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[en] It starts with applicability. Next it tell about setting regulation of allowable stress in general examination, allowable stress of steel material and nonferrous metals and allowable stress of blot material. It has three charts of the text.
[en] The alkaline calcination process of goethite, was tested in order to extract chromium and aluminium prior to the use of Caron's ammonia-leachinh process for nickel extraction from laterites. It was found that the reaction product of goethite with sodium carbonate was the β modification of sodium ferrite which leads to ultrafine particle hematite in the aqueous leaching process. (author)
[en] We report the lithium insertion into a copper iron oxyborate, i.e. Cu2FeBO5. Four electrons are involved in the course of the first discharge, which is ascribed to the Cu2+/Cu redox couple. The reaction is associated with a collapse of the structure but this material shows a reversible and stable capacity of 180 mAh/g at 2.35 V vs. Li+/Li. - Graphical abstract: Electrochemical activity of copper iron oxyborate Cu2FeBO5 toward lithium, leading to a reversible capacity of 180 mAh/g at 2.35 V versus Li+/Li. Display Omitted
[en] The aim of this work was to assess the uptake of Fe(II) by extracellular polymeric substances (EPS) from the acidophilic bacterium Acidiphillium 3.2Sup(5). These EPS were extracted using EDTA. EPS of A. 3.2Sup(5) loaded in sorption tests with Fe(II), were characterized using the following experimental techniques: scanning electron microscopy (SEM) with energy dispersive X-ray microanalysis (EDX), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The experimental results indicate that EPS adsorb ferrous iron according to Freundlich model with a metal sorption uptake of K = 1.14 mg1−1/n L1/n g−1 and a sorption intensity of 1/n = 1.26. In addition, ferrous iron sorption by EPS took place by preferential interaction with the carboxyl group which promotes the formation of ferrous iron oxalates (FeC2O4). Since the interaction reaction was reversible (Log K = 0.77 ± 0.33), that means that the cation sorption can be reversed at convenience. (Author)