PHOSPHATE BINDER FOR REFRACTORY COMPOSITIONS Russian patent published in 2025 - IPC C04B35/447 C04B28/34 C04B35/185 

FIELD: chemistry.

SUBSTANCE: invention relates to phosphate binders used for making refractories, mainly of corundum composition, and can be used in production of unshaped and moulded refractories, as well as for repair of refractory lining of furnace units. According to the invention, the phosphate binder for refractory articles, which contains orthophosphoric acid and aluminium hydroxide, contains enriched kaolin and additionally contains a diluent in form of polycarboxylic acids, with the following ratio of components, wt.%: orthophosphoric acid 61.7-66.0, aluminium hydroxide 16.6-17.5, enriched kaolin 13.7-14.5, diluent reagent 2-8.

EFFECT: increased uniform density of samples after moulding, as well as significant reduction of thickening of binder during long-term storage.

4 cl, 2 tbl, 9 ex