Technology for extracting and separating copper and tellurium from copper and tellurium slag
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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.
Active Publication Date: 2017-09-08
永兴鑫裕环保镍业有限公司
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However, the production cycle of refined tellurium in this process is long, and the cycle of electrowinning is 12 to 15 days. Facing the market with large fluctuations, there are great risks and a large amount of capital is occupied
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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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Abstract
The invention belongs to the field of heavy metal recovery, and specifically discloses a technology for extracting and separating copper and tellurium from copper and tellurium slag. The technology comprises the following steps that oxidizing and alkaline leaching are conducted to obtain tellurium; the copper and the tellurium are separated out through acid pickling; the tellurium is separated; the copper is electrodeposited; low-acid oxidizing is conducted; dissolving and purifying are conducted; a solution is prepared through dissolving; the tellurium is subjected to eddy electrodepositing; and a tellurium plate is subjected to ingot casting. The technology adopts a titanium-iridium electrode plate, therefore, a solution with the copper can be subjected to electrodepositing directly, and the condition that an electrolyte includes Cl-, NO3- and the like does not need to be worried about, namely electrodeposited copper with the copper content greater than 99.9% can be obtained, the electrodeposited copper can be sold directly, and thus the extracting technological process of the copper is shortened; and traditional tellurium electrodepositing is changed to eddy electrodepositing, the period of electrodepositing can be shortened by 5-8 times, moreover, the electric current efficiency is high, the yield is large, the product (refined tellurium with the tellurium content greater than 99.99%) quality is good, the problem that the period of turnover of capital is long is solved, and coping with the influence brought by market fluctuations to sales is facilitated.
Description
technical field [0001] The invention belongs to the field of heavy metal recovery, in particular to a process for extracting and separating copper and tellurium from copper tellurium slag. Background technique [0002] The copper-tellurium slag comes from the precipitated slag obtained by replacing the tellurium in the solution with copper powder in the copper anode slime treatment process. Because of its high copper content, it is commonly known as copper tellurium slag. Tellurium in this kind of slag is copper telluride (CuTe), cuprous telluride (Cu 2 Te), metal tellurium and other forms exist. The traditional process for treating this kind of slag is acid leaching to remove copper and then alkali leaching to extract tellurium, but the separation is not complete at one time, and copper and tellurium need to be repeatedly leached for many times. Copper-containing liquid is added with iron powder to make sponge copper, and tellurium is neutralized to form primary telluriu...
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