Modified red mud porous ceramic, preparation method and application thereof

A porous ceramic and modified technology, applied in the field of ceramics, can solve the problems of difficult recycling, poisoning and deactivation of catalysts, harming the natural environment, etc., and achieve the effects of avoiding deformation and breaking, good contact adsorption, and high apparent porosity.

Pending Publication Date: 2020-10-27
INNER MONGOLIA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the chemical precipitation method requires the use of chemical reagents, and there is a risk of secondary pollution; the electrolysis method consumes a lot of energy; Selecting the polluting ions that need to be treated requires a complex process and a large workload; while the adsorption method has the advantages of low cost, simple process, and multiple uses, and has been widely concerned
Clay ceramsite is the traditional adsorption filter material, but as an unsustainable resource, clay is difficult to achieve large-scale promotion, while red mud is a solid waste discharged during the alumina production process, with a huge output, a large amount of land occupation, and serious harm to the natural environment , using red mud for water treatment can realize the utilization of waste resources
However, when red mud is directly applied to wastewater treatment, the metal ions and organic matter contained in red mud may be leached under certain conditions. It is very difficult to separate from the water body after adsorbing pollutants, and it is difficult to recycle. It may even cause secondary pollution

Method used

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  • Modified red mud porous ceramic, preparation method and application thereof
  • Modified red mud porous ceramic, preparation method and application thereof
  • Modified red mud porous ceramic, preparation method and application thereof

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preparation example Construction

[0026] The present invention also provides a method for preparing the modified red mud porous ceramic described in the above technical solution, comprising the following steps:

[0027] (1) The mixture comprising red mud, fly ash, pore forming agent, foam stabilizer and water is sequentially subjected to molding treatment and sintering treatment to obtain a ceramsite blank;

[0028] (2) performing pretreatment and modification treatment on the ceramsite blank in turn to obtain a modified ceramsite precursor;

[0029] (3) The modified ceramsite precursor is dried and then fired to obtain a modified red mud porous ceramic.

[0030] In the present invention, unless otherwise specified, all the preparation raw materials are commercially available products well known to those skilled in the art.

[0031] In the invention, the mixture including red mud, fly ash, pore forming agent, foam stabilizer and water is sequentially subjected to molding treatment and sintering treatment to o...

Embodiment 1

[0052] according to figure 1 The flow chart shown is for the preparation of modified red mud porous ceramics:

[0053] According to red mud and fly ash total amount 61wt.% (red mud and fly ash mass ratio are 4: 1), stearic acid 20wt.%, borax 4wt.%, water 15wt.% ratio relation, red mud , fly ash, stearic acid, borax and water are mixed and then pelletized to obtain a spherical mixed body.

[0054] Dry the sphere mixed body in a blast drying oven at 100°C for 2 hours, sieve out the sphere mixed body with a particle size of 4-8 mm, and then sinter at 1150°C for 30 minutes to obtain a ceramsite green body .

[0055] Soak the ceramsite blank in 1mol / L hydrochloric acid solution for 24 hours, rinse it repeatedly with deionized water until it becomes neutral, and dry it in a drying oven at 100°C for 2 hours to obtain the ball blank to be modified.

[0056] Take 100mL of 0.1mol / L lanthanum nitrate solution and place it in a 250mL Erlenmeyer flask, add 20g of ball billet to be modif...

Embodiment 2

[0059] According to red mud and fly ash mass ratio is 9:1, stearic acid 20wt.%, borax 4w.t%, water 15wt.% ratio relation, red mud, fly ash, stearic acid, borax and water After mixing, it is pelletized to obtain a sphere-mixed green body.

[0060] Dry the sphere mixed body in a blast drying oven at 100°C for 2 hours, sieve out the sphere mixed body with a particle size of 4-8 mm, and then sinter at 1150°C for 30 minutes to obtain a ceramsite green body .

[0061] Soak the ceramsite blank in 1mol / L hydrochloric acid solution for 24 hours, rinse it repeatedly with deionized water until it becomes neutral, and dry it in a drying oven at 100°C for 2 hours to obtain the ball blank to be modified.

[0062] Take 100mL of 0.1mol / L lanthanum nitrate solution and place it in a 250mL Erlenmeyer flask, add 20g of ball billet to be modified, and soak at 45°C for 12h to obtain the modified ceramsite precursor. During the soaking process, the Erlenmeyer flask should be The rubber stopper is...

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Abstract

The invention belongs to the technical field of ceramics, particularly relates to modified red mud porous ceramic, a preparation method and application thereof, and provides modified red mud porous ceramic, which comprises porous structure ceramic particles and modified element compounds fixed on the surfaces and the internal pore channels of the porous structure ceramic particles. According to the invention, modified element compounds in modified red mud porous ceramic are fixed on the surface of red mud porous ceramsite and the surfaces of the internal pore channels, so that fluorine ions inF-containing wastewater are removed; and the porous and granular red mud ceramic adsorption filter material is convenient for separation of the adsorption filter material from the water body, and canbe adsorbed and recycled again after desorption; and experimental data show that the modified red mud porous ceramic provided by the invention has a porous structure, the apparent porosity reaches 44.1%, the crushing strength reaches 637.486 N/particle, and the removal rate of fluorine ions in F-containing wastewater can reach 72.5%.

Description

technical field [0001] The invention belongs to the technical field of ceramics, in particular to a modified red mud porous ceramic and its preparation method and application. Background technique [0002] The total amount of fresh water resources in my country is relatively rich, but our country is a populous country, the per capita share is less than 1 / 3 of the world's average level, and the problem of water pollution is still prominent, so there is an urgent need for an efficient treatment method for sewage. [0003] Commonly used water treatment methods include chemical precipitation, electrolysis, catalytic degradation and adsorption. Among them, the chemical precipitation method requires the use of chemical reagents, and there is a risk of secondary pollution; the electrolysis method consumes a lot of energy; Selecting the polluting ions that need to be treated requires a complex process and a large workload; while the adsorption method has the advantages of low cost,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B33/135C04B33/132C02F1/28C02F101/14
CPCC04B38/0675C04B38/0645C04B38/06C04B33/1321C04B33/1352C02F1/281C02F2101/14Y02P40/60
Inventor 李涛席磊王杰麻永林邢淑清
Owner INNER MONGOLIA UNIV OF SCI & TECH
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