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A pretreatment method for precious metal smelting dust

A precious metal pretreatment technology, applied in the direction of improving process efficiency, can solve the problems of precious metal loss, unfavorable recovery of selenium, dispersion of selenium elements, etc., achieve the effect of less impurity content, solve the problem of valuable metal recovery, and high grade of precious metals

Active Publication Date: 2017-06-16
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process, sulfuric acid leaching solution, sodium chlorate enhanced deselenization solution and silver concentrate all contain selenium, and the selenium element is too dispersed, which is not conducive to further selenium recovery.
At the same time, there are also uncertain precious metal losses caused by the selection of beneficiation process

Method used

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  • A pretreatment method for precious metal smelting dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A precious metal smelting fume, its main components and contents are: Au 0.58%, Ag 5.9%, Se 5.32%, Hg 6.22%, C 2.14%, Na 9.11%, Zn 2.39%, Cl 46.6%, the total grade of precious metal is about 6.5% %. The specific preprocessing steps are as follows:

[0041] 1) Add 1500mL of water into the acid-resistant reaction vessel with stirring, turn on the stirring, add sulfuric acid to adjust the pH value to 0.5, and add 500g of precious metal smelting dust, that is, the liquid-solid weight ratio is 3:1. After stirring evenly, add 2.65g of cosolvent zinc powder, 1.24g of sodium hypophosphite, and 1.11g of sodium pyrosulfite.

[0042] 2) Control the temperature at 70°C for enhanced leaching for 1.5 hours. After the leaching is completed, the solid and liquid are separated to obtain leaching residue and immersion liquid. The leaching residue is roasted by catalytic oxidation, and the immersion liquid is sent to water treatment.

[0043] 3) Drain the slag and dry it, add the cataly...

Embodiment 2

[0047] A precious metal smelting fume, its main components and contents are: Au 0.21%, Ag 8.0%, Se 5.03%, Hg 5.98%, C 1.46%, Na 9.32%, Zn 4.51%, Cl 44.9%, the total grade of precious metal is about 8.2% %. The specific preprocessing steps are as follows:

[0048]1) Add 1500mL of water into the acid-resistant reaction vessel with stirring, turn on the stirring, add hydrochloric acid to adjust the pH value to 1.5, and add 1500g of precious metal smelting dust, that is, the liquid-solid weight ratio is 1:1. After stirring evenly, add 7.96g of cosolvent zinc powder, 3.71g of sodium hypophosphite, and 3.33g of sodium pyrosulfite.

[0049] 2) Control the temperature at 95°C to carry out intensive leaching for 3.0 hours. After the leaching is completed, the solid and liquid are separated to obtain leaching residue and leaching liquid. The leaching residue is roasted by catalytic oxidation, and the leaching liquid is sent to water treatment.

[0050] 3) Drain the slag and dry, add ...

Embodiment 3

[0054] A precious metal smelting fume, its main components and contents are: Au 2.48%, Ag 2.1%, Se 9.96%, Hg6.44%, C 3.70%, Na 8.16%, Zn 1.55%, Cl 44.1%, the total grade of precious metal is about 4.6% %. The specific preprocessing steps are as follows:

[0055] 1) Add 2100mL of water into the acid-resistant reaction vessel with stirring, turn on the stirring, add sulfuric acid:hydrochloric acid at a ratio of 1:1 to adjust the pH value to 2.5, add 300g of precious metal smelting dust, that is, the liquid-solid weight ratio is 7:1. After stirring evenly, add 1.59g of cosolvent zinc powder, 0.74g of sodium hypophosphite, and 0.67g of sodium pyrosulfite.

[0056] 2) The temperature is controlled at 50°C for enhanced leaching, and the enhanced leaching lasts for 4.0 hours. After the leaching is completed, the solid and liquid are separated to obtain leaching residue and immersion liquid. The leaching residue is roasted by catalytic oxidation, and the immersion liquid is sent to w...

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Abstract

The invention discloses a simple and high-efficiency precious metal smelting smoke dust pretreatment method. According to the pretreatment method, selenium, mercury, base metals and other harmful impurity elements in the precious metal smelting smoke dust can be efficiently removed, so that the precious metals such as gold and silver in the smoke dust are greatly enriched. The precious metal materials pretreated by the method are high in precious metal grade and small in impurity content and can be directly recycled by a conventional mature precious metal refining technology.

Description

technical field [0001] The invention belongs to the technical field of precious metal recovery in the nonferrous smelting industry, and specifically relates to a pretreatment method for comprehensively recovering valuable elements such as gold, silver, selenium and mercury from precious metal smelting dust. [0002] technical background [0003] The noble metal smelting fume mentioned in the present invention refers to the fume generated during pyro-smelting of gold, silver and other precious metals. The main valuable elements in the dust are gold, silver and other precious metals, and the content of selenium and mercury is relatively high. [0004] At present, during the pyro-smelting process of precious metals in China, some precious metal fine particle dust will enter the flue along with the high-temperature flue gas generated by volatile impurities, and cool and deposit in the flue. Since this part of the dust contains precious metal elements, it must be recovered to avo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B11/00
CPCY02P10/20
Inventor 张福元雷明郑雅杰彭国敏
Owner CENT SOUTH UNIV
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