Production of environmentally safe building materials on the basis of the waste foundry sand
Ya. I. Vaisman K. G. Pugin, L. V. Rudakova, I. S. Glushankova, K. Y. Tyuryukhanov
Section: Ecologization of industry
The object of the research was the waste foundry sand of one of the typical steelmaking enterprises. Estimation of pollutant
emissions from the composition of waste foundry sand has shown their low emission and biological activity, which allowed
to develop a technology for its utilization with obtaining environmentally safe construction material. The granulometric
composition of the waste foundry sand was determined with an average grain size of 0.38 mm. Based on the results of the
analysis of buffer extracts, the content of heavy metals in the samples of waste foundry sand in mobile form was determined.
Heavy metals (lead, zinc, chromium, nickel, manganese), as well as phenol and formaldehyde, were chosen as the indicators.
Samples of waste foundry sand contain formaldehyde in mobile form exceeding the limits for soil. It has been proposed to use
formaldehyde-containing sand in a dense and hydrophobic structure, such as asphalt concrete, to reduce the formaldehyde
emission. Investigations of the physical and mechanical properties of waste foundry sand showed that it is suitable for use as
a mineral aggregate in the production of asphalt concrete mixtures. The conducted studies of asphalt concrete samples in the
composition, which as a fine mineral filler used waste foundry sand, showed that it meets the requirements of Russian standard
GOST 9128-2013. Physico-mechanical characteristics of the asphalt-concrete mixture correspond to asphalt concrete of
B type I grade. The proposed recycling technology is possible without significant capital investment in most steel mills. The
implementation of this technology will reduce the industrial impact on the environment in the locations of the steel plant.
Keywords: sand waste, recycling, asphalt, industrial waste, construction materials
Article published in number 3 for 2018 DOI: 10.25750/1995-4301-2018-3-109-115
ISSN 1995-4301
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