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Recycling method of toughened waste glass

A technology of glass and waste products, which is applied in the field of recycling and reuse of waste glass, which can solve the problems of size error and troublesome recycling and reuse, and achieve the effect of accurate and controllable size error

Pending Publication Date: 2018-05-25
LENS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the size of the glass obtained by this method has a certain degree of error after secondary strengthening, so the glass obtained by "changing materials and reprocessing" still brings a lot of trouble to its recycling and reuse.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment provides a method for recycling and reusing strengthened waste glass. The method specifically includes the following steps:

[0022] S1: Preheating, the preheating temperature is 390±30℃, the time is more than 3 hours, and the atmosphere is air. In mass production (recycling multiple pieces of waste glass at the same time), when the preheating temperature is lower than a certain temperature, the glass workpiece will enter the ion exchange step after the preheating step is completed, and the ion exchange molten salt temperature will drop by 10°C About, after the ion exchange is completed, the surface of the workpiece will be broken due to the low ion exchange temperature; when the preheating temperature is higher than a certain temperature, the strengthened workpiece holder may locally react with the workpiece, resulting in adverse consequences. In the present invention, if the preheating time is too short, the temperature of the workpiece inside the ion ex...

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Abstract

The invention provides a recycling method of toughened waste glass. The recycling method comprises the following steps: A, preheating; B, ion exchange of mixed molten salt: the preheated glass is subjected to ion exchange by the mixed molten salt consisting of lithium nitrate and sodium nitrate for 4 hours or longer at 380-480 DEG C; C, water cleaning: molten salt of lithium nitrate and sodium nitrate on the surface of the glass after ion exchange is removed by water washing; D, annealing at high temperature; E, re-toughening: chemical toughening is performed on the annealed glass again aftersecondary processing and / or cutting, and a recycled glass product is obtained. According to the recycling method, surface stress of the glass toughened primarily can be eliminated by the aid of the ion exchange action of sodium nitrate and lithium nitrate in the mixed molten salt, so that the glass annealed at high temperature can be directly processed secondarily and / or cut without cracking, andthe size of the expanded glass after original high-temperature annealing and re-toughening is effectively controlled.

Description

Technical field [0001] The invention relates to the field of glass processing, in particular to a method for recycling and reusing strengthened waste glass. Background technique [0002] Chemically strengthened glass is widely used in electronic fields such as mobile phones, watches, computers, touch panels, etc. As the appearance requirements of glass products are becoming stricter, the number of glass cracking waste after strengthening is gradually increasing. If these waste glass are directly scrapped, the Serious waste of resources and production costs. However, if you consider the reuse or secondary processing of these waste glass, there will be residual stress on the surface of the strengthened glass product, and cracks will appear at the lower knife point of the product during the cutting process, resulting in glass product cracks. In other words, the strengthened glass product cannot be cut directly, and cannot be directly changed from large pieces to small pieces. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C21/00
CPCC03C21/002
Inventor 周群飞饶桥兵王天碧
Owner LENS TECH
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