PROCEDURE FOR PRODUCTION OF PALLADIUM SOLUBLE IN NITRIC ACID Russian patent published in 2011 - IPC C22B11/00 C22B3/44 

FIELD: metallurgy.

SUBSTANCE: procedure for production of palladium soluble in nitric acid consists in reduction of water solution of palladium compound. As source water solution of palladium compound there is used hydrochloric acid water solution of tetra-chlorine-palladium acid evaporated to the beginning of palladium chloride crystallisation (II). Reduction is carried out at 50-110°C with addition of 20-50 % water solution of sodium formate or 20-70 % water solution of ammonia formate, or 70-95 % water solution of formic acid heated to 50-110°C and taken at amount of 110-150 % from mole amount of palladium. Also, reduction is realised when acidity of solution reaches pH 3-5 with addition of 5-15 % of water solution of ammonia.

EFFECT: stability and simplicity of palladium production.

2 cl, 3 tbl, 1 ex