Method for removing potassium nitrate impurity ions on line in chemical tempering production

A technology of chemical tempering and impurity ions is applied in the field of potassium nitrate treatment, which can solve the problem of too fast replacement frequency of potassium nitrate, and achieve the effects of improving machine utilization rate and production capacity, simple steps and operations, and avoiding stress and poor strength products.

Active Publication Date: 2012-06-27
GUANGDONG AVIC SPECIAL GLASS TECH
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Problems solved by technology

[0009] In order to reduce the cost and solve the problem of too fast replacement frequency of potassium nitrate in chemical tempering production, the present invention proposes a method for removing impurity ions in potassium nitrate on-line in chemical tempering production. I

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  • Method for removing potassium nitrate impurity ions on line in chemical tempering production
  • Method for removing potassium nitrate impurity ions on line in chemical tempering production
  • Method for removing potassium nitrate impurity ions on line in chemical tempering production

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Example Embodiment

[0037] Example 1:

[0038] Put a certain amount of industrial grade haifa brand potassium nitrate (purity ≥99.4%) into the chemical tempering furnace, set the heating temperature at 350℃, and melt the potassium nitrate. The heating time depends on the amount of potassium nitrate added and the heating power. After being completely melted, set the temperature to the temperature required for chemical toughening production, such as 420°C, and keep it at a constant temperature for 48 hours. Then batch tempering production operation, the above process is the existing chemical tempering production process; in the production operation, samples of potassium nitrate are taken for sodium, calcium, and magnesium ion concentration detection, the frequency is one extraction for each batch operation, and the sodium ions, The concentration of calcium and magnesium ions. At the same time, each batch of chemically toughened products is also tested for stress and strength, and the test data is rec...

Example Embodiment

[0048] Example 2:

[0049] Take the analytical pure grade potassium nitrate as an example (purity ≥99.5%) instead of industrial pure potassium nitrate, and add it to the chemical tempering furnace. The steps refer to implementation case 1 for comparison.

[0050] In order to facilitate the comparison of strength and stress, the following experiments were done with reference to Example 1:

[0051] Similarly, ordinary float soda lime silica glass is used as the test glass. The 100*100*0.7mm test pieces are edged, cleaned and put into the chemical tempering furnace in batches. The quantity of each batch is more than 30 pieces, and the tempering temperature is 420℃. After 4 hours, chemically tempered and then soaked in water for cleaning, the stress was tested with the Orihara stress optical instrument, and the 3-point bending was tested with the universal material testing machine, and the bending strength at break was calculated, and the chemistry was sampled and tested. Potassium nitr...

Example Embodiment

[0061] Example 3:

[0062] Take another manufacturer's industrial grade potassium nitrate as an example (purity ≥99.0%) instead of haifa industrial pure potassium nitrate, and add it into the chemical tempering furnace. Refer to Example 1 for the operation steps for comparison.

[0063] In order to facilitate the comparison of strength and stress, the following experiments were carried out with reference to Example 1:

[0064] Similarly, ordinary float soda lime silica glass is used as the test glass. The 100*100*0.7mm test pieces are edged, cleaned and put into the chemical tempering furnace in batches. The quantity of each batch is more than 30 pieces, and the tempering temperature is 420℃. After 4 hours, chemically tempered and then soaked in water for cleaning, the stress was tested with the Orihara stress optical instrument, and the 3-point bending was tested with the universal material testing machine, and the bending strength at break was calculated, and the chemistry was samp...

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Abstract

The invention relates to a method for removing potassium nitrate impurity ions on line in chemical tempering production. The method implements the invention through the following steps in the mass chemical tempering operation: (1) the concentration of sodium, calcium and magnesium ions in molten potassium nitrate in a chemical tempering furnace is detected; when the glass stress and strength are lower than set values after a certain amount of chemical tempering, the tempering is stopped, and the concentration of the sodium, calcium and magnesium ions in the molten potassium nitrate in the furnace is recorded; (2) an appropriate amount of treated reagent (potassium pyroantimonate) is added in the potassium nitrate of which the tempering is stopped and simultaneously is stirred, so that the reaction is uniform and full; (3) the molten potassium nitrate obtained in the step (2) stands at constant temperature, so that the molten potassium nitrate reacts, is deposited and clarified thoroughly; and (4) after the molten potassium nitrate obtained in step (3) is fully clarified, the chemical tempering is re-started. The method can reduce the replacing frequency of the chemically tempered potassium nitrate, reduces the cost, improves the production efficiency, is simple in process and is convenient to implement.

Description

technical field [0001] The invention relates to potassium nitrate treatment technology for chemically toughened glass, and discloses a method for removing impurity ions in potassium nitrate on-line during chemical toughening production. Background technique [0002] Nowadays, more and more glass products use chemical tempering to improve the strength of glass. Especially when the thickness of the glass is less than 2mm and physical toughening is difficult to achieve, chemical toughening is generally used to improve the strength. The principle is to place the glass or glass products to be tempered in high-temperature molten potassium nitrate molten salt and soak for a certain period of time, through the replacement reaction between potassium ions in the potassium nitrate molten salt and sodium ions in the glass. Since the diameter of potassium ions is larger than that of sodium ions, Thereby forming compressive stress on the surface of the glass to achieve the purpose of...

Claims

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Application Information

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IPC IPC(8): C03B27/03
CPCY02P40/57
Inventor 吕皓鲁鹏何沁王洪鹃赵会峰崔永红周莉冯秀劳
Owner GUANGDONG AVIC SPECIAL GLASS TECH
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