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Magnetic coagulant and preparation method thereof

A coagulant and magnetic technology, applied in chemical instruments and methods, magnetic field/electric field water/sewage treatment, water pollutants, etc., can solve the problems of high production cost of magnetic seeds and complicated process, and reduce the content of COD Effect

Pending Publication Date: 2020-06-12
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no research on the use of fly ash as a magnetic coagulant
However, the magnetic coagulation precipitation technology in the prior art still has the disadvantages of high production cost of magnetic seeds and complicated process flow.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The invention provides a kind of preparation method of magnetic coagulant, comprises the steps:

[0020] (1) the fly ash is sorted into magnetic fly ash and non-magnetic fly ash;

[0021] (2) modifying the non-magnetic fly ash by using a modifier to obtain the modified fly ash;

[0022] (3) Mix magnetic fly ash and modified fly ash to prepare magnetic coagulant.

[0023] The fly ash of the invention comes from by-products produced by coal-fired power plants, and the invention separates the fly ash into magnetic fly ash and non-magnetic fly ash.

[0024] In the present invention, the method for separating fly ash is preferably magnetic separation.

[0025] The invention uses a modifier to modify the non-magnetic fly ash to obtain the modified fly ash.

[0026] The non-magnetic fly ash of the present invention is preferably refined before modification treatment.

[0027] In the present invention, the refined particle size is preferably less than 75 microns, more prefe...

Embodiment 1

[0052] (1) Pretreatment of fly ash

[0053] Take fly ash, put a 15×20×2.5cm magnet block into the fly ash and stir, carry out magnetic separation, collect the fly ash on the surface of the magnet, which is magnetic fly ash, weigh 20g for use. Take the remaining fly ash from magnetic separation and pass it through a 200-mesh sieve, weigh 20 g of undersieve, and grind to obtain non-magnetic fly ash with a particle size less than 75 microns.

[0054] (2) Preparation of modifier

[0055] Take 37% hydrochloric acid and 98% sulfuric acid and mix them at a ratio of 1:3 to obtain a mixed acid, and mix 1g of sodium chloride with 20ml of the mixed acid to prepare a modifier.

[0056] (3) Modification treatment

[0057] The modifier prepared in the step (2) is added to the non-magnetic fly ash obtained in the step (1), and the non-magnetic fly ash is modified. Shaking and stirring at room temperature for 1 hour, suction filtration after the reaction, drying in an oven at 105°C for 1 h...

Embodiment 2

[0062](1) Pretreatment of fly ash

[0063] Take fly ash, put a 15×20×2.5cm magnet block into the fly ash and stir, carry out magnetic separation, collect the fly ash on the surface of the magnet, which is magnetic fly ash, weigh 20g for use. Take the remaining fly ash from the magnetic separation and pass through a 200-mesh sieve, weigh 20 g of the undersieve, and grind to obtain non-magnetic fly ash with a particle size of 75 microns.

[0064] (2) Preparation of modifier

[0065] Take hydrochloric acid and sulfuric acid with a concentration of 37% and 98%, respectively, and mix them according to the ratio of 1:3 to obtain a mixed acid, and mix 1g of ammonium fluoride with 20ml of the mixed acid to prepare a modifier.

[0066] (3) Modification treatment

[0067] The modifier prepared in the step (2) is added to the non-magnetic fly ash obtained in the step (1), and the non-magnetic fly ash is modified. The reaction was shaken and stirred at room temperature for 1 h, then pl...

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Abstract

The invention belongs to the technical field of coagulants, and provides a magnetic coagulant and a preparation method thereof. The preparation method of the magnetic coagulant comprises the followingsteps: (1) sorting fly ash into magnetic fly ash and non-magnetic fly ash; (2) carrying out modification treatment on the non-magnetic fly ash by using a modifier to obtain modified fly ash; and (3)mixing the magnetic fly ash and the modified fly ash to prepare the magnetic coagulant. The magnetic coagulant provided by the invention can be used for removing substances such as colloid, suspendedmatters and organic pollutants in sewage, so that the content of COD in water is reduced, and meanwhile, the problems of over-high magnetic seed production cost, complex process flow and the like in amagnetic coagulating sedimentation technology are solved.

Description

technical field [0001] The invention relates to the technical field of coagulants, in particular to a magnetic coagulant and a preparation method thereof. Background technique [0002] my country is a country short of water resources, and the water resource problem restricts the development of the country to a certain extent. In recent years, with the progress of industrialization and urbanization in our country, the phenomenon of water pollution has become increasingly prominent, and the cost of sewage treatment has also increased. Fly ash comes from the by-products of coal-fired power plants. China is a large coal-producing and coal-consuming country. China's coal-fired power generation can produce hundreds of millions of tons of fly ash every year. Today, fly ash has become one of the largest industrial wastes in my country, and a large amount of fly ash without treatment will cause great damage and impact on the environment. Fly ash particles are porous honeycomb struc...

Claims

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Application Information

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IPC IPC(8): C02F1/48C02F101/30
CPCC02F1/488C02F2101/30
Inventor 齐立强刘堃杨王瑞涛李晶欣王旭
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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