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Vacuum refining and purifying method for coarse selenium material

A vacuum refining and material technology, applied in binary selenium/tellurium compounds, elemental selenium/tellurium, etc., can solve the problems of low output of a single equipment, long purification process, poor on-site operating environment, etc., to reduce product pollution, Good working environment and the effect of reducing energy consumption

Active Publication Date: 2017-07-14
KUNMING DIBOO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The present invention provides a method for vacuum refining and purifying crude selenium materials, aiming at the problems of long purification process flow of crude selenium materials, poor on-site operating environment, low output of a single device, and low-grade selenium products produced.

Method used

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  • Vacuum refining and purifying method for coarse selenium material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step 1. Process the crude selenium materials produced in the process of recovering gold and silver by 300Kg copper electrolytic anode mud (main components: 92.35% of selenium, 0.01% of tellurium, 0.73% of lead, 0.29% of water, and others are copper, iron and other salts. Class) Put it into a closed melting electric furnace at one time, and heat the electric furnace to 230℃ to melt the crude selenium material. After the crude selenium material in the electric furnace is completely melted, the electric furnace is heated to 260°C for degassing. In the degassing process, the melting electric furnace is vacuumed with a circulating pump, and the vacuum of the melting electric furnace is maintained at 500~4000Pa. The selenium melt is stirred and stirred for 2 hours to obtain a density of 4.2g / cm 3 Of crude selenium melt.

[0040] Step 2. Put the melted and degassed crude selenium melt into a graphite crucible, place the graphite crucible in a vacuum distillation furnace, and vacu...

Embodiment 2

[0043] Step 1. Treat 500Kg copper electrolytic anode slime to the crude selenium material produced during the sulfation roasting process (the main components are: selenium 82.7%, tellurium 0.87%, lead 1.18%, water 28.53%, and the others are copper, iron and other salts. ) Stably add it to a closed melting electric furnace at a rate of 14g / s, slowly raise the temperature of the electric furnace to 300°C to melt the crude selenium material. When melting, use a vacuum pump to vacuum the melting electric furnace while continuously stirring the crude selenium material. After the 500Kg crude selenium material in the airtight melting electric furnace is completely melted, the electric furnace is heated to 350℃ for degassing. During the degassing process, the melting electric furnace is vacuumed with a vacuum pump, and the vacuum of the melting electric furnace is controlled to 1000~5000Pa. While stirring the selenium melt, stirring for 1 hour to obtain a density of 4.5g / cm 3 Of crude s...

Embodiment 3

[0048] Step 1. The crude selenium materials produced in the process of recovering gold and silver by treating 650Kg copper electrolytic anode mud (the main components are: selenium 76.04%, tellurium 5.08%, lead 8.78%, water 28.12%, and others are copper, iron and other salts) Class) Add 30Kg of materials to the closed melting electric furnace at a rate of one-time addition of 30Kg materials every 20 minutes. After the initial feeding, the furnace is heated to 350°C to melt the crude selenium materials while continuously stirring the crude selenium materials. After all 650Kg crude selenium materials are put into the closed melting electric furnace, and the materials are completely melted, the electric furnace is heated to 400°C for degassing. During the degassing process, the melting electric furnace is vacuumed with a vacuum pump, and the vacuum degree of the melting electric furnace is controlled to 2000~10000Pa At the same time, the selenium melt is stirred, and the density is...

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Abstract

The invention relates to a vacuum refining and purifying method for a coarse selenium material and belongs to the field of metallurgy technological engineering. The method is characterized in that a fine selenium product is obtained from the coarse selenium material through procedures of smelting, degassing and vacuum distillation. The method specifically comprises the following steps: S1, adding the coarse selenium material into a closed container to be smelted at 230-350 DEG C; after the material is fully smelted, raising the temperature to 250-400 DEG C to degas, vacuumizing the closed container during degassing, and stirring the selenium melt at the same time to obtain a coarse selenium melt, the density of which is greater than 4g / cm<3>; and S2, putting the coarse selenium melt obtained in the S1 into a vacuum furnace, and distilling the coarse selenium melt for 3-4 hours to output a fine selenium product, wherein the vacuum degree is 1-20Pa and the temperature is 500-1000 DEG C. The method provided by the invention is short in process flow, and 99.9% of fine selenium can be output from the coarse selenium material through procedures of smelting, degassing and vacuum distillation.

Description

Technical field [0001] The invention relates to the field of metallurgical technology engineering, in particular to a method for vacuum refining and purifying crude selenium materials. Background technique [0002] Selenium is an important semiconductor material with a melting point of 221°C and a boiling point of 685°C. The abundance of selenium in the crust is only 0.05~0.09mg / kg. No single selenium deposit with economic value has been found in nature. Selenium is usually associated with copper, lead, nickel and other metal sulfide deposits. The main source of selenium is the by-product produced during the smelting of heavy metal sulfide ore. The selenium production from copper electrolysis anode slime and copper sulfide ore smelting dust accounts for about 90% of the total selenium output, and the rest comes from the refining output of lead, cobalt and nickel. The calcine, acid mud produced by sulfuric acid and washing mud produced by pulping are recovered. [0003] At present...

Claims

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Application Information

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IPC IPC(8): C01B19/02C01B19/04
Inventor 戴卫平速斌陈巍汤文通潘建仁杨斌李红陈浩杨堃余勇朱坤红杨寿云
Owner KUNMING DIBOO TECH
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