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Cationic flocculant and application thereof

A cationic flocculant and reaction technology, which is applied in the synthesis field of cationic flocculants, can solve the problems of high moisture content of dewatered filter cake, weak electrical neutralization ability, weak floc strength, etc., and achieve improved flocculation treatment effect, sludge Effects with a small amount and a wide range of applications

Inactive Publication Date: 2015-02-04
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently synthesized flocculants have relatively low cationicity, weak electrical neutralization ability, high moisture content of the dehydrated filter cake, and weak floc strength, so that water treatment plants can only use cationic organic flocculants Used in combination with other additives, it will bring great inconvenience to the pre-procedure work of water treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1 Dicyandiamide + formaldehyde + AlCl 3 Cationic flocculant

[0012] Put 210g of dicyandiamide into the reactor, then slowly add 560ml of formaldehyde, prevent bumping during the addition, control the temperature between 30~40℃, stir to dissolve; add 75g of AlCl to the reactor first 3 , React at 60~100℃ for 3 hours, and finally add the remaining 25g AlCl 3 , React at 60-100°C for 2h, then adjust the pH to 8-9 to obtain the target product.

Embodiment 2

[0013] Example 2 Dicyandiamide + formaldehyde + NH 4 Cl cationic flocculant

[0014] Put 210g of dicyandiamide into the reaction kettle, then slowly add 560ml of formaldehyde, prevent bumping during the adding process, control the temperature between 30~40℃, stir to dissolve; first add 48g of NH to the reaction kettle 4 Cl, react at 60~100℃ for 3 hours, and finally add the remaining 17g NH 4 Cl, react at 60-100°C for 2h, then adjust the pH to 8-9 to obtain the target product.

Embodiment 3

[0015] Example 3 Dicyandiamide + formaldehyde + Al 2 (SO 4 ) 3 Cationic flocculant

[0016] Put 210g of dicyandiamide into the reactor, then slowly add 560ml of formaldehyde, prevent bumping during the addition, control the temperature between 30-40℃, stir to dissolve; first add 75g of Al to the reactor 2 (SO 4 ) 3 , React at 60~100℃ for 3 hours, and finally add the remaining 25g Al 2 (SO 4 ) 3 , React at 60-100°C for 2h, then adjust the pH to 8-9 to obtain the target product.

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Abstract

The invention relates to a cationic flocculant and application thereof. An adopted technical scheme is as follows: adding dicyandiamide to a reaction kettle, slowly adding formaldehyde, preventing explosion and boiling, controlling temperature at 30-40 DEG C, and stirring for dissolving; adding metallic salt which accounts for 3 / 4 of total amount to the reaction kettle firstly, reacting at 60-100 DEG C for 2-4h, then adding rest 1 / 4 metallic salt, reacting at 60-100 DEG C for 1-3h, and finally regulating the PH to 8-9, thus obtaining a target product. The dicyandiamide-formaldehyde cationic flocculant disclosed by the invention has the characteristics of being good in decoloring effect, broad in application scope, low influence from PH of wastewater, low addition, little generated sludge and the like; and the cationic flocculant, besides dyed wastewater, also has a good treatment effect on oily sewage, papermaking wastewater, slaughtering wastewater and SCN- in food.

Description

Technical field [0001] The invention belongs to the field of chemical synthesis, and in particular relates to a method for synthesizing a cationic flocculant for treating wastewater containing thiocyanate. Background technique [0002] Due to scientific progress, many chemical plants continue to develop new products and use a large amount of chemical raw materials, making the sewage discharge of enterprises increasingly serious, which seriously harms the environment. At the same time, with the progress of society, people's awareness of environmental protection is getting more and more attention. At present, many modern industrial wastewater contains a large number of inorganic micelles and high concentrations of organic matter. Most of these particles have negative charges on the surface, such as SCN - . The current SCN in wastewater treatment - The conventional method is to fully pass sulfur dioxide into the copper sulfate aqueous solution until there is a strong sulfur dioxide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56
CPCC08G12/16C02F1/56C02F2101/101C02F2101/18C02F2103/22C02F2103/28C02F2103/30
Inventor 房大维单炜军齐明臣臧树良
Owner LIAONING UNIVERSITY
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