Method for treating tellurium-containing waste liquor

A treatment method and technology for waste liquid, which are applied in the improvement of process efficiency, binary selenium/tellurium compounds, selenium/tellurium oxides/hydroxides, etc., can solve the problem of high copper powder price, high cost and low export price and other problems, to achieve the effect of high comprehensive recovery rate of copper and tellurium, good separation effect of copper and tellurium, and increased economic benefits.

Active Publication Date: 2018-09-18
YANGGU XIANGGUANG COPPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 utili...

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  • Method for treating tellurium-containing waste liquor

Examples

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 Cu 25.5%. 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 reducing 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 tellurium i...

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Abstract

The invention provides a method for treating tellurium-containing waste liquor. The method comprises the following steps: S1, the tellurium-containing waste liquor is concentrated and crystallized forobtaining copper sulfate and crystallization mother liquor respectively, and the tellurium-containing waste liquor contains elements of tellurium and copper and sulfuric acid; S2, the crystallizationmother liquor is reduced with a reducing agent, and tellurium-copper slag and reduced liquor are obtained respectively; S3, an acid solution and an oxidant are adopted for acid oxidation leaching onthe tellurium-copper slag, an acid leaching solution is obtained, and the acid solution is a hydrochloric acid solution or a sulfuric acid solution; S4, the acid leaching solution is subjected to solid-liquid separation, a liquid phase is taken, pH is adjusted with sodium hydroxide to 12-14, heating is performed to a boiling state for reaction, and an alkaline conversion solution is obtained; S5,the alkaline conversion solution is subjected to acidic hydrolysis, and a tellurium dioxide product is obtained. Copper and tellurium are recovered step by step by the technical scheme, the separationeffect of copper and tellurium is good, the comprehensive recovery rate of copper and tellurium is high, the cost is low, and the economic benefit is increased.

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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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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