Physico-chemical studies on hydrothermal characteristics of calcite-rich clays

Marl-clay deposits containing 30% CaCO3 from Sinai, Egypt, were calcined at different temperatures between 800C to 950C for 30 min. The processed briquettes from these powders were hydrothermally treated at 202C [16 atm] for 4 hours. The evaluation and assessment of the treated specimens were achieved through the determination of their physical properties and the phases developed by XRD, IR- spectroscopy, SEM and chemical analysis. The thermochemistry of these phases were followed using DSC and TG technique. A correlation between the determined properties and the developed phases were also discussed. The results encountered in this investigation indicated that the physical properties of the hydrothermally treated bodies are improved with increasing the precalcination temperature. Also, the data encourage the utilization of this technique [autoclaving] in production of building units from lime-rich clays as is followed in sand lime bricks industry without any additives

Extraction of chromium from electro-plating waste water

This work was carried out to test the feasibility of using tri-iso- octyl-amine for the extraction of chromium from a treated synthetic wastewater which is similar to that produced in industrial electro- plating. The quantity of extracted chromium was large enough to consider the suggested extraction process for its industrial, environmental and economic values. Chromium [3] in the wastewater was oxidized by potassium presulfate into Cr2O7 species. The minimum amount of presulfate necessary to make the oxidation of Cr[3] to Cr[6], prior extraction, was determined using both atomic absorption, in terms of Cr[6], and titrimetric techniques. Also, optimum conditions for chromium extraction, its efficiency at different phase- ratios and stripping of chromium from the organic phase were investigated

Serum-zinc levels in aborted cases with toxoplasmosis and some other diseases

In ninety-eight aborted cases serum-zinc concentration was determined by the AAS, whereas, the toxoplasmosis cases were detected by the haemagglutination test. The correlation between toxoplasmosis as a cause of pregnancy termination and its responsibility for serum zinc disturbancies was discussed. Other chronic diseases revealed a decrease in zinc level