Preparation method and application of three-dimensional spherical scorodite crystal

A scorodite and spherical technology, which is applied in the field of preparation of three-dimensional spherical scorodite crystals, can solve the problem that the arsenic removal effect needs to be further improved, and achieve the effects of good application potential, efficient removal, and reduction of wastewater treatment costs.

Active Publication Date: 2018-08-28
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The preparation of existing scorodite is generally carried out at a pH of 2 to 4. When it is used to treat acidic arsenic-containing waste

Method used

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  • Preparation method and application of three-dimensional spherical scorodite crystal
  • Preparation method and application of three-dimensional spherical scorodite crystal
  • Preparation method and application of three-dimensional spherical scorodite crystal

Examples

Experimental program
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Example Embodiment

[0034] Example 1

[0035] This embodiment provides a method for preparing three-dimensional spherical scorodite crystals, including: weighing ferric nitrate and sodium arsenate solids, and using deionized water and concentrated nitric acid to prepare a mixed solution, the iron concentration and arsenic concentration are both 0.15 mol / L, the concentration of concentrated nitric acid is 0.12mol / L, and the pH of the mixed solution is 1.43. The mixed solution is placed in a 50mL autoclave and placed in an oven at 200°C for 12 hours to react. The reacted solution is natural After cooling to room temperature, it was separated by suction filtration, and the filter residue was washed with deionized water and dried at 60° C. to obtain a solid sample.

Example Embodiment

[0036] Example 2

[0037] This embodiment provides a method for preparing three-dimensional spherical scorodite crystals. The difference from Embodiment 1 is that the concentration of nitric acid added is 0.15 mol / L, and the pH of the mixed solution is 1.33.

Example Embodiment

[0038] Example 3

[0039] This embodiment provides a method for preparing three-dimensional spherical scorodite crystals. The difference from Embodiment 1 is that the concentration of nitric acid added is 0.18 mol / L, and the pH of the mixed solution is 1.20.

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Abstract

The invention provides a preparation method and an application of a three-dimensional spherical scorodite crystal. The preparation method comprises steps as follows: pH of a reaction system consistingof a trivalent iron source and a pentavalent arsenic source is regulated to 0.93-1.5, and a hydrothermal synthesis reaction is performed at 120-200 DEG C. The obtained three-dimensional spherical scorodite crystal has a micro morphology structure different from structure of conventional conical or pyramidal scorodite, the molecular formula and water content of the crystal are the same as those ofconventional scorodite, and the crystal has better environmental stability and is suitable for landfilling or stockpiling; arsenic and iron can be removed simultaneously and efficiently in a preparation process, so that the preparation method has quite good application potential when applied to treatment of arsenic-containing wastewater, furthermore, pH value in the preparation process is closerto acidity of acidic arsenic-containing wastewater in the actual situation, usage of a neutralizer is reduced, and wastewater treatment cost is reduced.

Description

technical field [0001] The invention relates to the fields of inorganic crystal synthesis and environmental water treatment, in particular to a preparation method and application of a three-dimensional spherical scorodite crystal. Background technique [0002] With the occurrence of arsenic pollution incidents in water bodies in recent years, arsenic as a highly toxic element that endangers human health has attracted widespread attention from all walks of life. Common arsenic removal methods include lime method, sulfuration method, lime iron salt method, etc. For industrial arsenic-containing wastewater, the treatment method with small slag production, stable waste slag, and simple operation is very advantageous. Therefore, the conversion of arsenic into arsenic-containing crystalline minerals has attracted increasing attention, among which scorodite (FeAsO 4 2H 2 O) is the most researched, and the content of arsenic in scorodite crystals is very high (32%), and scorodite...

Claims

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Application Information

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IPC IPC(8): C01G49/00C02F1/72C02F1/70
CPCC01G49/00C01P2002/72C01P2004/03C01P2004/32C02F1/705C02F1/72C02F2101/103C02F2101/203
Inventor 柴立元李青竹杨锦琴颜宇琛董琪宇王庆伟杨志辉闵小波梁彦杰刘恢
Owner CENT SOUTH UNIV
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