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Method for purification of potassium nitrate in toughened glass waste liquid

A technology of tempered glass and potassium nitrate, applied in the direction of alkali metal nitrate purification, etc., can solve problems such as uneconomical, unenvironmental protection, unfavorable exchange process, etc., and achieve the effect of reducing purification cost

Active Publication Date: 2017-11-03
DONGXU OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the molten salt is used for a long time, it will inevitably appear a variety of impurity ions, which are very unfavorable to the exchange process, such as sodium nitrate, calcium ions, magnesium ions, barium ions and strontium ions, etc. The appearance of these ions will affect the exchange effect. result in negative effect
Usually, the higher the purity, the more such divalent ions will appear in the molten salt, and their existence will reduce the mechanical strength of the finished product
Therefore, it is necessary to replace the new tempering fluid after a period of chemical tempering of glass, but it is neither economical nor environmentally friendly to replace the new tempering fluid

Method used

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  • Method for purification of potassium nitrate in toughened glass waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Cool the tempered glass waste liquid containing potassium nitrate (concentration is 60% by weight) to room temperature, weigh 90g, add 600ml deionized water, stir at room temperature for 6h to fully dissolve, and filter to obtain solid impurity removed solution.

[0054] (2) Add 10 g of potassium carbonate and 10 g of potassium sulfate to 80 g of the solution, stir at 60° C. for 6 h to fully dissolve, and then perform solid-liquid separation.

[0055] The total content of calcium, magnesium, barium and strontium elements in the solution measured by an ICP spectrometer was 0.13% by weight.

[0056] Repeat the operation, add potassium carbonate, potassium sulfate and carry out solid-liquid separation, and measure the total content of calcium, magnesium, barium and strontium elements in the solution according to the aforementioned method to be 0.09% by weight.

[0057] Repeat the operation again, add potassium carbonate, potassium sulfate and carry out solid-liquid se...

Embodiment 2

[0072] (1) Cool the tempered glass waste liquid containing potassium nitrate (concentration is 95% by weight) to room temperature, weigh 80g, add 500ml deionized water, stir at room temperature for 5h to fully dissolve, and filter to obtain solid impurity removed solution.

[0073] (2) Add 8 g of potassium carbonate and 8 g of potassium sulfate to 70 g of the solution, stir at 50° C. for 5 h to fully dissolve, and then perform solid-liquid separation.

[0074] Repeat operation, add potassium carbonate, potassium sulfate and carry out solid-liquid separation altogether 5 times, record the total content of calcium, magnesium, barium and strontium element in the described solution according to the method of embodiment 1 and be 0.009% by weight, obtain clear solution .

[0075] (3) The clarified solution is fully contacted with the zeolite molecular sieve at a temperature of 60° C., and then impurities are removed.

[0076] The operation was repeated, and ion exchange and filtra...

Embodiment 3

[0082] (1) Cool the tempered glass waste liquid containing potassium nitrate (concentration is 75% by weight) to room temperature, weigh 70g, add 100ml deionized water, stir at room temperature for 5h to fully dissolve, and filter to obtain solid impurity removed solution.

[0083] (2) 60 g of the solution was added with 6 g of potassium carbonate and 6 g of potassium sulfate, stirred at 70° C. for 5 h to fully dissolve, and then separated into solid and liquid.

[0084] Repeat operation, add potassium carbonate, potassium sulfate and carry out solid-liquid separation altogether 4 times, record the total content of calcium, magnesium, barium and strontium element in the described solution according to the method of embodiment 1 and be 0.013% by weight, obtain clear solution .

[0085] (3) The clarified solution is fully contacted with the zeolite molecular sieve at a temperature of 50° C., and then impurities are removed.

[0086] The operation was repeated, and ion exchange...

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Abstract

Relating to the field of purification of toughened glass waste liquid, the invention discloses a method for purification of potassium nitrate in toughened glass waste liquid. The method includes the steps of: (1) cooling toughened glass waste liquid containing potassium nitrate, then adding water for dissolving, and conducting filtering to obtain a solid impurity removed solution; (2) carrying out adding of potassium carbonate and potassium sulfate and solid-liquid separation repeatedly on the solution to obtain a clarified solution; (3) conducting ion exchange and filtration for impurity removal on the clarified solution repeatedly to obtain an impurity removed solution; (4) adding an HCl solution into the impurity removed solution, and performing centrifugal separation to obtain a potassium nitrate-containing solution; and (5) carrying out aftertreatment on the potassium nitrate-containing solution to obtain purified potassium nitrate powder. The method provided by the invention can effectively remove solid impurities, Ca<2+>, Mg<2+>, Ba<2+>, Sr<2+> and the like from the toughened waste liquid, also can fully convert NaNO3 in the solution into KNO3 and enable reuse of the toughened waste liquid, and has the advantages of cost saving and environmental friendliness.

Description

technical field [0001] The invention relates to the field of purification of tempered glass waste liquid, in particular to a method for purifying potassium nitrate in tempered glass waste liquid. Background technique [0002] The purity of the molten salt in the chemical tempering method is very important in the entire ion exchange process, and has the greatest impact on the ion exchange. Generally speaking, under the same time conditions, the higher the purity of the molten salt, the better the ion exchange effect. Well, the mechanical strength of tempered glass is also greater. However, after the molten salt is used for a long time, it will inevitably appear a variety of impurity ions, which are very unfavorable to the exchange process, such as sodium nitrate, calcium ions, magnesium ions, barium ions and strontium ions, etc. The appearance of these ions will affect the exchange effect. have negative impacts. Usually, the higher the purity of the molten salt, the more su...

Claims

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Application Information

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IPC IPC(8): C01D9/16C03C21/00
CPCC01D9/16C03C21/002
Inventor 李俊锋张广涛闫冬成王丽红郑权
Owner DONGXU OPTOELECTRONICS TECH CO LTD
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