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Fine clarifying method of electric melting furnace and device

A clarification device and electric melting furnace technology, applied in glass manufacturing equipment, glass furnace equipment, manufacturing tools, etc., can solve problems such as difficulty in discharging glass liquid gas

Inactive Publication Date: 2009-09-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the molten glass is not completely clarified in the melting pool, and it is directly supplied to the forming machine, resulting in more small bubbles or even large bubbles in the final glass product. The main reason is that the viscosity of the molten glass entering the feeding channel is already at 10 3.5-3.8 About dPa·s, under the condition of glass viscosity, it is very difficult to discharge the gas in the glass liquid, so the glass bubbles that are not fully clarified in the melting pool of the electric melting furnace are permanently retained in the glass

Method used

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  • Fine clarifying method of electric melting furnace and device
  • Fine clarifying method of electric melting furnace and device
  • Fine clarifying method of electric melting furnace and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] First, melt the aluminosilicate glass (glass chemical composition wt%) with 17% alumina in the melting pool of the electric melting furnace: SiO 2 60.2, Al 2 O 3 17.3, CaO 0.5, MgO 4.0, Na 2 O 14.5, K 2 O 3.5, the highest temperature of the molten glass in the melting tank reaches 1640℃, and then enters the clarification tank through the flow hole and ascending channel. The clarification tank area is 35% of the melting tank area, the depth of the tank is 600mm, and the width of the clarification tank is the width of the feeding channel. 2 times, two rows of bottom molybdenum electrodes are used for power supply at the front of the clarification tank, and the glass viscosity is 10 2.5 dPa·s (temperature 1560℃), install a row of bubble tubes at the bottom of the clarification tank near two-thirds of the clarification tank, use pulse bubbling to control the bubbles passing into the glass liquid, and the glass liquid clarified by the clarification tank Enter the platinum decomp...

Embodiment 2

[0040] First, melt the Pyrex borosilicate glass (glass chemical composition wt%) containing 12.5% ​​boron oxide in the melting pool of the electric melting furnace: SiO 2 80.5, Al 2 O 3 2.5, B 2 O 3 12.5, Na 2 O 4.5, the maximum temperature of the molten glass in the melting tank reaches 1680℃, and then enters the clarification tank through the flow hole and ascending channel. The clarification tank area is 20% of the melting tank area, the depth of the tank is 300mm, and the width of the clarification tank is the width of the feeding channel. 3 times, two rows of bottom molybdenum electrodes are used for power supply at the front of the clarification tank, and the glass viscosity is 10 2.8 dPa·s (temperature 1590℃), install a row of bubble tubes at the bottom of the clarification tank close to two-thirds of the clarification tank, and use continuous bubbling to control the bubbles that pass into the glass liquid. The glass liquid clarified by the clarification tank Enter into the...

Embodiment 3

[0044] First, melt low-alkali glass fiber (glass chemical composition wt%): SiO 2 73.5, Al 2 O 3 0.5, B 2 O 3 22.5, Na 2 O 2.0, MgO 0.5, the highest temperature of the molten glass in the melting tank reaches 1540℃, and then enters the clarification tank through the flow hole and ascending channel. The area of ​​the clarification tank is 50% of the area of ​​the melting tank, the depth of the tank is 800mm, and the width of the clarification tank is the feed 1.5 times the width of the channel, two rows of bottom molybdenum electrodes are used for power supply at the front of the clarifier, and the glass viscosity is 10 2.8 dPa·s (temperature 1460℃), install two rows of bubble tubes at the bottom of the clarification tank near two-thirds of the clarification tank, and use a continuous method to control the bubbles that pass into the glass liquid, and the glass liquid clarified by the clarification tank enters the supply In the platinum decompression hood of the forehearth, an exhau...

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Abstract

The invention provides a fine clarifying method applicable to an electric melting furnace and a device; a clarifying pool is connected with a rising channel of the electric melting furnace; the viscosity of molten glass is kept less than 102.0-103.0dPa.s, the area of the clarifying pool is 20-50 percent of the area of a melting pool, and the depth of the clarifying pool is 300-800mm; the rear part of the clarifying pool is connected with a pressure-reducing cover; the viscosity of the molten glass in the pressure-reducing cover is about 103.0-104.0dPa.s, so as to lead the partial pressure in the pressure-reducing cover to be small than the partial pressure in the molten glass; the gas remained in the molten glass overflows; a material-supplying channel is connected with the rear part of the pressure-reducing cover; by further temperature-reducing adjustment of the material-supplying channel, so as to achieve the needed viscosity of a forming machine or a material-supplying device; by the technique for fine clarifying and the device, the diameter of the bubble of the glass product is smaller than 0.2mm, the quantity of the bubble is smaller than or equal to 5 for every 1000g of glass, thus achieving the melting quality level of optical glass.

Description

Technical field [0001] The invention relates to a clarification method and device in the glass melting technology of an electric melting furnace. The invention is particularly suitable for the production of borosilicate glass, aluminosilicate glass, low-alkali glass fiber, electronic display glass and other glasses. These glasses are characterized by high viscosity and surface The tension is large, and the bubbles are difficult to remove from the molten glass. Therefore, it is difficult to obtain satisfactory glass clarification quality during the glass melting process. Therefore, the appearance of the formed glass product shows many bubble defects. The present invention fully solves the problem of electric melting furnace. The problem of fine glass clarification in the process of melting glass can reach the level of optical-grade glass bubble control. Background technique [0002] Glass melting is a very complicated process, which includes a series of physical and chemical react...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B5/225
CPCC03B5/225C03B5/2257
Inventor 田英良孙诗兵
Owner WUHAN UNIV OF TECH
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