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Prepn process of high concentration polymerized aluminium sulfate flocculant

A polyaluminum sulfate, high-concentration technology, used in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, aluminum compounds, etc. The effect of simplified process and high concentration

Inactive Publication Date: 2007-06-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the production raw materials are easy to obtain, the cost is low, and the production method is simple, but the products produced by this process have many impurities, the composition and concentration are not easy to control, and the stability time is short, only 20 to 30 days

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation of stable high-concentration sodium metaaluminate: Take 311.88g of 42.25% NaOH solution, add it to a three-necked flask with a stirrer and reflux device, add 2.57g sodium gluconate, and stir completely Dissolve. Heat to 100℃, gradually add 185.95g of Al(OH) 3 , The temperature rose to and remained at 114°C. Al(OH) 3 After complete dissolution, the solution became clear. Then add 8.5g sulfonate solution (1g sulfonate is added to 7.5g NaOH with a concentration of 67.49% by mass). After adding the sulfonate solution for 1 min, 5.10 g of ammonium persulfate solution with a mass percentage concentration of 16.7% was added to the solution. The heating was stopped during the process of adding the ammonium persulfate solution. After the ammonium persulfate solution was added, the temperature was raised to 120°C and kept for 50 minutes. Then get the sodium metaaluminate product.

[0035](2) Polymerization reaction: Dissolve 7.50 g of sodium silicate in 28.5 g of a so...

Embodiment 2

[0037] (1) Preparation of stable high-concentration sodium metaaluminate: Take 311.88g of 45.27% NaOH solution, add it to a three-necked flask with a stirrer and reflux device, add 2.57g of sodium gluconate, and stir completely Dissolve. Heat to 100°C and gradually add 184.01g of Al(OH) 3 , The temperature rose to and remained at 114°C. Al(OH) 3 After complete dissolution, the solution became clear. Then 8.5 g of sulfonate solution was added. After adding the stabilizer solution for 1 min, 7.04g of ammonium persulfate solution with a mass percentage concentration of 16.7% was added to the solution. The heating was stopped during the process of adding the ammonium persulfate solution. After the ammonium persulfate solution was added, the temperature was raised to 120° C. and kept for 45 minutes. Then get the sodium metaaluminate product.

[0038] (2) Polymerization reaction: Dissolve 8.16 g of sodium silicate in 28.5 g of a sodium carbonate solution with a concentration of 8.77% to...

Embodiment 3

[0040] (1) Preparation of stable high-concentration sodium metaaluminate: Take 311.88g of NaOH solution with a concentration of 47.15%, add it to a three-necked flask with a stirrer and reflux device, add 2.57g sodium gluconate, and stir completely Dissolve. Heat to 100°C, gradually add 186.55g, and increase the temperature to and maintain at 114°C. Al(OH) 3 After complete dissolution, the solution became clear. Then 8.5 g of stabilizer solution was added. After adding the sulfonate solution for 3 minutes, add 4.5 g of ammonium persulfate solution with a mass percentage concentration of 16.7% to the solution. The heating was stopped during the process of adding the ammonium persulfate solution. After the ammonium persulfate solution was added, the temperature was raised to 120°C and kept for 48 minutes. Then get the sodium metaaluminate product.

[0041] (2) Polymerization reaction: Dissolve 6.67 g of sodium silicate in 28.5 g of a sodium carbonate solution with a concentration of...

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PUM

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Abstract

The present invention discloses preparation process of high concentration polymerized aluminum sulfate flocculant. The preparation process includes two steps of preparing high concentration stable sodium metaaluminate solution and polymerization reaction. During the preparation of high concentration stable sodium metaaluminate solution, sodium gluconate is added into sodium hydroxide solution at 100-120 deg.c, aluminum hydroxide, stabilizer and initiator ammonium persulfate are also added. The polymerization reaction includes dissolving sodium carbonate in small amount of water, adding sodium silicate solution and sodium metaaluminate solution to obtain alkali intermediate product, high speed dispersing aluminum sulfate solution in a water bath and adding the alkali intermediate product slowly, mixing, stirring at 55-60 deg.c to mature and obtain high concentration polymerized aluminum sulfate flocculant. The flocculant has high stability, alumina content of 8.21-10.84 % and basicity of 65.90-72.93 %.

Description

Technical field [0001] The invention relates to a flocculant, in particular to a preparation method of a high-concentration polyaluminum sulfate flocculant. The flocculant is especially suitable for processing low-temperature and low-turbidity raw water supply. Background technique [0002] The polyaluminum-silica flocculant is a new type of inorganic polymer composite flocculant made by introducing polysilicic acid into polyaluminum. It can be regarded as a modified variety of polyaluminum. This type of flocculant combines the advantages of polysilicic acid and polyaluminum, and not only has an electric neutralization effect, but also has an adsorption bridging effect, and its flocculation performance is better than using polysilicic acid and polyaluminum alone. This type of flocculant has the characteristics of fast settling speed, non-toxic and harmless products, and low residual aluminum content in the water after treatment. It has become a research hotspot in the flocculant ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C01F7/00
Inventor 周勤苏彩燕吴友民肖锦
Owner SOUTH CHINA UNIV OF TECH
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