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Method for extracting selenium from material containing arsenic, selenium and aluminum

A material, crude selenium technology, applied in the direction of element selenium/tellurium, etc., can solve the problems affecting the safety of production personnel, environmental pollution, difficult to achieve separation and extraction effects, etc., to achieve the effect of no harm to the human body, good operating environment, and easy disposal

Active Publication Date: 2012-06-27
江西映泽环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because if adopt the method for extracting selenium by existing fire distillation or slagging by melting, because the boiling point difference of arsenic and selenium is little, so be difficult to reach separation and extraction effect; Produces highly toxic H 3 As gas causes environmental pollution and affects the safety of production personnel. How to adopt a safe and environmentally friendly separation technology and achieve the separation effect of selenium is the focus of current research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Accurately measure 1mol / l Na 2 Put 1000ml of S solution in a 1500ml beaker, heat to 35°C, and slowly add 140g of materials containing Se29.97%, As12.04%, Al47.63% at a solid-to-liquid ratio of 1:7 under fully stirred conditions, react for 20min, carefully Observe that the reaction solution begins to bubble, stop stirring, let it stand for 3min to filter, and filter the residue with 150ml 0.3mol Na 2 S was leached twice. Under the condition of full stirring, leached at room temperature for 20 minutes, filtered, combined the filtrates, and rinsed the filter residue with 150ml water for 4 times to obtain 88.36g of leached residue, the residue rate was 63.11%, and the Se content was 0.086%.

[0025] Put the filtrate in a 1500ml beaker, slowly add 10% H 2 o 2 About 125ml, until the red color of the reaction solution fades, check once every 5 minutes, if there is red color, add H 2 o 2 , until all the red color fades and remains unchanged for 5 minutes, stop stirring. S...

Embodiment 2

[0031] Measure 1mol Na 2 Add 800ml of S solution into a 1500ml beaker, heat to 30-40°C, slowly add 140g of materials containing Se31.40%, As12.48%, Al45.35% under the condition of full stirring, react for about 20min, the slurry starts to bubble , also stop stirring, filter while hot, filter residue with 0.3mol Na 2 S solution 500ml, carry out the second leaching at room temperature, filter for 10 minutes, the filtrate is combined in the first leaching solution, the filter residue is washed with 150ml of water for 3 times, the washing solution is combined in the leaching filtrate, and the leaching residue is 89.54g. It is 63.89%, containing Se0.078%.

[0032] All leaching and rinsing filtrates were collected in a 2000ml beaker, and after cooling to room temperature, 10% H 2 o 2 , until the red color of the reaction solution fades, react for 5 minutes, if the reaction solution is still red, add H 2 o 2 , until the red color fades and remains unchanged for 5 minutes, stop s...

Embodiment 3

[0035] Measure 1mol Na 2Add 800ml of S solution into a 1500ml beaker, heat to 30°C, slowly add 140g of materials containing Se34.12%, As11.83%, Al46.24% under the condition of full stirring according to the solid-to-liquid ratio of 1:5.7, and react for about 20 minutes. The slurry began to bubble, and the stirring and filtration was stopped, and the filter residue was washed with 0.3mol Na 2 S solution 300ml, under normal temperature conditions, carry out the second leaching for 10min and filter, the filtrate is combined in the first leaching solution, the filter residue is washed 3 times with 150ml of water, the washing solution is combined in the leaching and filtrating solution, and the filter residue is 89.02g, and the residue rate is 63.59%, containing Se0.076%.

[0036] All leaching and rinsing filtrates were collected in a 1500ml beaker, and after cooling to room temperature, 10% H 2 o 2 , until the red color of the reaction solution fades, react for 5 minutes, if th...

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Abstract

The invention provides a method for extracting selenium from a material containing arsenic, selenium and aluminum. The method comprises the following steps of: leaching selenium from the material containing arsenic, selenium and aluminum by using a Na2S solution; dropping 10% of H2O2 into a leaching liquor so as to precipitate the selenium; and washing precipitate to remove impurities so as to obtain coarse selenium with content of 98-99%. The method for extracting selenium from the material containing arsenic, selenium and aluminum, provided by the invention, has the advantages of simple method, low energy consumption, good operation environment, purity of the extracted coarse selenium of not less than 98%, total yield of the selenium of more than 98% and no secondary pollution caused tothe environment; the arsenic content in the product is not more than 0.1% and can be used for preparing selenium dioxide, selenium fertilizer or selenium contained drugs or can be purified again to obtain high-purity selenium; and the resources are comprehensively utilized.

Description

technical field [0001] The invention relates to the technical field of chemical separation and refining for extracting selenium from complex materials containing arsenic, aluminum and selenium. Background technique [0002] At present, in the published documents at home and abroad, there is only a method for extracting selenium from copper electrolysis anode slime, and there are also methods for extracting selenium from other smelting by-products and acid mud produced by sulfuric acid, but there is no public report on extracting selenium from As 11-15 %, Se 25-35%, Al 40-50% material to separate arsenic, aluminum and extract selenium. This is because if adopt the method for extracting selenium by existing fire distillation or slagging by melting, because the boiling point difference of arsenic and selenium is little, so be difficult to reach separation and extraction effect; Produces highly toxic H 3 As gas causes environmental pollution and affects the safety of productio...

Claims

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Application Information

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IPC IPC(8): C01B19/02
Inventor 伍代明赵铁光伍智敏
Owner 江西映泽环保科技有限公司
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