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A method for preparing magnetic p-type molecular sieves from 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: 2019-12-13
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 problem of high cost synthesis of molecular sieves, and at the same time provide a new way for resource recovery, refinement and high-efficiency utilization of coal gangue to achieve the goal of turning waste into treasure effect, to achieve the requirements of environmental protection and low carbon

Method used

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  • A method for preparing magnetic p-type molecular sieves from coal gangue
  • A method for preparing magnetic p-type molecular sieves from coal gangue
  • A method for preparing magnetic p-type molecular sieves from coal gangue

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Effect test

Embodiment 1

[0031] Utilize coal gangue to prepare the method for magnetic P-type molecular sieve in the present embodiment and comprise the following steps:

[0032] Step 1: Grind 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 then 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, 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 3+ , which is composed of hydrochloric acid solution and Fe in gangue ash 2 o 3 Reaction and dissolution are obtained; the mass concentration of the hydrochloric acid solution is 15%, and the consumption of the hydrochloric acid solution is to add 5mL hydrochloric acid solution ...

Embodiment 2

[0046] Utilize coal gangue to prepare the method for magnetic P-type molecular sieve in the present embodiment and comprise the following steps:

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

[0048] 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 3+ , which is composed of hydrochloric acid solution and Fe in gangue ash 2 o 3 obtained by reaction and dissolution; the oxalic acid and the Fe in the filtrate 3+ The mol ratio is 5:1; The mass concentration of described hydrochloric acid solution is 15%, and the consumption of hydrochl...

Embodiment 3

[0054] Utilize coal gangue to prepare the method for magnetic P-type molecular sieve in the present embodiment and comprise the following steps:

[0055] Step 1: Grind the coal gangue to 300 mesh coal gangue powder and place it in the ash dish, then add sodium carbonate to the ash dish, roast for 3 hours at a temperature of 880° C. and then 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 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 3+ , which is composed of hydrochloric acid solution and Fe in gangue ash 2 o 3 obtained by reaction and dissolution; the oxalic acid and the Fe in the filtrate 3+ The mol ratio is 5:1; The mass concentration of described hydrochloric acid solution is 15%, and the consum...

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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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Patent Type & Authority Patents(China)
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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