Polyaluminum silicate-cationic starch composite flocculant and preparation method thereof

A technology of cationic starch and composite flocculant, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc. It can solve the problems of poor stability of polysilicate metal salt flocculant, limit the development of sewage treatment effect, and environmental protection impact, and achieve flocculation effect Obvious, extend the molecular chain, enhance the effect of adsorption bridging and

Inactive Publication Date: 2020-06-05
JILIN INST OF CHEM TECH
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Problems solved by technology

[0003] Traditional sewage treatment flocculants mostly use polysilicate metal salt flocculants, but polysilicate metal salt flocculants have problems such as poor stability, large dosage, and easy to cause se

Method used

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  • Polyaluminum silicate-cationic starch composite flocculant and preparation method thereof

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Embodiment 1

[0028] Step 1: Preparation of Cationic Starch

[0029] Dissolve 10 g of starch in a mixture of 25 mL of water and ethanol, add 0.04 mol of cationic etherification agent (CHTPAC) under stirring, then slowly add 1 moL / L of NaOH solution as a catalyst, gelatinize at 70 ° C for 7 h, and the product is Precipitate in ethanol, wash and filter with suction, and dry under vacuum at 50°C to obtain a white powder, which is a cationic starch.

[0030] Step 2: Preparation of polyaluminum silicate-cationic starch composite flocculant

[0031] Specifically take the following steps:

[0032] (1) Configure 50 mL of 0.14 mol / L sodium silicate solution and adjust the pH to 3 with 30 wt% sulfuric acid solution, stir in a water bath for 2 hours, and leave to mature for 24 hours to obtain polysilicic acid;

[0033] (2) Prepare 0.4mol / L aluminum sulfate solution, mix 14.8mL aluminum sulfate solution with polysilicic acid and stir for 5min to obtain polyaluminum silicate solution;

[0034] (3) Us...

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Abstract

The invention discloses a polyaluminum silicate-cationic starch composite flocculant and a preparation method thereof. The preparation method comprises the following steps: acidifying sodium silicatewith sulfuric acid with a certain concentration, stirring in a water bath, carrying out curing to prepare polysilicic acid, preparing a certain molar mass of an aluminum sulfate solution, stirring andblending the aluminum sulfate solution and polysilicic acid in a certain proportion to obtain a polysilicic acid aluminum solution, carrying out treatment on edible starch by using a cationic etherifying agent 3-chloro-2-hydroxypropyl trimethyl ammonium chloride to obtain cationic starch, adding a certain amount of the cationic starch into the polyaluminum silicate solution, stirring in a water bath, and curing to obtain the polyaluminum silicate-cationic starch. The flocculant provided by the invention is composed of modified natural organic matter cationic starch and a polyaluminum silicatesolution, the preparation method is simple, the cost is low, the performance of the obtained flocculant is stable, the effect is better than that of a traditional flocculant, and the flocculant has agood application prospect.

Description

technical field [0001] The technical field of chemical materials of the present invention, more specifically relates to a preparation method of a polyaluminum silicate-cationic starch composite flocculant. Background technique [0002] In water treatment technology, the flocculation method is the most widely used among many methods. The flocculation method is mainly to add flocculants to the sewage, so that the particulate pollutants in the sewage and the flocculants form larger polymer flocs. It falls naturally under the action, so as to achieve the purpose of solid-liquid separation. This method is simple to operate and has a good effect on sewage treatment. [0003] Traditional sewage treatment flocculants mostly use polysilicate metal salt flocculants, but polysilicate metal salt flocculants have problems such as poor stability, large dosage, and easy to cause secondary pollution, which seriously limits the improvement of sewage treatment effects and the industry. The d...

Claims

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Application Information

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IPC IPC(8): C02F1/52
CPCC02F1/52
Inventor 娄大伟李玉莹连丽丽张浩王希越马捷
Owner JILIN INST OF CHEM TECH
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