Technology for extracting and separating copper and tellurium from copper and tellurium slag
A tellurium slag and process technology, applied in the field of separation and extraction of copper and tellurium, can solve the problems of long production cycle and large capital occupation, and achieve the effects of good product quality, small site occupation area and low labor intensity.
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Embodiment 1
[0042]A process for extracting and separating copper and tellurium from copper-tellurium slag, the process specifically includes the following steps:
[0043] ① Alkali leaching of tellurium by oxidation: Disperse the copper tellurium slag in the NaOH solution with a mass concentration of 12% according to the liquid-solid ratio of 7:1, adopt the blast oxidation method, the oxidation temperature is 85°C, and the oxidation time is 4h. After filtration, the alkali leaching solution and Alkali leaching residue; after the alkaline leaching solution is neutralized by sulfuric acid, primary tellurium dioxide is obtained;
[0044] ②Acid leaching to remove copper and tellurium: leaching the above alkali leaching residue in c(H + ) in the acid solution of 2.0mol / L, add oxidizing agent sodium chlorate, the mass concentration of sodium chlorate is 14%, oxidation temperature 85 ℃, oxidation time 4h, filter to obtain filtrate and filter residue;
[0045] ③Separation of tellurium: After step...
Embodiment 2
[0053] A process for extracting and separating copper and tellurium from copper-tellurium slag, the process specifically includes the following steps:
[0054] ① Alkali leaching of tellurium by oxidation: Disperse the copper tellurium slag in the NaOH solution with a mass concentration of 18% according to the liquid-solid ratio of 6:1, adopt the blast oxidation method, the oxidation temperature is 80°C, and the oxidation time is 5h. After filtration, the alkali leaching solution and Alkali leaching residue; after the alkaline leaching solution is neutralized by sulfuric acid, primary tellurium dioxide is obtained;
[0055] ②Acid leaching to remove copper and tellurium: leaching the above alkali leaching residue in c(H + ) 2.5mol / L acid solution, add oxidizing agent sodium sulfate, the mass concentration of sodium sulfate is 18%, oxidation temperature 80 ℃, oxidation time 5h, filter to obtain filtrate and filter residue;
[0056] ③Separation of tellurium: After step ② is compl...
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