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A method for preparing magnetic 3a molecular sieves from coal gangue

A molecular sieve and coal gangue technology, which is applied in the field of 3A type molecular sieve preparation, can solve the problem of high cost synthesis of molecular sieve, and achieve the effects of improving the reuse rate, reducing the crystallization temperature and saving energy consumption.

Inactive Publication Date: 2020-01-24
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation method uses coal gangue as the main raw material, and utilizes the iron contained in the coal gangue to prepare a magnetic 3A molecular sieve. It has the advantages of strong adsorption performance, easy solid-liquid separation of 3A molecular sieve through external magnetic field, and solves the problem of high cost synthesis of molecular sieve. For the effect of treasure, to achieve the requirements of environmental protection and low carbon

Method used

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  • A method for preparing magnetic 3a molecular sieves from coal gangue
  • A method for preparing magnetic 3a molecular sieves from coal gangue
  • A method for preparing magnetic 3a molecular sieves from coal gangue

Examples

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Effect test

Embodiment 1

[0031] In the present embodiment, the method for preparing magnetic 3A molecular sieves from coal gangue comprises the following steps:

[0032] Step 1: Grind coal gangue to 315 mesh and place it in the ash dish, then add sodium carbonate to the ash dish, roast for 2 hours at a temperature of 900° C. and then grind to obtain a pretreated sample; the sodium carbonate and coal The mass ratio of gangue is 3:1;

[0033] Step 2. Oxidize the pretreated sample obtained in step 1 at a temperature of 350° C. for 2 hours, then add hydrochloric acid solution, soak for 2 hours at a temperature of 90° C., and filter to obtain a filter residue and a filtrate. The filtrate Contains Fe in hydrochloric acid solution and coal gangue 2 o 3 Dissolved Fe 3+ The mass concentration of the hydrochloric acid solution is 15%, and the consumption of the hydrochloric acid solution is 5mL hydrochloric acid solution for every gram of pretreatment sample; The mol ratio of the deionized water and sodium h...

Embodiment 2

[0045] In the present embodiment, the method for preparing magnetic 3A molecular sieves from coal gangue comprises the following steps:

[0046] Step 1: Grind the coal gangue to 315 mesh and place it in the ash dish, then add sodium carbonate to the ash dish, roast for 2.5 hours at a temperature of 890° C. and then grind to obtain a pretreated sample; the sodium carbonate and The mass ratio of coal gangue is 2.5:1;

[0047] Step 2. Oxidize the pretreated sample obtained in step 1 at a temperature of 375° C. for 1.8 hours, then add hydrochloric acid solution, soak for 2.5 hours at a temperature of 95° C., and filter to obtain a filter residue and a filtrate. The filtrate contains Fe in hydrochloric acid solution and coal gangue 2 o 3 Dissolved Fe 3+ ; Fe in the hydrochloric acid and filtrate 3+ The mol ratio of the hydrochloric acid solution is 5:1; the mass concentration of the hydrochloric acid solution is 15%, and the consumption of the hydrochloric acid solution is 5mL ...

Embodiment 3

[0053] In the present embodiment, the method for preparing magnetic 3A molecular sieves from coal gangue comprises the following steps:

[0054] Step 1. Put the coal gangue into the ash dish after grinding it to 300 mesh, then add sodium carbonate to the ash dish, roast for 3 hours at a temperature of 850° C. and then grind to obtain a pretreated sample; the sodium carbonate and coal The mass ratio of gangue is 2:1;

[0055] Step 2. Oxidize the pretreated sample obtained in step 1 at a temperature of 400° C. for 1.5 hours, then add hydrochloric acid solution, soak for 3 hours at a temperature of 90° C., and filter to obtain a filter residue and a filtrate. The filtrate Contains Fe in hydrochloric acid solution and coal gangue 2 o 3 Dissolved Fe 3+ ; Fe in the hydrochloric acid and filtrate 3+ The mol ratio of the hydrochloric acid solution is 5:1; the mass concentration of the hydrochloric acid solution is 15%, and the consumption of the hydrochloric acid solution is 5mL h...

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Abstract

The invention discloses a method for preparing a magnetic 3A type molecular sieve by coal gangue. The method comprises the following steps of grinding the coal gangue into powder, roasting and activating the coal gangue by sodium carbonate at high temperature, oxidizing at low temperature, adding into hydrochloric acid to soak, and filtering, so as to obtain filter residues and a filtrate; compounding with sodium hydroxide, deionized water, potassium chloride and tetrahydrofuran so as to prepare an iron-doped molecular sieve; putting the iron-doped molecular sieve into a ceramic boat, puttingthe ceramic boat into a tubular furnace, and reducing at high temperature, so as to obtain the magnetic 3A type molecular sieve. The prepared magnetic 3A type molecular sieve has the advantages that by using the coal gangue as the raw material, the specific surface area is high, the water adsorbing property is strong, the separating and recycling are easy via an external magnetic field, and the problem of high cost in synthesizing of the 3A type molecular sieve is solved.

Description

technical field [0001] The invention belongs to the technical field of 3A-type molecular sieve preparation, and in particular relates to a method for preparing magnetic 3A-type molecular sieves from coal gangue. 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 Patents(China)
IPC IPC(8): C01B39/14
CPCC01B39/145C01P2004/61
Inventor 杨建利
Owner XIAN UNIV OF SCI & TECH
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