Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Fluoride emissions from Pidgeon process for magnesium production
School of Material Science & Engineering, Beifang University of Nationality, Yinchuan, Ningxia.
School of Material Science & Engineering, Beifang University of Nationality, Yinchuan, Ningxia.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
School of Material Science & Engineering, Beifang University of Nationality, Yinchuan, Ningxia.
2012 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

Primary magnesium is nowadays produced in China via Pidgeon process. An important reaction in the process is silicothermic reduction of MgO from dolime near 1200ºC under pressure of 2-10 Pa to generate Mg vapor. Fluorite, ranging 2-3% (mass fraction), is usually mixed with the raw materials to catalyze the reaction. Under the process conditions, CaF2 in the fluorite may form some fluorides to vaporize, thus polluting air. The fluorides remaining in the solid process waste, the Mg slag, may be dissolved to cause water pollution.In the present study, experiments were performed by using retorts of pilot scale in a maffle furnace to simulate the Pidgeon process for primary Mg production. The test materials, briquettes of 5.6-10 kg made of dolime, ferrosilicon and fluorite, were charged in the retorts and heated under conditions similar to the industry operation. Fluoride minerals in the Mg slag from the simulation experiments were identified by XRD and SEM-EDS techniques. Quantities of some F-containing phases formed in the process under equilibrium condition were calculated by FactSage 6.2 thermodynamic package. Fluoride distributions were determined to establish an F-balance among the input and output materials. Besides, slag samples from a magnesium plant were also characterized, including leaching test according to EN 12457-2.Based on these results, fluoride impacts on the environment were evaluated and discussed. Suggestions were also presented to minimize the environmental impacts from primary Mg production using the Pidgeon process.

Place, publisher, year, edition, pages
2012.
Keyword [en]
Chemistry - Environmental chemistry
Keyword [sv]
Kemi - Miljökemi
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-40024Local ID: efe27882-9b63-437b-ab20-912f8ed0fe32OAI: oai:DiVA.org:ltu-40024DiVA: diva2:1013546
Conference
International Conference on Solid Waste Technology and Management : 11/03/2012 - 14/03/2012
Note
Godkänd; 2012; 20120410 (yang)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved

Open Access in DiVA

fulltext(649 kB)29 downloads
File information
File name FULLTEXT01.pdfFile size 649 kBChecksum SHA-512
dcaac135580b163b0deb37ddf0e25d083e594653dc9a3ca88fb79e49863bd66ec74e5811279965b869f7c9ba88a13e73e323e41e03fffdf0311c64f6688d6ac7
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Yang, Qixing
By organisation
Sustainable Process Engineering
Metallurgy and Metallic Materials

Search outside of DiVA

GoogleGoogle Scholar
Total: 29 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 17 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf