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Application of Fe3O4-based magnetic particles in crystal wastewater treatment

A technology of wastewater treatment and particles, which is applied in the direction of neutralization water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., and can solve the problems of large footprint, low efficiency, and high energy consumption.

Active Publication Date: 2014-04-30
CHINA JILIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The commonly used crystal wastewater treatment technologies include chemical reduction method, electrochemical corrosion method, neutralization method, ion exchange method, electrolysis method, membrane separation method, etc. These technologies have the disadvantages of large investment, high operating cost, long reaction time, and occupied area. Big, low efficiency, high energy consumption and other issues
At present, most of the various crystal wastewater treatment processes use chemical precipitation as their main treatment unit, but due to the inconsistency in the optimal pH range of various metal precipitations, pH control has always been a restrictive factor for chemical precipitation; conventional alkaline precipitation, due to It is not suitable for the treatment of metal complexes. For metal elements such as barium and calcium, it is difficult to meet the special emission requirements in the new standard under the best laboratory conditions.
The heavy metal traps on the market also have some potential application problems, such as the operating conditions vary greatly with water quality, the trapping effect is uncertain, and the cost of reagents is high.

Method used

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  • Application of Fe3O4-based magnetic particles in crystal wastewater treatment

Examples

Experimental program
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Effect test

preparation example Construction

[0009] (1) Preparation and surface functionalization of magnetic seeds:

[0010] Under the protection of argon, in FeSO 4 .7H 2 O concentration is 0.08-0.12mol / L and Fe(NO 3 ) 3 .9H 2 Add ammonia water to adjust the pH to 9.5-11.5 in each 250ml mixed solution with O concentration of 0.06-0.2mol / L; add 20ml of ethylene methyl acrylate solution with a concentration of 0.01-0.02mol / L, magnetically stir, and vacuum at 100-140°C Dry to obtain Fe with a diameter between 200nm and 800nm 3 o 4 Magnetic seed particles, using Ar plasma organic polymerization modification technology to graft acrylic organic film on the surface of magnetic seeds to form magnetic particles with strong capture properties.

[0011] (2) Treatment and purification of crystal wastewater:

[0012] Such as figure 1 As shown, take 50L ~ 100L of crystal industrial wastewater, add the modified Fe prepared above 3 o 4 Granules 10-15g / L, add ammonia water to adjust the pH of the solution to 8.5-10.5, add ino...

Embodiment 1

[0016] Under the protection of argon, take FeSO 4 .7H 2 O0.12mol / L and Fe(NO 3 ) 3 .9H 2 Each 250ml of mixed solutions of 00.06mol / L was added with ammonia water to adjust the pH to 11.5; after adding 0.015mol / L ethylene methyl acrylate, the magnetic force stirred evenly, and vacuum drying at 120°C gave Fe with a diameter of 200nm. 3 o 4 Magnetic seed particles, using Ar plasma organic polymerization modification technology to graft acrylic organic film on the surface of magnetic seeds to form magnetic particles with strong capture properties. Get 50L of crystal industrial waste water, add the modified Fe prepared above 3 o 4 Granules 10g / L, add ammonia water to adjust the pH of the solution to 8.5, add the inorganic additive CaF 2 0.8g / L, 200g, fully stirred for 0.5h. Solid waste is obtained after settling. Take the above-mentioned clear liquid and pass it through the magnetic separator at a flow rate of 50L / h, and control the magnetic field between 0.03-0.3T and cha...

Embodiment 2

[0019] Under the protection of argon, in FeSO 4 .7H 2 O0.1mol / L and Fe(NO 3 )3.9H 2 00.07mol / L of the mixed solution, add ammonia water to adjust the pH to 9.5; add ethylene methyl acrylate 0.01mol / L, stir magnetically, and vacuum dry at 110°C to obtain Fe with a diameter of about 300nm 3 o 4 Magnetic seed particles, using Ar plasma organic polymerization modification technology to graft acrylic organic film on the surface of magnetic seeds to form magnetic particles with strong capture properties. Get 70L crystal industry waste water, add the modified Fe that above-mentioned preparation obtains 3 o 4 Granules 12g / L, add ammonia water to adjust the pH of the solution to 9.0, add inorganic additive CaF 2 0.9g / L, 200g, fully stirred for 0.5h. Solid waste is obtained after settling. Take the above solution and pass it through the magnetic separator at a flow rate of 50L / h, and control the magnetic field between 0.03-0.3T and change it in steps of 0.015T / h for 0.5h to real...

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Abstract

The invention discloses an application of Fe3O4-based magnetic particles in crystal wastewater treatment. By virtue of the application disclosed by the invention, the calcium ions, barium ions, cobalt ion concentration, lead ions, suspended solids SS and COD in the crystal wastewater are remarkably reduced, and the purification of crystal industrial wastewater is realized.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment in the crystal industry, and relates to a Fe-based 3 o 4 Application of magnetic seed particles in crystal wastewater treatment. Background technique [0002] In the mid-1970s, my country began to study and apply the treatment methods of silicate and heavy metal wastewater in the crystal production process more generally, and has achieved certain results so far. The commonly used crystal wastewater treatment technologies include chemical reduction method, electrochemical corrosion method, neutralization method, ion exchange method, electrolysis method, membrane separation method, etc. These technologies have the disadvantages of large investment, high operating cost, long reaction time, and occupied area. Large, low efficiency, high energy consumption and other issues. At present, most of the various crystal wastewater treatment processes use chemical precipitation as their main tr...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/66
Inventor 卫国英葛洪良余云丹江莉孙丽侠
Owner CHINA JILIANG UNIV
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