DEVELOPMENT OF A PROCEDURE FOR JOINT DETERMINATION AND SEPARATION OF COBALT AND MOLYBDENUM COMPOUNDS FROM SOLUTIONS

The article is devoted to the scientific problem of joint determination and separation of cobalt and molybdenum compounds in spent catalysts. For the joint extraction of cobalt and molybdenum from the solution in the form of their thiocyanate complexes, a common extractant, acetone, was introduced. A method for the colorimetric determination of these compounds in solutions is proposed. The concentration limits were determined at which the procedure for the joint determination of cobalt and molybdenum is performed. For cobalt - [0.1-2.0] g / l; for molybdenum - above 0.1 g / l. A method is proposed for the isolation of cobalt and molybdenum compounds with a change in the pH of the solution.

EXTRACTION OF CHLORIDE AND THIOCYATE ACIDOCOMPLEXES OF METALS IN SALTING-OUT AGENT – MONOALKYLPOLYETHYLENE GLYCOL – WATER SYSTEMS

Distribution of iron (III), thallium (III, gallium, titanium (IV) chloride complexes in sodium chloride – synthanol DS-10 – water and ammonium sulfate – synthanol DS-10 – water systems, as well as iron (III), cobalt , nickel, cadmium and copper (II) thiocyanate complexes in the ammonium sulfate – synthanol DS-10 – water system investigated. It was found that the main influence on extraction is exerted by solution acidity and nature of the salting-out agent. The conditions for quantitative extraction of thallium (III) and gallium in the form of chloride complexes, as well as the conditions for maximum extraction of iron (III), zinc and cobalt thiocyanate complexes are established.

Thiocyanate complexes of the lanthanides, Am and Cm

The trivalent actinide thiocyanate complexes of Am and Cm are synthesized for the first time along with their lanthanide homologues allowing comparison of the lanthanide and actinide bonding.