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Method and additive capable of accelerating clarification and impurity removal of molten potassium nitrate solution

A technology of potassium nitrate and additives, applied in the direction of alkali metal nitrate purification, etc., can solve the problems of reducing the glass tempering effect and surface quality, increasing the cost of tempering, prolonging the clarifying time, etc., so as to shorten the clarifying time, speed up the clarifying, and improve the tempering effect. Effect

Active Publication Date: 2015-09-16
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the clarification time of potassium nitrate molten salt is not enough, the ammonium ions in it will not be completely volatilized, which will cause corrosion of the glass and reduce the tempering effect and surface quality of the glass.
If the clarification time is extended, the tempering cost will be greatly increased

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Select 100 parts by weight of industrial-grade first-class potassium nitrate salt with a purity of 99.7%. After the melting of potassium nitrate, add 1.5 parts by weight of potassium carbonate and 0.5 parts by weight of antimony trioxide and stir for 20 minutes; then add 0.2 parts by weight of silicon dioxide (phase α) and 0.2 parts by weight of aluminum oxide (phase β), and stir After uniformity, keep it warm at 460°C for 10 hours; use soda-lime-silica glass to temper at this temperature for 4 hours. After the tempering is completed, the surface stress of the glass is 511.2±7.0MPa, and the depth of the stress layer is 17.3±0.3μm, meeting the product requirements CSB-II-A specified in the JC / T977-2005 standard.

Embodiment 2

[0024] Select 100 parts by weight of industrial-grade first-class potassium nitrate salt with a purity of 99.7%. After the melting of potassium nitrate, add 1.5 parts by weight of potassium carbonate and 1.0 parts by weight of antimony trioxide and stir for 20 minutes; After homogeneity, keep it warm at 440°C for 10 hours; use soda-lime-silica glass to temper at this temperature for 4 hours. After the tempering is completed, the surface stress of the glass is 646.1±7.4MPa, and the depth of the stress layer is 12.4±0.1μm, meeting the product requirements CSB-III-A specified in the JC / T977-2005 standard.

Embodiment 3

[0026] Get 100 parts by weight of industrial-grade first-class potassium nitrate salt with a purity of 99.7%. After the melting of potassium nitrate, add 3 parts by weight of potassium carbonate and 2 parts by weight of antimony trioxide and stir for 20 minutes; then add 1 part by weight of silicon dioxide (phase α) and 1 part by weight of aluminum oxide (phase β), and stir After homogeneity, keep it warm at 450°C for 10 hours; use soda-lime-silica glass to temper at this temperature for 4 hours. After the tempering is completed, the surface stress of the glass is 586.7±6.2MPa, and the depth of the stress layer is 14.7±0.3μm, meeting the product requirements CSB-II-A specified in the JC / T977-2005 standard.

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Abstract

The invention provides a method capable of accelerating clarification and impurity removal of a molten potassium nitrate solution. The method comprises the following steps: 1) selecting potassium nitrate, potassium carbonate, alpha-phase silica, beta-phase alumina and antimonous oxide; 2) heating potassium nitrate to a temperature above melting temperature so as to melt potassium nitrate; 3) adding potassium carbonate and antimonous oxide into the fused potassium nitrate molten salt and carrying out stirring; 4) adding alpha-phase silica and beta-phase alumina into the molten salt prepared in the step 3) and carrying out stirring; and 5) subjecting the molten salt to heat preservation and standing for more than 10 hours, wherein tempering can be carried out upon clarification of the solution. The additive provided by the invention can rapidly remove harmful impurities in sylvite, effectively shortens clarification time of the potassium nitrate molten salt, reduces the ion concentrations of harmful impurities in the potassium nitrate molten salt, improves surface stress, stress layer depth and bending strength of chemically-toughened glass and lowers production cost.

Description

technical field [0001] The invention relates to an additive, in particular to a method capable of accelerating the clarification and impurity removal of potassium nitrate melt and the additive. Background technique [0002] Chemical tempering (also known as ion exchange) can effectively increase the surface stress and bending strength of glass, and is one of the effective strengthening methods for thin glass and its products. In order to reduce the cost of chemical tempering, potassium nitrate of industrial grade purity is usually used. Potassium nitrate of industrial grade purity usually has more useless components and harmful impurity ions that reduce the effect of chemical toughening, such as ammonium ions, calcium ions, magnesium ions, etc. Industrial-grade potassium nitrate is mostly produced by ammonium nitrate conversion method, so potassium nitrate salt usually contains more ammonium ions. If the clarification time of potassium nitrate molten salt is not enough, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D9/16
Inventor 刘超李晨蕊赵修建韩建军谢俊吕在国吕鑫张金奎蒋葵玲
Owner WUHAN UNIV OF TECH
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