Method for preparing total potassium W type molecular sieve by activating potassium feldspar via KOH sub-molten salt

A technology for activating potassium feldspar and sub-molten salt, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of increasing process cost, difficulty in operability, complicated system processing, poor system fluidity, etc., and saves energy and raw materials. Wide source, low cost effect

Active Publication Date: 2014-12-03
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

(Article "KOH Alkali Fusion Activation of Potassium Feldspar to Produce Full Potassium W-type Molecular Sieve" Article Number: 1000-985X(2014) 01-0153-10 "Acta Synthetic Crystallography") However, there are still deficiencies in the process: the activation temperature of potassium feldspar Up to 500°C, high energy consumption, increased process cost and difficulty in operability
At the same time, the reaction is a pure solid phase reaction, the fluidity of the system is poor, and the treatment of the activated system is relatively complicated

Method used

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  • Method for preparing total potassium W type molecular sieve by activating potassium feldspar via KOH sub-molten salt
  • Method for preparing total potassium W type molecular sieve by activating potassium feldspar via KOH sub-molten salt
  • Method for preparing total potassium W type molecular sieve by activating potassium feldspar via KOH sub-molten salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Activation and preparation

[0040] KOH (purity is 85%) 35.2943g, water 7.5ml join in the there-necked bottle and mix evenly, make initial alkali concentration namely KOH mass concentration be 70%, then potassium feldspar ore powder 9.9998g is joined in the there-necked bottle and KOH and Mix the water evenly so that the mass ratio of mineral alkali to potassium feldspar:KOH=1:3. The mixed system was placed in an oil bath at 160° C., stirred, condensed and refluxed for activation reaction for 5 hours.

[0041] (2) Aging

[0042] SiO in the activated system 2 and Al 2 o 3 The content is SiO in potassium feldspar 2 and Al 2 o 3 content, K 2 O content is K in potassium feldspar 2 The dissolved amount of O is converted into K from KOH 2 After O (the conversion formula is ) content. The activated system is according to the molar ratio of SiO 2 / Al 2 o 3 =12,K 2 O / SiO 2 =1.6,H 2 O / SiO 2 =51, add silicon source (white carbon black - that is, SiO 2 , (the...

Embodiment 2

[0050] (1) Activation and preparation

[0051] KOH (purity is 85%) 35.2943g, water 4.7ml join in the there-necked bottle and mix evenly, make initial alkali concentration namely KOH mass concentration be 75%, then join potassium feldspar ore powder 10.0006g in the there-necked bottle and mix with KOH and Mix the water evenly so that the mass ratio of mineral alkali to potassium feldspar:KOH=1:3. The mixed system was placed in an oil bath at 160° C., stirred, condensed and refluxed for activation reaction for 5 hours.

[0052] (2) Aging

[0053] The system after activation in (1) is according to the ratio of SiO 2 / Al 2 o 3 =12,K 2 O / SiO 2 =1.6,H 2 O / SiO 2 =51, add 3.3156g of silicon source (white carbon black), 0.0982g of aluminum hydroxide and 143.56ml of water, and stir evenly. The mixture was mechanically stirred at 25 °C for 3 h.

[0054] (3) Crystallization

[0055] Put the mixed solution obtained in step (2) into a closed crystallization kettle, and crystalliz...

Embodiment 3

[0061] (1) Activation and preparation

[0062] KOH (purity is 85%) 35.2943g, water 4.7ml join in the there-necked bottle and mix evenly, make initial alkali concentration namely KOH mass concentration be 75%, then join potassium feldspar ore powder 10.0004g in the there-necked bottle and mix with KOH and Mix the water evenly so that the mass ratio of mineral alkali to potassium feldspar:KOH=1:3. The mixed system was placed in an oil bath at 140° C., stirred, condensed and refluxed for activation reaction for 5 hours.

[0063] (2) Aging

[0064] The system after activation in (1) is according to the ratio of SiO 2 / Al 2 o 3 =12,K 2 O / SiO 2 =1.6,H 2 O / SiO 2 =51, add 3.3423g of silicon source (white carbon black), 0.1370g of aluminum hydroxide and 143.54ml of water, and stir evenly. The mixture was mechanically stirred at 25 °C for 3 h.

[0065] (3) Crystallization

[0066] Put the mixed solution obtained in step (2) into a closed crystallization kettle, and crystalliz...

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Abstract

The invention discloses a method for preparing a total potassium W type molecular sieve by activating potassium feldspar via KOH sub-molten salt. The method comprises the following steps of uniformly mixing KOH, potassium feldspar and water in a reactor and then placing in an oil bath pan at 140-175 DEG C to carry out reaction for 5-8h; replenishing one or several of Al(OH)3, white carbon black and water to the activated system to ensure that the components in the solution accord with the mole ratios that SiO2: Al2O3=(5-20): 1, K2O / SiO2=1-3.0. and H2O: SiO2=(40-120): 1; ageing at 25-70 DEG C for 2-15h; and crystallizing at 90-180 DEG C for 8-72h and then washing and drying the filter cake to obtain a solid product W type molecular sieve. According to the method, the problem that the potassium feldspar is high in activation temperature, large in energy consumption and complicated in operation, the W type molecular sieve with high application value is obtained and the cyclic utilization of the mother liquor is realized.

Description

technical field [0001] The invention relates to a method for producing full potassium W-type molecular sieve by activating potassium feldspar with KOH sub-molten salt. At the same time, the mother liquor in the crystallization process is recovered and recycled, and the product molecular sieve can be used as an ion exchanger, an adsorbent and a slow-release potassium fertilizer. Background technique [0002] Potassium is one of the macroelements necessary for the growth of crops, and insoluble potassium resources cannot be absorbed and utilized by plants. In recent years, the area of ​​potassium-deficient cultivated land in my country has been increasing day by day. Due to economic and technical reasons, a large amount of potassium fertilizer needs to be imported every year. my country's water-soluble potassium resources are seriously lacking, while the reserves of insoluble potassium resources represented by potassium feldspar are extremely rich. Therefore, it is of great s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02
Inventor 曹吉林刘爽赵斌白艳张广林
Owner HEBEI UNIV OF TECH
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