Abstract
Inorganic water-soluble substances and fly ash residues of sunflower bran coverings (hulls, husks) ( Helianthus annuus L.), sampled over different years and across several regions of Russia, were studied. The removal of extractive substances was carried out at different pH values using water, acid solutions, sodium hydroxide and ammonium oxalate. The methods of atomic absorption, X-ray diffraction, differential thermal and microprobe analysis, as well as IR spectroscopy and scanning electron microscopy, were used to study the extracted products. It was established that the nature of the extractant has a significant effect on the yield of extractive substances and ash residues. Potassium, calcium and magnesium ions have the greatest concentration, both in raw material extracts as well as in ash residues. Carbonates were found to comprise the main compounds in the ash composition.
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