Processing and Application of Ultra disperse Wastes of Silicon Production in Construction

Abstract

One of the promising applications of nanosilica is the modification of the properties of concretes and mortars to achieve improved performance characteristics and reduce construction time. This direction was called UHPC (Ultra High Perfomance Concrete). The global trend is to use of nanosized particles with a large surface area and high pozzolanic activity. Nanosilica is the modifier of "nanoconcretes" that is most accessible for mass use. The nano-dispersed silica dust, which is a product of a gas scrubbing in the ore-thermal production of silicon-containing alloys, contains about 75-85% of SiO2 and a large amount of foreign impurities such as carbon, silicon carbide, iron, etc. Due to the low purity, crude gas scrubbing product finds wide use only in the construction industry as a mineral additive to cements. The cost of the initial gas scrubbing product is in the range from 5 to 20 thousand rubles per ton. Studies on the preliminary scrubbing of the crude product were carried out. A gas scrubbing product enriched to a silica content of 98% was obtained. Experiments to modify concrete with new enriched material in construction, in ferrous and non-ferrous metallurgy were carried out.