A kind of polymeric ferric acetate and its preparation method and application

A technology of iron acetate and glacial acetic acid, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sludge/sewage treatment, etc., can solve concrete structure corrosion, steel structure corrosion, chloride ion pollution, etc. problems, to achieve the effect of improved flocculation performance, low production cost, and neutralization of strong electricity

Active Publication Date: 2020-07-10
HEFEI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since polyferric sulfate and polyferric chloride contain sulfate ions and chloride ions, different problems also arise in the process of use, such as chloride ions will cause pollution, etc., which will not only corrode the steel structure, And it also corrodes the concrete structure; sulfate ions can also corrode other materials

Method used

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  • A kind of polymeric ferric acetate and its preparation method and application
  • A kind of polymeric ferric acetate and its preparation method and application
  • A kind of polymeric ferric acetate and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] At room temperature (15-25°C), dissolve ferrous sulfate or ferrous sulfate heptahydrate in water to obtain a ferrous sulfate solution, in which the concentration of ferrous ions is 1.80mol / L; add glacial acetic acid and potassium chlorate in sequence during continuous stirring Mix evenly to obtain a mixed solution, in which the molar ratio of ferrous ions to acetic acid is 1:4.0, and the molar ratio of ferric ions to potassium chlorate is 5.6:1; then placed in a constant temperature water bath at 60°C for 6 hours to remove impurity ions to obtain The reddish-brown liquid product is polymerized ferric acetate.

[0026] The liquid product obtained in Example 1 was dried at 50° C., and the morphology characteristics of the obtained sample were analyzed using a model SU1510 scanning electron microscope (SEM) and a Shimadzu Nicolet-380 Fourier transform infrared spectrometer.

[0027] figure 1 It is the SEM photo of the polymerized iron acetate obtained in Example 1. It can...

Embodiment 2

[0031] At room temperature (15-25°C), dissolve ferrous sulfate or ferrous sulfate heptahydrate in water to obtain a ferrous sulfate solution, in which the concentration of ferrous ions is 1.90mol / L; add glacial acetic acid and potassium chlorate in sequence during continuous stirring Mix evenly to obtain a mixed solution, in which the molar ratio of ferrous ions to acetic acid is 1:4.0, and the molar ratio of ferric ions to potassium chlorate is 5.5:1; then placed in a constant temperature water bath at 50°C for 6 hours to remove impurity ions to obtain The reddish-brown liquid product is polymerized ferric acetate.

[0032] The above-mentioned polymerized ferric acetate is used to treat wastewater with a phosphorus concentration of 6mg / L, the pH of the wastewater is 7.76, the amount of flocculant is 24mg / L, and it is stirred rapidly at 250r / min for 2min, and then stirred at a slow speed of 60r / min for 15min. Settled for 20min. Its turbidity removal rate is 96.6%, and phospho...

Embodiment 3

[0034] At room temperature (15-25°C), dissolve ferrous sulfate or ferrous sulfate heptahydrate in water to obtain a ferrous sulfate solution, in which the concentration of ferrous ions is 1.85mol / L; add glacial acetic acid and potassium chlorate in sequence during continuous stirring Mix evenly to obtain a mixed solution, in which the molar ratio of ferrous ions to acetic acid is 1:4.0, and the molar ratio of ferric ions to potassium chlorate is 5.55:1; then placed in a constant temperature water bath at 70°C for 6 hours to remove impurity ions to obtain The reddish-brown liquid product is polymerized ferric acetate.

[0035] The above-mentioned polymerized ferric acetate is used to treat wastewater with a phosphorus concentration of 6mg / L, the pH of the wastewater is 7.76, the amount of flocculant is 24mg / L, and it is stirred rapidly at 250r / min for 2min, and then stirred at a slow speed of 60r / min for 15min. Settled for 20min. Its turbidity removal rate is 96%, and phosphor...

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Abstract

The invention discloses a preparation method of polyferric acetate, comprising the following steps: dissolving ferrous sulfate or ferrous sulfate heptahydrate in water at room temperature to obtain a ferrous sulfate solution, successively adding glacial acetic acid and an oxidizing agent and uniformly mixing to obtain a mixed solution, carrying out water bath treatment, removing foreign ions to obtain a reddish brown liquid product, and drying to obtain solid polyferric acetate. The invention also discloses polyferric acetate. The invention also discloses application of the polyferric acetate. By replacing sulfuric acid and hydrochloric acid with acetic acid for preparation of a flocculant of polymeric iron, the corrosion caused by countra-ion acetate ion in polymeric iron is less than corrosion caused by sulfate ion and chloride ion. In addition, dephosphorization rate and removal rate of turbidity during treatment of phosphorus wastewater are both high. The removal rate of turbidity can reach 95% and above, and the dephosphorization rate can reach 93% and above.

Description

technical field [0001] The invention relates to the technical field of water treatment agents, in particular to a polymerized ferric acetate and its preparation method and application. Background technique [0002] Due to the rapid development of urbanization, industrialization and agriculturalization, a large amount of phosphorus-containing substances are discharged into water bodies. Although phosphorus is beneficial to the ecosystem, excessive phosphorus-containing compounds in fresh water are absorbed by algae and plants, causing algae and plants to grow wildly, destroying the balance of organic matter in the water body, deteriorating water quality and causing environmental pollution and water pollution. Eutrophication phenomenon. In order to prevent the eutrophication of water bodies, many countries have strict regulations on the limitation of phosphorus content discharged into water bodies. Therefore, there have been many studies on phosphorus removal in recent decade...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52
CPCC02F1/5236
Inventor 卫艳新许俊翠丁爱民董雄辎陆金朋
Owner HEFEI NORMAL UNIV
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