NEW MATERIAL AND METHOD FOR OBTAINING MATERIAL FOR USE AS AN ENERGY STORAGE DEVICE AS PART OF A SENSITIVE ENERGY STORAGE SYSTEM IN THE LOW-, MEDIUM- OR HIGH-TEMPERATURE SECTOR Russian patent published in 2021 - IPC C04B28/00 F24H7/00 

FIELD: energy storage.

SUBSTANCE: present invention relates to modified red sludge/modified bauxite residue, as well as a method for obtaining it and an energy storage device containing modified red sludge, a heat storage device containing an energy storage device, and methods for using modified red sludge as an energy storage device, in particular, as part of a heat storage device. Modified red sludge contains following components: hematite (Fe₂O₃), corundum (Al₂O₃), rutile (TiO₂) and/or anatase (TiO₂), quartz (SiO₂), in some cases perovskite (CaTiO₃) and in some cases pseudobrucite ((Fe³⁺,Fe²⁺)₂(Ti,Fe³⁺)O₅), nepheline ((Na,K)[AlSiO₄]) and/or gayuinite ((Na,Ca)_4-8[Al₆Si₆O₂₄(SO₄)]). At the same time, modified red sludge contains Na₂O and/or glass, in amount of less than 0.5% by weight of Na₂O and/or glass. Modified red sludge has a particle size d10 in the range of 0.5 to 2.5 mcm and/or a particle size d90 in the range of 15 to 50 mcm. Red sludge is washed with water containing iron (II) chloride, dried, then heated to a temperature of at least 800°C, preferably at least 1000°C or 1150°C.

EFFECT: achieved technical result is an increase in the service life during operation in the temperature range up to 1000°C.

37 cl, 5 tbl, 4 dwg, 3 ex