Treatment method of copper secondary source smelting soot

A technology for secondary resources and treatment methods, which is applied in the field of effective treatment of copper secondary resource smelting soot, which can solve problems such as high reactor pressure, polluted operating environment, and easy volatilization of ammonia water, and achieves inhibition of dissolution, low corrosion, and environmental friendliness Effect

Active Publication Date: 2015-12-23
CENT SOUTH UNIV
5 Cites 10 Cited by

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Problems solved by technology

Although this method has the characteristics of high debromination efficiency, the debromination temperature is 300°C and above, and the pressure of the reactor is relatively...
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Abstract

The invention discloses a treatment method of copper secondary source smelting soot. According to the treatment method, copper secondary source smelting soot is subjected to pressure oxidation leaching in a low-concentration sodium hydroxide system, bromine enters the solution, tin subjected to pressure oxidation enters oxidation leaching residues together with copper and zinc, bromine entering the solution is subjected to pH regulation by oxalic acid and precipitated by lead acetate, and the solution is returned to a basic pressure oxidation leaching system; and tin, copper and zinc entering the oxidation leaching residues are leached by a sulfuric acid system, copper and zinc enter the solution and are further separated and extracted, and tin is enriched in the residue in a form of tin dioxide to be recovered and extracted. By adopting basic pressure oxidation leaching, efficient leaching of bromine in the copper secondary source smelting soot is realized, and the bromine leaching rate is more than or equal to 92%; by further oxidizing tin in the soot, dissolution of tin in the sulfuric acid system is inhibited, so that tin is easily separated from copper and zinc in the sulfuric acid leaching process; and by precipitating bromine with lead acetate, efficient bromine removal is realized, and the bromine precipitation rate is more than or equal to 95%.

Application Domain

Technology Topic

BromineLead acetate +11

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  • Treatment method of copper secondary source smelting soot

Examples

  • Experimental program(1)

Example Embodiment

[0019] Example 1:
[0020] Copper secondary resource smelting soot finely ground to a particle size of less than 0.149mm, its main components are (%): Cu4.09, Zn33.98, Br1.48, Sn6.06 and Pb22.68; industrial grade sodium hydroxide, of which The content of sodium hydroxide ≥96%; industrial grade sulfuric acid, of which H 2 SO 4 Content ≥98%; industrial grade oxygen, of which O 2 Content ≥99%; industrial grade oxalic acid, of which H 2 C 2 O 4 Content ≥99.5%; industrial grade lead acetate, of which C 4 H 6 O 4 Pb·3H 2 O content ≥98%.
[0021] Weigh 8g of industrial-grade sodium hydroxide and make a solution with 1000ml of water, then add 200g of copper secondary resource smelting soot with the above composition to slurry, add the slurry solution to the autoclave, seal the reactor and start stirring and heating, when the reactor When the temperature rises to 120°C, oxygen is introduced, and the partial pressure of oxygen is controlled to 0.20MPa. After 3 hours of reaction, the temperature is cooled down. When the temperature drops to 50°C, the pressure in the reactor is removed, and the reactor is opened for filtration. 982ml bromine-containing solution, the main component (g/L) is: Br2.82g/L; the oxidation leaching residue is dried and weighed 189.6g, of which the main component is calculated as a weight percentage (%): Cu4.21, Zn35.51, Sn6.39, Pb23.87.
[0022] Take 900ml of the above bromine-containing solution, add 10.0g of oxalic acid to adjust the pH of the solution to 3.2, stir and react at 90°C for 1h, add 9.0g of lead acetate, react for 0.5h, and filter to obtain 11.45g of bromine residue, in which the bromine content is The mass percentage is 21.62%.
[0023] Take 185g of the oxidation leaching residue obtained by pressurized oxidation, add 1000ml of sulfuric acid solution with 10g/L sulfuric acid concentration, react at 75℃ for 3h and then filter to obtain 960ml of copper-zinc leaching solution. Its main components (g/L) are : Cu7.95, Zn66.72; the obtained tin slag weighs 80.32g after drying, and its main components are (%) in weight percentage: Sn14.52, Pb54.26. The copper-zinc leaching solution is sent to the subsequent separation and extraction of copper and zinc, and the tin slag is sent to recover tin.
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