FIELD: production of metals of platinum group by refining. SUBSTANCE: nitrite solution is heated at temperature being higher that its boiling point, the process is carried out in autoclave. These conditions are favorable for complete substitution all the ligands from inside zone of iridium complexes with nitrite ions. By extraction iridium desired hexanitroiridate of sodium and ammonium is prepared. EFFECT: increased degree of extraction of iridium, decreased expense of reagents and energy expense. 3 cl, 1 tbl
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