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A kind of preparation method of boropolysilicate aluminum iron-chitosan composite flocculant

A technology of polyaluminum-iron-silicate and composite flocculants, which is applied in the fields of chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sludge/sewage treatment, etc. Large dosage and other problems, to achieve the effect of environmental protection in the preparation process, good flocculation effect, and strong adsorption characteristics

Active Publication Date: 2022-03-29
ZHENGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantages of inorganic polymer flocculants are simple operation, good water purification effect, and low cost, but the disadvantages are that the flocs generated are small, the dosage is large, and there are many metal ions residues, which are difficult to degrade and easily cause secondary pollution; natural organic high Molecular flocculants are less affected by pH and temperature, and have a wide range of applications, but are expensive and difficult to popularize.

Method used

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  • A kind of preparation method of boropolysilicate aluminum iron-chitosan composite flocculant
  • A kind of preparation method of boropolysilicate aluminum iron-chitosan composite flocculant
  • A kind of preparation method of boropolysilicate aluminum iron-chitosan composite flocculant

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preparation example Construction

[0026] The borosilicate aluminum iron-chitosan composite flocculant involved in the present invention is prepared from aluminum sulfate, iron sulfate, sodium silicate, sodium tetraborate and chitosan as raw materials, and the specific preparation method comprises the following steps:

[0027] 1) Preparation of polysilicic acid: Add a sodium silicate solution with a concentration of 0.5mol / L to a sulfuric acid solution with a volume fraction of 50%, adjust the pH=3~3.5, stir at 30°C, and polymerize for 30~40min. Transparent light blue, made of polysilicic acid;

Embodiment 1

[0031] (1) Prepare 0.5mol / L sodium silicate solution, add it to sulfuric acid solution with a volume fraction of 50%, adjust pH=3.0, stir at 30°C and 500r / min, and the solution will be transparent and light blue after polymerization for 30 minutes. Prepare polysilicic acid solution;

[0032] (2) Add 0.5mol / L aluminum sulfate, 0.5mol / L ferric sulfate, 0.1mol / L sodium tetraborate and 10g / L chitosan acetic acid solution, adjust the pH with a 50% sulfuric acid solution to make the pH = 1.5, stir at 30°C and 500r / min for 1h, After static aging for 1 day, the composite flocculant of iron aluminum borosilicate-chitosan was prepared.

[0033] Add 0.5mL flocculant to 500mL kaolin simulated wastewater, first stir at 300r / min for 2min, then stir at 100r / min for 8min, let stand for 15min and take the supernatant to measure the turbidity removal rate, the turbidity removal rate is 99.01% .

Embodiment 2

[0035] The preparation process is the same as in Example 1, except that chitosan / Si (mass ratio)=0.08.

[0036] Add 0.5mL flocculant to 500mL kaolin simulated wastewater, first stir at 300r / min for 2min, then stir at 100r / min for 8min, let stand for 15min and take the supernatant to measure the turbidity removal rate, the turbidity removal rate is 99.26% .

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Abstract

The invention provides a method for preparing a boropolysilicate aluminum iron-chitosan composite flocculant. The preparation method uses aluminum sulfate, iron sulfate, sodium silicate, sodium tetraborate and chitosan as raw materials, and first utilizes silicon sodium borate in sulfuric acid solution to prepare polysilicic acid; secondly, add aluminum sulfate, ferric sulfate, sodium tetraborate and chitosan acetic acid solution in polysilicic acid solution to prepare boropolysilicate aluminum iron-chitosan composite flocculation agent. The composite flocculant prepared by the preparation method of the present invention is a novel flocculant with high efficiency, environmental protection and low cost, and has the advantages of stable performance, good storage performance, convenient use and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of water treatment agents, and relates to a method for preparing a boropolysilicate aluminum iron-chitosan composite flocculant. , through the control of various factors, the best preparation method of boropolysilicate aluminum iron-chitosan composite flocculant was studied. Background technique [0002] Flocculation and sedimentation technology is widely used in water treatment process because of its simple process, cost-effectiveness and convenient operation. The core part of flocculation and sedimentation technology is the application of flocculant, and the performance of flocculant directly affects the quality of water treatment. The advantages of inorganic polymer flocculants are simple operation, good water purification effect, and low cost, but the disadvantages are that the flocs generated are small, the dosage is large, and there are many metal ions residues, which are difficult to de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/56C02F1/52
CPCC02F1/5236C02F1/56
Inventor 李桂荣刘萍贾胜勇许文峰乔海兵李芃林杜棒
Owner ZHENGZHOU UNIV
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