Foaming agent used for process of making foamed glass from CRT screen glass

Abstract

The invention provides a foaming agent used for a process of making foamed glass from CRT screen glass. The foaming agent comprises Sb2O3 and an oxidizing agent. The oxidizing agent is nitrate. The main reaction mechanism is: Sb2O3+2[O] to Sb2O5 to Sb2O3+O2, wherein the Sb2O3+2[O] to Sb2O5 is low temperature section reaction, and the reaction temperature is below 600DEG C; the Sb2O5 to Sb2O3+O2 is high temperature section reaction, and the reaction temperature is over 700DEG C, the nitrate is one of sodium nitrate, potassium nitrate, magnesium nitrate and calcium nitrate, or a mixture of multiple components. For the foaming agent, Sb2O3 and the nitrate are in a mass ratio of 7:1-5:1, and mass of the foaming agent added during production accounts for 0.05-0.4% of the total raw material mass. The foaming agent provided by the invention can generate evenly distributed bubbles with similar volume sizes in the glass matrix generating, and has great help for improving the mechanical, temperature and optical properties of foamed glass.

Description

technical field [0001] The invention relates to the field of glass manufacturing, in particular to a foaming agent in the process of using CRT screen glass to manufacture foamed glass. Background technique [0002] From monitors that use cathode ray tubes, CRTs account for about 2 / 3 of the total mass of a computer or television. Glass accounts for 85% of the total mass of CRT, mainly including screen glass, cone glass and neck glass. With the development of science and technology, liquid crystal displays are gradually replacing CRT displays, and the amount of discarded CRTs is also increasing year by year. As a big country in the production and consumption of household appliances, my country has entered a peak period of scrapping CRT displays. It is predicted that they will be eliminated every year. The volume will reach more than 5 million units. [0003] CRT glass contains a variety of toxic and harmful substances, and direct landfilling will pollute soil and water with h...

AI Technical Summary

Problems solved by technology

[0003] CRT glass contains a variety of toxic and harmful substances, direct landfill will pollute soil and water with lead, cadmium and other heavy metals

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