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A kind of treatment method of tellurium-containing waste liquid

A treatment method and waste liquid technology, applied in the direction of improvement of process efficiency, binary selenium/tellurium compound, selenium/tellurium oxide/hydroxide, etc., can solve the problem of high copper powder price, high cost, and low external sales price and other problems, to achieve high copper-tellurium comprehensive recovery rate, good copper-tellurium separation effect, and increase economic benefits

Active Publication Date: 2021-05-07
YANGGU XIANGGUANG COPPER
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Due to the high acid concentration and high reaction temperature (greater than 90° C.) in the solution after immersion in silver and selenium, part of the copper powder will react and dissolve with sulfuric acid when replacing tellurium, resulting in a large consumption of copper powder (the theoretical amount of copper powder required for replacing tellurium is 3 times), the utilization rate is low
Moreover, the price of copper powder is relatively high, which is generally the price of cathode copper plus a processing fee of 0.8-10,000-10,000 / t, while copper powder replaced by copper telluride is only a semi-finished product, and the price for external sales is relatively low, resulting in the cost of the above-mentioned treatment method being relatively high. high

Method used

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  • A kind of treatment method of tellurium-containing waste liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 1. Concentrated crystallization

[0058] Transferred 500L copper anode slime high-pressure decopper treatment produced silver selenium after the liquid, composition: Cu 32.92g / L, Te2.89g / L, Se 0.06g / L, As 6.53g / L, Bi 0.20g / L, h 2 SO 4 198.1g / L. Concentrate at high temperature, crystallize, and filter to obtain copper sulfate crystals and 240L of crystallization mother liquor. Obtain 46kg of copper sulfate crystals, which contain 25.5% Cu. Main element content in the crystallization mother liquor: Cu 18.58g / L, Te 5.81g / L, Se 0.08g / L, As 13.44g / L.

[0059] 2. Restore

[0060] Add 16.85 kg (1.2 mol / L) of table salt and 4.20 kg of reducing agent sodium sulfite (3 times the theoretical amount) to the obtained crystallization mother liquor. The reduction temperature is 80°C and the reaction time is 1.5 h to reduce tellurium into the slag to obtain the reduced slag. (tellurium and cuprous chloride) 2.67kg, wherein 99% of tellurium is reduced and enters the reduction sla...

Embodiment 2

[0071] 1. Concentrated crystallization

[0072] Transfer 500L silver selenium solution, composition: Cu 42.02g / L, Te 3.41g / L, Se 0.051g / L, As 6.13g / L, Bi 0.099g / L, H 2 SO 4140.16g / L. Concentrate, crystallize, and filter to obtain 62.2 kg of copper sulfate crystals, which contain 24.5% of Cu. Obtain 220L of crystallization mother liquor, mother liquor composition: Cu 26.16g / L, Te 7.377g / L, Se 0.083g / L, As 11.99g / L, Bi0.24g / L.

[0073] 2. Restore

[0074] In the obtained crystallization mother liquor, add salt 12.5kg (1mol / L), reducing agent sodium sulfite 6.5kg (4 times of theoretical amount), reduction temperature 80 ℃, reaction time 1.5h, tellurium is reduced in the slag, obtains the reduction slag ( tellurium and cuprous chloride) 3.66kg, reduction slag composition: Cu 25.66%, Te 44.06%, Se 0.68%, As 0.039%, Bi<0.001%. 220L of the reduced liquid was obtained, and its composition included: Cu 21.6g / L, Te 0.049g / L, Se 0.0012g / L, As 15.36g / L, Bi 0.25g / L. 99% of the tellur...

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Abstract

The invention provides a treatment method for tellurium-containing waste liquid, comprising the following steps: S1, concentrating and crystallizing the tellurium-containing waste liquid to obtain copper sulfate and crystallization mother liquor respectively; the tellurium-containing waste liquid contains tellurium element, copper element and sulfuric acid ; S2, reducing the crystallization mother liquor with a reducing agent to obtain tellurium-copper slag and a reduced solution respectively; S3, using an acid solution and an oxidant, performing acidic oxidation leaching on the tellurium-copper slag to obtain an acidic leachate; the acid solution It is a hydrochloric acid solution or a sulfuric acid solution; S4, separating the solid and liquid of the acidic leaching solution, taking the liquid phase and adjusting the pH value to 12-14 with sodium hydroxide, and at the same time raising the temperature to a boiling state for reaction to obtain an alkaline conversion solution; S5, the The alkaline conversion solution is subjected to acidic hydrolysis to obtain a tellurium dioxide product. The technical scheme realizes step-by-step recovery of copper and tellurium, has good separation effect of copper and tellurium, high comprehensive recovery rate of copper and tellurium, low cost, and increases economic benefits.

Description

technical field [0001] The invention relates to the technical field of tellurium-containing material treatment, in particular to a treatment method for tellurium-containing waste liquid. Background technique [0002] Tellurium is a rare element, and its abundance is almost the smallest among all metals and nonmetals. Tellurium has a wide range of uses, metallurgy, rubber, petroleum, electronic appliances, pigments, glass ceramics, medicine and other industries are its traditional application fields, and military, aerospace, and computer are its new application fields. The content of tellurium in nature is very low, there are few separate mines, and it is mainly associated with chalcopyrite. Tellurium is generally extracted from copper anode slime, waste liquid or bismuth refining slag. Among them, the main component of copper anode slime is copper (Cu), and it is rich in selenium (Se), tellurium (Te), gold (Au) , silver (Ag) and other elements with recycling value, which a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/04C01G3/10C01G3/12C01G3/02C22B7/00C22B15/00
CPCC01B19/004C01G3/02C01G3/10C01G3/12C22B7/00C22B7/007C22B15/00Y02P10/20
Inventor 陈一恒丁成芳郭步贺余华清
Owner YANGGU XIANGGUANG COPPER
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