This paper describes a leaching-purifying-precipitation process to recover magnesium from serpentine acid-leaching solution and synthesize high purity Mg(OH)2 4MgCO3·Mg(OH)2·4H2O. Fe, Al, Cr in the leaching were removed using oxidation precipitation method with active MgO as precipitant H2O2 an oxidant. Ni, Co Mn by Na2S obtain pure MgSO4 solution. Mg2+ ions first precipitated NH3·H2O Mg(OH)2, ...

We have synthesized bulk Mg(B1−xCx)2 from a mixture of elemental Mg, B, and the binary compound B4C. Carbon incorporation was dramatically improved by a two step reaction process at an elevated temperature of 1200 C. This reaction process results in a solubility limit near x∼0.07. We found that impurities in the starting B cause an additive suppression of Tc. We combine these data with Tc and H...

The structure of synthetic K2Mg(C03h is trigonal with space group R3m, ao = 5.150(1), Co = 17.290(3) A, Z = 3 and Dx = 2.79 g cm -3, andwas refined to R (unweighted) = 0.057 and R (weighted) = 0.036 using 280non-equivalent reflections. The compound is isostructural with buetschliite,K2Ca(C03h The structure consists of isolated [C03]2 polyhedra (C-O distance 1.283 A), [Mg06] octahedra (Mg0 dista...

In this work firstly Fe3O4 nanoparticles were synthesized via a sono-chemical method. At the second step magnesium hydroxide shell was synthesized on the magnetite-core under ultrasonic waves. For preparation Fe3O4-MgO the product was calcinated at 400 ºC for 2h. Properties of the product were examined by X-ray diffraction pattern (XRD), scanning electron microscope (SEM) and Fourier transform ...