After the demolition of concrete structures, it is expected to recycle the whole of the demolished concrete. As of now, however, it is difficult to recycle the fine powders generated in the processes of demolition of concrete and manufacture of recycled aggregate because these powders may contain heavy metals exceeding the soil environmental standard, and such powders are disposed finally. It i...

In this study, the corrosion behavior of Mg-Zn-Se and Mg-Zn-Cu alloys was investigated to evaluate their corrosion behavior related to use as implantable biomaterials. The corrosion behavior of these alloys and a commercially available Mg-Zn alloy were examined using static solution electrochemical testing, dynamic solution gravimetric testing, ion leaching testing, and microscopic evaluation. ...

Using a portable total reflection X-ray fluorescence spectrometer, a sample containing 100 pg each of 3d transition metals, 500 pg of As, and 1 ng each of Sr, Y, and Zr is measured. Although non-monochromatic X-rays from a 5 W X-ray tube (Tube voltage: 25 kV) are used, the trace amounts of these elements are detected. This portable spectrometer is applied to analysis of river water, a leaching ...

After gold recovery using silicon powder from an ammonium thiosulfate leaching solution containing copper（II）sulfate（oxidizing agent for dissolution）, copper was also recovered. a certain period of time, redissolution occurred. Then redissolved. The depletion in the during process leads to redissolution.

Magnesium oxide suitable for the use in basic refractories was prepared from dolomite (CaMg(CO3)2) by hydrochloric acid leaching, precipitation with CO2 and thermal hydrolysis. Leaching of the dolomite ore in aqueous hydrochloric acid solution was investigated with respect to the effects of time on dissolution of the dolomite sample. The dependence of the observed dissolution rate on pH was est...

In the sequence of previous research on the development of novel liquid-liquid amidetype compounds to efficiently and selectively extract platinum-group metals (PGMs) from concentrated hydrochloric acid media, a specific thiodiglycolamide derivative – N,N’dimethyl-N,N’-dicyclohexylthiodiglycolamide (DMDCHTDGA) – has been applied for the recovery of palladium(II) from a spent automobile catalyst...