Magnetofluidization of fine magnetite powder

Microwave synthesis of phase-pure, fine silicon carbide powder

Fine, monophasic silicon carbide powder has been synthesized by direct solid-state reaction of its constituents namely silicon and carbon in a 2.45 GHz microwave field. Optimum parameters for the silicon carbide phase formation have been determined by varying reaction time and reaction temperature. The powders have been characterized for their particle size, surface area, phase composition (X-r...

Settling characteristics of coal washery tailings using synthetic polyelectrolytes with fine magnetite

In the coal preparation plant, the run of mine coal undergoes a series of operations, including washing, wet screening, sedimentation and dewatering. The process requires the circulation of large volumes of water from which large volumes of waste water containing a variety of solid particles are generated. Clarification of the tailing water is often carried out in a thickener by adding suitable...

Oxidation of Magnetite Nanoparticles

DAFS analysis of magnetite.

The mechanism of the structural transformation in Fe304 during its Verwey transition at 120 K is not completely understood, partly due to the lack of knowledge of the details of the local structure around different Fe atoms in the unit cell. In our experiment, this information was obtained at room temperature using Diffraction Anomalous Fine Structure (DAFS) technique which has the ability to s...

Production of fine Nd-Fe-B alloy powder by pulsed plasma atomization

Extremely fine (<10 μm) Nd-Fe-B powder was generated by pulsed plasma atomization processing. The number average was just over 3 μm, as determined by computer-assisted scanning electron microscopy analysis of almost 3000 particles. Despite the fine particle size, alloys of stoichiometric Nd2Fe14B resulted in the properitectic formation of -Fe, deleteriously affecting the magnetic properties. N...