ELECTROCHEMICAL METHOD OF PRODUCING ALUMINIUM HYDROXIDE Russian patent published in 2011 - IPC C01F7/42 C25B1/16 

FIELD: chemistry.

SUBSTANCE: invention relates to production of aluminium hydroxide from aluminium metal, which can be used as a modifying additive for polymer materials for producing active aluminium oxide for making extra strong and fire resistant ceramic articles, composite materials and antipyrenes. The electrochemical method of producing aluminium oxide involves anodic dissolution aluminium metal in a chlorine-containing electrolyte solution, followed by washing and thermal treatment. Anodic dissolution is carried out in a coaxial electrolysis cell with the surface area of the anode at least twice greater than that of the cathode and the precipitate is then held in the electrolyte solution. Concentration of chloride in the electrolyte solution is equal to 0.05-0.8 mol/l and anode current density is equal to 50-300 A/m².

EFFECT: invention enables to control the phase ratio of boehmite and bayerite and obtain aluminium hydroxide nanoparticles with size in the range of 10-200 nm.

1 dwg, 2 tbl, 4 ex, 1 dwg