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A kind of preparation method of polysilicate iron polymer flocculant

A technology of polymer flocculant and polysilicate iron, which is applied in flocculation/sedimentation water/sewage treatment, process wastewater treatment, textile industry wastewater treatment, etc. It can solve the problems of affecting storage time, difficulty in large-scale promotion, high water salinity, etc. problem, to achieve the effect of prolonging storage time, improving processing quality and improving stability

Active Publication Date: 2017-08-18
山东龙港硅业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the preparation of existing polysilicate iron is limited to laboratory experiments and has not been applied to large-scale production. The main reason is that the degree of polymerization of silicic acid is difficult to control, and the particle size and molecular weight of silicic acid are unstable; and polysilicate The stability of iron is not high, so it greatly affects its storage time, and the water after treatment has high salinity, so it is difficult to promote on a large scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) In the stirring state, add demineralized water to the sodium silicate for dilution, and SiO in the diluted liquid sodium silicate 2 The mass content is 3%, Na 2 The mass content of O is 1.0%; the temperature during the dilution is 24° C., the demineralized water is added within 35 minutes, and the stirring speed during the stirring is 80 r / min.

[0023] (2) Pass the liquid sodium silicate obtained in step (1) through an ion exchange resin, polymerize to obtain sodium polysilicate, add acid to the sodium polysilicate solution obtained by polymerization to adjust the pH value to 2, and the temperature is 24 ° C to obtain Na + Content 95mg / L, SiO 2 A sodium polysilicate solution with a content of 2.5% and a sodium polysilicate particle size of 10-12nm.

[0024] (3) Under stirring state, slowly add saturated ferric chloride solution into boiling demineralized water to obtain ferric hydroxide colloidal solution; the stirring speed during the stirring is 80r / min.

[00...

Embodiment 2

[0027] (1) In the state of stirring, add demineralized water with a hardness of less than 1mg / L to the liquid sodium silicate for dilution, the modulus of sodium silicate in the liquid sodium silicate is 3.2, Na 2 O mass content is 8.5%, SiO 2 The mass content is 27.5%, water insoluble matter 0.03wt%, Fe 3+ %0.004wt%, density is 1.375g / ml; SiO in diluted liquid sodium silicate 2 The mass content is 3.5%, Na 2 The mass content of O is 1.2%; the temperature during the dilution is 22° C., the demineralized water is added within 50 minutes, and the stirring speed during the stirring is 90 r / min.

[0028] (2) the liquid sodium silicate that step (1) is obtained is passed through the strongly acidic styrene-based cation-exchange resin ion-exchange resin that the particle diameter is 0.5mm, and the exchange column filling capacity is 55%, and polymerization obtains polysilicate sodium, to polymerization Add acid to the obtained sodium polysilicate solution to adjust the pH value t...

Embodiment 3

[0032] (1) In the stirring state, add demineralized water with a hardness of 0.5mg / L to the liquid sodium silicate for dilution, the modulus of sodium silicate in the liquid sodium silicate is 3.4, Na 2 O mass content is 8.7%, SiO 2 The mass content is 27.8%, water-insoluble 3+ %0.003wt%, density is 1.385g / ml; SiO in diluted liquid sodium silicate 2 The mass content is 4%, Na 2 The mass content of O is 1.3%; the temperature during the dilution is 21° C., the demineralized water is added within 50 minutes, and the stirring speed during the stirring is 100 r / min.

[0033] (2) Before the polymerization, the strongly acidic styrene-based cation exchange resin with a particle diameter of 0.7mm and an exchange column filling capacity of 70% uses 5% dilute hydrochloric acid and 4% dilute sodium hydroxide solution to remove impurities and wash to Neutral, then pass the liquid sodium silicate obtained in step (1) through a strongly acidic styrene-based cation exchange resin to polyme...

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Abstract

The invention discloses a preparing method for polymeric ferric silicate polymolecular flocculant. The preparing method includes the following steps that in a stirring state, softened water is added into sodium silicate for dilution, the dilution temperature is lower than 25 DEG C, and addition of the softened water is finished within 30-60 min; the liquid sodium silicate passes through ion exchange resin to obtain a polymeric sodium silicate solution through polymerization; in a stirring state, a saturated ferric chloride solution is slowly added into the boiling softened water to obtain a ferric hydroxide colloidal solution; the prepared polymeric sodium silicate solution and the ferric hydroxide colloidal solution are added into a reactor by the ratio of Fe:Si=0.5-2, a reaction is finished at the pH value of 2-4 and the temperature of 40 DEG C-60 DEG C, and the product is cured in the reactor for 30-40 min to obtain the polymeric ferric silicate solution. According to the preparing method, the technology is easy to control, industrial production is easy to realize, and the obtained polymeric ferric silicate product is stable in property and good in treatment effect.

Description

technical field [0001] The invention relates to the technical field of flocculants, in particular to a preparation technology of a polysilicate iron polymer flocculant. Background technique [0002] Ferric polysilicate is a new type of inorganic macromolecular flocculant. In the field of water treatment, it has the characteristics of fast coagulation and precipitation, large PH water treatment environment, non-toxic safety, environmental friendliness, and low treatment cost. It can not only treat low-temperature and low-turbidity water well, but also has obvious advantages over other inorganic flocculants, such as less dosage, wide pH range of feeding, short formation time of alum flowers, coarse shape and easy sedimentation, which can shorten the time of water samples The residence time in the treatment system, etc., thus improving the treatment capacity of the system, basically has no effect on the pH value of the treated water. [0003] However, the preparation of existi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F103/28C02F103/30
Inventor 王敬伟赵贝贝
Owner 山东龙港硅业科技有限公司
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