conducted on the [Au(S2O3)2]<3> coordination ions adsorbed on the strongly-alkaline anion exchange resin; and the desorption rate of gold can reach 97% or above. Compared with traditional methods that a thiocyanate solution or a polythionate solution or a nitrate solution or another type of solution composed of a single component is adopted for desorption, the desorption method has the remarkable beneficial effects that reagents are free of toxicity; performance is stable; desorption cost is low; resin desorption and regeneration are completed by the same step; and the gold in the desorption solution can be further recycled conveniently. And good industrial application prospect is achieved.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for synergistically desorbing gold thiosulfate complex ions from strongly basic anion exchange resins. Background technique [0002] As an important non-cyanide gold extraction method, the thiosulfate method has the advantages of non-toxicity, fast gold leaching speed, no corrosion to equipment, and good treatment effect on refractory gold ores containing carbon and copper, etc. workers' attention. However, there are still several major problems to be solved before this method is widely used in industry, one of which is the difficulty in recovering gold from its gold leaching solution. [0003] The composition of thiosulfate gold leaching solution is complex, except for [Au(S 2 o 3 ) 2 ] 3- In addition to complex ions, it also contains a large number of unavoidable ions, including copper ions, thiosulfate ions, polythionate and other metal ions. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/24
CPCC22B3/24C22B11/04Y02P10/20
Inventor 徐斌李骞董中林姜涛杨永斌孔文浩李科李光辉郭宇峰陈许玲范晓慧黄柱成张元波许斌彭志伟甘敏易凌云杨凌志
Owner CENT SOUTH UNIV
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