Preparation process of high concentration polymerized aluminium sulfate flocculant

A polyaluminum sulfate, high-concentration technology, applied in the direction of aluminum sulfate, alkali metal aluminate/aluminum oxide/aluminum hydroxide preparation, chemical instruments and methods, etc. Good control and other issues, to achieve the effect of process simplification and high concentration

Inactive Publication Date: 2009-10-07
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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  • Preparation process of high concentration polymerized aluminium sulfate flocculant
  • Preparation process of high concentration polymerized aluminium sulfate flocculant
  • Preparation process of high concentration polymerized aluminium sulfate flocculant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) The preparation of stable high-concentration sodium metaaluminate: get 311.88g, the NaOH solution that concentration is 42.25%, join in the there-necked flask that has stirrer and reflux device, add 2.57g sodium gluconate, by stirring completely dissolve. Heat to 100°C, gradually add 185.95g of Al(OH) 3 , the temperature was raised to and maintained at 114°C. Al(OH) 3 After complete dissolution, the solution became clear. Then 8.5 g of sulfonate solution (prepared by adding 1 g of sulfonate to 7.5 g of NaOH with a concentration of 67.49% by mass) was added. After adding the sulfonate solution for 1 min, add 5.10 g of ammonium persulfate solution with a mass percent concentration of 16.7% into the solution. Heating was stopped during the process of adding the ammonium persulfate solution, and after all the ammonium persulfate solution was added, the temperature was raised to 120°C and kept for 50 minutes. Then get sodium metaaluminate product.

[0035](2) Polym...

Embodiment 2

[0037] (1) The preparation of stable high-concentration sodium metaaluminate: get 311.88g, the NaOH solution that concentration is 45.27%, joins in the there-necked flask that has stirrer and reflux device, adds 2.57g sodium gluconate, by stirring completely dissolve. Heat to 100°C, gradually add 184.01g of Al(OH) 3 , the temperature was raised to and maintained at 114°C. Al(OH) 3 After complete dissolution, the solution became clear. Then 8.5 g of the sulfonate solution were added. After adding the stabilizer solution for 1 min, add 7.04 g of ammonium persulfate solution with a mass percent concentration of 16.7% into the solution. Heating was stopped during the process of adding the ammonium persulfate solution, and after all the ammonium persulfate solution was added, the temperature was raised to 120°C and kept for 45 minutes. Then get sodium metaaluminate product.

[0038] (2) Polymerization: 8.16 g of sodium silicate was dissolved in 28.5 g of 8.77% sodium carbonat...

Embodiment 3

[0040] (1) The preparation of stable high-concentration sodium metaaluminate: get 311.88g, the NaOH solution that concentration is 47.15%, joins in the there-necked flask that has stirrer and reflux device, adds 2.57g sodium gluconate, by stirring completely dissolve. Heat to 100°C, gradually add 186.55g, the temperature rises to and remains at 114°C. Al(OH) 3 After complete dissolution, the solution became clear. Then 8.5 g of stabilizer solution were added. After adding the sulfonate solution for 3 minutes, add 4.5 g of ammonium persulfate solution with a mass percent concentration of 16.7% into the solution. Heating was stopped during the process of adding the ammonium persulfate solution, and after all the ammonium persulfate solution was added, the temperature was raised to 120°C and kept for 48 minutes. Then get sodium metaaluminate product.

[0041] (2) Polymerization: 6.67g of sodium silicate was dissolved in 28.5g of 8.77% sodium carbonate solution to obtain a mi...

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Abstract

The invention discloses a preparation method of a high-concentration polyaluminium-silicon sulfate flocculant. The method includes two steps of preparation of stable high-concentration sodium metaaluminate and polymerization reaction. The preparation of stable high-concentration sodium metaaluminate is to add sodium gluconate into sodium hydroxide solution at 100-120°C, and add Aluminum hydroxide, stabilizer and initiator ammonium persulfate; the polymerization reaction is to dissolve sodium carbonate in a small amount of water, add sodium silicate to dissolve, and then add sodium metaaluminate to obtain an alkaline intermediate product; the aluminum sulfate solution is lower than In a water bath at 30°C, disperse at a high speed, slowly add the basic intermediate product, mix evenly, stir and mature at 55-60°C to obtain a high-concentration polyaluminum-silicon sulfate flocculant. The flocculant product prepared in the present invention can be stable for half a year at normal temperature without gelling, the alumina content can reach 8.21-10.84%, the basicity is 65.90-72.93%, the degree of polymerization is high, and the proportion of active ingredients is high.

Description

technical field [0001] The invention relates to a flocculant, in particular to a preparation method of a high-concentration polyaluminium-silicon sulfate flocculant, and the flocculant is especially suitable for treating feed water with low temperature and low turbidity. Background technique [0002] Polyaluminium-silicon series flocculant is a new type of inorganic polymer composite flocculant made by introducing polysilicic acid into polyaluminum, which can be regarded as a modified variety of polyaluminum. This kind of flocculant combines the advantages of polysilicic acid and polyaluminum. It not only has the effect of electricity neutralization, but also has the function of adsorption and bridging. Its flocculation performance is better than that of polysilicate and polyaluminum alone. This type of flocculant has the characteristics of fast settling speed, non-toxic and harmless products, and low residual aluminum in water after treatment. It has become a research hotsp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C01B33/00C01F7/74C01F7/76C01F7/04
Inventor 周勤苏彩燕吴友民肖锦
Owner SOUTH CHINA UNIV OF TECH
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