Method for extracting gold and/or silver from sulfuric acid slag

A technology of sulfuric acid slag and ester-based thiourea, applied in the direction of improving process efficiency, etc., to achieve the effect of high selectivity and fast leaching speed

Inactive Publication Date: 2012-07-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there is no report on the extraction of gold and silver from sulfuric acid slag by the process of acidic thiourea countercurrent leaching-ester-based thiourea resin adsorption-dilute acid solution desorption-iron reducing agent replacement process

Method used

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  • Method for extracting gold and/or silver from sulfuric acid slag
  • Method for extracting gold and/or silver from sulfuric acid slag
  • Method for extracting gold and/or silver from sulfuric acid slag

Examples

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Effect test

Embodiment 1

[0029] process such as figure 1 shown. Take 100 parts of sulfuric acid slag from a sulfuric acid factory in Jiangxi and add it to leaching tank 1, and take another 100 parts of sulfuric acid slag and add it to leaching tank 2. Add 300 parts of water, 4.5 parts of thiourea, and 55 parts of concentrated sulfuric acid to the two leaching tanks respectively. , control the temperature at 50 ° C for 8 hours, and obtain the leachate after filtration; move the leaching residue from leaching tank 2 into leaching tank 1, move the leaching liquid from leaching tank 1 into leaching tank 2, and add 300 parts of water and 4.5 parts of thiourea to leaching tank 1 , 55 parts of concentrated sulfuric acid, add 100 parts of sulfuric acid slag in the leaching tank 2, control the temperature to leaching at 50°C for 8h, and obtain the leachate after filtration; pass the leachate in the leaching tank 2 through the PTU-1 resin adsorption column at a speed of 6BV / h, The adsorption temperature is 18°...

Embodiment 2

[0031] process such as figure 2 shown. Take 100 parts of sulfuric acid slag from a sulfuric acid factory in Jiangxi and add it to leaching tank 1, and add another 100 parts of sulfuric acid slag to leaching tank 2. Add 300 parts of water, 4 parts of thiourea, and 50 parts of concentrated sulfuric acid to the two leaching tanks respectively. , control the temperature at 50°C for 8 hours, and obtain the leach solution after filtration; move the leaching residue from leaching tank 2 into leaching tank 1, move the leaching solution from leaching tank 1 into leaching tank 2, and add 300 parts of water and 1 part of thiourea to leaching tank 1 , 15 parts of concentrated sulfuric acid, add 100 parts of sulfuric acid slag to the leaching tank 2, control the temperature at 50 ° C for 8 hours, and obtain the leaching solution after filtration; pass the leaching solution in the leaching tank 2 through the PTU-2 resin adsorption column at a speed of 6BV / h , the adsorption temperature is...

Embodiment 3

[0033] Carry out the experiment by the operating procedure of embodiment 2, in the circulation experiment, the leaching agent that leaching tank 2 adds is 300 parts of water, 2 parts of thiourea, 15 parts of sulfuric acid, the used adsorbent of adsorption process is PTU-3 resin, all the other operations are all the same. Same as implementation 2. The overall recoveries for gold and silver were 81.7% and 70.7%, respectively. The particle size distribution and XRD pattern of sulfuric acid slag before and after leaching are as follows Figure 3-6 shown. It can be seen from the figure that the particle size distribution and XRD diffraction peaks of sulfuric acid slag are basically unchanged before and after leaching, indicating that the leaching process does not change the particle size and crystal form of sulfuric acid slag, and does not affect its further smelting.

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Abstract

The invention discloses a method for extracting gold and/or silver from sulfuric acid slag. The method comprises the following steps: performing multi-stage countercurrent leaching on sulfuric acid slag containing gold and silver by using an acidic thiourea solution; adsorbing a leachate by using an ester-based thiourea resin column; and after elution of a dilute acid, performing replacement and reduction by using iron to obtain noble mud containing gold and silver. The adsorption solution and the replacement solution can respectively return to a former process to be used as a leaching agent and an eluting agent; and in the operating process, wastewater and waste residues are not discharged, so that the method has remarkable environmental and economic benefits.

Description

technical field [0001] The invention belongs to the field of precious metal hydrometallurgy, and mainly relates to a method for extracting gold and / or silver from sulfuric acid slag. Background technique [0002] Sulfuric acid slag produced in the production process of sulfuric acid is one of the main solid wastes produced by the chemical industry. A large amount of sulfuric acid slag is produced every year. The landfill treatment of sulfuric acid slag not only seriously pollutes the environment, but also occupies land and affects resources. Also a waste. Sulfuric acid slag is a very valuable secondary resource. If it can be used reasonably, it can greatly alleviate the shortage of iron ore supply, not only protect the environment, but also avoid the waste of resources, and win considerable profits for related enterprises. profits. There are also many sulfuric acid slags containing precious metals, and the extraction of precious metals is also a technical problem, but the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/04C22B3/24C22B3/46C22B11/00
CPCY02P10/20
Inventor 钟宏王帅赵刚文彦龙曹占芳刘广义
Owner CENT SOUTH UNIV
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