Method for extracting tellurium from copper-tellurium slag

A technology of tellurium slag and copper sulfide, which is applied in the field of tellurium extraction, can solve the problems of lengthy process, low tellurium recovery rate, and large environmental pollution, and achieve the effects of shortening the process flow, benefiting environmental protection, and producing no three wastes

Inactive Publication Date: 2018-11-23
KUNMING DIBOO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

These treatment methods require the use of acid solution and alkali solution. The process generally includes oxidative acid leaching, alkali leaching separation, solid-liquid separation, calcination, reduction, etc., which generally have high requirements for solution and material conditions, complex processes, lengthy processes, and long cycles. Not only the application is limited, but the separation degree of copper and tellurium is also low, and the recovery rate of tellurium is not high
At the same time, a large amount of long-term use of acid and alkali solutions will also bring about major environmental pollution problems.

Method used

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  • Method for extracting tellurium from copper-tellurium slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]Step 1. Heat 500kg copper tellurium slag (containing Te ~ 28%) in a container to 600°C to make it melt, then gradually add 50kg of carbon powder during the stirring process, the reaction will not proceed after 2 hours, stop heating and stirring, and let it stand. Set to cool to obtain copper tellurium slag reduction product.

[0037] Step 2. After crushing the reduction product obtained in step 1, mix it with 45kg of sulfur and place it in a container for heating while stirring. The temperature is controlled at about 440°C, and the reaction time is 1h to replace tellurium from the copper-tellurium slag. , to obtain a mixture of tellurium and copper sulfide.

[0038] Step 3: Put the mixture of tellurium and copper sulfide in a vacuum furnace with a pressure of 70 Pa and a distillation temperature of 1450°C. Distill under these conditions for 4 hours to obtain 137.50 kg of volatile matter and 294.55 kg of residue.

[0039] After analysis, the volatile matter contains 99.4...

Embodiment 2

[0041] Step 1. Heat 500kg of copper tellurium slag (tested to contain Te ~ 28%) in a container to 550°C to melt it, stir and gradually add 40kg of carbon powder. After 2.5 hours of reaction, no reaction occurs, stop heating and stirring, and let it stand. Set aside to cool.

[0042] Step 2: After crushing the copper-tellurium slag obtained from the reduction, mix it with 40kg of sulfur and heat it in a container. The temperature is controlled at about 400°C for sulfidation. The reaction time is 1.5h, and the tellurium is replaced from the copper-tellurium slag to obtain tellurium and copper sulfide mixture.

[0043] Step 3: Put the mixture of tellurium and copper sulfide in a vacuum furnace, control the pressure in the furnace to 50 Pa, and distill at a distillation temperature of 1250°C for 5 hours. Obtained 136.60kg of volatile matter and 289.80kg of residue.

[0044] After analysis, the volatile matter contained 99.53% tellurium, and the residue contained 1.21% tellurium....

Embodiment 3

[0046] Step 1. After mixing 500kg of copper tellurium slag (Te ~ 28% detected) and 30Kg of carbon powder evenly, slowly heat to 500°C in a container to melt and reduce it. The reaction time is 3h and no longer reacts. Stop heating and cooling.

[0047] Step 2: The copper telluride obtained by reduction is crushed and mixed with 35kg of sulfur, and then heated in a closed container at a controlled temperature of about 360°C. The reaction time is 2 hours, and the tellurium is replaced from the copper tellurium slag to obtain tellurium and copper sulfide. mixture.

[0048] Step 3: Put the mixture of tellurium and copper sulfide in a vacuum furnace, control the pressure in the furnace to 30 Pa, and distill at a distillation temperature of 1050°C for 6 hours. After vacuum distillation, 136.10kg of volatile matter and 277.45kg of residue were obtained.

[0049] After analysis, the volatile matter contains 99.59% tellurium, and the residue contains 1.39% tellurium.

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Abstract

The invention belongs to the technical field of vacuum metallurgy, and discloses a method for extracting tellurium from copper-tellurium slag. The method is characterized in that the copper-telluriumslag is subjected to reduction by adding a reducing agent, and the tellurium is extracted through the vulcanization and vacuum distillation processes. The method comprises the following steps that firstly, the copper-tellurium slag and the reducing agent are subjected to reduction reaction in a vessel so as to obtain reduced copper-tellurium slag; then the reduced product and a vulcanizing agent are mixed according to a certain ratio, and heating is carried out for vulcanization reaction so as to obtain a vulcanized product with the tellurium and a copper sulfide substance mixed; and the obtained vulcanized product is put in a vacuum furnace for vacuum distillation so as to obtain the elemental tellurium and copper sulfide slag. The method has the advantages that the copper-tellurium slagis subjected to the three processes of reducing, vulcanizing and distilling, so that efficient extraction of the tellurium in the copper tellurium slag is realized; and the method is suitable for thecopper-tellurium slag with complex components, acid-base solutions are not used in the process, so that no waste water is generated, pollution to the environment is avoided, through the experimental verification, the purity of the tellurium obtained by using the method is 98-99.9%, and the direct yield reaches 96% or above.

Description

technical field [0001] The invention relates to a method for extracting tellurium from copper-tellurium slag, which belongs to the technical field of vacuum metallurgy. Background technique [0002] Tellurium is a kind of scattered metal. Most tellurium ores in nature are associated with copper, lead, gold, silver and other minerals. It is extremely difficult to form independent deposits, and tellurium often forms Cu with copper, silver and gold. 2 Te, Ag 2 Te, Au 2 In the electrolytic refining of copper, nickel and lead, these compounds do not undergo electrolysis and sink into the anode slime. Usually 80% of tellurium is extracted from the anode slime produced in the copper electrolytic refining process. Copper tellurium slag is an intermediate product obtained in the process of processing copper anode slime. Its main component is copper telluride, which can be used as an important raw material for extracting tellurium . [0003] The high-tellurium copper slag rich in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02
Inventor 陈巍杨斌戴卫平范茂雄郑春阳韩龙李红李建国速斌
Owner KUNMING DIBOO TECH
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