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Preparation method of hydroxyl arsenic ferrous phosphate solid solution and application of method

A hydroxyarsenic ferrous phosphate, ferrous phosphate technology, applied in chemical instruments and methods, water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of poor stability of arsenic compounds and environmental pollution, and achieve stable Good properties, long-term storage stability, and high crystallinity

Active Publication Date: 2016-11-16
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of preparation method of hydroxy arsenic ferrous phosphate solid solution, respectively take ferrous sulfate heptahydrate, phosphoric acid and sodium arsenate as Fe source, P source and As source, by dissolving the pentavalent Arsenic is converted into an insoluble precipitation compound with low water solubility, high crystallinity and good stability—hydroxyarsenic ferrous phosphate solid solution, and the insoluble precipitation compound also has the advantages of low arsenic leaching concentration to solve the problem caused by the poor stability of arsenic compounds Environmental pollution problem; Described method specifically comprises the following steps:

Method used

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  • Preparation method of hydroxyl arsenic ferrous phosphate solid solution and application of method
  • Preparation method of hydroxyl arsenic ferrous phosphate solid solution and application of method
  • Preparation method of hydroxyl arsenic ferrous phosphate solid solution and application of method

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Embodiment 1

[0023] Under the condition of stirring at room temperature, add 2.54 g of sodium arsenate solid into a beaker containing 50 mL of deionized water to prepare an arsenic solution (the molar concentration of sodium arsenate is 0.120 mol L -1 ); while stirring at room temperature, add 5.60 g of ferrous sulfate heptahydrate to a beaker containing 100 mL of deionized water (the molar concentration of ferrous sulfate is 0.201 mol L -1 ) and 7.95g phosphoric acid solution (the mass fraction of phosphoric acid is 85%, the molar concentration of phosphoric acid is 0.690mol L -1 ), to prepare the ferrous hydroxyphosphate precursor solution; add the arsenic solution dropwise to the ferrous hydroxyphosphate precursor solution while stirring, and use 1.00mol / L NaOH to adjust the initial pH value of the reaction system during the mixing process, so that the reaction system The initial pH value is maintained in the range of 7.90 to 8.10. After fully stirring for 30 minutes, pour it into a hyd...

Embodiment 2

[0025] Under the condition of stirring at room temperature, add 4.17 g of sodium arsenate solid into a beaker containing 50 mL of deionized water to prepare an arsenic solution (the molar concentration of sodium arsenate is 0.197 mol L -1 ); while stirring at room temperature, simultaneously add 0.25 g of ferrous sulfate heptahydrate to a beaker containing 100 mL of deionized water (the molar concentration of ferrous sulfate is 0.009 mol L -1 ) and 3.13g phosphoric acid (the mass fraction of phosphoric acid is 85%, and the molar concentration of phosphoric acid is 0.271mol L -1 ), to prepare the ferrous phosphate precursor solution; add the arsenic solution dropwise to the ferrous phosphate precursor solution while stirring, and use 1.00mol / L NaOH to adjust the initial pH value of the reaction system during the mixing process, so that the initial pH value of the reaction system The value is maintained in the range of 7.90 to 8.10. After fully stirring for 60 minutes, pour it i...

Embodiment 3

[0027] Under the condition of stirring at room temperature, add 4.17 g of sodium arsenate solid into a beaker containing 50 mL of deionized water to prepare an arsenic solution (the molar concentration of sodium arsenate is 0.197 mol L -1 ); while stirring at room temperature, add 2.12 g of ferrous sulfate heptahydrate to a beaker containing 100 mL of deionized water (the molar concentration of ferrous sulfate is 0.076 mol L -1 ) and 0.52g phosphoric acid (the mass fraction of phosphoric acid is 85%, and the molar concentration of phosphoric acid is 0.045mol L -1), to prepare the ferrous phosphate precursor solution; add the arsenic solution dropwise to the ferrous phosphate precursor solution while stirring, and use 1.00mol / L NaOH to adjust the initial pH value of the reaction system during the mixing process, so that the initial pH value of the reaction system The value is maintained in the range of 7.90 to 8.10. After fully stirring for 100 minutes, pour it into a hydrother...

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Abstract

The invention discloses a preparation method of a hydroxyl arsenic ferrous phosphate solid solution and application of the method, and belongs to the technical field of environment protection. According to the method, iron sulfate heptahydrate, phosphoric acid and sodium arsenate or arsenic-containing waste water are respectively used as Fe sources, P sources and As sources; the reaction is performed for 6 to 72h at 100 to 200 DEG C; the hydroxyl arsenic ferrous phosphate solid solution with high crystallinity degree and high stability can be obtained through hydrothermal synthesis. The method is mainly used for converting pentavalent arsenic in a dissolved state in water into insoluble arsenic-containing precipitate compounds, so that the problem of environment pollution due to poor stability of the arsenic compounds can be solved. Compared with the prior art, the method has the advantages that the obtained arsenic-containing precipitate compounds have good long-time stability; the piling and the storage are safe and reliable; the secondary pollution of the arsenic is avoided.

Description

technical field [0001] The invention relates to a preparation method of a hydroxyarsenate ferrous phosphate solid solution and an application of the method, belonging to the technical field of environmental protection. Background technique [0002] Arsenic is a sulfur-friendly metalloid or semi-metallic element. Arsenic mostly occurs in non-ferrous metal deposits in nature, and is mixed in gold, copper, lead, zinc, tin, nickel, cobalt and other non-ferrous metal minerals in the form of sulfide. As non-ferrous metal deposits are gradually enriched in mining, dressing, and smelting, they are dispersed in waste water, waste residue, and flue gas in different forms, causing arsenic damage; in addition, the use and disposal of arsenic-containing pesticides and wood preservatives will also cause arsenic compounds. diffusion. Arsenic and its compounds are extremely toxic and have mutagenic, carcinogenic and teratogenic effects on the human body and other organisms. If these arsen...

Claims

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Application Information

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IPC IPC(8): C02F1/52
CPCC02F1/5245
Inventor 周新涛张明琴罗中秋荆磊磊吴易梅何欢史桂杰
Owner KUNMING UNIV OF SCI & TECH
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