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Method for preparing molecular sieve by utilizing potassium feldspar

A molecular sieve and potassium feldspar technology, applied in the field of molecular sieve preparation, can solve problems such as high process difficulty, poor product quality stability, and difficult to grasp the process

Active Publication Date: 2015-08-19
LUOYANG FLUORIDE & POTASSIUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there is a method of using alkali slag and potassium feldspar to make molecular sieves. Due to the multi-purpose fertilizer, the process is difficult to grasp and the product performance is not high; there is also a technology that improves the former, using soda ash or caustic soda, However, it still faces the problems of high process difficulty and poor product quality stability
If relatively pure industrial raw materials are directly used for large-scale molecular sieve production, it is obviously not economical

Method used

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  • Method for preparing molecular sieve by utilizing potassium feldspar

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 Shown, a kind of method utilizing potassium feldspar to produce molecular sieve, preparation process comprises the following steps:

[0027] Step 1: When the temperature of the converter reaches 350°C, mix 60Kg of potassium feldspar and NH 4 F (30-40) Kg is mixed evenly, and added to the converter silo in batches, and the mixing screw and star feeder are opened in turn to feed, potassium feldspar powder and NH 4 F reacts in the converter to form SiF 4 gas and containing Al 3+ 、K + and F - residue. Among them, before the reaction, potassium feldspar and NH 4 The mass ratio of F is 1:(0.4-0.6), the reaction temperature is 300°C-320°C, and the reaction time is 0.5-2 hours. After half an hour of reaction, the discharge screw is turned on, and the reacted slag is discharged from the furnace tail.

[0028] Step 2: When the temperature of the converter reaches 370°C, add fluorite powder, open the sulfuric acid feeding ball valve two minutes after the f...

Embodiment 2

[0037] The difference between Example 2 and Example 1 is that the purification in step 4 includes successive centrifugation and concentrated crystallization.

[0038] The centrifugal separation is in a three-leg centrifuge from Na 2 SiO 3 Part of the NaF crystal is separated from the solution, and then the separated NaF crystal is washed and dried to obtain a finished NaF crystal. The finished NaF crystal is an important raw material for industrial products, which improves the economic benefits generated by the decomposition of potassium feldspar.

[0039] The condensed crystal is obtained from the centrifuged Na 2 SiO 3 The NaF crystal crude product is separated from the solution. Since the concentrated and crystallized NaF crystal crude product is not as pure as the centrifuged NaF crystal finished product, the NaF crystal crude product is re-added to the product of step 3, and participates in step 4 again. ; Na through the concentrated crystallization 2 SiO 3 The solu...

Embodiment 3

[0041] The difference between embodiment 3 and embodiment 2 is that the product in step 1 also includes ammonia gas, which is absorbed by cold water to form ammonia water, which is used to participate in the reaction in step 6. After centrifugation, the NaF crystals washed in water contain NaF, which can be used to prepare NaOH solution, and the NaOH solution can be used to participate in the reactions of step 3 and step 7. It can be seen from the above two points that the present invention recycles waste gas and waste water, participates in the production process, and improves the utilization rate of products in the potassium feldspar decomposition process while saving energy and reducing emissions.

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Abstract

The invention provides a method for preparing molecular sieve by using potassium feldspar, which utilizes SiF4 gas obtained by low-temperature decomposition of potassium feldspar and NH4F, and converts it into Na2SiO3 and NaF in NaOH solution; To the leaching solution containing K+, Al3+, SO42-, ammonia gas can be passed through the leaching solution to obtain Al(OH)3 precipitation and agricultural compound fertilizer ammonium potassium sulfate. NaAlO2 can be obtained by treating Al(OH)3 with NaOH, and molecular sieves can be synthesized by NaAlO2 and Na2SiO3 under hydrothermal conditions. The invention prepares molecular sieves with adjustable silicon-aluminum ratio and crystal form, and co-produces agricultural fertilizer potassium ammonium sulfate and industrial sodium fluoride, realizes comprehensive utilization of three elements of potassium feldspar K, Al and Si, and has remarkable economic benefits .

Description

technical field [0001] The invention relates to a method for preparing molecular sieves, in particular to a method for preparing molecular sieves from potassium feldspar in industrial production. Background technique [0002] Molecular sieve, also known as zeolite, is a crystalline aluminosilicate. Due to the limitation of natural resources, almost all of them are artificially synthesized now. The silicon source and aluminum source used in the synthesis of molecular sieves determine the quality of the process, product performance and economy. Potassium feldspar provides silicon and aluminum resources at the same time, so it is obviously a good choice to develop and utilize potassium feldspar to produce molecular sieves. In the prior art, there is a method of using alkali slag and potassium feldspar to make molecular sieves. Due to the multi-purpose fertilizer, the process is difficult to grasp and the product performance is not high; there is also a technology that improves...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02C01D3/02C01D5/00C05C3/00
Inventor 张光旭石瑞彭宇任晓聪张鲁鲁崔文青
Owner LUOYANG FLUORIDE & POTASSIUM TECH
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