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Method for extracting tellurium from copper telluride or copper-tellurium slag

A technology of copper telluride and tellurium slag, which is applied in the field of tellurium extraction, can solve the problem of high direct yield, and achieve the effects of simple operation, short process flow and shortened industrial process

Inactive Publication Date: 2018-12-21
KUNMING DIBOO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a method for extracting tellurium from copper telluride or copper tellurium slag, which solves the problems and deficiencies in the existing methods for extracting tellurium from copper telluride or copper tellurium slag, and the method is environmentally friendly , no waste water is produced in the process of extracting tellurium, the separation reaction of copper and tellurium is complete after one process, and the direct recovery rate of tellurium is high

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  • Method for extracting tellurium from copper telluride or copper-tellurium slag

Examples

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Effect test

Embodiment 1

[0030] Step 1. Put 300kg of copper telluride waste (tested to contain Te ~ 46%) and 34.5Kg of sulfur in an airtight container and heat while stirring. The heating temperature is 350°C, and the reaction time is 2h, and the tellurium is replaced from the copper telluride out to give a mixed sulfide product of tellurium and copper sulfide.

[0031] Step 2. Place the vulcanized product in a vacuum furnace, control the pressure in the furnace to 200 Pa, and distill at a distillation temperature of 1450° C., and distill for 6 hours under these conditions. After vacuum distillation, 134.1 kg of volatile matter and 199.7 kg of residue were obtained.

[0032] After distillation, the obtained condensate is tellurium simple substance, its purity is about 98.48%, and the residue after distillation contains 1.98% tellurium.

Embodiment 2

[0034] Step 1. After mixing 500kg of copper tellurium slag (tested to contain Te ~ 25%) and 60kg of sulfur evenly, place it in an airtight container and heat while stirring. The heating temperature is 450°C and the reaction time is 3h. Tellurium slag is replaced to obtain sulfide products composed of tellurium and copper sulfide.

[0035] Step 2. Place the vulcanized product in a vacuum furnace, control the pressure in the furnace to 50 Pa, and distill at a distillation temperature of 1250° C., and distill for 8 hours under these conditions. After vacuum distillation, 116.9kg of volatile matter and 411.8kg of residue were obtained.

[0036] The obtained condensate is tellurium simple substance, its purity is about 97.59%, and the residue after distillation contains 2.97% tellurium.

Embodiment 3

[0038] Step 1: Put 300kg of copper-tellurium slag (tested to contain Te ~ 25%) in a resistance furnace with tail gas treatment, heat to 650 ~ 800°C, and roast for 2 hours for pretreatment. During this process, the water in the material evaporates, and the contained salts such as sulfates decompose and volatilize, and 225 kg of the product is obtained after pretreatment.

[0039]Step 2: Add about 22kg of sulfur to the roasted copper-tellurium slag, heat it in an airtight container while stirring, the heating temperature is 550°C, and the reaction time is 1.5h to replace tellurium from the copper-tellurium slag, A sulfide product composed of tellurium and copper sulfide is obtained.

[0040] Step 3, place the vulcanized product in a vacuum furnace, control the pressure in the furnace to 20 Pa, and distill at a distillation temperature of 1050° C., and distill for 6 h under these conditions. After vacuum distillation, 71.3kg of volatile matter and 174.7kg of residue were obtaine...

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Abstract

The invention belongs to the technical field of vacuum metallurgy, and discloses a method for extracting tellurium from copper telluride or copper-tellurium slag. According to the method, a vulcanizing agent is added into the copper telluride or the copper-tellurium slag for vulcanizing, and the extraction of the tellurium is realized by means of a vacuum distillation process. The method comprisesthe following steps: 1, mixing the copper telluride or the copper-tellurium slag with the vulcanizing agent in a certain ratio, and placing in a container for carrying out a vulcanization reaction soas to obtain a vulcanized product of a mixture of elemental tellurium and copper sulfide; 2, putting the vulcanized product, obtained in the step 1, into a vacuum furnace for carrying out vacuum distillation, and separating the tellurium out from the mixture to obtain the elemental tellurium and copper sulfide slag. The extraction of the tellurium is realized by carrying out vulcanization and thevacuum distillation process on the copper telluride or the copper-tellurium slag. The method provided by the invention does not use acid and alkali solutions, and does not produce three wastes; the whole technological process is environmentally-friendly and does not cause environmental pollution; the actuarial production proves that the purity of the obtained elemental tellurium reaches up to 97-99.9%.

Description

technical field [0001] The invention relates to a method for extracting tellurium from copper telluride or copper tellurium slag, belonging to the technical field of vacuum metallurgy. Background technique [0002] Tellurium is a kind of scattered metal. Tellurium in nature is extremely difficult to form independent deposits. Most of it is associated with copper, lead, gold, silver and other minerals. 2 Te, Ag 2 Te, Au 2 Exist in the form of compounds such as Te. In the electrolytic refining of copper, nickel and lead, these compounds do not undergo electrolysis and sink into the anode slime. Copper tellurium slag is an intermediate product obtained in the process of processing copper anode slime. The main component of copper tellurium slag obtained in some processes is tellurium Copper oxide can be used as an important raw material for extracting tellurium. However, the high-tellurium copper slag rich in rare and precious metals has been piled up and backlogged for a lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02
CPCC01B19/02C01P2006/80
Inventor 陈巍杨斌戴卫平韩龙郑春阳范茂雄李建国陈浩速斌
Owner KUNMING DIBOO TECH
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