Method for preparing magnetic P-type molecular sieve by using coal gangue

A technology of molecular sieves and coal gangue, which is applied in the field of preparing magnetic P-type molecular sieves from coal gangue, can solve the problems of high cost synthesis of molecular sieves, solid-liquid separation of P-type molecular sieves, etc., so as to improve the reuse rate, reduce the cost of preparation and application, and reduce the The effect of crystallization temperature

Inactive Publication Date: 2017-10-24
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 P-type molecular sieve. Strong adsorption performance, easy to separate solid and liquid of P-type molecular sieve through external magnetic field, and solve the

Method used

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  • Method for preparing magnetic P-type molecular sieve by using coal gangue
  • Method for preparing magnetic P-type molecular sieve by using coal gangue
  • Method for preparing magnetic P-type molecular sieve by using coal gangue

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Example Embodiment

[0030] Example 1

[0031] The method for preparing magnetic P-type molecular sieve from coal gangue in this embodiment includes the following steps:

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

[0033] Step 2: Oxidize the pretreated sample obtained in step 1 at a temperature of 350°C for 2 hours, add a hydrochloric acid solution, and soak for 2 hours at a temperature of 90°C, and obtain a residue and a filtrate after filtration. The filtrate Contains Fe 3+ , Which is composed of Fe in hydrochloric acid solution and coal gangue lime 2 O 3 It is obtained by reaction and dissolution; the mass concentration of the hydrochloric acid solution is 15%, the amount of the hydrochloric acid solution is 5 mL of hydrochloric acid solution per gram of...

Example Embodiment

[0045] Example 2

[0046] The method for preparing magnetic P-type molecular sieve from coal gangue in this embodiment includes the following steps:

[0047] Step 1. Grind the coal gangue to 315 mesh coal gangue powder and place it in an ash dish, then add sodium carbonate to the ash dish, roast for 2.5 hours at a temperature of 890°C, and grind to obtain a pretreated sample; the carbonic acid The mass ratio of sodium to coal gangue powder is 2.5:1;

[0048] Step 2: Oxidize the pretreated sample obtained in step 1 for 1.8 hours at a temperature of 375°C, then add a hydrochloric acid solution, soak for 2.5 hours at a temperature of 95°C, and obtain filter residue and filtrate after filtration. Fe in the filtrate 3+ , Which is composed of Fe in hydrochloric acid solution and coal gangue lime 2 O 3 The oxalic acid and Fe in the filtrate 3+ The molar ratio of the hydrochloric acid solution is 5:1; the mass concentration of the hydrochloric acid solution is 15%, and the amount of the hyd...

Example Embodiment

[0053] Example 3

[0054] The method for preparing magnetic P-type molecular sieve from coal gangue in this embodiment includes the following steps:

[0055] Step 1. Grind the coal gangue to 300 mesh coal gangue powder and place it in an ash dish, then add sodium carbonate to the ash dish, roast it at a temperature of 880°C for 3 hours and grind to obtain a pretreated sample; the sodium carbonate The mass ratio to coal gangue powder is 2:1;

[0056] Step 2. Oxidize the pretreated sample obtained in step 1 for 1.5 hours at a temperature of 400°C, then add a hydrochloric acid solution, soak for 3 hours at a temperature of 90°C, and obtain a residue and a filtrate after filtration. The filtrate Contains Fe 3+ , Which is composed of Fe in hydrochloric acid solution and coal gangue lime 2 O 3 The oxalic acid and Fe in the filtrate 3+ The molar ratio of the hydrochloric acid solution is 5:1; the mass concentration of the hydrochloric acid solution is 15%, and the amount of the hydrochlori...

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Abstract

The invention discloses a method for preparing a magnetic P-type molecular sieve by using coal gangue. The method comprises: 1, grinding coal gangue, and carrying out high temperature calcining activating on the grinded coal gangue by using sodium carbonate; 2, oxidizing at a low temperature, adding hydrochloric acid, soaking, and filtering; 3, preparing an iron-doped molecular sieve from the filtration residue and the filtrate obtained after the filtration; and 4, placing the iron-doped molecular sieve in a porcelain boat, placing the porcelain boat in a tubular furnace, introducing nitrogen into the tube furnace, introducing hydrogen after the air in the tubular furnace is completely discharged, heating to a temperature of 650-700 DEG C, continuously carrying out a reduction reaction for 2-3 h, introducing nitrogen after completing the reaction, and cooling to a room temperature to obtain the magnetic P-type molecular sieve. According to the present invention, the coal gangue is used as the raw material, the Fe<3+> dissolution is performed with hydrochloric acid and is complexed by adding oxalic acid, and finally high temperature reduction is performed to prepare the magnetic P-type molecular sieve; the magnetic P-type molecular sieve has characteristics of high specific surface area and strong adsorption performance; and the magnetic P-type molecular sieve is easy to separate and recover through the external magnetic field, and the problem of high cost of the molecular sieve synthesis is solved.

Description

technical field [0001] The invention belongs to the technical field of P-type molecular sieve preparation, and in particular relates to a method for preparing magnetic P-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 o...

Claims

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Application Information

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IPC IPC(8): C01B39/50B01J20/18
CPCB01J20/18C01B39/50C01P2002/72C01P2002/85C01P2004/03
Inventor 杨建利
Owner XIAN UNIV OF SCI & TECH
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