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Preparation method for solid polymer ferric sulfate zinc flocculant

A solid polymerization and flocculant technology, which is applied in the fields of ferric sulfate, flocculation/precipitation water/sewage treatment, etc., can solve the problems of limiting the promotion and application of iron-based flocculants, unstable transportation of liquid flocculants, poor stability of liquid flocculants, etc. problems, to achieve the effect of low production cost, low residual turbidity and stable flocculation performance

Active Publication Date: 2015-06-10
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aluminum-based flocculants have potential toxicity and secondary pollution problems, and present disadvantages such as small flocculation volume, looseness, and slow settlement, which in turn lead to the development of iron-based flocculants. The research and development of iron-based flocculants with high efficiency has become an important Research Hotspots
During the application of iron-based flocculants, problems such as relatively poor stability of liquid flocculants and inconvenient transportation were found, which limited the promotion and application of iron-based flocculants
[0004] The preparation of solid flocculants can solve the problems of instability and inconvenient transportation of liquid flocculants, and promote the popularization and application of iron-based flocculants
The preparation of solid iron silicate-based flocculants currently used in the market is relatively complicated due to the instability of silicic acid-based materials; other solid flocculants are mostly obtained by spray-drying liquid products or adding other additives. Agents such as diatomaceous earth, clay and sodium bentonite increase energy consumption and potentially reduce flocculation of active ingredients

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of a solid polymeric iron-zinc sulfate flocculant. Under normal temperature conditions, 3 ml of 98% concentrated sulfuric acid is mixed with 54.3 g of ferrous sulfate heptahydrate, an industrial by-product of titanium dioxide, and the mixture is stirred at a medium speed until a uniform paste is formed ; Then slowly add 10.85 ml of sodium chlorate (concentration 3M) ​​dropwise and stir at a slow speed to fully oxidize; after the reaction phase is stirred evenly, add solid powdered zinc sulfate according to the Fe / Zn molar ratio of 2:1, and stir slowly to make it completely Dissolve; add 10 ml of carbon oxide material solution with a concentration of 16 mg / L; heat in a water bath for hydrolysis polymerization, and stir at a medium speed, the temperature of the water bath is 60 °C, and the heating time is 40 min; Sodium solid powder, and make sure to stir at a medium speed until the liquid bubbles completely disappear to obtain the primary product of t...

Embodiment 2

[0026] A preparation method of solid polymeric iron zinc sulfate flocculant, under normal temperature, 5.3 ml of 98% concentrated sulfuric acid and 54.3 g of ferrous sulfate heptahydrate, an industrial by-product of titanium dioxide, are mixed, and the mixture is stirred at a medium speed until a uniform paste is formed ; Then slowly add 10.85 ml of sodium chlorate (concentration 3M) ​​dropwise and stir at a slow speed for full oxidation reaction; after the reaction phase is stirred evenly, add solid powder zinc sulfate according to the Fe / Zn molar ratio of 8:1, and stir slowly to make it completely Dissolve; add 15ml of carbon oxide material solution with a concentration of 16 mg / L; heat in a water bath for hydrolysis polymerization, and stir at a medium speed, the temperature of the water bath is 30 °C, and the heating time is 50 min; during the process of the water bath, slowly add 2.69 g of sodium carbonate Solid powder, and make sure to stir at a medium speed until the liq...

Embodiment 3

[0028] A preparation method of a solid polymeric ferric zinc sulfate flocculant. Under normal temperature conditions, 4.5ml of 98% concentrated sulfuric acid is mixed with 54.3g of ferrous sulfate heptahydrate, an industrial by-product of titanium dioxide, and the mixture is stirred at a medium speed until a uniform paste is formed. ; Then slowly add 10.85 ml of sodium chlorate (concentration 3M) ​​dropwise and stir at a slow speed for full oxidation reaction; after the reaction phase is stirred evenly, add solid powdered zinc sulfate according to the Fe / Zn molar ratio of 6:1, and stir slowly to make it completely Dissolve; add 18 ml of carbon oxide material solution with a concentration of 16 mg / L; heat in a water bath for hydrolysis polymerization, and stir at a medium speed, the temperature of the water bath is 60 °C, and the heating time is 40 min; Sodium solid powder, and make sure to stir at a medium speed until the liquid bubbles completely disappear to obtain the primar...

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Abstract

The invention relates to a preparation method for solid polymer ferric sulfate zinc flocculant. The preparation method comprises the steps that firstly, solid seven-hydrate ferrous sulfate is acidized through concentrated sulfuric acid; secondly, sodium chlorate is added into the mixture and stirred slowly so that tan uniform liquid can be formed; thirdly, solid zinc sulfate is added into the liquid and mixed with the liquid to be uniform, and solid powdery zinc sulfate is added again and stirred slowly to be completely dissolved; afterwards, carbon oxidation materials are added so that the curing rate of the flocculant can be increased, and water bath heating is performed; finally, dry heating and room-temperature curing are performed through an electric jacket, so the faint yellow solid polymer ferric sulfate zinc flocculant can be obtained in a short time. According to the preparation method, none of waste liquid, waste residue and waste gas are produced in the production process; the curing rate of the product is high, mass distribution is uniform, the content of flocculation active components is high, and the flocculation effect is good, and therefore the preparation method can be applied to treatment for industrial waste water, domestic sewage, source water and the like.

Description

technical field [0001] The invention relates to the technical field of water treatment water purifiers, in particular to a preparation method of a solid polymerized ferric zinc sulfate flocculant. Background technique [0002] Flocculation is an important pretreatment technology in the unit operation of water treatment process, and plays an important role in the removal of colloidal particles. Flocculation mainly depends on the addition of certain chemical substances with flocculation characteristics, and has multiple functions such as electrical neutralization, adsorption bridging, and net capture and sweeping. The currently widely used chemical substances mainly include organic polymer flocculants and inorganic polymer flocculants. Inorganic polymer flocculants mainly include iron-based and aluminum-based, of which polyaluminum chloride and polyferric sulfate are typical representatives. They have different flocculation characteristics in water treatment applications. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C01G49/14
Inventor 朱国成王茜柳俊斐马宏璞任伯帜张鹏李学美
Owner HUNAN UNIV OF SCI & TECH
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