Method for purifying potassium nitrate from waste potassium nitrate obtained from chemical toughened glass production

A chemical toughened glass and potassium nitrate technology, applied in the field of potassium nitrate purification, can solve the problems of increased energy consumption, high purification cost, high process conditions, etc., and achieve low production costs, improved raw material purity, and simple process conditions.

Pending Publication Date: 2022-05-20
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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  • Abstract
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Problems solved by technology

[0004] CN104310444A discloses a method for extracting potassium nitrate from waste potassium nitrate raw materials produced by chemically toughened glass, 1) placing waste potassium nitrate in a reaction device and heating to form a molten liquid; 2) adding purified potassium nitrate to the molten solution 3) Add water after cooling the clarified liquid, and then heat to fully dissolve it into a semi-finished solution; 4) Put the semi-finished solution in a cooling device for cooling crystallization, filtration, and recrystallization , to obtain potassium nitrate product by drying; the invention adopts the method of heating, cooling and recrystallization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Pulverize the waste potassium nitrate until the particle size is 1mm to obtain raw material A;

[0039] (2) At room temperature, add deionized water to raw material A, the mass ratio of deionized water to raw material A is 2.5:1, stir for 0.5h, and obtain potassium nitrate mixed solution B;

[0040] (3) Add raw material A repeatedly to potassium nitrate mixed solution B, wherein the mass ratio of raw material A to potassium nitrate mixed solution B is 2.13:1, stir for 1 hour, filter, repeat 8 times; combine the solid parts obtained by each filtration, Obtain filtrate C and semi-finished potassium nitrate salt;

[0041] (4) Heat filtrate C to 75°C, add raw material A repeatedly, wherein, the mass ratio of raw material A to filtrate C is 2.33:1, stir for 1 h, filter, repeat 3 times; combine the solid parts obtained by each filtration to obtain Filtrate D and semi-finished potassium nitrate salt;

[0042] (5) drying the semi-finished potassium nitrate salt obtained i...

Embodiment 2

[0047] (1) Pulverize the waste potassium nitrate until the particle size is 3mm to obtain raw material A;

[0048](2) At room temperature, add deionized water to raw material A, the mass ratio of deionized water to raw material A is 2.6:1, stir for 0.5h, and obtain potassium nitrate mixed solution B;

[0049] (3) Add raw material A repeatedly to potassium nitrate mixed solution B, wherein the mass ratio of raw material A to potassium nitrate mixed solution B is 1.76:1, stir for 1 hour, filter, and repeat 10 times; combine the solid parts obtained by each filtration, Obtain filtrate C and semi-finished potassium nitrate salt;

[0050] (4) Heat filtrate C to 85°C, add raw material A repeatedly, wherein the mass ratio of raw material A to filtrate C is 1.79:1, stir for 1 h, filter, repeat 5 times; combine the solid parts obtained by each filtration to obtain Filtrate D and semi-finished potassium nitrate salt;

[0051] (5) drying the semi-finished potassium nitrate salt obtaine...

Embodiment 3

[0056] (1) Pulverize waste potassium nitrate until the particle size is 5mm to obtain raw material A;

[0057] (2) At room temperature, add deionized water to raw material A, the mass ratio of deionized water to raw material A is 2.8:1, stir for 0.5h, and obtain potassium nitrate mixed solution B;

[0058] (3) Repeatedly add raw material A to potassium nitrate mixed solution B, wherein, the mass ratio of raw material A to potassium nitrate mixed solution B is 1.42:1, stir for 1.5h, filter, repeat 12 times; combine the solid parts obtained by each filtration , obtain filtrate C and semi-finished potassium nitrate salt;

[0059] (4) Heat filtrate C to 100°C, add raw material A repeatedly, wherein, the mass ratio of raw material A to filtrate C is 2.36:1, stir for 1.5h, filter, repeat 6 times; combine the solid parts obtained by each filtration, Obtain filtrate D and semi-finished potassium nitrate salt;

[0060] (5) drying the semi-finished potassium nitrate salt obtained in s...

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Abstract

The invention discloses a method for purifying potassium nitrate from waste potassium nitrate obtained by chemical toughened glass production. The method comprises the following steps: crushing waste potassium nitrate to obtain a raw material A; adding water into the raw material A, and stirring to obtain a potassium nitrate mixed solution B; repeatedly adding the raw material A into the potassium nitrate mixed solution B, stirring and filtering to obtain filtrate C and a semi-finished product potassium nitrate salt; heating the filtrate C, repeatedly adding the raw material A again, stirring and filtering to obtain filtrate D and a semi-finished product potassium nitrate salt; adding water into the filtrate D, cooling to normal temperature, stirring and filtering to obtain a semi-finished product potassium nitrate salt and filtrate E; and drying the obtained semi-finished product potassium nitrate salt, and removing ash in the semi-finished product potassium nitrate salt to obtain an industrial potassium nitrate product. The method can obtain a high-purity potassium nitrate product, and is high in potassium nitrate recovery rate, simple in process condition, energy-saving, environment-friendly and low in production cost.

Description

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Claims

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Application Information

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Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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