Materials Science

Characterization of the microstructure and
mineral phases of German iron and steel slags

Summary: This work characterizes the mineral composition, amorphous fractions and microstructure of various iron and steel slags by chemical analysis as well as by X-ray diffraction and electron microscope investigations. The results show that different German  iron and steel slags differ in their chemical and mineralogical compositions as well as in their characteristic parameters, such as basicity and proportion of amorphous constituents, and in the levels of periclase and free lime that are responsible for possible changes. The investigations have been carried out so that iron and steel slags can be put to appropriate use in the building materials industry. In particular, it was intended that the iron and steel slags could be used to reduce the risk of an alkali-silica reaction (ASR) in concrete.

1 Introduction
The recycling of iron and steel slag is currently an urgent and important problem for all scientists throughout the world, but particularly for Chinese scientists. In Germany there is already a great deal of experience with the recycling of iron and steel slag. The tests to characterize the microstructure and mineral phases of German iron and steel slag from different production processes have provided practical guidelines for improving the quality of iron and steel slags in other countries, especially China. Good quality is an essential requirement for effective and...

Related articles:

Issue 2022-4 FEHS BUILDING MATERIALS INSTITUTE

High-temperature-resistant concrete with iron mill slags

Concrete components for many industrial processes, for example in steel or cement production, are exposed to the highest stresses. These include permanent or recurring extreme temperatures of up to...

more
Issue 2021-7 FEHS BUILDING MATERIALS INSTITUTE

Demand for iron slag to remain high in 2020 

Demand for iron mill slag in Germany was again high last year. Due to the pandemic and the resulting decline in crude steel production to 35.7 million t, only 10.9 million t of iron slag were produced...

more
Issue 2013-03

Influence of the granulation conditions and ­performance potential of granulated blastfurnace slag – Part 2: Chemistry and physical properties

3.2 Physical properties and reactivity It is theoretically possible that changed grain morphology could be associated with a changed glass structure, and therefore also with changed reactivity of the...

more
Issue 2017-7-8 WO2017085565 (A2)

Portland cement free activation of ground granulated blast furnace slag

(22) 16.11.2016 (43) 26.05.2017 (57) A Portland cement-free cementitious binder composition, said composition comprising: ground granulated blast furnace slag and/or pulverized fly ash; an alkali...

more
Issue 2020-11-12 US 2020/0299194 A1

Granulated blast-furnace slag activator, its manufacturing method thereof, and manufacturing method of cement

(22) 21.03.2019 (43) 24.09.2020 (57) Provided are a granulated blast-furnace slag activator and a method of manufacturing the same. The granulated blast-furnace slag activator includes, in percent by...

more