Preparation method of polyferric sulfate

A technology for polymerizing ferric sulfate and ferrous sulfate, which is applied in the fields of ferric sulfate, flocculation/sedimentation water/sewage treatment, etc., which can solve the problems of product performance failing to meet the requirements of first-class products, increased dosage of hydrogen peroxide, and production costs Increase and other issues, to achieve the effect of promoting conversion rate, reducing dosage, and reducing cost input

Active Publication Date: 2015-06-10
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] What the present invention solves is the process of preparing polyferric sulfate by hydrogen peroxide oxidation method in the prior art. Because hydrogen peroxide is easy to decompose, its oxidation efficiency is reduced, so that the dosage of hydrogen peroxide increases, resulting in an increase in production cost. 1. The performance of the product cannot meet the requirements of the first-class product, and then provide a method for preparing polyferric sulfate that can effectively avoid the decomposition of hydrogen peroxide, improve the oxidation capacity of hydrogen peroxide, and is low in cost and suitable for industrial production.

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  • Preparation method of polyferric sulfate

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Embodiment 1

[0035] The preparation method of the polyferric sulfate described in the present embodiment, comprises the steps:

[0036] (1) get the sulfuric acid aqueous solution that sulfuric acid content is 60wt% to 2.75Kg, ferrous sulfate heptahydrate content is that the industrial grade ferrous sulfate heptahydrate solid of 91wt% carries out acidification treatment, and stirring makes it acidify evenly until obtaining pH=1 Mixed solution, the mass concentration of ferrous ions in the mixed solution is 250g / L;

[0037] (2) Under normal temperature and pressure, the mixed solution and the hydrogen peroxide with a hydrogen peroxide content of 25wt% are realized to flow separately through separate flow channels, after the mixed solution and the hydrogen peroxide flow out from the respective flow channels , the two are in contact with each other and react at a height of 4 / 5 of the total height of the reactor from the bottom of the reactor; wherein, the flow rate of the mixed liquid is contr...

Embodiment 2

[0040] The preparation method of the polyferric sulfate described in the present embodiment, comprises the steps:

[0041] (1) getting sulfuric acid content is that the sulfuric acid aqueous solution of 65wt% carries out acidification treatment to the ferrous sulfate solid of 2.75Kg, obtains the mixed solution of pH=0.5, and the mass concentration of ferrous ion is 200g / L in the described mixed solution;

[0042] (2) Under normal temperature and pressure, the mixed solution and the hydrogen peroxide with a hydrogen peroxide content of 50 wt% are realized to flow separately through separate flow channels, after the mixed solution and the hydrogen peroxide flow out from the respective flow channels , the two are in contact with each other and react at a height of 7 / 10 of the total height of the reactor from the bottom of the reactor; wherein, the flow rate of the mixed liquid is controlled to be 70mL / min, and the flow rate of the hydrogen peroxide is 10mL / min min, so that the mo...

Embodiment 3

[0045] The preparation method of the polyferric sulfate described in the present embodiment, comprises the steps:

[0046] (1) getting the sulfuric acid aqueous solution that sulfuric acid content is 70wt% carries out acidification treatment to the waste ferrous sulfate solid 2.75Kg that produces in the titanium dioxide production process, obtains the mixed solution of pH=1, the quality of ferrous ion in the described mixed solution Concentration is 220g / L, contains the ferrous sulfate of 90wt% in the described waste ferrous sulfate solid;

[0047] (2) At normal temperature and pressure, the mixed solution and the hydrogen peroxide with a hydrogen peroxide content of 37.5wt% are realized to flow separately through separate flow channels, when the mixed solution and the hydrogen peroxide flow out from the respective flow channels Afterwards, the height of the two from the bottom of the reactor is 2 / 3 of the total height of the reactor and reacts; wherein, the flow rate of the m...

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Abstract

The invention provides a preparation method of polyferric sulfate. The method is that a sulfuric acid aqueous solution and ferrous sulfate are mixed to obtain a mixing solution of which the pH is 0.5 to 1.5; the mixing solution and hydrogen peroxide respectively individually flow through independent flowing channels and then are synchronously poured into a reaction system to react to obtain polyferric sulfate. With the adoption of the method, the oxidizing capacity of hydrogen peroxide can be improved, the rate of converting ferrous ions into ferric ions can be increased, and moreover, ferrous ions and hydrogen peroxide can fully contact and rapidly react; therefore, the problem of decomposing of hydrogen peroxide at a high temperature or strong acid condition in the prior art can be effectively solved, the dosage of hydrogen peroxide can be reduced, the cost input can be decreased, the operation process is simplified, and the reaction time is greatly reduced. The quality of polyferric sulfate prepared by the method meets indicators as specified by national standard on top quality goods; with the adoption of the polyferric sulfate to treat wastewater, the COD of drained water can be stabilized to be less than or equal to 86mg/L, so that the method is applicable to industrial production.

Description

technical field [0001] The invention relates to a preparation method of polyferric sulfate, which belongs to the technical field of water purifiers. technical background [0002] Polyferric sulfate is a new type of high-efficiency inorganic polymer flocculant developed in the 1980s. Its liquid is reddish-brown viscous, and its solid is light yellow amorphous powder. It is easily soluble in water and can be configured into any concentration. The solution. Compared with traditional flocculants such as ferric chloride, aluminum sulfate, ferric chloride sulfate, basic aluminum chloride, etc., polyferric sulfate has the advantages of low production cost, less dosage in the purification process, and a wide range of pH values ​​for water bodies , Impurities (COD, heavy metals, suspended solids, etc.) high removal rate, low residue concentration, large alum flower particles, fast settling speed, good decolorization effect, etc., widely used in drinking water, industrial water, urba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/14C02F1/52
Inventor 樊俐王立贤
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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