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Method for preparing magnetic adsorbent from coal gangue

A magnetic adsorbent, coal gangue technology, applied in chemical instruments and methods, adsorption water/sewage treatment, magnetic field/electric field water/sewage treatment, etc. problem, to achieve the effect of low cost, simplified preparation process and strong anti-interference ability

Inactive Publication Date: 2020-06-19
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the existing magnetic adsorbents in my country use nano-materials as the magnetic core, which has the disadvantages of high cost, complicated preparation process, high consumption of chemicals, and great environmental impact.

Method used

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  • Method for preparing magnetic adsorbent from coal gangue
  • Method for preparing magnetic adsorbent from coal gangue
  • Method for preparing magnetic adsorbent from coal gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The coal gangue in the Lianghuai area of ​​Anhui Province was used as the raw material for the preparation of the magnetic adsorbent. The volatile content of the coal gangue on a dry basis was 7.91%; the mineral composition (mass fraction): SiO 2 is 61.14%, Al 2 O 3 27.47%, other ingredients 11.39%.

[0026] Magnetic adsorbent preparation process:

[0027] (1) Coal gangue pretreatment: Coal gangue is coarsely crushed by a jaw crusher and finely crushed by a ball mill to obtain fine coal gangue particles, and a vibrating sleeve sieve is used to obtain coal gangue particles with a particle size between 200-300 mesh.

[0028] (2) The coal gangue particles obtained by pretreatment are divided into coal gangue and ferric nitrate nonahydrate (Fe(NO) 3 ) 3 ·9H 2 O) The mass ratio is 5:2 and mix well, add water and stir for 10 minutes, then place in a blast drying oven at 120°C and dry for 8 hours to obtain a mixture.

[0029] (3) The mixture was placed in a closed resist...

Embodiment 2

[0032] The coal gangue in the Lianghuai area of ​​Anhui Province is used as the raw material prepared by the magnetic adsorbent, and the volatile content of the coal gangue is 11.28% on the dry basis; the mineral composition (mass fraction): SiO 2 is 55.82%, Al 2 O 3 25.15%, other ingredients 19.03%. Magnetic adsorbent preparation process:

[0033] (1) Coal gangue pretreatment: Coal gangue is coarsely crushed by a jaw crusher and finely crushed by a ball mill to obtain fine coal gangue particles, and a vibrating sleeve sieve is used to obtain coal gangue particles with a particle size between 200-300 mesh.

[0034] (2) The coal gangue particles obtained by pretreatment are divided into coal gangue and ferric nitrate nonahydrate (Fe(NO) 3 ) 3 ·9H 2 O) The mass ratio is 5:3 and mix well, add water and stir for 10 minutes and then place in a blast drying oven at 120°C for 8 hours to obtain the mixture.

[0035] (3) The mixture was placed in a closed resistance furnace, heat...

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Abstract

The invention discloses a method for preparing a magnetic adsorbent from coal gangue, belongs to the field of resource circulation and environmental protection. The method is characterized in that coal gangue with 5-20% of dry basis volatile components is crushed and screened to 160-300 meshes; inorganic iron salt is used as a catalyst and a magnetizer, and is uniformly mixed with the coal gangueaccording to a mass ratio of 10: 1 to 2: 1; after the mixture is dried, the mixture is directly heated and activated for 2-4 hours at 400-650 DEG C in an air atmosphere; the obtained fired product isground and screened to obtain -325-mesh (the particle size is 45 microns) particles, and strong magnetic particles are extracted by utilizing a magnetic separation technology; and the strong magneticparticles are washed with deionized water until the strong magnetic particles are neutral, and the strong magnetic particles are fully dried at 100-120 DEG C to obtain the magnetic adsorbent. The magnetic active adsorbent is directly prepared by catalyzing and loading an iron-containing compound, so that the environmental problem caused by repeated addition and use of various catalysts, magnetizers and additives is avoided. The prepared magnetic adsorbent not only has high adsorption efficiency on pollutants such as dyes and phosphorus, but also has good magnetic separation performance and good regeneration effect.

Description

technical field [0001] The invention discloses a method for preparing a magnetic adsorbent by using coal gangue, belonging to the field of resource recycling and environmental protection. Background technique [0002] Coal gangue is a by-product produced in the process of coal mining and washing. It is one of the solid wastes discharged in large quantities in my country, and the accumulated accumulation has reached more than 4 billion tons. Huge amount of coal gangue not only occupies a lot of land, but also pollutes the environment. The main structure of coal gangue is silicon-alumina oxide, which also contains oxide components such as Ca, Fe, Mg, etc. The development of adsorbents is an important direction of coal gangue resource utilization. However, the unmodified coal gangue has precise texture, small specific surface area and weak adsorption capacity. At present, the methods of coal gangue modification mainly include physical modification and chemical modification. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30B01J20/28C02F1/28C02F1/48C02F101/10C02F101/30
CPCB01J20/08B01J20/103B01J20/28009C02F1/281C02F1/48C02F2101/105C02F2101/308
Inventor 李建军宋林林张占群宋瀚轩戎鑫刘银练伟
Owner ANHUI UNIV OF SCI & TECH
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