Submicron 4A type molecular sieve and preparation method thereof

A submicron molecular sieve technology, applied in the direction of A-type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the secondary pollution of waste slag, waste alkali and waste liquid, the overall cost needs to be further reduced, and ultrasonic waves are needed and other issues, to achieve the effect of reducing environmental pollution, saving material costs, process and equipment requirements are not high

Pending Publication Date: 2022-05-13
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from its records that the 4A molecular sieve prepared by it has a large particle size, is strip-shaped (block cube), and has a high impurity content; ultrasonic waves are required in the preparation process, and the preparation cost is high; filtration, washing, etc. will produce waste residue, waste alkali and waste Liquid is easy to cause secondary pollution, in addition, its calcium exchange value needs to be further improved, and the overall cost needs to be further reduced

Method used

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  • Submicron 4A type molecular sieve and preparation method thereof
  • Submicron 4A type molecular sieve and preparation method thereof
  • Submicron 4A type molecular sieve and preparation method thereof

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Embodiment 1

[0034] Please see attached Figure 1 ~ Figure 3 , the first submicron 4A molecular sieve method provided in this embodiment is to prepare a cubic 4A molecular sieve, which includes the following steps:

[0035] S1: Prepare quartz-rich coal gangue whose main mineral phase is quartz phase;

[0036] S2: Activate coal gangue: Calcinate the gangue to remove carbon elements and sieve it, mix it with solid NaOH at a ratio of 1:1 to 1:1.5, place it in a muffle furnace for calcination, then take it out and grind it, and then secondary calcination;

[0037] Specific steps: calcinate the gangue at 650°C for 2 hours, remove carbon elements and sieve through 200 meshes, then take 4g of the gangue after treatment, mix evenly according to the ratio of gangue: NaOH=1:1.5; place in Calcined in a muffle furnace at 250°C for 1 hour, then took it out and ground it, mixed it evenly, put it in the muffle furnace again, and calcined at 400°C for 2 hours, so that the quartz and alkali in the coal g...

Embodiment 2

[0048] The embodiment of the present invention provides the second submicron 4A molecular sieve method, which is to prepare a spherical 4A molecular sieve, which includes the following steps:

[0049] S1: Prepare quartz-rich coal gangue whose main mineral phase is quartz phase;

[0050] S2: Activated gangue: Calcinate the gangue to remove carbon elements and sieve it, mix it with solid NaOH at a ratio of 1:1 to 1:1.5, place it in a muffle furnace for calcination, then take it out and grind it, and then calcined;

[0051] S3: Alkali dissolution of insoluble matter: Weigh a set amount of solid NaOH and add deionized water to fully dissolve NaOH to obtain a NaOH solution, add the product in the above step S2 to the NaOH solution, and obtain a mixture after aging at room temperature; Suction filtration of the mixture to separate the solid from the liquid and filter out impurities; then add the filtered impurities to the coal gangue in step S1 for reuse, repeat this process, and f...

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Abstract

The invention discloses a submicron 4A type molecular sieve and a preparation method thereof, the submicron 4A type molecular sieve can be used for preparing a cubic or spherical 4A type molecular sieve, and the preparation method comprises the following steps: S1, preparing coal gangue rich in quartz; s2, activating the coal gangue; s3, dissolving out insoluble substances by alkali; and S4, preparing the pure submicron grade 4A molecular sieve. The submicron grade 4A type molecular sieve prepared by the invention has a single crystal phase, the morphology is a regular blocky cube or sphere with obvious edges and corners, the grain size is uniform, the average grain size is about 0.5 mu m, and the Ca < 2 + > exchange capacity is 323mg CaCO3/g dry basis. According to the method, the submicron 4A type molecular sieve is prepared from the coal gangue rich in quartz, the raw material cost is low, a large amount of coal gangue can be consumed, and waste residues, waste alkali and waste liquid are not generated; meanwhile, the preparation process is simple, the requirements on the process and equipment are not high, and the prepared submicron 4A type molecular sieve is high in purity and strong in calcium ion exchange capacity.

Description

technical field [0001] The invention relates to the technical field of solid waste recycling and utilization and molecular sieve manufacturing, in particular to a submicron 4A molecular sieve and a preparation method thereof. Background technique [0002] Coal gangue is one of the largest industrial solid wastes produced during coal mining. A large amount of coal gangue will not only encroach on cultivated land, but also cause various pollution to the atmosphere, soil, water, etc., and bring great harm to human life. The comprehensive utilization of coal gangue has become a global concern at the end of the last century. [0003] The aperture of the 4A molecular sieve in the prior art is Adsorb water, methanol, ethanol, hydrogen sulfide, sulfur dioxide, carbon dioxide, ethylene, propylene, no adsorption diameter larger than Any molecule (including propane), the selective adsorption performance of water is higher than any other molecule, it is widely used in the drying of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/18
CPCC01B39/18C01P2002/72C01P2004/03C01P2004/62C01P2004/38C01P2004/52
Inventor 布乃敬甄强李榕郑锋王开艺
Owner SHANGHAI UNIV
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