Process for smelting opal glass base material capable of preventing fluorin volatilization

Abstract

The invention discloses a process for smelting an opal glass base material capable of preventing fluorin volatilization. The process comprises the following steps: adding room-temperature opal glass base material to a certain height from the top of a furnace and then adopting an electrode to heat the base material to a smelting required temperature of 1,400 to 1,500 DEG C inside the lower part of the furnace, thereby realizing high-temperature liquefaction of the basic material at the bottom of the furnace to form a liquefaction layer; forming a solid layer by the upmost material and a semi-melting layer between the solid layer and a liquefied material area; under the pressure of the materials, outputting the liquefied basic material through a sealed discharge port at the lower part of the furnace for further use; during heating, continuously and evenly adding room-temperature basic material in the upper part of the furnace to keep the thickness of the material solid layer inside the furnace at 30 to 80cm; and controlling the power of the electrode and the adding speed of the basic material to ensure that the quantity of the added basic material is equivalent to that of the output liquefied material. The smelting process has the advantages of stable product quality, ideal opalescent effect, no fluoride pollution and high thermal efficiency.

Description

technical field [0001] The invention relates to a production process of opal glass, in particular to a production process for preventing fluoride volatilization of the base material of the opal glass during the smelting process. Background technique [0002] Opal glass is a kind of opal glass, which has a milky white appearance. Highly dispersed liquid droplets or precipitated crystal grains are produced in the glass body. Due to the large difference in refractive index between the two, light will scatter and present milky white light after irradiation. At present, most glass factories in my country use fluorides (cryolite, sodium fluorosilicate, fluorite, sodium fluoride) as opacifying agents for opalescent glass to enhance the effect of opalescent glass. The traditional smelting of opal glass basic materials uses coal-to-gas, natural gas, heavy oil, etc. as fuel to heat the outer wall of the furnace, and the heat conduction from the furnace wall to the materials in the fu...

AI Technical Summary

Problems solved by technology

At normal temperature, the basic material of opalescent glass is solid, and there is no fluoride volatilization. When the material is heated above 400°C, the fluoride in the material begins to volatilize in a small amount, and when it reaches above 1000°C, it volatilizes in a large amount, which causes a large amount of fluoride volatilization during the melting process. And escape out of the furnace, causing pollution and damage to the surrounding environment (people, animals and plants), and seriously affecting the opalescent effect of opalescent glass, resulting in chromatic aberration, resulting in unstable product quality and waste of materials

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