Foam glass produced by lens glass waste material and its preparing method

A technology for glass waste and foam glass, which is applied in the removal of solid waste and other directions, can solve the problems of lens glass corner waste, difficult to achieve optical stability of glasses glass, etc., and achieves the effects of wide application, light weight and good structural strength.

Inactive Publication Date: 2005-03-02
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to remelt the scraps left over from cutting lenses, because it is difficult to achieve the optical stability required by spectacle glasses, which produces a large amount of scrap glass scraps

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Clean the discarded spectacle glass scraps, perform simple crushing, the particle size is less than 20mm, and then mix according to 97.45wt% of lens glass scraps, 0.25wt% of carbon black, 2.0wt% of boric acid, and 0.3wt% of antimony trioxide, and put them into a ball mill for grinding into a powder of less than 80 microns, put the batch material into a heat-resistant steel mold to flatten, and then cover a layer of 1mm thick heat-resistant steel insulation plate, in order to prevent the carbon black in the batch material from reacting with the oxygen in the furnace prematurely.

[0024] Send the mold with the batch materials into the tunnel kiln, roller kiln or pusher kiln for heating and foaming, keep warm at 860-890°C for 30-60 minutes to make the batch materials foam, then cool to 600, keep 0.5 Hours, then remove the metal mold, put it into the annealing furnace, keep the temperature at 530-560°C, and keep it at this temperature for 2 hours, then lower the temperature...

Embodiment 2

[0026] Except that formula and foam glass technical parameters are different from embodiment 1, other technical links are the same. The formula of batching materials is as follows: 96.1wt% of lens glass scraps, 0.5wt% of carbon black, 3.0wt% of boric acid, and 0.4wt% of antimony trioxide. The structure and performance of the foam glass produced are: the bubble structure of the foam glass is uniform, and the density reaches 128kg / m 3 , the water absorption rate is less than 0.39vol%, the compressive and flexural strength reaches 0.68Mpa, and the flexural strength reaches 0.56Mpa. The thermal conductivity is 0.044w / (m.k).

Embodiment 3

[0028] Except that formula and foam glass technical parameters are different from embodiment 1, other technical links are the same. The batching material formula is: 98.6wt% of lens glass scraps, 0.2wt% of carbon black, 1.0wt% of boric acid, and 0.2wt% of antimony trioxide. The structure and performance of the foam glass produced are: the bubble structure of the foam glass is uniform, and the density reaches 139g / m 3 , the water absorption rate is less than 0.39vol%, the compressive and flexural strength reaches 0.75Mpa, and the flexural strength reaches 0.65Mpa. Thermal conductivity 0.050w / (m.k).

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Abstract

The present invention produces foamed glass with the leftover from producing glasses lens in 96.1-98.6 wt%, boric acid 1.0-3.0 wt%, Sb2O3 as assistant 0.2-0.4 wt% and common carbon black as foaming agent 0.2-0.5 wt%, and through ball milling to form compounded material, grinding to finer than 80 micron, spreading in refractory steel mold, covering with isolating refractory steel plate and forming in common technological process to obtain the foamed glass with homogeneous structure. The foamed glass has density of 130 kg / cu m, water absorption less than 0.5 vol%, compression strength and folding strength higher than 0.6 MPa and heat conducting coefficient of 0.046-0.052 w / (m.k). It is one excellent kind of heat insulating material, and may be used widely in petroleum industry, tunnel engineering, outer building wall, etc.

Description

technical field [0001] Foam glass produced from lens glass waste and its preparation process belong to the technical field of foam glass preparation. Background technique [0002] Spectacle glass is mainly used for vision correction. It absorbs ultraviolet light and infrared light, has a stable refractive index, and has good hardness, wear resistance and chemical stability. [0003] The chemical composition range of spectacle glass used in foam glass is SiO 2 70~75wt%, CaO 3~7wt%, Na 2 O 12~18wt%, and SiO 2 60-65wt%, BaO(ZnO) 14-16wt% system. [0004] Spectacle glass is an optical glass material, which has high requirements on raw material purity and melting quality. It is difficult to remelt and rebuild the scrap left over from cutting the lens, because it is difficult to achieve the optical stability required by the spectacle glass, so a large amount of scrap glass is produced. [0005] Because a large number of discarded spectacle glass scraps provide a raw materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C03C11/00
CPCC03C11/007
Inventor 田英良孙诗兵刘萍张继光邹玉林黄幼榕
Owner BEIJING UNIV OF TECH
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