The paper deals with experimental design and optimization of leaching process of uranium and associated metals from low-grade, Polish ores. The chemical elements of interest for extraction from the ore were U, La, V, Mo, Yb and Th. Sulphuric acid has been used as leaching reagent. Based on the design of experiments the second-order regression models have been constructed to approximate the leac...

Several options for designing fast reactors to operate in the Breed-and-Burn (B&B) mode are compared and a strategy is outlined for early introduction of B&B reactors followed by a gradual increase in the fuel utilization of such reactors. In the first phase the fast reactor core will consist of a subcritical B&B blanket driven by a relatively small critical seed. As the required discharge burn...

[1] To better inform the subsurface scientist on the expected performance of parallel simulators, this work investigates performance of the reactive multiphase flow and multicomponent biogeochemical transport code PFLOTRAN as it is applied to several realistic modeling scenarios run on the Jaguar supercomputer. After a brief introduction to the code's parallel layout and code design, PFLOTRAN's...

Uranium (U) and plutonium (Pu) are the two actinide elements most likely to occur as contaminants in the environment. Pu will occur only in a few localized areas associated with weapons production and processing such as Hanford, Rocky Flats and INEEL, and as a result of a very small number of releases from reactor sites such as Sellafield, Kyshtym and Chernobyl. On the other hand, U occurs at m...

The percolation technique was used to examine the leachability of uranium from El-Sela mineralization. agglomeration effect, particle size, flow rates, free acidity, solid/liquid ratio, and ratio cobblestone effect were all studied in kinetics leaching. At a height 3.0 m within column, optimal ore found be 1:4, irrigation rate reduced 0.15 0.1L/m2/min, increasing 47.5 79%. Finally, column leach...

the eocene volcanic rocks from the southwest of the jandaq (kuh-e-godar-e-siah, central-east iran micro-continent) are andesitic basalt and andesite in composition. these rocks contain xenoliths with granulitic mineralogy. mineral assemblage of these xenoliths is plagioclase + phlogopite + corundum + sillimanite + chlorite + phengite with granublastic, poiklioblastic and foliated textures in th...

The article presents data on the analysis of U accumulation in recent sediments lakes territory Southeast Fennoscandia. research was carried out study area Republic Karelia. It has been established that content varies from 0.1 to 42.3 mg/kg (median is 0.91 mg/kg). In general, studied region had low concentrations comparison with average this element upper part Earth’s crust. some areas associat...