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
Leaching results in the assessement of slag and rock materials as construction material
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Extraction of rock material and ore for construction and metal production involves large quantities of wastes and by-products. Iron- and steelmaking slag has durability qualities and latent cementitious properties which are positive in construction. The leaching of so-called hazardous metals is important in the evaluation of secondary materials for utilization, while knowledge of the leaching behaviour is not required for rock materials used in road making. Iron- and steelmaking slags have varying content of glass and puzzolanic minerals that hydrate in contact with water. The influence of the puzzolanic properties in leaching tests is not considered. Swedish rock materials have been investigated with the availability test, NT ENVIR 003, in order to form a basis for comparison of soluble trace elements. A long-term leaching test, NVN 7347, has been used to determine whether diffusion is the dominating leaching mechanism in a quenched, amorphous BF slag. Four different slag types, modified by rapid cooling, have been investigated with the compliance test, EN 12457-2. Overall, the solubility of metals from the rock materials was low but a substantial part of sulphide-bound elements were released under oxidizing conditions, and compared to metallurgical slags, the released amounts of some elements were larger. The major phase had an important influence on the solubility of trace elements. An amorphous slag without puzzolanic properties has low solubility and prevents leaching of enclosed trace elements. For a cementitious slag, both dissolution and stabilizing reactions take place during a leaching test and the matrix may be dissolved to a large degree. Quenching of a slag for increased glass content implies more phase transformations, and equilibrium will not be reached in a short- term test. The reactions of the puzzolanic minerals hamper the evaluation of leaching tests results. For a proper assessment, knowledge of material properties and leaching tests is essential. The solubility of the trace elements in the original and modified steelmaking slags was low and a reduction is difficult without better control of the major phases. Rapid cooling results in a more homogeneous slag with few phases and the control of the properties are thereby enhanced. Results from leaching tests of both rock materials and slags should be used in a wider context in order to give the test results a reasonable importance in the evaluation of the materials.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2005. , p. 39
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544 ; 2005:44
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-18608Local ID: 96bbabf0-5165-11db-9592-000ea68e967bOAI: oai:DiVA.org:ltu-18608DiVA, id: diva2:991617
Note
Godkänd; 2005; 20061001 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

Open Access in DiVA

fulltext(4122 kB)774 downloads
File information
File name FULLTEXT01.pdfFile size 4122 kBChecksum SHA-512
6e706bfbb25dc7daea38301f7296ec765d7998140528bd4abdd62d4a6e64191f47e052b09556e1ce7c305007fe1f06209184fd3309faa7d5b90c254c885d017c
Type fulltextMimetype application/pdf

Authority records

Tossavainen, Mia

Search in DiVA

By author/editor
Tossavainen, Mia
Metallurgy and Metallic Materials

Search outside of DiVA

GoogleGoogle Scholar
Total: 774 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: 907 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