STONE CASTING Russian patent published in 2019 - IPC C04B30/00 

FIELD: chemistry.

SUBSTANCE: invention relates to composition of stone casting from industrial wastes, which can be used in production of decorative, facing and construction materials. Cast stone material contains the following in wt. %: SiO₂ 48.9–50.0; Al₂O₃ 4.3–4.5; CaO + MgO 26.7–27.0; Na₂O + K₂O 2.8–3.0; Fe₂O₃ 3.8–4.0; TiO₂ 0.14–0.15; MnO 0.12–0.15; PbO 0.17–0.2; ZnO 0.07–0.1; impurities 10.9–13.0.

EFFECT: technical result is non-waste production of standard commercial product of dark color, up to black, with simultaneous utilization of lead-zinc production wastes.

1 cl