METHOD OF ELUTING CALCIUM FROM STEEL-SMELTING SLAG AND METHOD OF EXTRACTING CALCIUM FROM STEEL-SMELTING SLAG Russian patent published in 2020 - IPC C01F5/24 C01F11/18 C04B5/00 

FIELD: chemistry.

SUBSTANCE: present invention relates to methods of elution and extraction of calcium from steel-smelting slag. Disclosed is a method of eluting calcium from steel-smelting slag, comprising steps of steel-smelting slag being subjected to hydration treatment, wherein during hydration treatment steel melting slag is immersed into water and left settling or water and steel melting slag is mixed and mixed into paste and then leave paste to settle, wherein calcium compounds other than free lime are hydrated and lead steel-smelting slag which has been subjected to hydration treatment, in contact with water solution by immersing slag in water solution containing at least 30 mg/l of carbon dioxide. Method of eluting calcium from steel-smelting slag, comprising steps of bringing steel smelting slag into contact with aqueous solution by immersing slag in aqueous solution containing at least 30 mg/l of carbon dioxide, and when steel melting slag is brought into contact with aqueous solution, steel-smelting slag is crushed using crusher or steel melting slag surface is abraded using crusher. Method of extracting calcium from steel-smelting slag, involving stages, according to which eluate calcium from steel-smelting slag using said methods and eluted calcium is extracted.

EFFECT: technical result is reduction of number of steel-smelting slag used for burial.

5 cl, 7 dwg, 3 ex, 4 tbl