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Method for leaching and recycling valuable elements of copper smelting smoke dust

A technology of valuable elements and recovery methods, applied in the direction of improving process efficiency, can solve problems such as poor leaching effect, difficulty in effective recovery and safe disposal, and achieve good leaching effect, wide application range and stable technical indicators. Effect

Active Publication Date: 2021-09-28
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art, and provide a method for leaching and recovering valuable elements from copper smelting fumes, so as to overcome the limitations of the existing methods on the fume treatment process produced in the smelting and blowing process of copper smelting. The leaching effect of copper, zinc and arsenic is not good and it is difficult to effectively recover and safely dispose of the problem. This method has a good leaching effect of valuable metals such as copper and zinc; during the treatment process, arsenic forms a stable compound and forms an open circuit from the main process; Advantages of low cost and easy operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] The dust in this example comes from a copper concentrate Osmet furnace of a domestic enterprise, and the main components are (%) by mass percentage: Pb12.53%, Cu15.84%, Zn7.52%, As8.00%, Bi2.36%, S12.32%, the balance is SiO 2 and others. Handled as follows:

[0085] Concentrated sulfuric acid activation treatment: Use concentrated sulfuric acid to activate the dust, in which the acid-mineral ratio is 1.25:1, the treatment time is 2 hours, and the treatment temperature is controlled at 40°C.

[0086] Leaching: The flue dust pretreated by concentrated sulfuric acid is subjected to atmospheric pressure acid leaching, the sulfuric acid concentration is 0.1mol / L, the liquid-solid ratio is 0.5:1, the temperature is 60°C, and the time is 2h. In the acid leaching residue: Pb 43.91%, Cu 3.82%, Zn 0.77%, As 1.05%, Bi 3.24%, S 6.87%.

[0087] Precipitation of arsenic in alkaline system: use NaOH to adjust the pH value of the leaching solution to PH=1, the reaction time is 2 hou...

Embodiment 2

[0092] The soot in this example comes from the white soot produced by a copper smelting converter in a domestic enterprise, and the main components are (%) by mass percentage: Pb28.93%, Cu10.33%, Zn9.80%, As23.12%, Bi1 .66%, S13.21%, the balance is SiO 2 and others. Handled as follows:

[0093] Concentrated sulfuric acid activation treatment: Pretreat the dust with concentrated sulfuric acid, in which the acid-mineral ratio is 1.5:1, the treatment time is 2 hours, and the treatment temperature is controlled at 50°C.

[0094] Leaching: The soot after sulfuric acid activation treatment is subjected to normal pressure acid leaching, the sulfuric acid concentration is 0.25mol / L, the liquid-solid ratio is 1:1, the temperature is 40°C, and the time is 2h. In the leaching residue: Pb46.82%, Cu3.34%, Zn0.34%, As0.45%, Bi3.72%, S5.46%.

[0095] Precipitation of arsenic in alkali system: adjust the pH value of the leachate to PH=1 with lime, the reaction time is 1h, the reaction temp...

Embodiment 3

[0100] The soot in this example comes from the white soot produced by a flash conversion furnace of a domestic enterprise, and the main components are (%) by mass percentage: Pb25.66, Cu15.61%, Zn8.60%, As14.8%, Bi2.67%, S15.50%, the balance is SiO 2 and others. Handled as follows:

[0101] Concentrated sulfuric acid activation treatment: Activate the dust with concentrated sulfuric acid, in which the acid-mineral ratio is 1.5:1, and the storage time is 4 hours at room temperature.

[0102] Leaching: Acid leaching is carried out on the flue dust activated by sulfuric acid, the sulfuric acid concentration is 0.3mol / L, the liquid-solid ratio is 1.5:1, the temperature is 60°C, and the time is 1h. Acid leaching residue: containing Pb33.87%, Cu2.61%, Zn1.80%, As0.25%, Bi3.83%, S5.82%.

[0103] Precipitation of arsenic in alkali system: adjust the pH value of the leachate to PH=1.5 with milk of lime, the reaction time is 1h, the reaction temperature is 70°C, the arsenic is precip...

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Abstract

The invention discloses a method for leaching and recycling valuable elements of copper smelting smoke dust, and belongs to the technical field of hydrometallurgy. The method comprises the following steps of mixing smoke dust and concentrated sulfuric acid according to a certain acid-dust ratio for pretreatment; carrying out dilute sulfuric acid leaching on the smoke dust, carrying out solid-liquid separation to obtain a primary leachate and primary leaching residues, and feeding the leaching residues to a lead smelting system for recycling; adding an alkaline reagent into the primary leachate, so that arsenic in the solution is removed in a stable arsenate solid form; recovering valuable metals such as copper, cadmium and the like by a replacement method, adding zinc powder into the solution after arsenic precipitation, and precipitating and recovering the valuable metals such as copper and the like from the solution in the form of sponge copper at a certain temperature for a certain time; and concentrating, crystallizing and recovering zinc, purifying the solution subjected to copper deposition, and concentrating and crystallizing to obtain a zinc sulfate heptahydrate product. The method is suitable for leaching smoke dust generated by smelting and blowing processes in the copper smelting process, the application range of the method is wide, the treatment effect on elements such as copper, lead, zinc and arsenic is good, economic benefits are high, and the method is suitable for industrial application.

Description

Technical field: [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for leaching and recovering valuable elements from copper smelting smoke. Background technique: [0002] Copper smelting is an important non-ferrous metal smelting industry in my country, and the copper produced by pyrometallurgy accounts for about 80% of the total. The copper pyro-smelting system has the characteristics of large production capacity, high energy consumption, and high emissions. During the copper smelting process, a large amount of SO2 will be produced. 2 , heavy metal compounds and other fine particles of smoke, the content of arsenic and heavy metals in the smoke is very high, and the highly toxic arsenic oxides bring great trouble to the treatment of the smoke. In addition, due to the continuous decline in the grade of copper smelting raw ores and the increase of associated ores containing various elements in recent years, the com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B13/02C22B13/00C22B15/00C22B30/04C22B1/11C22B19/20
CPCC22B7/02C22B7/007C22B13/045C22B13/025C22B7/001C22B15/0071C22B15/0091C22B1/11C22B30/04C22B19/22Y02P10/20
Inventor 张勤孙航宇杨洪英王志鹏杜均文胡深张登利
Owner NORTHEASTERN UNIV LIAONING
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