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Preparation method and application of cellulose graft boracic polyaluminum ferric silicate composite flocculant

A technology of polyaluminum iron silicate and cellulose grafting, which is applied in the field of water treatment, can solve the problems of loss of flocculation effect, poor stability of polysilicate metal salt flocculants, etc., and achieve increased adsorption net capture capacity, CODCr removal rate and High chroma removal rate and the effect of extending molecular chains

Inactive Publication Date: 2014-06-04
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the polysilicate metal salt flocculant has poor stability, and it is easy to polymerize by itself to form a water-insoluble precipitate or gel, which loses the flocculation effect, especially the higher the concentration of polysilicate, the easier it is to form a gel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Prepare a 0.4mol / L sodium silicate solution, add it to a 2mol / L sulfuric acid solution, adjust the pH=5.0, stir quickly until the solution appears light blue, adjust the pH=1.5, continue to stir and polymerize for 2 hours, and obtain a polysilicic acid solution ;

[0018] (2) According to the molar ratio Fe / Si=1.0, Al / Si=1.0, add 1mol / LAl dropwise to the polysilicate solution 3+ solution with 1mol / LFe 3+ After the solution mixture is added dropwise, continue to stir and polymerize for 2 hours to obtain polyaluminum iron silicate.

[0019] (3) Weigh sodium tetraborate according to the B / Si molar ratio = 0.05, add deionized water to dissolve it, add it to polyaluminum iron silicate, and continue stirring for 2 hours to obtain boron-containing polyaluminum iron silicate.

[0020] (4) Weigh the methyl cellulose according to the mass ratio of methyl cellulose: Si = 1:1, add it into deionized water, and heat to 90°C for 2 hours to gelatinize. After the gelatinized cell...

Embodiment 2

[0023] (1) Prepare a 0.4mol / L sodium silicate solution, add it to a 2mol / L sulfuric acid solution, adjust the pH=5.0, stir quickly until the solution appears light blue, adjust the pH=1.5, continue to stir and polymerize for 2 hours, and obtain a polysilicic acid solution ;

[0024] (2) According to the molar ratio of Fe / Si=1.0, Al / Si=1.0, add dropwise 1mol / LAl3+ solution and 1mol / LFe3+ solution mixture into the polysilicate solution, and continue to stir and polymerize for 2 hours after the dropwise addition is completed to obtain polysilicate Iron Aluminum Silicate.

[0025] (3) Weigh sodium tetraborate according to B / Si molar ratio = 0.1, add deionized water to dissolve it, add it to polyaluminum iron silicate, and continue stirring for 2 hours to obtain boron-containing polyaluminum iron silicate.

[0026] (4) Weigh the methyl cellulose according to the mass ratio of methyl cellulose: Si = 1:1, add it into deionized water, and heat to 90°C for 2 hours to gelatinize. Afte...

Embodiment 3

[0029] (1) Prepare 0.5mol / L sodium silicate solution, add it to 2mol / L sulfuric acid solution, adjust pH=5.0, stir quickly until the solution appears light blue, adjust pH=1.5, continue to stir and polymerize for 2 hours, and obtain polysilicic acid solution ;

[0030] (2) According to the molar ratio Fe / Si=1.5, Al / Si=2.0, add 1mol / LAl dropwise to the polysilicate solution 3+ solution with 1mol / LFe 3+ After the solution mixture is added dropwise, continue to stir and polymerize for 2 hours to obtain polyaluminum iron silicate.

[0031] (3) Weigh sodium tetraborate according to the B / Si molar ratio = 0.15, add deionized water to dissolve it, add it to polyaluminum iron silicate, and continue stirring for 2 hours to obtain boron-containing polyaluminum iron silicate.

[0032] (4) Weigh the methyl cellulose according to the mass ratio of methyl cellulose:Si=1.5:1, add it into deionized water, and heat to 90°C for gelatinization for 2 hours. After the gelatinized cellulose is c...

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Abstract

The invention discloses a preparation method and application of a cellulose graft boracic polyaluminum ferric silicate composite flocculant. The cellulose graft boracic polyaluminum ferric silicate composite flocculant is obtained by taking sodium silicate, aluminum salt and ferric salt as main raw materials, polymerizing to prepare polyaluminum ferric silicate in the acid condition, adding boron to perform modification so as to obtain boracic polyaluminum ferric silicate, and then introducing cellulose grafting. The prepared flocculant is mainly used for treatment of printing and dyeing wastewater without regulating wastewater pH, and is high in decolorization rate and CODCr (chemical oxygen demand) removal rate, fast in sedimentation, and small in sludge quantity.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a preparation method and application of a cellulose-grafted boron-containing polyaluminum iron-silicate composite flocculant. Background technique [0002] With the rapid development of our country's economy, the problem of environmental pollution is becoming more and more serious, and the country has also begun to pay attention to the control of pollution. The protection of water resources and wastewater treatment are environmental problems that need to be solved urgently, and flocculation is one of the most important operating processes in water treatment technology. Among them, dye wastewater has the characteristics of complex composition, high concentration, high chroma, and refractory degradation. It is one of the main harmful wastewater in my country. To deal with this type of wastewater, the problem of decolorization must first be solved. Among them, the decolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F1/54C02F103/30
Inventor 田晓薇张丽丹韩春英李增和
Owner BEIJING UNIV OF CHEM TECH