Behavior of Ru and Pd under conditions of electrochemical oxidative dissolution with Ag(II)

Behavior of Ru and Pd under conditions of electrochemical oxidative dissolution in HNO₃ with Ag(II) was studied. Finely divided Ru metal can be readily oxidized and distilled off as RuO₄, with subsequent absorption in an appropriate solvent, within 3–6 h. The process rate is limited by the RuO₄ transport through the solution/gas interface and can be controlled by varying the air flow rate through the system. Anhydrous RuO₂ is not oxidized under these conditions. The possibility of formation of PdO₂·xH₂O in oxidation of Pd(II) with Ag(II) was demonstrated.     

Features of Electrolysis of Nitric Acid Solutions of Silver: I. Behavior of Ag(II) in HNO3 Solutions

The current efficiency of Ag(II) formation in the course of electrochemical oxidative dissolution of PuO₂ was determined. It approaches 72% at the anodic potentials from 1.9 to 2.1 V (vs. SHE) and the anodic current densities of 0.006-0.013 A cm^{- 2}. The behavior of Ag(II) in 4 M HNO₃ at 8, 25, and 40°C was studied. The reaction of Ag(II) with water can be described by the equation d[Ag(II)]/dt = kapp[Ag(II)] ⁿ , where n 2 at 8-25°C and 2-1.5 at 39-41°C. The apparent rate constants of the reaction are 1.5 and 3.8 l mol^{- 1} min^{- 1} at 8.5°C and 25°C, respectively. At 39-41°C, the reaction order with respect to Ag(II) ranges from 2 to 1.5, and the rate constant is about 1.2 l^{1 / 2} mol^{- 1 / 2} min^{- 1}.     

Technology of Blast-Furnace Smelting of Iron using Pulverized Coal at the NLMK

Metallurgist - The problems of using pulverized coal to save coke during iron smelting in the NLMK blast furnaces are considered. The iron smelting technology was implemented in two stages: (i)...     

Efficiency Assessment of Investments in Nuclear Desalination of Seawater

Atomic Energy - An economic/analytical model is proposed for predicting investment efficiency criteria for nuclear desalination of seawater using reverse osmosis technology based on PWR (VVER)...