阅读说明：本技术 一种硫代硫酸盐体系中载金炭上金的回收方法 (Method for recovering gold from gold-loaded carbon in thiosulfate system ) 是由 字富庭 陈云龙 胡显智 杜欢欢 杨朋 秦雪聪 刘洋 陈树梁 林玥 成会玲 于 2019-10-15 设计创作，主要内容包括：本发明公开一种硫代硫酸盐体系中载金炭上金的回收方法,属于湿法冶金、贵金属回收领域。该方法首先用去离子水洗涤载金炭除去灰分,过滤,对载金炭加热活化；然后将加热后的载金炭置于硫代硫酸盐溶液中进行解吸；本发明所述方法具有成本低、解吸试剂安全无毒等优点；可以有效解吸载金炭上的金,且不破坏活性炭,通过再次改性活性炭可以达到活性炭循环利用的目的。(The invention discloses a method for recovering gold on gold-loaded carbon in a thiosulfate system, and belongs to the field of hydrometallurgy and precious metal recovery. Washing gold-loaded carbon with deionized water to remove ash, filtering, and heating and activating the gold-loaded carbon; then putting the heated gold-loaded carbon into thiosulfate solution for desorption; the method has the advantages of low cost, safe and nontoxic desorption reagent and the like; the gold on the gold-loaded carbon can be effectively desorbed without destroying the active carbon, and the purpose of recycling the active carbon can be achieved by modifying the active carbon again.)

1. A method for recovering gold from gold-loaded carbon in a thiosulfate system is characterized by comprising the following steps:

(1) washing the gold-loaded carbon by deionized water to remove ash, and filtering;

(2) heating and activating the gold-loaded carbon;

(3) desorbing the heated gold-loaded carbon in a thiosulfate solution, wherein the liquid-solid ratio (m L: g) of the thiosulfate solution to the gold-loaded carbon is 5-100;

(4) the active carbon obtained by analysis can be used for gold adsorption again after being modified, so that the cyclic use of the active carbon is realized.

2. The method of claim 1 for recovering gold from gold-loaded carbon in a thiosulfate system, characterized in that: the gold-loaded carbon is activated carbon which is adsorbed with gold in a thiosulfate system.

3. The method of claim 1 for recovering gold from gold-loaded carbon in a thiosulfate system, characterized in that: the heating temperature in the step (2) is 100-400 ℃, and the heating time is 1-48 h.

4. The method according to claim 1 or 3, wherein the concentration of the sodium thiosulfate solution is 0.005 to 0.5 mol/L.

5. The method of claim 1 for recovering gold from gold-loaded carbon in a thiosulfate system, characterized in that: the desorption time of the gold-loaded carbon in the thiosulfate solution is 1-24 h.

Technical Field

The invention relates to a method for recovering gold on gold-loaded carbon in a thiosulfate system, and belongs to the field of hydrometallurgy and precious metal recovery.

Background

The society is continuously and rapidly developed, the environmental protection consciousness is shallow and happy, and the research on green gold-extracting technology is an epoch mission. Compared with the traditional gold extraction technologies such as a cyanidation method, a halogen method, a haloid method, a mercury mixing method, a lime-sulfur method and the like, the gold leaching by using thiosulfate has the advantages of no toxicity, environmental protection, safety and the like, and the gold ore which is difficult to treat by the cyanidation method such as copper, arsenic, antimony, carbon and the like is easy to treat. Therefore, the thiosulfate gold extraction is a green gold extraction technology with unique prospect and according with the times theme. With the progress of a large amount of work (see patents: CN 201710450249.6; CN201811352986.3 and CN 201811352989.7), the problems of thiosulfate consumption, gold adsorption on activated carbon and the like are overcome one by one, the application possibility of a carbon slurry method (CIP) in a thiosulfate leaching system is increased, and the industrial goal is further approached. However, after gold adsorption, an efficient and green method is needed to recover gold on activated carbon, so that the activated carbon can be recycled, and finally, sustainable development of the gold extraction technology is realized.

The prior patent (201910137629.3) discloses that the gold-loaded carbon is eluted with an organic solvent to a certain extent, so that the gold on the next part of the gold-loaded carbon can be eluted. However, the method needs a large amount of organic solvent, and a strict sealing measure needs to be adopted in the elution process, so that certain potential safety hazard exists, and the large-scale application is difficult. Moreover, incineration of gold-loaded carbon can certainly recover gold, but such disposal is not preferable in actual production, both polluting the environment and consuming expensive activated carbon (1 million RMB/ton per month). However, the problem of gold recovery from gold-loaded carbon must be solved in order to industrialize thiosulfate gold-extraction systems.

The invention relates to a method for preparing a high-temperature-resistant ceramic material.

Disclosure of Invention

The invention aims to provide a method for recovering gold on gold-loaded carbon in a thiosulfate system, which separates the gold on the gold-loaded carbon by using a non-toxic and cheap thiosulfate solution, solves the problems of recovery of gold on the live gold-loaded carbon and reuse of the active carbon, and specifically comprises the following steps:

(1) washing the gold-loaded carbon by deionized water to remove ash, and filtering.

(2) Heating and activating the gold-loaded carbon.

(3) And (3) desorbing the heated gold-loaded carbon in a thiosulfate solution (the desorption time is 1-24 h), wherein the liquid-solid ratio (m L: g) of the thiosulfate solution to the gold-loaded carbon is 5-100.

(4) The active carbon obtained by analysis can be used for gold adsorption again after being modified, so that the cyclic use of the active carbon is realized.

The gold-loaded carbon is activated carbon which is adsorbed with gold in a thiosulfate system.

Preferably, the heating temperature in the step (2) of the invention is 100-.

Preferably, the concentration of the sodium thiosulfate solution in the invention is 0.005-0.5 mol/L.

The method of modifying the activated carbon obtained by resolution in the method of the present invention is a conventional modification method, for example, the modification methods mentioned in patent applications CN201710450249.6, CN201811352986.3 and CN 201811352989.7.

The invention has the beneficial effects that:

(1) the desorption method provided by the invention is simple and easy to operate, easy to control all factors, low in cost and good in desorption effect.

(2) The thiosulfate solution used in the recovery process is the leaching agent, is safe and nontoxic, does not discharge toxic and polluting substances, and is almost harmless to the environment.

(3) The active carbon desorbed in the method is easy to modify again and is used for adsorbing gold, so that the active carbon can be recycled, and the cost is saved.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

The invention will be described in more detail with reference to the following figures and examples, but the scope of the invention is not limited thereto.