A kind of method for removing tellurium in coarse selenium slag

A crude selenium, primary technology, applied in the field of crude selenium slag purification, can solve the problems of not being able to produce qualified selenium products and high tellurium content of selenium products
CN109336068BActive Publication Date: 2020-03-24KUNMING DIBOO TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
KUNMING DIBOO TECH
Publication Date
2020-03-24

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Abstract

The invention discloses a method for removing tellurium from crude selenium slag. The method comprises the following steps: an oxidizing agent is added to the crude selenium slag and stirred, a primary product is obtained after tellurium in the crude selenium slag is subjected to a reaction with the oxidizing agent, vacuum distillation is performed on the primary product to enable selenium in theselenium slag to be volatilized while tellurium is not volatilized, and a selenium product with low tellurium content is obtained by recovery. The oxidizing agent is added to the crude selenium slag and subjected to an oxidation reaction with tellurium in the crude selenium slag, and accordingly, form of tellurium is changed; based on the property difference between tellurium oxide in the changedform and selenium in a vacuum state, tellurium is removed from selenium by vacuum distillation, content of tellurium in selenium is reduced, and the selenium product with purity higher than 99.9% is obtained.
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Description

technical field

[0001] The invention relates to the field of purification of coarse selenium slag, in particular to a method for removing tellurium from coarse selenium slag. Background technique

[0002] Selenium is an important semiconductor material with a melting point of 221°C and a boiling point of 685°C. In industry, the oxygen combustion-reduction method is often used to remove tellurium in crude selenium, that is, under high temperature conditions, selenium is volatilized as selenium dioxide, condensed and collected, and then selenium dioxide is dissolved in water to adjust the pH value to 4-5. Precipitate tellurite, adjust the pH value of the filtrate to 1-0.5, and then pass through sulfur dioxide or sodium sulfite for reduction to obtain selenium powder. The recovery rate of selenium in this method is low, only about 90%, and selenium dioxide and sulfur dioxide are produced, polluting the environment.

[0003] Patent CN1283549C discloses a process for extracting...

Claims

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