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A method for magnetic seed regeneration

A magnetic seed and demagnetization technology, applied in chemical instruments and methods, magnetic field/electric field water/sewage treatment, water/sludge/sewage treatment, etc. Achieve the effect of increasing dispersion, increasing contact surface and simple process

Inactive Publication Date: 2021-07-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, there are relatively many researches on magnetic flocculation or magnetic coagulation process, but there are few researches on how to recover and reuse magnetic seeds
Due to the mutual adsorption and agglomeration of the magnetic seeds obtained by the conventional magnetic separation recovery process with various chemicals, sludge particles and magnetic seed particles themselves, the apparent particle size of the magnetic seed particles increases and the surface is covered, making it difficult to obtain high-quality available materials. The reuse of magnetic seeds leads to high cost of using magnetic seeds, which limits the application of magnetic flocculation technology in the field of wastewater treatment technology. Therefore, it is of great significance to develop a method for the regeneration and utilization of magnetic seeds suitable for wastewater treatment.
[0003] At present, the methods for regeneration of magnetic seeds mainly include a method for dispersing and demagnetizing magnetic sludge disclosed in Chinese patent CN105585232A. First, the magnetic sludge is directly heated to 300°C by microwave, and then mixed with 10kg / t or more Polyvinyl alcohol solution is mixed, and after mixing, ultrasonic vibration treatment is performed first, and then the magnetic sludge is sent to the demagnetization field for demagnetization. This method prolongs the service life of magnetic nanoparticles, but this method is more complicated and high temperature. Treatment and the use of large doses of organic chemicals increase the cost of magnetic seed regeneration

Method used

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  • A method for magnetic seed regeneration
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Experimental program
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Embodiment 1

[0017] Magnetic flocculation wastewater clarification: the raw material of wastewater is iron tailings wastewater, the -15μm particle size accounts for 99%, and the weight concentration of ore slime is 2%. Add magnetic seeds to the waste water until its weight concentration is 0.2% (average particle size is 22.46 μm), and add medicament anionic polyacrylamide (APAM) to its concentration of 1.2mg / L, settle after stirring and flocculating to obtain magnetic Kind of slime.

[0018] Magnetic seed recovery and regeneration: introduce the magnetic seed-containing slime obtained by sedimentation into the magnetic separation equipment to recover the magnetic seed suspension solution, and then introduce the magnetic seed suspension solution into the demagnetizer for demagnetization treatment 1.5 min (the magnetic field strength is 200G), to obtain the magnetic seed suspension solution after demagnetization (the mass concentration of the magnetic seed is 30%). Then the magnetic seed so...

Embodiment 2

[0021] It is the iron chloride of 20mg / L that the ferrous chloride that the concentration in embodiment 1 is changed into concentration is 20mg / L, other conditions are constant. The results of the obtained regenerated magnetic seeds for iron tailings wastewater treatment are shown in Table 1.

Embodiment 3

[0023] Concentration in embodiment 1 is that the ferrous chloride of 20mg / L is changed into the magnesium chloride that concentration is 100mg / L, other conditions are constant. The results of the obtained regenerated magnetic seeds for iron tailings wastewater treatment are shown in Table 1.

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Abstract

The invention discloses a method for regenerating magnetic seeds, which comprises the following steps: (1) adding the recovered suspension containing magnetic seeds to demagnetization equipment for demagnetization treatment to obtain a magnetic seed solution after demagnetization; (2) Add inorganic salt to the magnetic seed solution after demagnetization in step (1), and after mixing evenly, carry out an analytical reaction under stirring conditions to wash off the agent and sludge adsorbed on the surface of the magnetic seed, and obtain the inorganic salt containing the magnetic seed. salt solution; (3) filtering the inorganic salt solution containing magnetic seeds in step (2), and after cleaning the magnetic seeds, to obtain regenerated magnetic seeds. The whole process of the present invention does not add toxic chemical reagents, and does not cause secondary pollution; the present invention has simple process, low cost, and is easy to realize the recovery and reuse of magnetic seeds after large-scale water treatment.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for regenerating magnetic seeds. Background technique [0002] At present, there are relatively many studies on magnetic flocculation or magnetic coagulation process, but there are few studies on how to recover and reuse magnetic seeds. Due to the mutual adsorption and agglomeration of the magnetic seeds obtained by the conventional magnetic separation recovery process with various chemicals, sludge particles and magnetic seed particles themselves, the apparent particle size of the magnetic seed particles increases and the surface is covered, making it difficult to obtain high-quality available materials. The reuse of magnetic seeds leads to high cost of using magnetic seeds, which limits the application of magnetic flocculation technology in the field of wastewater treatment technology. Therefore, it has important application significance to dev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/48
CPCC02F1/488
Inventor 伍喜庆岳涛刘天宇
Owner CENT SOUTH UNIV
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