Method for recycling waste potassium nitrate generated in glass toughening into potassium nitrate reagent

A waste potassium nitrate and glass tempering technology, which is applied in the purification of alkali metal nitrate, etc., can solve the problems of secondary environmental pollution, low added value, and affecting product purity.

Inactive Publication Date: 2015-03-25
CHANGSHA XINBEN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's current annual consumption and production of waste potassium nitrate have reached more than 30,000 tons. At present, general manufacturers only crush and recrystallize waste potassium nitrate to remove mechanical impurities and then sell it as agricultural potassium nitrate. The added value is low.
At the same time, because the impurity ions and organic impurities in the waste potassium nitrate are not treated, they are directly brought into the product, which not only affects the purity of the product, but also may cause secondary pollution to the environment during the use of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Put 1500Kg of crushed waste potassium nitrate into an enamel dissolving kettle containing 1000Kg of deionized water, stir, and raise the temperature to 80-100°C until the potassium nitrate is completely dissolved;

[0017] 2) Detect NO2 in the solution in step 1 - The concentration is 0.03%, add 0.9Kg reagent NH 4 NO 3 , React for 1 hour, detect NH in the solution 4 + It is 8ppm. Then add reagent nitric acid, adjust the pH of the solution to 6.2, keep it for 1 hour;

[0018] 3) Open the bottom valve of the dissolving tank, and filter the solution in step 2 with a membrane filter to remove mechanical impurities;

[0019] 4) Put the solution of step 3 into an enamel crystallization kettle, and cool and crystallize to 25-30°C;

[0020] 5) Put the solution in step 4 into a centrifuge and wash it twice with a small amount of deionized water to obtain crude potassium nitrate; at the same time, obtain the centrifuged mother liquor and the washing liquid after centrifugation, and ke...

Embodiment 2

[0027] 1) Send the mother liquor and washing water prepared in Example 1 to the dissolving kettle after passing through the adsorption tower equipped with DXA-1 resin;

[0028] 2) Put 1200Kg of crushed waste potassium nitrate into an enamel dissolving kettle filled with 1000Kg mother liquor and washing water, stir, and raise the temperature to 80-100°C until the potassium nitrate is completely dissolved;

[0029] 3) Detect NO2 in the solution in step 1 - The concentration is 0.05%, add 2.3Kg reagent NH 4 NO 3 , React for 1.5 hours, detect NH in the solution 4 + It is 6ppm. Then add reagent nitric acid, adjust the pH of the solution to 6.5, and keep it warm for 0.5 hours;

[0030] 4) Open the bottom valve of the dissolving tank, and filter the solution in step 2 with a membrane filter to remove mechanical impurities;

[0031] 5) Put the solution of step 3 into an enamel crystallizer, and cool and crystallize to 25-30°C;

[0032] 6) Put the solution in step 4 into a centrifuge for centri...

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PUM

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Abstract

The invention discloses a method for recycling waste potassium nitrate generated in glass toughening into a potassium nitrate reagent. The method comprises the following steps: (1) crushing waste potassium nitrate generated in chemical toughening of glass into small pieces, adding into a solvent, and heating to 80-100 DEG C to completely dissolve the waste potassium nitrate to obtain a waste potassium nitrate solution; (2) adding ammonium salt into the waste potassium nitrate solution to ensure that the mole ratio of NH<4+> to NO<2-> in the waste potassium nitrate solution is (1-1.05):1, reacting for 1-2 hours, detecting the concentration of NH<4+> ions in the solution, and regulating the pH value to be 5-7 by adding a nitric acid reagent when the concentration of the NH<4+> ions is smaller than 10ppm so as to transform potassium hydroxide and potassium carbonate in the solution into potassium nitrate; keeping the temperature for 0.5-1 hour; filtering, cooling and crystalizing to obtain a crystal product; and (3) centrifuging, washing and drying the crystal product to obtain the potassium nitrate reagent, retaining and storing a centrifuged mother liquid obtained after centrifugation and a washing liquid obtained after washing.

Description

Technical field [0001] The invention belongs to the technical field of chemistry and chemical engineering, and in particular relates to a method for recovering glass tempered waste potassium nitrate into reagent potassium nitrate. technical background [0002] Potassium nitrate with potassium nitrate purity of 99.6% or more for glass chemical tempering requires sodium ion concentration to be less than 200ppm, calcium ion, magnesium ion, and iron ion concentration to be less than 10ppm, and a small amount of catalyst is added during use. The current market price is 10,000 to 18,000 yuan / ton, and potassium nitrate imported from Israel reaches more than 20,000 yuan / ton. With the continuous development of the electronics industry, the amount of toughened glass screens continues to increase. Chemical tempering is a process in which potassium ions in molten potassium nitrate replace sodium ions in glass. Therefore, with the continuous progress of tempering, sodium ions in molten salt ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D9/16
CPCC01D9/16
Inventor 刘建曹灵峰
Owner CHANGSHA XINBEN CHEM
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