Application of high-sulfur coal and method for recycling Au (S2O3) 23-by using roasted product of high-sulfur coal

A technology for roasting products and high-sulfur coal, applied in chemical instruments and methods, alkali metal oxides/hydroxides, and other chemical processes, can solve problems that threaten life and property safety, farmland heavy metal pollution, and air pollution, and achieve The preparation process is simple, the environment is friendly, and the effect of low cost

Active Publication Date: 2022-06-03
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because high-sulfur coal cannot be burned directly, high-sulfur coal that has been piled up for a long time is prone to dangerous accidents such as landslides, collapses, and spontaneous combustion after being soaked in rainwater, weathered, and oxidized; coal spontaneous combustion will release a large amount of SO 2 、H 2 S and NO 2 Harmful gases such as carbon dioxide and other harmful gases pollute the atmosphere, causing acid rain and atmospheric damage; fine coal particles enter the water and soil in the surrounding area under the action of rainwater erosion, causing heavy metal pollution in rivers and farmland, threatening the surrounding ecological environment and people. safety of life and property

Method used

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  • Application of high-sulfur coal and method for recycling Au (S2O3) 23-by using roasted product of high-sulfur coal
  • Application of high-sulfur coal and method for recycling Au (S2O3) 23-by using roasted product of high-sulfur coal
  • Application of high-sulfur coal and method for recycling Au (S2O3) 23-by using roasted product of high-sulfur coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

(1) Take the original high-sulfur coal for crushing and grinding, sieve into 200-mesh samples and dry at 70 °C;

(2) Put a corundum boat in the tube resistance furnace, pour 10g of weighed high-sulfur coal powder, and roast the high-sulfur coal at 1000°C for 2h in a nitrogen atmosphere.

[0020] Take four 0.5g roasted high-sulfur coals prepared in this example and add them to 100 mL containing Au(S) respectively. 2 O 3 ) 2 3- In the solution, Au(S 2 O 3 ) 2 3- The concentration of Au (S 2 O 3 ) 2 3- The adsorption rate reached 80%.

[0021] from figure 1 It can be seen that with the increase of temperature, the loading of gold complex ions by high-sulfur coal also increases, indicating that the experiment in a higher temperature environment is more conducive to the progress of adsorption and the improvement of equilibrium adsorption capacity. In the first 30 minutes, the adsorption efficiency increased rapidly, reaching more than 80%, and then th...

Embodiment 2

Embodiment 3

[0028] Get 0.5g of roasting high-sulfur coal prepared in this example and add it to 100mL containing Au (S 2 O 3 ) 2 3- In the solution, Au(S 2 O 3 ) 2 3- The concentration of Au(S) was 80 ppm, the pH value of the solution was adjusted to 10, and the temperature was 2 O 3 ) 2 3- The adsorption rate reached 85%.

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Abstract

The invention belongs to the technical field of precious metal recovery in hydrometallurgy, and particularly discloses application of high-sulfur coal and a method for recovering Au (S2O3) 2 < 3-> by using a roasted product of the high-sulfur coal, the roasted product obtained after the high-sulfur coal is roasted is used for adsorbing Au (S2O3) 2 < 3-> from thiosulfate gold leaching liquid, the high-sulfur coal is roasted for 2-8 h in an inert gas atmosphere at the temperature of 500-1200 DEG C, and the Au (S2O3) 2 < 3-> is obtained. Obtaining a roasted product; and the roasted product is taken and added into a thiosulfate gold leaching solution, the pH value of the thiosulfate gold leaching solution is adjusted to be 8-10, and Au (S2O3) < 3-> is adsorbed by the roasted product at the temperature of 30-60 DEG C. Compared with the prior art, the high-sulfur coal adsorption material is prepared by utilizing a one-step roasting modification method, and compared with a modified activated carbon process, the adsorption material is low in cost, simple in preparation process and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of precious metal recovery in hydrometallurgy, in particular to the use of high-sulfur coal and the recovery of Au(S 2 O 3 ) 2 3- Methods. Background technique [0002] The advantages of the thiosulfate leaching method are that it has low toxicity, little harm to the environment, fast leaching rate, high efficiency, easy to be degraded by microorganisms, mild leaching conditions, little corrosion to equipment, and easy to deal with difficult ores such as carbonaceous gold. Wait. Therefore, the industrial application of thiosulfate gold extraction method has always been the focus of domestic and foreign scholars. However, one of the main problems affecting the practical application of this process is the difficulty in recovering gold from the leaching solution. Therefore, it has been explored that Au(S 2 O 3 ) 2 3- This method will effectively promote the industrial application of the thiosulfate gol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B01J20/02B01J20/28C22B3/24C22B11/00
CPCB01J20/3028B01J20/0285B01J20/28011C22B3/24C22B11/04Y02P10/20
Inventor 聂彦合王强陈江濠史长亮邢宝林
Owner HENAN POLYTECHNIC UNIV
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