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Preparation method of polymerized iron flocculant

A flocculant and iron-poly technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of unstable precipitation, weakening, loss of coagulation performance, etc., and achieve enhanced bonding and bridging ability, improved coagulation effect, The effect of improving stability

Inactive Publication Date: 2012-12-05
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, one of the main reasons hindering the widespread use of polyferric flocculant is the unsatisfactory stability of its products
Under normal temperature and normal pressure, the traditional polyferric flocculants will become unstable and precipitate after being stored for a certain period of time, weakening or losing their coagulation performance

Method used

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  • Preparation method of polymerized iron flocculant
  • Preparation method of polymerized iron flocculant
  • Preparation method of polymerized iron flocculant

Examples

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Embodiment example

[0027] This implementation case uses the following steps:

[0028] (1) Control the temperature at 20-35°C, add 15.0g of ferrous sulfate and 1.2ml of sulfuric acid to 32.0ml of water, stir magnetically to completely dissolve the ferrous sulfate, and the reaction is exothermic;

[0029] (2) Control the temperature range constant, add 3.0ml hydrogen peroxide (30%) to the ferrous sulfate solution at a speed of 1.0ml / min, stir for 15min, so that the ferrous ions in the solution are completely oxidized to ferric ions;

[0030] (3) Add 32.1ml of 1mol / L sodium bicarbonate solution from the bottom of the beaker at a rate of 1.7ml / min, and then mature at a constant temperature of 50°C for 24h to obtain common polyferric sulfate.

Embodiment 2

[0032] The method described in this implementation case is basically the same as Case 1, the difference is that 3.5ml of sodium acetate solution of 5.0mol / L is added in step (3), the concentration of iron in the polyferric sulfate is kept constant, and the reaction obtains modified polyferric sulfate 1 .

Embodiment 3

[0034] The method described in this implementation case is basically the same as Case 1, the difference is that 10.5ml of sodium acetate solution of 5.0mol / L is added in step (3), the concentration of iron in the polyferric sulfate is kept constant, and the reaction obtains modified polyferric sulfate 2 .

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Abstract

The invention relates to a preparation method of a polymerized iron flocculant, which comprises the steps of: mixing a certain amount of ferrous salt (or ferric salt), inorganic acid and water under stirring condition to completely dissolve iron salt; adding a certain amount of oxidant and sufficiently stirring to completely oxidize ferrous ion into ferric ion; and adding a certain amount of inorganic base and polymerization inhibitor to partially hydrolyze and polymerize ferric ion, and then aging at normal temperature for some time to obtain modified polymerized iron flocculant. Compared with the prior art, the prepared modified polymerized iron flocculant has the advantages that the stability is improved, the bonding bridging capability is enhanced, alum flower is rapid in forming and large, the coagulation effect is improved and the like; and when the modified poly iron flocculant is used under certain conditions, the water outflow quality is not significantly influenced under the condition that the flocculation effect is significantly improved.

Description

technical field [0001] The invention belongs to the technical field of flocculant preparation, and in particular relates to a preparation method of polyiron flocculant. Background technique [0002] The shortage of water resources has become the bottleneck of sustainable social development, and improving water treatment capacity and efficiency has become an important way to alleviate the shortage of water resources. At present, in sewage treatment, the use of polymer flocculants for coagulation and sedimentation is an important operation for removing colloidal suspended solids and organic matter in water. Commonly used polymer flocculants mainly include organic polymer flocculants and inorganic polymer flocculants. Among the organic polymer flocculants, although the natural polymer flocculants have the advantages of being renewable, non-toxic, and biodegradable, their stability is not high, while the synthetic organic polymer flocculants are limited due to the toxicity of r...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 曹江林刘维高乃云金放鸣芦曼田颖钟恒
Owner TONGJI UNIV
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