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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. In the chemical tempering furnace, under the molten state of potassium nitrate, The potassium nitrate in use is specially treated with impurity ions to make it precipitate, so that the treated potassium nitrate is close to the chemical toughening effect of new potassium nitrate

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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

Examples

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Embodiment 1

[0038] Add a certain amount of industrial-grade haifa brand potassium nitrate (purity ≥ 99.4%) into the chemical tempering furnace, set the heating temperature at 350°C, and melt the potassium nitrate. The heating time depends on the amount of potassium nitrate added and the heating power. After complete melting, set the temperature at 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 operations, the above-mentioned process is the existing chemical tempering production process; during the production operation, potassium nitrate samples are taken to detect the concentration of sodium, calcium, and magnesium ions, and the frequency is once for each batch of operations. Concentrations of calcium and magnesium ions. At the same time, each batch of chemically tempered products is also tested for stress and strength, and the test data is recorded. When the stress value is l...

Embodiment 2

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

[0050] For the convenience of comparative strength and stress, the following experiments were done respectively with reference to Example 1:

[0051] Ordinary float soda-lime-silicate glass is also used as the test glass, and the 100*100*0.7mm test pieces are ground and cleaned, and put into the chemical tempering furnace in batches. Time 4 hours, after chemical tempering, soak in water and clean, use ORIHARA (ORIHARA) stress optics to test its stress, use a universal material testing machine to test 3-point bending, calculate its bending strength when it breaks, and take samples to test Record chemical Potassium nitrate contains the concentration of sodium ions, calcium ions and magnesium ions during tempering. For the purpose of comparison, th...

Embodiment 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. The operation steps refer to Example 1 for comparison.

[0063] For the convenience of comparative strength and stress, the following experiments were done respectively with reference to Example 1:

[0064] Ordinary float soda-lime-silicate glass is also used as the test glass, and the 100*100*0.7mm test pieces are ground and cleaned, and put into the chemical tempering furnace in batches. Time 4 hours, after chemical tempering, soak in water and clean, use ORIHARA (ORIHARA) stress optics to test its stress, use a universal material testing machine to test 3-point bending, calculate its bending strength when it breaks, and take samples to test Record chemical Potassium nitrate contains sodium ion concentration during tempering. For the purpose of comparison, the chemical temperi...

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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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