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Method for removing tellurium from crude selenium slag

A crude selenium and primary technology, applied in the field of purification of crude selenium slag, can solve the problems of inability to produce qualified selenium products and high tellurium content of selenium products

Active Publication Date: 2019-02-15
KUNMING DIBOO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a method for removing tellurium in coarse selenium slag, aiming at solving the problem of the tellurium content in the selenium product recovered in the prior art during the process of purifying the coarse selenium slag. Higher, the problem that qualified selenium products cannot be produced

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  • Method for removing tellurium from crude selenium slag

Examples

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Effect test

Embodiment 1

[0034] 1. Oxidation of crude selenium slag: add 30% hydrogen peroxide to tap water to dilute it into a 15% hydrogen peroxide solution, then add the hydrogen peroxide solution to the coarse selenium slag and stir. The tellurium content in the thick selenium slag is 1.57%. According to the reaction of the amount of tellurium contained in the thick selenium slag with the oxidizing agent, the ratio of the required oxidizing agent is calculated, and the concentration of 6% of the thick selenium slag weight is 15% hydrogen peroxide added to the crude selenium slag. In the selenium slag, stir it to make it mix evenly, and the oxidation reaction of tellurium occurs; then add NaOH to the solution for neutralization, and adjust the pH value to 5;

[0035] 2. The material after the oxidation reaction is melted: the material obtained in step 1 is added to the heating container, and heated to 260°C to melt it. After melting, the form of selenium remains unchanged, while the form of telluriu...

Embodiment 2

[0038] 1. Oxidation of crude selenium slag: add 30% hydrogen peroxide to tap water to dilute it into a 15% hydrogen peroxide solution, then add the hydrogen peroxide solution to the coarse selenium slag and stir. The tellurium content in the thick selenium slag is 1.57%. According to the reaction of the amount of tellurium contained in the thick selenium slag with the oxidizing agent, the ratio of the required oxidizing agent is calculated, and the concentration of 7% of the thick selenium slag weight is 15% hydrogen peroxide added to the crude selenium slag. In the selenium slag, stir it to make it mix evenly, and the oxidation reaction of tellurium occurs; then add KOH to the solution for neutralization, and adjust the pH value to 6;

[0039] 2. The material after the oxidation reaction is melted: the material obtained in step 1 is added to a heating container, and heated to 280°C to melt it. After melting, the form of selenium remains unchanged, while the form of tellurium c...

Embodiment 3

[0042]1. Oxidation of crude selenium slag: Add 30% hydrogen peroxide to tap water to dilute it into a 20% hydrogen peroxide solution, then add the hydrogen peroxide solution to the coarse selenium slag and stir. The tellurium content in the thick selenium slag is 1.57%. According to the reaction of the amount of tellurium contained in the thick selenium slag with the oxidizing agent, the ratio of the required oxidizing agent is calculated, and the concentration of 5% of the thick selenium slag weight is 20% hydrogen peroxide added to the crude selenium slag. In the selenium slag, stir it to make it mix evenly, and the oxidation reaction of tellurium occurs; then add NaOH to the solution for neutralization, and adjust the pH value to 6;

[0043] 2. The material after the oxidation reaction is melted: the material obtained in step 1 is added to the heating container, and heated to 240°C to melt it. After melting, the form of selenium remains unchanged, while the form of tellurium...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02
CPCC01B19/02
Inventor 戴卫平陈巍郑春阳韩龙速斌李建国陈浩李红
Owner KUNMING DIBOO TECH
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