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Test for Fe2+ and Fe3+ content in glass

A glass and content technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of heavy workload, delayed problem solving timing, poor data accuracy and repeatability, etc.

Inactive Publication Date: 2005-12-28
CHINA LUOYANG FLOAT GLASS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process takes a long time and takes about 8 hours; Fe 2+ and Fe 3+ The analysis is two different operating procedures, and the workload is heavy; due to the complexity of the process, errors are prone to occur, especially for Fe 2+ The analysis of environmental factors is relatively large, the operation method is difficult to master, and the accuracy and repeatability of the data are poor.
Obviously, using this method to control production cannot timely and accurately feed back information on changes in ferrous iron / total iron in glass and changes in production technology, delaying the timing of problem solving

Method used

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  • Test for Fe2+ and Fe3+ content in glass
  • Test for Fe2+ and Fe3+ content in glass
  • Test for Fe2+ and Fe3+ content in glass

Examples

Experimental program
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Effect test

Embodiment 1

[0037] For white glass with a thickness of 4.91mm, the absorbance curve of the glass in the wavelength range of 350nm-1100nm is measured on the spectrophotometer. The absorbance of the glass at the wavelength of 770nm and 1050nm is 0.1113 and 0.1421 respectively, and the absorbance difference of 1mm glass is: ( 0.1421-0.1113) / 4.91=0.0059, brought into the formula Fe 2+ (Wt%)=3.001(K 1050 -K 770 ) / d+0.0009, get Fe 2+ The content of 0.0187%. Take the second-order derivative of the absorbance curve measured above (the test instrument has this function), and obtain the maximum value of the second-order derivative of the absorbance at a wavelength between 370nm and 390nm, 0.0005619, which is K d II , this value is divided by the glass thickness 4.91, and the maximum value of the second derivative of the absorbance of 1mm glass is 0.0001144, which is K II , into the formula Fe 3+ (Wt%)=495.66K d II / d+0.0033, calculated Fe 3+ The content of 0.060%.

Embodiment 2

[0039] For green glass with a thickness of 9.86mm, the absorbance curve of the glass at the wavelength range of 350nm-1100nm is measured on the spectrophotometer. The absorbance of the glass at the wavelength of 770nm and 1050nm is 0.646 and 1.015 respectively. The absorbance difference of the 1mm glass is: (1.015-0.646) / 9.86=0.0374, into the formula Fe 2+ (Wt%)=3.001(K 1050 -K 770 ) / d+0.0009, get Fe 2+ The content of 0.113%. Take the second-order derivative of the absorbance curve measured above (the test instrument has this function), and obtain the maximum value of the second-order derivative of the absorbance between 370nm and 390nm, which is 0.00603, which is K d II , this value is divided by the glass thickness 9.86 to get the maximum value of the second derivative of the absorbance of 1mm glass, which is K II 0.00061, substituted into the formula Fe 3+ (Wt%)=495.66K d II / d+0.0033, calculated Fe 3+ The content of 0.306%.

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Abstract

A method for testing Fe2+ and Fe3+ content in glass includes using spectrophotometer to detect out raw glass absorbance at wavelength of 350 nm - 1100 nm, utilizing absorbance difference value of 1 mm glass at wavelength of 1050 nm and 770 nm to calculate out Fe+2content with formula of Fe2+ (wt %) = 3.001 (K1050 - K770) / d + 0.009; carrying out second order calculation of absorbance curve of 350 nm - 1100 nm wavelength to obtain Kd and R derivatives for calculating Fe3+ content with formula of Fe3+ ( wt % ) = 495.66 Kd / d + 0.0033 .

Description

Technical field [0001] The invention belongs to the technical field of glass testing methods, and mainly relates to Fe in glass. 2+ and Fe 3+ Content test method. technical background [0002] In the glass melting furnace, the iron content in the glass is an important parameter, and the iron in the glass is Fe 2+ and Fe 3+ There are two valence states, and the ratio of the two can represent the redox state of the glass, and there is a certain relationship between the redox state of the glass and the number of bubbles in the finished glass. And the Fe in the glass 2+ Can strongly absorb infrared rays, Fe 3+ Can strongly absorb ultraviolet rays, Fe 2+ The content of α has a significant effect on the heat transfer in the glass melting process, and will directly affect the temperature distribution of the molten glass in the furnace, thus affecting the melting and clarification of the glass. a direct reflection of the state. Therefore, the rapid detection of Fe in glass ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 姜宏王桂荣赵会峰鲁鹏有学军王晓东马洁韩颖
Owner CHINA LUOYANG FLOAT GLASS GROUP
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