Production of Silicate Materials with Addition of Fine-Ground Open-Hearth Furnace Slag

The necessity of expanding the local raw material base for the production of silicate building materials due to anthropogenic alumino-silicate raw materials is shown. The chemical-mineralogical composition and the possibility of fine grinding of open-hearth furnace slag of steelmaking are investigated. The major mineral phases of the slag are melilite, kirschsteinite, magnesioferrite, wustite, periclase and forsterite. According to the sieve analysis it was found that 50–58% of the slag falls on the fraction of more than 5 mm. The optimal parameters of two-stage slag grinding, including coarse crushing to a fraction of less than 10 mm and fine grinding for 50–60 minutes to a fraction of 100–300 microns are determined. By chemical composition (about 50% of alkaline earth oxides) and the presence of hydraulically active minerals it is proposed to use the slag as the main component of lime-silica binder in the technology of silicate bricks. The influence of the addition of fine slag in the autoclave binder on the physical and mechanical properties of silicate samples was revealed. It is established that the introduction of 15–25% of crushed open-hearth furnace slag instead of calcium air lime into the autoclave binder composition provides an increase in the compressive strength of silicate samples by 15–20%. The optimum composition of the autoclaved binder with the use of a finely ground open-hearth furnace slag which provides the strength of silicate compacted material not below 25–30 MPa is experimentally established.

A.Yu. STOLBOUSHKIN, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Siberian State Industrial University (42, Kirova Street, Novokuznetsk, 654007, Russian Federation)

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