Effectiveness of Jet Milling for Producing Superfine Powders from Blast Furnace Slag

V.P.Kravchenko,
   

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2016, #11/12
http://www.materials.kiev.ua/article/2278

Abstract

The effect of ball (drum) grinding and jet milling on the particle size distribution and specific surface area of powders produced from blast furnace slag is studied. The effectiveness of jet milling, providing relatively equal powder particles (size of more than 85% of fractions is 0–10 µm), is shown. Decrease in the average particle size leads to greater specific surface area of the powder and leads to a sharp increase in activity (strength of the samples prepared with use of blast furnace slag). The powder hydraulic activity σ ≥ 30 MPa can be reached from slag with an average particle size to 12 µm and specific surface area S = 0.6–0.8 g2/g, which increases the sample strength. The strength of cemented compositions based on blast furnace slag can be increased to 40–43 MPa by adding 15–20% Portland cement to the starting mixture.


BINDING PROPERTIES, BLAST FURNACE SLAG, DISPERSIVITY, GRINDING, HYDRAULIC ACTIVITY, POWDER, SPECIFIC SURFACE AREA