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Method for preparing W-type molecular sieve by activating potassium feldspar through KOH alkali fusion

A technology for activating potassium feldspar and molecular sieves, applied in chemical instruments and methods, molecular sieves and alkali exchange compounds, inorganic chemistry, etc., can solve problems such as cumbersome steps, and achieve simple process operation, high potassium ion exchange capacity, and few steps. Effect

Pending Publication Date: 2021-09-21
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method avoids the disadvantages caused by the large amount of water in the synthesis system, but the steps are cumbersome, and it is difficult to synthesize chemical reagents.

Method used

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  • Method for preparing W-type molecular sieve by activating potassium feldspar through KOH alkali fusion
  • Method for preparing W-type molecular sieve by activating potassium feldspar through KOH alkali fusion
  • Method for preparing W-type molecular sieve by activating potassium feldspar through KOH alkali fusion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Potassium feldspar activation and material preparation

[0039] Mix potassium feldspar and KOH evenly in a certain proportion, wherein the mass ratio of potassium feldspar to KOH is 1:1.25. Put the mixed system at 400°C for activation reaction for 2h. (At this time, n(SiO 2 ) / n(Al 2 o 3 )=6.742, n(K 2 O) / n(SiO 2 )=1.055)

[0040] The purpose of activation is to destroy the structure of potassium feldspar, and the mechanism is that KOH under high temperature conditions destroys the framework structure of potassium feldspar to realize K + The dissolution of potassium feldspar makes the resources in potassium feldspar into resources that can be directly used, so the composition is the amount of potassium feldspar itself plus KOH.

[0041] (2) Feed

[0042]Add sodium silicate, aluminum sulfate and water to the activation product obtained above, and obtain W-type zeolite synthesis system slurry after stirring; wherein, in the synthesis system slurry after feeding...

Embodiment 2

[0053] (1) Activation and material preparation

[0054] Mix potassium feldspar and KOH evenly in a certain proportion, and the mass ratio of potassium feldspar to KOH is 1:1.5. The mixed system was placed at 550°C for an activation reaction for 1.0 h. (At this time, n(SiO 2 ) / n(Al 2 o 3 )=6.742, n(K 2 O) / n(SiO 2 )=1.250)

[0055] (2) Feed

[0056] Add sodium silicate, aluminum sulfate and water to the activated product obtained above, and obtain W-type zeolite synthesis system slurry after stirring;

[0057] Among them, in the synthesis system slurry, n(K 2 O) / n(SiO 2 )=0.90, n(SiO 2 ) / n(Al 2 o 3 )=9.5, n(H 2 O) / n(SiO 2 )=42;

[0058] (Conversion instructions: take n(SiO 2 ) when the molar mass is 1, by n(K 2 O) / n(SiO 2 )=0.90, n(K 2 O) molar weight is 0.90; by n(SiO 2 ) / n(Al 2 o 3 )=9.5, n(Al 2 o 3 ) molar weight is 0.105; by n(H 2 O) / n(SiO 2 )=42, n(H 2 O) The molar weight is 42. It can be obtained that the molar ratio K 2 O:SiO 2 :Al 2 o 3 :H...

Embodiment 3

[0066] (1) Activation and material preparation

[0067] Mix potassium feldspar and KOH evenly in a certain proportion, and the mass ratio of potassium feldspar to KOH is 1:1.5. Put the mixed system at 500°C for activation reaction for 2h. (At this time, n(SiO 2 ) / n(Al 2 o 3 )=6.742, n(K 2 O) / n(SiO 2 )=1.250)

[0068] (2) Feed

[0069] Add sodium silicate, aluminum sulfate and water to the activated product obtained above, and obtain W-type zeolite synthesis system slurry after stirring;

[0070] Among them, in the synthesis system slurry, n(K 2 O) / n(SiO 2 )=1.14, n(SiO 2 ) / n(Al 2 o 3 )=5.0, n(H 2 O) / n(SiO 2 )=42;

[0071] (Conversion instructions: take n(SiO 2 ) when the molar mass is 1, by n(K 2 O) / n(SiO 2 )=1.14, n(K 2 O) molar weight is 1.14; by n(SiO 2 ) / n(Al 2 o 3 )=5.0, n(Al 2 o 3 ) molar weight is 0.2; by n(H 2 O) / n(SiO 2 )=42, n(H 2 O) The molar weight is 42. It can be obtained that the molar ratio K 2 O:SiO 2 :Al 2 o 3 :H 2 O=1.14:1:0....

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Abstract

The invention relates to a method for preparing a W-type molecular sieve by activating potassium feldspar through KOH alkali fusion. According to the method, after KOH is used for activating potassium feldspar, a small amount of sodium silicate, aluminum sulfate and water are supplemented, and static crystallization is performed for a certain time at a certain temperature, so that the W-type molecular sieve with uniform morphology and good crystallization can be obtained. According to the process, only a small amount of water needs to be supplemented, an aging step in a hydrothermal method is avoided, the potassium feldspar is fully utilized, and a new thought is provided for simply and rapidly synthesizing the molecular sieve by taking minerals as raw materials.

Description

technical field [0001] The invention relates to a new method for preparing W-type molecular sieves by activating potassium feldspar by KOH alkali fusion, and the product W-type molecular sieves can be used as ion exchangers, adsorbents and slow-release potassium fertilizers. Background technique [0002] Currently, global potash demand recently surpassed 32 million metric tons K 2 O, and is expected to grow significantly over the next decade. As a large agricultural country, China is seriously short of potassium resources and soluble potassium resources. Potassium feldspar, as a kind of potassium-containing framework aluminum silicate water-insoluble mineral, has huge reserves, up to 79.14×10 8 It is proposed as an alternative source of potassium fertilizer, but it has a relatively stable Si-Al-O three-dimensional network structure, high melting point and thermal stability, and cannot be directly absorbed by plants as a potassium-containing fertilizer. Therefore, comprehe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02C01B39/46
CPCC01B39/02C01B39/46C01P2002/72C01P2004/03
Inventor 李雲杨凯曹吉林郭宏飞陈学青张广林
Owner HEBEI UNIV OF TECH
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