Method for preparing magnetic 4A molecular sieve from coal gangue

A technology of coal gangue and molecular sieve, which is applied in the field of 4A molecular sieve preparation, can solve the problem of high cost synthesis of molecular sieve, and achieve the effect of reducing preparation and application cost, good crystallinity and improving application.

Inactive Publication Date: 2017-05-31
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 a raw material, and prepares magnetic 4A molecular sieves under the action of ultrasonic vibration heating. The prepared magnetic 4A molecular sieves have high specific surface area, strong adsorption performance, and the advantages of easy solid-liquid separation of the product through an external magnetic field, and solve the problem. It solves the problem of high cost synthesis of molecular sieves, and at the same time provides a new way for the resource utilization, refinement and high-efficiency utilization of coal gangue in the area, so as to achieve the effect of turning waste into treasure, and realize the requirements of environmental protection and low carbon

Method used

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  • Method for preparing magnetic 4A molecular sieve from coal gangue
  • Method for preparing magnetic 4A molecular sieve from coal gangue
  • Method for preparing magnetic 4A molecular sieve from coal gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The present embodiment utilizes coal gangue to prepare magnetic 4A molecular sieve and includes the following steps:

[0034] Step 1: Grind the coal gangue to 320 mesh and place it in an ash pan, then add ammonium chloride to the ash pan, roast it for 2.5 hours at a temperature of 850° C. and grind it to obtain a pretreated sample; the coal gangue is The mass ratio with ammonium chloride is 1.8:1;

[0035] Step 2, FeCl 2 ·4H 2 O and FeCl 3 ·6H 2 O was added to distilled water, stirred at a stirring rate of 750 r / min under nitrogen protection, heated to 80 °C while stirring, and then added NH 3 ·H 2 After 0, continue to stir for 30min to obtain a solid-liquid mixture, after natural cooling, use a magnet to adsorb the magnetic substance in the solid-liquid mixture, then repeatedly wash the adsorbed magnetic substance, and dry it at a temperature of 70°C for 5.5h. get magnetic Fe 3 O 4 ; the FeCl 2 ·4H 2 O, FeCl 3 ·6H 2 O and NH 3 ·H 2 The amount of O added i...

Embodiment 2

[0046] The present embodiment utilizes coal gangue to prepare magnetic 4A molecular sieve and includes the following steps:

[0047] Step 1: Grind the coal gangue to 325 mesh and place it in an ash pan, then add ammonium chloride to the ash pan, roast it for 2 hours at a temperature of 860°C, and grind it to obtain a pretreated sample; The mass ratio of ammonium chloride is 2:1;

[0048] Step 2, FeCl 2 ·4H 2 O and FeCl 3 ·6H 2 O was added to distilled water, stirred at a stirring rate of 1000 r / min under nitrogen protection, heated to 85 °C while stirring, and then added NH 3 ·H 2 After 0, continue to stir for 20min to obtain a solid-liquid mixture. After natural cooling, use a magnet to adsorb the magnetic substance in the solid-liquid mixture. After that, the adsorbed magnetic substance is repeatedly washed, and dried at a temperature of 75°C for 5h to obtain Magnetic Fe 3 O 4 ; the FeCl 2 ·4H 2 O, FeCl 3 ·6H 2 O, NH 3 ·H 2 The amount of O and distilled water a...

Embodiment 3

[0054] The present embodiment utilizes coal gangue to prepare magnetic 4A molecular sieve and includes the following steps:

[0055] Step 1: Grind the coal gangue to 300 mesh and place it in an ash pan, then add ammonium chloride to the ash pan, roast it for 3 hours at a temperature of 850°C, and grind it to obtain a pretreated sample; The mass ratio of ammonium chloride is 1.5:1;

[0056] Step 2, FeCl 2 ·4H 2 O and FeCl 3 ·6H 2 O was added to distilled water, stirred at a stirring rate of 800 r / min under nitrogen protection, heated to 75 °C while stirring, and then added NH 3 ·H 2 After 0, continue to stir for 40 min to obtain a solid-liquid mixture. After natural cooling, use a magnet to adsorb the magnetic substance in the solid-liquid mixture. After that, the adsorbed magnetic substance is repeatedly washed, and dried at a temperature of 65 ° C for 6 h to obtain Magnetic Fe 3 O 4 ; the FeCl 2 ·4H 2 O, FeCl 3 ·6H 2 O and NH 3 ·H 2 The amount of O added is: eve...

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Abstract

The invention discloses a method for preparing a magnetic 4A molecular sieve from coal gangue. The method comprises steps as follows: 1, grinding coal gangue and then roasting and activating the coal gangue at the high temperature with ammonium chloride; 2, preparing magnetic Fe3O4 from FeCl2.4H2O, FeCl3.6H2O and NH3.H2O; 3, preparing a ferroferric oxide dispersion liquid; 4, allowing the activated coal gangue to react with the ferroferric oxide dispersion liquid to prepare the magnetic 4A molecular sieve. The coal gangue is adopted as a raw material, the magnetic 4A molecular sieve is prepared under the action of ultrasonic vibration heating, the prepared magnetic 4A molecular sieve has the advantages that the specific surface area is large, the adsorption performance is high, solid-liquid separation of a product can be realized easily through an external magnetic field and the like, besides, the problem of high synthesis cost of the molecular sieve is solved, a new way is provided for recycling, refinement and efficient utilization of the coal gangue, waste is turned into wealth, and the requirements of environmental protection and low carbon are met.

Description

technical field [0001] The invention belongs to the technical field of 4A molecular sieve preparation, in particular to a method for preparing magnetic 4A molecular sieve by using coal gangue. Background technique [0002] Coal gangue is one of the industrial solid wastes with the largest annual emissions and accumulated stockpiles in my country. Due to its low combustion value, it cannot be used as fuel. The disposal and accumulation of coal gangue will cause great harm to the environment. First, it occupies a large area of ​​land and destroys the ecological environment; second, the escape or leaching of sulfide in coal gangue will pollute the atmosphere, farmland and water bodies; , the leaching water of the gangue mountain can pollute groundwater sources and rivers, affecting crops and aquaculture; the gangue mountain collapses in the rainy season, causing the blockage of the river; some gangue mountains landslides, threatening personnel safety. [0003] The main chemic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/14C01G49/08B01J20/16B01J20/28B01J20/30
CPCB01J20/06B01J20/16C01B39/14C01G49/08B01J20/28009C01P2002/72C01P2004/03C01P2002/82C01P2004/38C01P2004/61C01P2004/80C01P2006/42
Inventor 杨建利杜美利李刚于春侠刘静杨梦茹
Owner XIAN UNIV OF SCI & TECH
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