Journal of Progressive Research in Chemistry Journal of Progressive Research in Chemistry en-US (Managing Editor) (Scitech Support) Thu, 10 Sep 2020 00:00:00 +0000 OJS 60 Amenability of heap leaching technology on uranium extraction from Gattar and El Missikat area, Eastern Desert, Egypt: A kinetic approach <p>Studies of uranium heap leaching from different uranium mineralization situated in Eastern Desert of Egypt was investigated via batch experiments, followed by its optimum condition applicationon column percolationtests.The optimum process operating parameters were implemented on large column scale in order to make more condition control and evaluate the time and reagents needed in the large scale. The results show thatleaching efficiency of GIIattained about 78.3% with 34kg/ton acid consumption in a 44 days period, while leaching efficiency of El-Missikat attained about 86.6% with 28kg/ton acid consumption in a 40 days period.Kinetics reaction models of column tests have been investigated to optimize the column leaching behavior. Based on the leaching results of two mineralized samples, the rate of the uranium metal dissolution is controlled by the chemical reaction and the diffusion reaction but diffusion reaction control was more predominate than a chemical reaction control.</p> K F Mahmoud, F A El-Sayed, M S Nagar, W M Morsy, A S Mady, A M Mohamed ##submission.copyrightStatement## Thu, 10 Sep 2020 07:13:37 +0000 Volumetric and Adiabatic Compressibility Behaviour of Aqueous Haemoglobin Solution in Presence of Sugar <p>Measurements of density, ultrasonic velocity were made for investigating the intermolecular interactions. As D- glucose-Haemoglobin–water systems. These systems were chosen due to their vital role in the life of living organisms for such studies. Using density and ultrasonic velocity data, various derived parameters such as adiabatic compressibility (β<sub>s</sub>),&nbsp;&nbsp; compressibility lowering (Δβ<sub>s</sub>), relative change in compressibility (Δβ<sub>s</sub>/β<sub>0)</sub>, apparent molal volume (ф<sub>v</sub>), apparent molal adiabatic compressibility (ф<sub>k</sub>), and partial molal volume (ф<sub>v</sub><sup>0</sup>), of aqueous Haemoglobin solutions in presence of sugar were obtained for each of the concentrations studied in the temperature range: 303.15-328.15k. Temperature dependence of these data suggests the presence of solute-solute, and solute- solvent interactions as well as on the extent of salvation of the protein molecules in presence of sugar. Therefore, by observing a decrease in the compressibility of the solution and the increase in the apparent molal volume of the protein after the addition of sugar, we can say that the extent of denaturation of protein is reduced and its stabilization was taken place.</p> Naseem Ahmad, Sami Ullah Bhat ##submission.copyrightStatement## Sat, 17 Oct 2020 00:00:00 +0000