Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Microstructure characterization of mechanically activated hematite using XRD line broadening
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Industriell miljö- och processteknik.
2006 (Engelska)Ingår i: International Journal of Mineral Processing, ISSN 0301-7516, E-ISSN 1879-3525, Vol. 79, nr 2, s. 106-119Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The effect of dry milling in a vibratory mill on the structural changes and microstructural characteristics of hematite using different methods was investigated. We have described the line profile analysis (LPA) to extract the size of coherently diffracting domains and the lattice strain of activated hematite in a vibratory mill. The Warren-Averbach and Williamson-Hall methods were used as the main tools for characterization. The changes in the particle size, surface area and new phase formation of hematite concentrate were also investigated. It was concluded that the breakage and agglomeration of particles take place mainly at lower and higher levels of specific energy input, respectively. The pores in agglomerates remain accessible for the nitrogen gas. Milling of hematite increased specific surface area up to 18.4 m(2)/g. The hematite milled under various levels of specific energy input did not undergo a significant reaction or phase transformation during milling. The Williamson-Hall method confirms its merit for a rapid overview of the line broadening effects and possible understanding of the main causes. The anisotropic character of line broadening for deformed hematite as a function of specific energy input was revealed. Higher level of specific energy input favors the generation of small crystallite size, higher microstrain, BET surface area, amorphization and line breadth. The Warren-Averbach method suggested that the nanocrystalline hematite with grain sizes of 73.5-12.2 nm was formed by mechanical treatment using different milling intensities in the vibratory mill. The root mean square strain (RMSS) at L = 10 nm varies between 1.7 x 10(-3) and 4.0 x 10(-3) depending on the level of energy input. Limits in the applicability of Williamson-Hall method and reliability of the results are discussed in detail.

Ort, förlag, år, upplaga, sidor
2006. Vol. 79, nr 2, s. 106-119
Nationell ämneskategori
Metallurgi och metalliska material
Forskningsämne
Mineralteknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-4958DOI: 10.1016/j.minpro.2006.02.001ISI: 000237556200004Scopus ID: 2-s2.0-33748278552Lokalt ID: 2f74bb60-a234-11db-8975-000ea68e967bOAI: oai:DiVA.org:ltu-4958DiVA, id: diva2:977832
Anmärkning
Validerad; 2006; 20070112 (pafi)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-07-10Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltextScopus

Person

Pourghahramani, ParvizForssberg, Eric

Sök vidare i DiVA

Av författaren/redaktören
Pourghahramani, ParvizForssberg, Eric
Av organisationen
Industriell miljö- och processteknik
I samma tidskrift
International Journal of Mineral Processing
Metallurgi och metalliska material

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 83 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf