The effect of secondary steelmaking processes such as desulphurization, removal of inclusions and vacuum degassing followed by hot forging and hardening heat treatment on the microstructure and mechanical properties of a hot-work w500 tool steel have been studied in details. In order to follow the progress of secondary steel making, the content of impurity elements such as S, P, O, H and N were...

Sulfur-based autotrophic denitrification is a novel biological process characterized by the absence of an organic carbon source, short reaction time, high rate, low treatment cost, and small footprint. However, technique facing challenges with respect to engineering applications. In this study, pilot-scale sulfur-based system was established optimal hydraulic retention time (HRT) 0.21 h, which ...

the effect of secondary steelmaking processes such as desulphurization, removal of inclusions and vacuumdegassing followed by hot forging and hardening heat treatment on the microstructure and mechanical properties of a hot-work w500 tool steel have been studied in details. in order to follow the progress of secondary steel making, the content of impurity elements such as s, p, o, h and n were ...

Polymer-clay composites were designed to adsorb selenium from water. The highest adsorption efficiency was obtained for chitosan-montmorillonite composites. These composites were characterized by XRD, zeta potential, and FTIR measurements. Adsorption isotherms of selenate on the composite, on Al-oxide and on Fe-oxide were in good agreement with the Langmuir model, yielding a somewhat higher cap...

Hydrogenases are essential for H(2) cycling in microbial metabolism and serve as valuable blueprints for H(2)-based biotechnological applications. However, most hydrogenases are extremely oxygen sensitive and prone to inactivation by even traces of O(2). The O(2)-tolerant membrane-bound [NiFe]-hydrogenase of Ralstonia eutropha H16 is one of the few examples that can perform H(2) uptake in the p...

Geochemical and microbial evidence points to anaerobic oxidation of methane (AOM) likely coupled with bacterial sulfate reduction in the hypersaline groundwater of the Dead Sea (DS) alluvial aquifer. Groundwater was sampled from nine boreholes drilled along the Arugot alluvial fan next to the DS. The groundwater samples were highly saline (up to 6300 mm chlorine), anoxic, and contained methane....

At present, at the metallurgical plants of Ukraine, a charge with an unstable chemical composition is used, which leads to significant fluctuations in temperature, content sulfur, silicon cast iron and decrease technical economic indicators further process production iron-carbon semi-products. The application standard technology step-by-step multi-stage refining from phosphorus increasemelting ...