METHOD OF PRODUCING HYDRATE OF METAL OXIDE Russian patent published in 2009 - IPC C01F7/02 C01G23/04 C01G25/02 

FIELD: chemistry.

SUBSTANCE: method of producing a hydrate of a metal oxide involves treatment of a metal salt with ammonia gas, separation of hydrate residue from the suspension with formation of a solution which contains an ammonium salt, washing the hydrate residue and drying. The metal salt used is an aluminium, titanium or zirconium salt in form of crystalline hydrates with particle size of 0.1 to 3.0 mm. Metal salts are treated with ammonia gas by passing ammonia gas through a layer of particles of crystalline hydrates until pH of aqueous extraction of the reaction mass of not less than 7. The obtained reaction mass is leached with water or a solution from washing the hydrate residue with formation of a suspension, from which the hydrate residue is separated.

EFFECT: obtaining an end product with low water content, reduced volume of material movement and energy consumption of the process, increased complexity of using raw materials and environmental friendliness.

7 cl, 10 ex