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Preparation method and application of magnetic X type molecular sieve

A molecular sieve and magnetic technology, applied in the field of X-type molecular sieve preparation, can solve problems such as high cost, achieve strong commercial competitiveness, strong adsorption performance, and reduce crystallization temperature.

Inactive Publication Date: 2017-11-17
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention uses coal gangue to prepare magnetic molecular sieves and proposes a new process for preparing magnetic molecular sieves from coal gangue, which not only solves the high-cost problem of molecular sieve synthesis, but also provides new resources, refinement, and high-efficiency utilization of coal gangue. approach, to achieve the effect of turning waste into treasure, and to meet the requirements of environmental protection and low carbon

Method used

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  • Preparation method and application of magnetic X type molecular sieve
  • Preparation method and application of magnetic X type molecular sieve
  • Preparation method and application of magnetic X type molecular sieve

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preparation example Construction

[0026] A kind of preparation method of magnetic X-type molecular sieve of the present invention, the method comprises the following steps:

[0027] Step 1: Grind coal gangue to 300 mesh to 325 mesh and place it in an ash dish, then add sodium carbonate to the ash dish, roast at a temperature of 880°C to 900°C for 2h to 3h, and then grind to obtain pretreatment Sample; the mass ratio of described coal gangue and sodium carbonate is (2~3): 1;

[0028] Step 2: Oxidize the pretreated gangue powder at 350°C to 400°C for 1.5h to 2h, add hydrochloric acid with a mass concentration of 15%, soak at 90°C to 100°C for 2h to 3h, filter, and add H to the filtrate 2 C 2 o 4 / Fe 3+ Oxalic acid with a molar ratio of 4-6 is used for later use; among them, 0.450g-0.675gH 2 C 2 o 4 ;

[0029] Step 3. After washing the solid in step 2, add sodium hydroxide solid in a mass ratio of 1:1 and grind until mixed evenly. Alkaline fusion at 450°C~500°C for 1.5h~2h, add deionized water and C 6 h ...

Embodiment 1

[0036] In this embodiment, the preparation of magnetic X-type molecular sieve by using coal gangue includes the following steps:

[0037] Step 1: Grind the gangue to 325 mesh and place it in the ash dish, then add coal gangue: sodium carbonate = 1:3 sodium carbonate to the ash dish, roast for 2 hours at a temperature of 900° C. and then grind to obtain the preformed processing samples;

[0038] Step 2. Oxidize the pretreated coal gangue powder at 350°C for 2h, add hydrochloric acid with a mass concentration of 15%, soak at 90°C for 2h, filter, and add H to the filtrate 2 C 2 o 4 / Fe 3+ Oxalic acid with a molar ratio of 4, for subsequent use;

[0039] Step 3. After washing the solid in step 2, add sodium hydroxide solid in a mass ratio of 1:1 and grind until mixed evenly. Alkaline fusion at 450°C for 2 hours, add deionized water and C 6 h 8 o 7 / Al 2 o 3 Citric acid with a molar ratio of 0.65 was aged at 70° C. for 4 h; the aforementioned spare filtrate was added, and ...

Embodiment 2

[0045] In this embodiment, the preparation of magnetic X-type molecular sieve by using coal gangue includes the following steps:

[0046] Step 1: Grind the gangue to 325 mesh and place it in the ash dish, then add coal gangue: sodium carbonate = 1:3 sodium carbonate to the ash dish, roast for 2 hours at a temperature of 900° C. and then grind to obtain the preformed processing samples;

[0047] Step 2. Oxidize the pretreated coal gangue powder at 350°C for 2h, add hydrochloric acid with a mass concentration of 15%, soak at 90°C for 2h, filter, and add H to the filtrate 2 C 2 o 4 / Fe 3+ Oxalic acid with a molar ratio of 6, for subsequent use;

[0048] Step 3. After washing the solid in step 2, add sodium hydroxide solid in a mass ratio of 1:1 and grind until mixed evenly. Alkaline fusion at 450°C for 2 hours, add deionized water and C 6 h 8 o 7 / Al 2 o 3 Citric acid with a molar ratio of 0.75 was aged at 60° C. for 5 h; the aforementioned spare filtrate was added, and ...

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Abstract

The invention discloses a preparation method and an application of a magnetic X type molecular sieve. The preparation method comprises steps as follows: after grinding, coal gangue is subjected to high-temperature roasting and activating with sodium carbonate; the coal gangue is oxidized at the low temperature, hydrochloric acid is added, soaking is performed at the temperature of 90 DEG C, a mixture is filtered, oxalic acid is added to a filtrate, and the filtrate is standby; solids are washed and then dried, sodium hydroxide solids are added, a mixture is ground to be uniformly mixed, and then the mixture is subjected to low-temperature alkali fusion; deionized water and citric acid are added, the mixture is aged at the temperature of 60 DEG C, the standby filtrate is added, a mixed solution is subjected to ultrasonic crystallization, and iron-doped molecular sieve is synthesized; an iron-doped molecular sieve sample is put in a tubular furnace and subjected to high-temperature reduction, and the magnetic X type molecular sieve is prepared. The prepared magnetic X type molecular sieve has the advantages that specific surface area is large, adsorptive property is high, solid-liquid separation of a product can be realized easily through an external applied magnetic field and the like, the problem of high synthesis cost of the molecular sieve is solved, meanwhile, a new way is provided for recycling, refining and efficient utilization of the coal gangue, waste is changed into wealth, and the environment-friendly and low-carbon requirements are met.

Description

technical field [0001] The invention belongs to the technical field of X-type molecular sieve preparation, and in particular relates to a preparation method and application of a magnetic X-type molecular sieve. Background technique [0002] Coal gangue is solid waste discharged during coal mining and coal preparation. It is a black-gray rock with low carbon content and harder than coal that is associated with coal seams during the coal formation process, and has a large output. At present, the application of coal gangue is mainly limited to the construction industry, energy industry and agriculture, and the utilization level and proportion are relatively low. Its large accumulation not only affects the environment but also occupies a large amount of land. Using it to prepare molecular sieves can not only reduce pollution, expand the source of raw materials for molecular sieves, but also increase its added value and expand the utilization of coal gangue. There are two types ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/22B01J20/18B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/18B01J20/28009B01J20/28057C01B39/22C01P2002/72C01P2002/85C01P2004/03C02F1/281C02F2101/20
Inventor 杨建利
Owner XIAN UNIV OF SCI & TECH
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