The effect of technical lignin on the characteristics of road bitumen obtained by oxidation of petroleum residues (oxidized bitumen) was examined. Two samples of hydrolysis-type technical lignin, obtained as a by-product of the production of feed yeast, were used. The first sample was technical lignin purified by sieving to remove unprocessed plant material. The second sample was technical lignin, purified by sieving to remove unprocessed plant material and flotation enrichment to remove inorganic components. The effect of adding two samples of technical lignin in different amounts on the main performance characteristics of road bitumen was analyzed. It was concluded that it is advisable to use technical lignin as a relatively inexpensive substitute for much more expensive road oil bitumen. It was also concluded that flotation beneficiation is effective as a method of increasing the purity of technical lignin.
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