Granulation von Hochofenschlacke im Zinnbad

Translated title of the contribution: Granulation of blast furnace slag in a tin bath

Maximilian Haider

Research output: ThesisMaster's Thesis

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Abstract

In this thesis the granulation of liquid blast furnace slag in a tin bath is examined. First off, an elaborate literature review discusses the state of the art regarding slag granulation and the essential processes – in addition to already established technology, there are new approaches for energy recovery – are presented. Furthermore, the origin of the blast furnace slag, its intended use as well as its composition and the accumulating quantities are described. The granulation in a tin bath is carried out as part of the practical experiments in the laboratory. Liquid blast furnace slag is quenched in a stirred Sn-bath at different temperatures of 300 °C, 400 °C, 500 °C and 600 °C. At 300 °C and 600 °C, one trial without stirring is performed additionally. The temperature of the metal bath and also of the added or removed masses are permanently recorded in order to draw different conclusions. Slag and tin bath are sampled before and after each experiment for further analysis. Optical emission spectrometry, scanning electron microscopy, X-ray powder diffraction, inductively coupled plasma optical emission spectrometry and X-ray fluorescence analysis are used as analysis methods. The results of the examination show that a temperature range from 350–400 °C is ideal for slag granulation in a tin bath. The bath has to undergo turbulence, e. g. due to stirring, and it can be considered inert (except for dissolving iron from the slag). The slag does not change significantly in its composition by granulation and it solidifies amorphously. Only Sn and SnO2 are enriched. A clean separation of slag and tin, a continuous dissipation of thermal energy and an improvement of the protection of the Sn-bath against oxidation remain the subject of further research.
Translated title of the contributionGranulation of blast furnace slag in a tin bath
Original languageGerman
QualificationDipl.-Ing.
Awarding Institution
  • Montanuniversität
Supervisors/Advisors
  • Antrekowitsch, Helmut, Supervisor (internal)
  • Wibner, Stefan, Co-Supervisor (internal)
Award date1 Jul 2020
Publication statusPublished - 2020

Bibliographical note

embargoed until null

Keywords

  • granulation
  • Blastfurnace slag
  • Tin bath
  • slaggranulation
  • energy recovery
  • Sn-bath
  • granulated blastfurnace slag
  • ground granulated blastfurnace slag

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