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Method for preparing coal gangue magnetic adsorbent by two-step method

A magnetic adsorbent, coal gangue technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, magnetic field/electric field water/sewage treatment, etc. problems, to achieve the effect of saving iron salt raw materials, simplifying the preparation process, and strong anti-interference ability

Inactive Publication Date: 2020-06-23
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 coal gangue magnetic adsorbent by two-step method
  • Method for preparing coal gangue magnetic adsorbent by two-step method
  • Method for preparing coal gangue magnetic adsorbent by two-step method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Coal gangue from the Lianghuai area of ​​Anhui Province was used as the raw material for the preparation of the magnetic adsorbent, and the dry basis volatile content of the coal gangue was 7.91%; mineral composition (mass fraction): SiO 2 61.14%, Al 2 o 3 27.47%, other ingredients 11.39%. Magnetic adsorbent preparation process:

[0027] (1) Coal gangue pretreatment: coarsely crush the coal gangue with a jaw crusher and grind with a ball mill to obtain fine coal gangue particles, and use a vibrating sieve to obtain coal gangue particles with a particle size of 200-325 mesh.

[0028] (2) The coal gangue particles obtained by pretreatment were mixed with 12.1g coal gangue and 1.61g ferric nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) Mix well, add water and stir for 10 minutes, then place in a blast oven at 120° C. and dry for 6 hours to obtain a mixture.

[0029] (3) Put the mixed material in a closed electric resistance furnace, rapidly raise the temperature to 450°C, ...

Embodiment 2

[0034] Coal gangue from the Lianghuai area of ​​Anhui Province is used as the raw material for the preparation of the magnetic adsorbent, and the volatile content of the dry basis of coal gangue is 11.28%; mineral composition (mass fraction): SiO 2 55.82%, Al 2 o 3 25.15%, other ingredients 19.03%. Magnetic adsorbent preparation process:

[0035] (1) Coal gangue pretreatment: coarsely crush the coal gangue with a jaw crusher and grind with a ball mill to obtain fine coal gangue particles, and use a vibrating sieve to obtain coal gangue particles with a particle size of 200-325 mesh.

[0036] (2) The coal gangue particles obtained by pretreatment were mixed with 12.1g coal gangue and 2.42g ferric nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) Mix well, add water and stir for 10 minutes, then place in a blast oven at 120° C. and dry for 6 hours to obtain a mixture.

[0037] (3) Place the mixture in a closed electric resistance furnace, rapidly heat up to 450°C, and keep warm for...

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Abstract

The invention discloses a method for preparing a coal gangue magnetic adsorbent by a two-step method, which belongs to the field of resource circulation and environmental protection, and is characterized by comprising the following steps: crushing and screening dry coal gangue to 200-325 meshes, mixing with soluble ferric iron salt according to a mass ratio of 20: 1-4: 1, adding water, stirring, drying, and calcining and activating for 2-4 hours at 400-600 DEG C in an air atmosphere; mixing the cooled fired product with a soluble ferrous salt, wherein the molar ratio of the ferrous salt to theferric salt in the previous step is 1: 1; and drying the mixture, and calcining the dried mixture in a closed resistance furnace at 400-550 DEG C for 1-2 hours; carrying out grinding, screening, magnetic separation and other steps on the obtained fired product to obtain the magnetic adsorbent. The trivalent and divalent iron salts are respectively used as a catalyst and a magnetizer, and the coalgangue adsorbent with strong magnetism is prepared by two-step calcination, 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 two-step method for preparing a coal gangue magnetic adsorbent, which belongs to the field of resource circulation and environmental protection. Specifically, the coal gangue is catalyzed by iron salts and magnetically loaded to prepare a magnetic adsorption material. 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 cumulative accumulation has reached more than 4 billion tons. A huge amount of coal gangue not only takes up a lot of land, but also pollutes the environment. The main structure of coal gangue is silicon-aluminum oxide, and it also contains Ca, Fe, Mg and other oxide components according to the geological conditions of the coal field and different mining and processing methods. Adsorbent development is an important direction of coal gangue resource utilization. However, ...

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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