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Method for fixing arsenic by preparing ferric arsenate/goethite material of core-shell structure by means of arsenic-containing solution

A core-shell structure, iron arsenate technology, applied in the field of environmental treatment, can solve the problems of poor arsenic fixation effect and high cost of arsenic fixation, and achieves the effects of simple steps, low price, and favorable popularization and application.

Active Publication Date: 2016-11-09
湖南知远环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the defects of high arsenic fixation cost and poor arsenic fixation effect in the existing arsenic fixation technology, the purpose of the present invention is to provide a low-cost and high-efficiency arsenic fixation method, which can pass arsenic in arsenic-containing solution through simple, Low-cost process to make ferric arsenate / goethite materials with particularly good stability and core-shell structure to achieve permanent fixation of arsenic

Method used

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  • Method for fixing arsenic by preparing ferric arsenate/goethite material of core-shell structure by means of arsenic-containing solution
  • Method for fixing arsenic by preparing ferric arsenate/goethite material of core-shell structure by means of arsenic-containing solution
  • Method for fixing arsenic by preparing ferric arsenate/goethite material of core-shell structure by means of arsenic-containing solution

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Prepare 1 liter of 30 g / L arsenic-containing solution according to the above method, and adjust the pH of the solution to 1 with concentrated sulfuric acid. Weigh 166.83 grams of ferrous sulfate heptahydrate according to the molar ratio of iron to arsenic of 1.5, add it into the solution and keep the solution stirring. Oxygen was bubbled into the solution at a flow rate of 0.5 L / min. The solution was heated to 90 degrees Celsius, kept stirring and reacting with oxygen for 7 hours. After the solution was cooled, it was filtered, the precipitate was washed with deionized water, and dried to obtain a light green powder solid. And the arsenic content in the solution after the reaction was tested by direct reading plasma spectrometer (ICP), and the arsenic deposition rate was calculated to be 99.6%. Soak the obtained solid powder in a sodium hydroxide solution with a pH of 11 for 12 hours, filter, wash, and dry to obtain a khaki powder, which is the target product. Finall...

Embodiment 2

[0028] Prepare 1 liter of 10 g / L arsenic-containing solution according to the above method, and adjust the pH of the solution to 1 with concentrated sulfuric acid. Weigh 74.15 grams of ferrous sulfate heptahydrate according to the molar ratio of iron to arsenic of 2, add it into the solution and keep the solution stirring. Oxygen was bubbled through the solution at a flow rate of 2 liters / minute. The solution was heated to 80 degrees Celsius, kept stirring and reacted with oxygen for 9 hours. After the solution was cooled, it was filtered, the precipitate was washed with deionized water, and dried to obtain a light green powder solid. And the arsenic content in the solution after the reaction was tested by direct reading plasma spectrometer (ICP), and the arsenic deposition rate was calculated to be 99.4%. Soak the obtained solid powder in a sodium hydroxide solution with a pH of 13 for 6 hours, filter, wash, and dry to obtain a light red powder, which is the target product....

Embodiment 3

[0030] Prepare 1 liter of 50 g / L arsenic-containing solution according to the above method, and adjust the pH of the solution to 2 with concentrated sulfuric acid. Weigh 397.62 grams of ferrous chloride tetrahydrate according to the molar ratio of iron to arsenic of 3, add it into the solution and keep the solution stirring. Air was bubbled through the solution at a flow rate of 5 liters / minute. The solution was heated to 70 degrees Celsius, kept stirring and reacting with oxygen for 12 hours. After the solution was cooled, it was filtered, the precipitate was washed with deionized water, and dried to obtain a light green powder solid. And the arsenic content in the solution after the reaction was tested by direct reading plasma spectrometer (ICP), and the arsenic deposition rate was calculated to be 99.5%. Soak the obtained solid powder in a sodium hydroxide solution with a pH of 14 for 2 hours, filter, wash, and dry to obtain a red powder, which is the target product.

[...

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Abstract

The invention discloses a method for fixing arsenic by preparing a ferric arsenate / goethite material of a core-shell structure by means of an arsenic-containing solution. The method comprises the steps that after the pH value of the arsenic-containing solution is adjusted to be acidic, ferrite is added into the arsenic-containing solution, oxygen-containing gas is led into the arsenic-containing solution, a reaction occurs on the heating condition when the solution is stirred, and ferric arsenate sediment is obtained; and the ferric arsenate sediment is immersed into an alkaline solution for reacting, and then the ferric arsenate / goethite material of the core-shell structure is obtained. According to the method, the ferric arsenate / goethite material of the core-shell structure and with quite good stability can be prepared from arsenic in the arsenic-containing solution by means of a simple and low-cost process, and permanent fixing of the arsenic is achieved.

Description

technical field [0001] The present invention specifically relates to a method for preparing an arsenic-containing core-shell structure material; in particular, it relates to a method for using arsenic-containing waste liquid or arsenic-containing leaching liquid to prepare iron arsenate / goethite materials with a core-shell structure to achieve arsenic fixation, which belongs to the environmental governance area, Background technique [0002] Arsenic is a toxic element that exists stably in rock formations and soils mainly in the form of low-toxic calcium, iron, manganese, aluminum and other insoluble arsenates, and sulfides such as realgar, orpiment and arsenopyrite in the earth's crust. In the process of human development and utilization of mineral resources, the natural stable form of arsenic is destroyed and highly toxic water-soluble arsenic is released, especially the high-concentration arsenic-containing wastewater produced in the non-ferrous metal smelting process has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/33A62D101/43
CPCA62D3/33A62D2101/43
Inventor 唐新村汪洋
Owner 湖南知远环保科技有限公司
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