Platov South-Russian State Polytechnic University (NPI), Novocherkassk, Russia:

S. N. Sergeenko, Associate Professor, Senior Researcher, Candidate of Technical Sciences, e-mail: sergeenko@gmail.com
A. N. Vasiliev, Postgraduate Student, e-mail: sasha_vasilev55@mail.ru
A. N. Yatsenko, Associate Professor, Candidate of Technical Sciences

Southern Federal University, Rostov-on-Don, Russia:
M. A. Marakhovsky, Head of the Sector, Candidate of Technical Sciences

The technology of obtaining hot-compacted Pb – C composite materials (CM) based on chip waste of recycled storage battery electrodes is considered. On the basis of a two-factor experiment, the effect of the graphite content C_ГК and mechanical activation (τ_МА) time МА on the relative density of moldings, hardness (HRR), and shear strength (τ_В) of the hot-compacted Pb – C composite material was studied. The agglomeration of small and large particles was revealed when obtaining a charge in the mixing mode. An increase in the MA duration to extreme values (τ_МА = 1.8 ks) leads to the destruction of agglomerates. It is shown that the minimum values of the relative molding density depend on the content of the fraction with sizes of 35–63 μm in the charge and are observed with the introduction of 0.5% (wt.) graphite and the MA duration of 1.8 ks. On the basis of multicriteria optimization, the optimal values of technological factors (τ_МА = 3.0 ks; C_G = 0.15% (wt.)) for preparing the charge obtained in the MA mode were determined, providing increased values of strength and hardness (HRR = 85, τ_В = 15.6 MPa) of the hot-compacted Pb – C composite material.

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