Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation method of high-purity selenium

A technology of high-purity selenium and crude selenium, applied in the direction of elemental selenium/tellurium, etc., can solve the problems of low direct yield of high-purity selenium, difficult separation of selenium and tellurium, etc., and achieve the effect of simple process, high purity of selenium, and high-efficiency removal

Active Publication Date: 2021-06-11
KUNMING UNIV OF SCI & TECH
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, in view of the technical demands of directly preparing high-purity selenium from industrial-grade coarse selenium slag, the direct yield of high-purity selenium by traditional purification methods is low, and the difficulty of separating selenium and tellurium is still the technical bottleneck in the field

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of high-purity selenium
  • A kind of preparation method of high-purity selenium
  • A kind of preparation method of high-purity selenium

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] The invention provides a kind of preparation method of high-purity selenium, comprises the following steps:

[0026] Slurrying the coarse selenium slag to obtain selenium mud; the mass percentage of Se in the coarse selenium slag is 60-95%;

[0027] Adjusting the pH value of the selenium slurry, adding an oxidizing agent to the oxidation potential, followed by precipitation reaction and filtration to obtain primary selenium; the oxidation potential is 400-700mV;

[0028] Melting the primary selenium to obtain a selenium melt;

[0029] The selenium melt is subjected to vacuum distillation to obtain high-purity selenium.

[0030] In the present invention, unless otherwise specified, each component is a commercially available product well known to those skilled in the art.

[0031] The invention adjusts the coarse selenium slag to obtain the selenium slurry.

[0032] In the present invention, in terms of mass percentage, the coarse selenium slag preferably further inclu...

Embodiment 1

[0056] The coarse selenium slag comprises the following components in mass percentage: Se 75.04%, Te 7.08%, Pb 5.78%, Cu6.7%, water 3.9%, and the balance is other trace impurities and salts; the coarse selenium slag particle size is 100 ~200μm;

[0057] First, 1kg of coarse selenium slag and deionized water are mixed at a solid-to-liquid ratio of 1:1 to obtain selenium slurry;

[0058] Adjust the obtained selenium mud to a pH value of 1 with a mass fraction of 40% dilute sulfuric acid, add 209 mL of hydrogen peroxide with a mass concentration of 15% as an oxidant, and adjust the potential of the system to 500 mV. After fully stirring for 30 min, wash with water to The pH value of the system is 7, and after pressure filtration, it is placed in a vacuum drying oven and dehydrated under reduced pressure at 100°C and 500Pa to obtain primary selenium;

[0059] The obtained primary selenium was smelted at 400° C. for 60 minutes until the selenium powder was completely melted into a...

Embodiment 2

[0066] The coarse selenium slag includes the following components in mass percentage: Se 90.23%, Te 3.08%, Pb 1.20%, Cu1.7%, water 2.9%, and the balance is other trace impurities and salts; the coarse selenium slag particle size is 150 ~250μm;

[0067] First, 1kg of coarse selenium slag and deionized water are mixed at a solid-to-liquid ratio of 1:2 to obtain selenium slurry;

[0068] Adjust the obtained selenium slurry to a pH value of 2 with a mass fraction of 30% dilute sulfuric acid, add 293 mL of hydrogen peroxide with a mass concentration of 15% as an oxidant, and adjust the potential of the system to 550 mV. After fully stirring for 50 min, wash with water to The pH value of the system is 7, and after pressure filtration, it is placed in a vacuum drying oven and dehydrated under reduced pressure at 100°C and 500Pa to obtain primary selenium;

[0069] The obtained primary selenium was smelted at 350° C. for 90 minutes until the selenium powder was completely melted into...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
purityaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of metallurgical purification, in particular to a method for preparing high-purity selenium. The invention provides a method for preparing high-purity selenium, comprising the following steps: adjusting the coarse selenium slag to obtain selenium mud; the mass percentage of Se in the coarse selenium slag is 60-95%; After adjusting the pH value of the selenium slurry, adding an oxidant to the oxidation potential, followed by precipitation reaction and filtration, to obtain primary selenium; the oxidation potential is 400-700mV; melting the primary selenium to obtain a selenium melt; The melt is vacuum distilled to obtain high-purity selenium. The test results of the embodiments show that the high-purity selenium that can be directly obtained from the coarse selenium slag by using the method provided by the invention realizes the efficient removal of impurity elements in the coarse selenium slag; the purity of the high-purity selenium reaches 99.9996%; the method is simple and easy Operate and master.

Description

technical field [0001] The invention belongs to the technical field of metallurgical purification, in particular to a method for preparing high-purity selenium. Background technique [0002] Selenium is an important scattered metal. The demand for selenium in aerospace, atomic energy, solar energy, electronic semiconductors, and health fields is increasing day by day. Selenium has become a key material supporting high-tech development and new product development, and has important strategic significance. [0003] At present, the well-known selenium purification processes are divided into physical methods and chemical methods. Common chemical methods include selenium oxidation and volatilization-sulfur dioxide reduction method, sulfite cycle method, hydrogen selenide thermal decomposition method, ion exchange method and carbonylation method. The common principle of these methods is to convert the main metal elements by oxidation or reduction Selenium is converted into seleni...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/02
CPCC01B19/02
Inventor 杨斌查国正蒋文龙徐宝强刘大春孔祥峰罗欢黄大鑫郭新宇邓聚海陈秀敏李一夫郁青春杨红卫田阳邓勇王飞熊恒杨佳吴鉴
Owner KUNMING UNIV OF SCI & TECH