Method for extracting tellurium dioxide from anode slime produced through tellurium electro-deposition

A technology of tellurium dioxide and anode slime, applied in the directions of selenium/tellurium oxide/hydroxide, binary selenium/tellurium compound, etc., can solve the problems of low tetravalent tellurium conversion rate, poor working conditions, and large equipment corrosion. , to achieve the effect of less residual tellurium in slag, improved working environment and lower cost

Active Publication Date: 2016-03-16
湖南省金润碲业有限公司
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Problems solved by technology

The disadvantage of using this method is that the conversion rate of tetravalent tellurium is low, and the conversion rate is generally about 60%. A large amount of tellurium remains in t

Method used

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Embodiment Construction

[0015] The method of the present invention is described in detail below.

[0016] The method for extracting tellurium dioxide from anode slime produced by tellurium electrowinning comprises the following steps:

[0017] (1) Put the anode slime into the reaction kettle and add water so that the solid-liquid ratio is 1:6, then add sodium hydroxide whose weight is 5% of the dry weight of the anode slime, heat and stir for two hours and press filter to obtain the filter residue, which is tellurium trioxide ;

[0018] (2) Put the filter residue into the reaction kettle and add water to make the solid-liquid ratio 1:6, adjust the pH value to 1.5 with sulfuric acid, heat to 85°C and stir for two hours, press filter to obtain the filtrate;

[0019] (3) Add the filtrate to the reaction kettle, add iron powder, and stir for three hours;

[0020] (4) After the solution is clear and transparent, add sodium hydroxide to adjust the pH value to 7.0, then add sodium hydroxide with 70% tellu...

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Abstract

The invention discloses a method for extracting tellurium dioxide from anode slime produced through tellurium electro-deposition. The method comprises the following steps that 1, the anode slime is put into a reaction kettle, water and sodium hydroxide are added, heating and mixing are performed for two hours, and filter pressing is performed to obtain filter residues, namely the tellurium dioxide; 2, the filter residues are put into the reaction kettle, water is added, a PH value is regulated to be 1.0-1.5 by using sulfuric acid, heating is performed to reach 85 DEG C, stirring is performed for two hours, and filter pressing is performed to obtain filtrate; 3, the filtrate is added into the reaction kettle, and iron powder is added and stirred for three hours; 4, sodium hydroxide is added after the solution is clarified and transparent, the PH value is regulated to be 7.0, then sodium hydroxide with the tellurium metal content 70% is added and stirred for an hour, filter pressing is performed to obtain a sodium tellurite solution, the PH value is regulated to be 5-5.5 by using sulfuric acid, and filter pressing is performed to obtain tellurium dioxide. In the step 3, the amount of the iron powder is determined according to the tellurium content in the filtrate and meets the requirements of a reaction equation: Te<6+> + Fe<0>= Te<4+> + Fe<2+>.

Description

technical field [0001] The invention relates to a method for extracting tellurium dioxide, in particular to a method for extracting tellurium dioxide from anode slime produced by tellurium electrowinning. Background technique [0002] The anode slime produced during the production of refined tellurium by electrowinning contains a large amount of tellurium trioxide and a small amount of tellurium dioxide, which can be utilized in advance. [0003] At present, the method of extracting tellurium dioxide from the anode slime produced in the process of producing refined tellurium by electrowinning is mainly: using high-concentration sulfuric acid to convert tellurium trioxide into tellurium sulfate solution, and then adding a large amount of sodium chloride. Adding sodium sulfite under chemical conditions reduces hexavalent tellurium ions to tetravalent tellurium ions, and then adjusts the pH value with alkali to extract tellurium in the form of tellurium dioxide. The disadvanta...

Claims

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Application Information

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IPC IPC(8): C01B19/04
CPCC01B19/004
Inventor 李水林
Owner 湖南省金润碲业有限公司
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