FIELD: chemistry.
SUBSTANCE: for obtaining cobalt nitrate crystals of high purity spent catalysts Co/SiO2 are calcined in air, cooled and grounded into powder. Said powder is introduced into the reactor with fluidised bed for recovery in the presence of a gas mixture H2 and N2. Excess of diluted nitric acid is added, filtered and cobalt nitrate solution is obtained. Cobalt nitrate solution pH is brought up to 1.5 and oxalic acid solution is added. Then solution is filtered to obtain a precipitate of cobalt oxalate. Molar amount of oxalic acid exceeds by 2-3 times molar amount of cobalt in cobalt nitrate solution. Obtained precipitate is washed, dried and calcined during 4-8 hours at a temperature of 550-650°C to produce cobalt oxide. Cobalt oxide is added with diluted solution of nitric acid to produce second cobalt nitrate solution. It is followed by evaporation and crystallisation of the second cobalt nitrate solution to obtain crystals of Co (NO3)2·6H2O.
EFFECT: invention increases the fraction of extraction and purity of cobalt nitrate.
9 cl, 4 ex
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