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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 low tellurium recovery rate, complicated process, and lengthy process, and achieve the effects of environmental protection, shortened industrial process, and high elemental purity

Pending Publication Date: 2021-12-28
紫金铜业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above treatment methods all need to use acid solution and alkali solution. The process generally includes oxidative acid leaching, alkali leaching separation, solid-liquid separation, calcination, reduction, etc., which have high requirements for solution and material conditions, complicated process, lengthy process, and long cycle. , not only the application is limited, the final separation degree of copper and tellurium is also low, the recovery rate of tellurium is not high, and the use of acid and alkali solutions will also bring greater environmental pollution problems

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  • Method for extracting tellurium from copper tellurium slag

Examples

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Embodiment 1

[0018] This embodiment provides a method for extracting tellurium from copper tellurium slag, such as figure 1 As shown, it specifically includes the following steps:

[0019] Step 1. Put 300kg of copper telluride waste (tested to contain 46% Te) and 34.5Kg of sulfur in an airtight container and heat while stirring. The heating temperature is 300°C and the reaction time is 2h, and tellurium is replaced from copper telluride. , to obtain a mixed sulfide product of tellurium and copper sulfide.

[0020] 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.

[0021] After distillation, the obtained condensate of volatile matter is tellurium simple substance, its purity is about 98.48%, and the residue after distillation contains 1.98%...

Embodiment 2

[0026] This embodiment provides a method for extracting tellurium from copper tellurium slag, such as figure 1 As shown, it specifically includes the following steps:

[0027] Step 1. After mixing 500kg of copper tellurium slag (testing to contain 25% Te) and 60kg of sulfur evenly, place it in an airtight container and heat it while stirring. The heating temperature is 450°C and the reaction time is 3h. The slag is replaced to obtain a sulfide product composed of tellurium and copper sulfide.

[0028] 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.

[0029] The obtained condensate of volatile matter is tellurium simple substance, its purity is about 97.59%, and the residue after distillation contains 2.97% tellurium.

Embodiment 3

[0031] This embodiment provides a method for extracting tellurium from copper tellurium slag, such as figure 1 As shown, it specifically includes the following steps:

[0032] 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.

[0033] Add about 22kg of sulfur to the roasted copper-tellurium slag, heat it in a closed container while stirring, the heating temperature is 600°C, and the reaction time is 1.5h, and the tellurium is replaced from the copper-tellurium slag to obtain tellurium and Sulfide products composed of copper sulfide and other substances.

[0034] Step 2, place the vulcanized product in a vacuum furnace, control the pressure in the furnace to 5Pa, an...

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Abstract

The invention discloses a method for extracting tellurium from copper tellurium slag. The method comprises the following steps: vulcanizing the copper tellurium slag by using a vulcanizing agent to obtain a mixture consisting of elementary tellurium, copper sulfide and other substances, and then carrying out vacuum distillation to separate and extract tellurium. Compared with conventional methods, only one reaction substance, namely the vulcanizing agent, needs to be added for a chemical reaction, and thus, an industrial process is greatly shortened, operation is simple, a treatment period is short; and no acid-base solution is used, no three wastes are generated, and the whole process flow does not cause pollution, so environmental protection is facilitated. Practical production verifies that the purity of the elementary tellurium obtained through the method is high and reaches 97%-99.5%.

Description

technical field [0001] The invention relates to the technical field of chemical smelting, in particular to a method for extracting tellurium from copper tellurium slag. 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 long time due to t...

Claims

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Application Information

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IPC IPC(8): C01B19/02
CPCC01B19/02C01P2006/80
Inventor 邱发强张永锋陈一恒吴思鸿林家永
Owner 紫金铜业有限公司
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