Magnesium oxysulfate (MOS) cement features potential advantages, including light weight, green and environmental protection, low thermal conductivity, high frost- fire-resistance, but its poor mechanical strength limits the extensive utilization in architectural engineering. In this study, low-cost quartz (Q) was used as a mineral admixture to increase of MOS pastes. The impact filler Q on earl...

New shock wave data on {100 t oriented single crystal periclase covering the pressure range from 160 to 200 GPa suggest that Mg0 is described by a single Hugoniot up to 200 GPa, with no displacive phase transitions of volume change greater than 1-1.5 per cent. For a third order finite strain fit, with K 0 constrained to its ultrasonically determined value of 162.7 GPa, the implied K 0' of 4.27 ...

The system CaO-MgO-SiO2-CO2-H20 is an important model for many igneous and metamorphic processes, including the generation and differentiation of carbonatite and associated silicate magmas. We have experimentally established the vapor-saturated solidus for the system CaO-MgO-CO2-H20 from 595øC/1 kbar to <500øC/40 kbar, about 25øC lower than the corresponding temperatures for the CaOCO•-H•O syst...

Ferropericlase, (Mg,Fe)O, is widely believed to be a major phase in the lower mantle of the Earth, coexisting with Mgrich silicate perovskite, (Mg,Fe,Al)SiO3. Experiments on Mg/Fe partitioning at high pressures suggest that the FeO content in this ferropericlase phase lies in the range 10-20 mol% for potential composition models of the Earth's mantle (e.g. [1]). To date, the elasticity measurem...

Biochar converted from agricultural residues or other carbon-rich wastes may provide new methods and materials for environmental management, particularly with respect to carbon sequestration and contaminant remediation. In this study, laboratory experiments were conducted to investigate the removal of phosphate from aqueous solution by biochar derived from anaerobically digested sugar beet tail...

Ahstraet--Hydrotalcite solid solutions were prepared by coprecipitation followed by hydrothermal treatment between 150 ~ and 250~C. Based on the structural formula [Mgl_xAlx(OH)~lX+l(COz)x/2 9 mH20] x-, pure solid solutions were formed in the range Al/(Al + Mg) = 0.2 to 0.33, where m = (1 3x/2). Maximum crystallite size was achieved by hydrothermal treatment between 180 ~ and 200~ with x = 0.33...

We investigate the influence on mantle convection of the negative Clapeyron slope ringwoodite to perovskite and ferro-periclase mantle phase transition, which is correlated with the seismic discontinuity at 660 km depth. In particular, we focus on understanding the influence of the magnitude of the Clapeyron slope (as measured by the Phase Buoyancy parameter, P ) and the vigour of convection (a...

The physics of mineral grain sliding, which occurs upon dynamic compression of rocks, is investigated by shock loading single crystals of corundum (A1203) and periclase (MgO) in contact obliquely in impact experiments. Energy dispersive X-ray analysis and X-ray diffraction studies of samples recovered from 26 36 GPa, 800 ns experiments indicated that under certain conditions a spinel phase of c...

With the raw materials for ironmaking becoming increasingly complex, more accurate phase equilibrium information on slag is needed to refine blast furnace operation reduce energy cost and CO2 emissions. CaO-SiO2-Al2O3-MgO a basic system of in which CaO MgO mainly come from flux, SiO2 Al2O3 are materials. The effect flux additions can be described by pseudo-ternary CaO-MgO-(Al2O3+SiO2) at fixed ...