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A kind of dispersion demagnetization method of magnetic sludge

A technology for demagnetization and sludge, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve incomplete separation of magnetic carrier and sludge, low efficiency of magnetic carrier reuse, repeated Reduce the number of times of use, etc., to achieve the effect of easy operation, simple method and extended service life

Active Publication Date: 2018-02-16
SCI RES ACADEMY OF GUANGXI ENVIRONMENTAL PROTECTION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The dispersion and demagnetization treatment of magnetic sludge is often washed and sent to a conventional demagnetizer for demagnetization, resulting in incomplete separation of the magnetic carrier from the sludge, poor demagnetization effect, low recycling efficiency of the magnetic carrier, and repeated use Reduced frequency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The magnetic carrier (including 7-21wt% of magnetic particles and 79-93wt% of polymer) is used for the treatment of heavy metal wastewater, and the obtained magnetic sludge is dispersed and demagnetized according to the following steps:

[0016] (1) Heat the magnetic sludge to 300°C under a microwave with a frequency of 2450MHz, keep it for 10 minutes, and then wash it with water at 60°C to obtain particulate matter and sludge water;

[0017] (2) Add 10 kg of polyvinyl alcohol aqueous solution to each ton of particles, and stir the particles obtained in step (1) with the polyvinyl alcohol aqueous solution uniformly to obtain a demagnetization system; wherein the alcoholysis degree of the polyvinyl alcohol aqueous solution is greater than 60%, polymerization The degree is 2000;

[0018] (3) The demagnetization system obtained in step (2) is subjected to ultrasonic oscillation treatment for 15 minutes, and then the demagnetization system is reciprocated 3 times in a demagnetizat...

Embodiment 2

[0021] Magnetic carrier (the magnetic carrier is polydopamine coated on the surface of ferroferric oxide micro-nano particles to form a core-shell structure of composite magnetic micro-nano particles) for the treatment of heavy metal wastewater, the resulting magnetic sludge is as follows Steps to disperse and demagnetize:

[0022] (1) Heat the magnetic sludge to 400°C under a microwave with a frequency of 2450MHz, keep it for 2 minutes, and then wash it with 80°C water to obtain particulate matter and sludge water;

[0023] (2) Add 20kg of polyvinyl alcohol aqueous solution per ton of particles, and stir the particles obtained in step (1) with the polyvinyl alcohol aqueous solution uniformly to obtain a demagnetization system; wherein the alcoholysis degree of the polyvinyl alcohol aqueous solution is greater than 60%, polymerization The degree is 3000;

[0024] (3) The demagnetization system obtained in step (2) is subjected to ultrasonic oscillation treatment for 20 minutes, and ...

Embodiment 3

[0027] The magnetic carrier (including 7-21wt% of magnetic particles and 79-93wt% of polymer) is used for the treatment of heavy metal wastewater, and the obtained magnetic sludge is dispersed and demagnetized according to the following steps:

[0028] (1) Heat the magnetic sludge to 150°C under a microwave with a frequency of 2450MHz, keep it for 20 minutes, and then rinse with water at 40°C to obtain particulate matter and sludge water;

[0029] (2) Add 1kg of polyvinyl alcohol aqueous solution per ton of particles, and stir the particles obtained in step (1) with the polyvinyl alcohol aqueous solution uniformly to obtain a demagnetization system; wherein the alcoholysis degree of the polyvinyl alcohol aqueous solution is greater than 60%, polymerization Degree is 50;

[0030] (3) The demagnetization system obtained in step (2) is subjected to ultrasonic oscillation treatment for 10 minutes, and then the demagnetization system is reciprocated 3 times in a demagnetization magnetic f...

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Abstract

The invention discloses a dispersing and demagnetizing method of magnetic carrier containing sludge. The magnetic carrier containing sludge is heated under microwaves and then flushed with water to obtain particles and sludge water; the obtained particles and a polyvinyl alcohol water solution are evenly stirred, and a demagnetizing system is obtained; then ultrasonic vibration treatment is carried out, then the demagnetizing system enters a conventional demagnetizing magnetic field to do reciprocating motion, and then the demagnetized particles are separated out of the demagnetizing system. The dispersing and demagnetizing method is simple and easy to operate, and the labor intensity of personnel can be effectively relieved. According to the method, the dispersion rate of the sludge and a magnetic carrier can reach 95% or above, the demagnetizing rate of the magnetic carrier reaches 98%, the dispersing and demagnetizing effects are remarkable, the repeated use number of the magnetic carrier obtained after dispersing and demagnetizing is increased by 20 times or more compared with a conventional method, the reuse efficiency is high, the service life of the magnetic nano particles is prolonged, and the cost of sewage treatment is effectively reduced.

Description

Technical field [0001] The invention belongs to the technical field of wastewater treatment, and specifically relates to a dispersion demagnetization method of magnetic sludge. Background technique [0002] Enterprises producing non-ferrous metals discharge wastewater during the entire production process from mining, beneficiation, smelting to product processing. According to the source of wastewater, it can be divided into mining wastewater, beneficiation wastewater, smelting wastewater and processing wastewater. These wastewaters mainly contain antimony, Copper, lead, zinc, cadmium, arsenic, chromium and other heavy metal elements, if they are not handled properly, will easily cause arsenic pollution, cadmium pollution, lead pollution and other heavy metal pollution events that have a significant impact on the ecological environment. Due to the high acidity, the complex types of heavy metal ions, and the existence of multiple valence states and forms of this type of wastewater,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00
CPCC02F11/00
Inventor 黄付平黄枰覃科文韩彪秦学贵
Owner SCI RES ACADEMY OF GUANGXI ENVIRONMENTAL PROTECTION