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Method for separating and extracting selenium from copper smelting wet process dust collection acid mud

A technology of wet dust and acid mud collection, applied in the direction of element selenium/tellurium, etc., to achieve the effect of simple operation method, high purity and low price

Inactive Publication Date: 2014-04-16
JINCHUAN GROUP LIMITED
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AI Technical Summary

Problems solved by technology

In the cycle of acid mud returning to the silo for smelting, a large amount of selenium will be dispersed in various processes and lost

Method used

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  • Method for separating and extracting selenium from copper smelting wet process dust collection acid mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] ① Weigh 500g of acid mud, which contains 1.08% selenium (mass fraction), and wash it with 3000ml of 1% dilute sodium hydroxide solution at 30°C for 0.5h.

[0021] ② Without filtering, set the electric heating plate to heat to 70°C, then add 40g / L sodium sulfite, keep stirring for 1 hour, and then filter. The leaching residue contains 0.13% selenium, and the leaching rate of selenium is 90.2% based on the slag.

[0022] ③ Take 2000ml leach solution, add a certain amount of dilute sulfuric acid to adjust the pH value of the leach solution to 4.5. Heating, boiling, aging, filtering, the volume of the solution after analysis is 1900ml, the selenium content in the solution after analysis is 0.030g / L, and the crude selenium product obtained after drying contains 92.5% selenium.

[0023] In this example, the leaching rate of selenium was 90.2%, and the purity of crude selenium was 92.5%.

Embodiment 2

[0025] ① Weigh 500g of acid mud, which contains 1.22% selenium (mass fraction), and wash it with 4000ml of 1% dilute sodium hydroxide solution at 40°C for 1h.

[0026] ② Without filtering, set the electric heating plate to heat to 80°C, then add 60g / L sodium sulfite, keep stirring for 1 hour and then filter. The leaching residue contains 0.14% selenium, and the leaching rate of selenium is 91.6% based on the slag.

[0027] ③ Take 3000ml leach solution, add a certain amount of dilute sulfuric acid to adjust the pH value of the leach solution to 5.0. Heating, boiling, aging, filtering, the volume of the solution after analysis is 2800ml, the selenium content in the solution after analysis is 0.050g / L, and the crude selenium product obtained after drying contains 94.3% selenium.

[0028] In this example, the leaching rate of selenium was 91.6%, and the purity of crude selenium was 94.3%.

[0029] The experimental data in the two examples are shown in Table 1 below:

[0030] T...

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Abstract

The invention relates to a method for separating and extracting selenium from copper smelting wet process dust collection acid mud. The method is characterized by comprising the following extraction steps: (1), copper smelting wet process dust collection acid mud is washed by adopting sodium hydroxide as a detergent, and acid and soluble sulfate adsorbed by the acid mud are washed away; (2), the washed acid mud is leached by adopting sodium sulfite as a leaching agent, selenium is dissolved in an alkaline sodium sulfite solution to generate easily-water-soluble selenosulfate, while copper, nickel and iron are still preserved in leached slag in solid states;(3), sulfuric acid is added to a leaching solution for resolution, and the solution is subjected to heating, boiling, aging, filtering and drying so as to obtain selenium powder. The method provided by the invention is suitable for the treatment of the copper smelting wet process dust collection acid mud, is also applicable to the treatment of acid mud generated by copper smelting fume sulfuric acid production system and the treatmen of Venturi mud generated during the smelting process of rare and precious metal, and is used for recovering the selenium in the acid mud.

Description

technical field [0001] A method for separating and extracting selenium from copper smelting wet dust collection acid sludge, suitable for treating copper smelting wet dust collection acid sludge, and also suitable for acid sludge and rare precious metal smelting process produced by copper smelting flue gas sulfuric acid production system The treatment of Venturi sludge produced in the process is used to recover selenium in the acid sludge. Background technique [0002] During the copper concentrate smelting process, when the temperature reaches 500°C to 600°C, part of the selenium compound is oxidized, and the selenium volatilizes in the form of SeO2. As the flue gas and dust enter the flue gas wet purification system, during the purification process, the sulfur trioxide and sulfur dioxide in the flue gas generate sulfuric acid and sulfurous acid respectively, and the oxides in the flue dust react with the acid to form sulfate (in the form of copper sulfate Mainly), at the ...

Claims

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Application Information

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IPC IPC(8): C01B19/02
Inventor 赵书运王书友赵祥麟苏俊敏王丽娜徐文芳张鹏张妮冯艳
Owner JINCHUAN GROUP LIMITED
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