Abstract

The use of waste as raw material to obtain commercially promising products allows us to solve a whole range of environmental, economic and social problems, especially during a crisis. The main share of unused waste consists of metallurgical waste, which can be a source of microelements for plants. Slag waste, due to its component composition, can also act as a soil degrader. The goal of the work is to create a technology for using dried blast furnace sludge alone or in combination with converter slag in agricultural production as a microelement fertilizer to increase the productivity of agricultural plants; reducing the volume of metallurgical waste disposed of in landfills. Using electron microscopy, it was found that blast furnace sludge granules reach a size of 15 microns, while the size of converter slag particles ranges from 20 to 500 microns. Analysis of the elemental composition of the slag sample showed that the waste contains Ca, Fe, Mg, Si, Al, Mn. The composition of blast furnace slurry includes Fe, Zn, Al, Ca, Si, Na. Using X-ray diffraction analysis, it was established that the predominant compound in the converter slag is calcium oxide (53%). The composition of blast furnace sludge mainly includes iron oxide. The results of the study showed high tolerance of vetch at a sludge concentration of 0.1 g/kg in acidified soil conditions, the increase in stem length increased by 17%, and its wet biomass increased by 30%. The increase in root length was 48%. The greatest increase in the dry mass of the stem was observed when sludge was added at concentrations of 0.01 g/kg (+71%) and 1 g/kg (+86%) in acidified soil against the background of the addition of slag. The accumulation of zinc extracted from blast furnace sludge in plant tissues of vetch has also been established. Thus, the studied waste from metallurgical production can be used as a mineral fertilizer, since it contains microelements necessary for the mineral nutrition of plants.

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