METHOD OF PRODUCING POROUS WHISKERS α-AlO USING LEAD-ZINC PRODUCTION WASTES Russian patent published in 2020 - IPC C01F7/42 C30B29/20 C30B29/62 C22B7/04 C04B35/65 

FIELD: chemistry.

SUBSTANCE: invention can be used in production of sorbents, filters, catalyst supports and heat-resistant materials. To produce porous whiskers α-Al₂O₃ using lead-zinc production wastes, heat treatment of pre-moulded in form of cylinders of oxide-containing powders with aluminium. Heat treatment includes heating to temperature of 1150 °C, further holding the mixture at this temperature and cooling. Mixture is heated at rate of 20 °C per minute and held at a given temperature for 30 minutes. As a matrix for growth of whiskers there used are wastes of lead-zinc production of fraction 0.071 mm, containing, wt. %: 50.1 - SiO₂, 12.1 - K₂O, 11.1 - Al₂O₃, 9.3 - Fe₂O₃, 8.5 - SO₃, 2.9 - TiO₂, 1.9 - CaO, 1.4 - MgO, 0.9 - Cl, 0.47 - PbO, 0.3 - P₂O₅, 0.15 - ZnO.

EFFECT: invention eliminates need to use expensive materials for synthesis of porous whiskers α-Al₂O₃, reduce duration of the process.

1 cl, 1 tbl, 1 ex, 3 dwg