Mechanisms of silica refractory corrosion in glass-melting furnaces: Equilibrium predictions

PDF Version Also Available for Download.

Description

Corrosion of refractory silica brick used to line the roof or crown of many-glass-melting furnaces is a serious problem in furnaces using oxygen-fuel rather than air-fuel. In this work, the authors report equilibrium calculations for the Na{sub 2}O-SiO{sub 2} system that predict the formation of a variable-composition liquid-solution phase as a function of key furnace variables. Since thermodynamic data for the relevant liquid phases are unavailable in standard compilations, new data generated using the associate species model are included in the calculations. The calculations indicate that gas-phase NaOH concentrations less than {approximately}15 ppm will not react with the silica refractory ... continued below

Physical Description

12 p.

Creation Information

Mark D. Allendorf, SNL /CA & Karl E. Spear, Penn State University October 17, 1999.

Context

This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 24 times . More information about this article can be viewed below.

Who

People and organizations associated with either the creation of this article or its content.

Sponsor

Publisher

  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this article. Follow the links below to find similar items on the Digital Library.

Description

Corrosion of refractory silica brick used to line the roof or crown of many-glass-melting furnaces is a serious problem in furnaces using oxygen-fuel rather than air-fuel. In this work, the authors report equilibrium calculations for the Na{sub 2}O-SiO{sub 2} system that predict the formation of a variable-composition liquid-solution phase as a function of key furnace variables. Since thermodynamic data for the relevant liquid phases are unavailable in standard compilations, new data generated using the associate species model are included in the calculations. The calculations indicate that gas-phase NaOH concentrations less than {approximately}15 ppm will not react with the silica refractory under either air-fired or oxy-fired conditions, since this is the smallest equilibrium NaOH partial pressure in a system containing crystalline SiO{sub 2} (either cristobalite or tridymite) in equilibrium with a variable-composition sodium-silicate liquid phase at refractory temperatures in the range 1,400--1,700 C. The high water content ({approximately}65%) of oxygen-fired furnaces results in measured NaOH(g) concentrations as high as 300 ppm, which greatly exceeds the 1,600 C maximum of 68 ppm NaOH(g) for oxy-fired equilibrium with a liquid-SiO{sub 2} (crystalline) system. This indicates that there is a thermodynamic driving force for NaOH(g) to react with silica refractories in oxy-fired furnaces. The results of the calculations are used to define a critical temperature, above which corrosion is not expected to occur for a given NaOH(g) partial pressure.

Physical Description

12 p.

Notes

OSTI as DE00755557

Medium: P; Size: 12 pages

Source

  • Per Kofstad Memorial Symposium on High Temperature corrosion and Materials Chemistry, Honolulu, HI (US), 10/17/1999

Language

Item Type

Identifier

Unique identifying numbers for this article in the Digital Library or other systems.

  • Report No.: SAND2000-8515C
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 755557
  • Archival Resource Key: ark:/67531/metadc710129

Collections

This article is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

What responsibilities do I have when using this article?

When

Dates and time periods associated with this article.

Creation Date

  • October 17, 1999

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

Description Last Updated

  • April 6, 2017, 8:22 p.m.

Usage Statistics

When was this article last used?

Yesterday: 0
Past 30 days: 3
Total Uses: 24

Interact With This Article

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

International Image Interoperability Framework

IIF Logo

We support the IIIF Presentation API

Mark D. Allendorf, SNL /CA & Karl E. Spear, Penn State University. Mechanisms of silica refractory corrosion in glass-melting furnaces: Equilibrium predictions, article, October 17, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc710129/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.