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Polyacrylamide heavy metal flocculating agent and method for preparing same

A polyacrylamide-based and polyacrylamide technology is applied in the field of polyacrylamide-based heavy metal flocculants and their preparation, which can solve the problems of inability to reach the standard stably, poor sedimentation, and large amount of sludge in acidic heavy metal wastewater, and achieve good The effect of application prospect, fast settling speed and simple and easy governance

Active Publication Date: 2016-07-13
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a polyacrylamide-based heavy metal flocculant to solve the problems of the existing traditional chemical precipitation method for treating acidic heavy metal wastewater with large amount of sludge, poor sedimentation, and failure to reach the standard stably

Method used

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  • Polyacrylamide heavy metal flocculating agent and method for preparing same
  • Polyacrylamide heavy metal flocculating agent and method for preparing same
  • Polyacrylamide heavy metal flocculating agent and method for preparing same

Examples

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Effect test

Embodiment 1

[0030] (1) Weigh 1.0g of polyacrylamide with a relative molecular mass of 3 million, add it to a reactor with magnetic stirring, add 100g of distilled water, stir and dissolve, and make a polyacrylamide solution with a mass percentage concentration of 1.0%; Then add 1.5mL of commercially available formaldehyde solution into the reactor, adjust the reaction temperature to 63°C, stir and react for 90min under the condition of stirring speed 200r / min; then add 7.5mL of commercially available dimethylamine solution into the reactor, The reaction temperature was adjusted to 63°C, and the stirring reaction was continued for 3 hours under the condition of a stirring speed of 200r / min, and the intermediate product amine-methylated polyacrylamide was obtained after cooling;

[0031] (2) Add 1.5mL of sodium hydroxide with a concentration of 40% by mass and 1.5mL of commercially available carbon disulfide into the reactor in step (1), adjust the temperature to 25°C, and stir at a stirring...

Embodiment 2

[0033] (1) Weigh 3.0g of polyacrylamide with a relative molecular mass of 3 million, add it to a reactor with magnetic stirring, add 100g of distilled water, stir and dissolve, and make a polyacrylamide solution with a mass percentage concentration of 3.0%; Then add 4.5 mL of commercially available formaldehyde solution into the reactor, adjust the reaction temperature to 57°C, and stir for 70 minutes at a stirring speed of 200 r / min; then add 22.5 mL of commercially available dimethylamine solution into the reactor, Adjust the reaction temperature to 57°C, and continue to stir the reaction for 2.8 hours under the condition of stirring speed of 200r / min, and obtain the intermediate product amine-methylated polyacrylamide after cooling;

[0034] (2) Add 5.5mL of sodium hydroxide with a concentration of 40% by mass and 5.0mL of commercially available carbon disulfide into the reactor in step (1), adjust the temperature to 20°C, and stir at a stirring speed of 200r / min After reac...

Embodiment 3

[0036] (1) Weigh 4.0g of polyacrylamide with a relative molecular mass of 3 million, add it to a reactor with magnetic stirring, add 100g of distilled water, stir and dissolve, and make a polyacrylamide solution with a mass percentage concentration of 4.0%; Then add 6.0 mL of commercially available formaldehyde solution into the reactor, adjust the reaction temperature to 60°C, and stir and react for 50 min at a stirring speed of 200 r / min; then add 30.0 mL of commercially available dimethylamine solution into the reactor, The reaction temperature was 60°C and the stirring speed was 200r / min, and the stirring reaction was continued for 2.5h, and the intermediate product amine-methylated polyacrylamide was obtained after cooling;

[0037](2) Add 17.0mL of sodium hydroxide with a concentration of 40% by mass and 10.0mL of commercially available carbon disulfide into the reactor in step (1), adjust the temperature to 35°C, and stir at a stirring speed of 200r / min After reacting f...

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Abstract

The invention a polyacrylamide heavy metal flocculating agent and a method for preparing the same.By the aid of the polyacrylamide heavy metal flocculating agent and the method, problems of large acidic heavy metal wastewater and sludge quantities treated by the existing traditional chemical precipitation methods, poor settleability of precipitates and incapability of stably reaching standards can be solved.The polyacrylamide heavy metal flocculating agent comprises polyacrylamide, formaldehyde, dimethylamine, carbon disulfide and sodium hydroxide.A volume ratio of polyacrylamide solution to the formaldehyde to the dimethylamine is 100:6:30-100:1.5:7.5, and a volume ratio of the polyacrylamide solution to the carbon disulfide to the sodium hydroxide is 100:10:17-100:1.5:1.5.The method for preparing the polyacrylamide heavy metal flocculating agent includes preparing amino-methylated polyacrylamide which is an intermediate product; preparing the polyacrylamide heavy metal flocculating agent which is a final product.The polyacrylamide heavy metal flocculating agent and the method have the advantages that required raw materials are easily available, processes for preparing the products are simple, reaction conditions are mild, the polyacrylamide heavy metal flocculating agent and the method are easy to implement and control and have excellent application prospects, and industrial production can be facilitated.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a polyacrylamide-based heavy metal flocculant and a preparation method thereof. Background technique [0002] Nowadays, all kinds of industrial enterprises continuously discharge a large amount of heavy metal wastewater to the environment. Because it cannot be degraded by microorganisms, it becomes a persistent pollutant, causing great environmental pollution and seriously endangering human health. Therefore, in recent years, people have attached great importance to the treatment of heavy metal wastewater, trying to use various technologies and methods to remove heavy metals in wastewater to meet discharge standards, such as chemical precipitation, ion exchange, electrolysis, adsorption, and reverse osmosis. method, biological method and so on. Due to technical or economic reasons, chemical precipitation is still used to treat heavy metal wastewater at home and abroa...

Claims

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Application Information

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IPC IPC(8): C02F1/56
CPCC02F1/56C02F2101/20
Inventor 王刚刁静茹戴亮王志科
Owner LANZHOU JIAOTONG UNIV
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