CERIUM EXTRACTION METHOD Russian patent published in 2013 - IPC C22B59/00 C22B3/10 B01J23/10 

FIELD: metallurgy.

SUBSTANCE: cerium extraction is performed after preliminary preparation of a catalyser. Crushing of the used catalyser is performed. Crushed catalyser is subject to annealing at the temperature of 650-800°C during 3-6 hours. After annealing the catalyser is cooled down to room temperature and cerium compound is extracted by dilution of ignited catalyser in concentrated hydrochloric acid. Obtained solution with suspended particles of cerium dioxide is heated to boiling, exposed at boiling temperature of 100-110°C during 30-120 minutes and during 3-12 hours at temperature of 0-20°C so that a deposition is obtained. The obtained deposition is separated from mother solution by means of filtration by draining the solution from the deposition surface to a filter with the size of filtering material pores of not more than 2 mcm. Deposition on the filter is washed from iron compound and dried till constant weight of cerium dioxide.

EFFECT: extraction of cerium with high purity by eliminating mutual influence of extracted components on each other.

2 cl, 1 dwg, 1 tbl, 11 ex