University of Huelva posted this:New procedure for the purification of water contaminated by metals and the respective systemsThe invention solves the problems of inefficiency which usually shows the conventional passive treatment systems. The reactive fills developed for the removal of inorganic contaminants historically have focused on removing low concentrations of these (typical features of coal mining), however when these fillers are faced to high concentrations of metals (sulfur mining, uranium, industrial water waste…) quickly clogging and loss of reactivity occurs. The present invention allows the removal of metals without clogging and/or loss of reactivity. This is achieved by the use of a coarse inert material with high surface mixed with a fine-grained reactive material, so that the surface of the inert material is breaded with reactive material. Coarse fragments of inert material act as a frame, providing large pores that reduces clogging by precipitates. The small particle size of the reactive material provides a large surface area that increases its reactivity.
University of Huelva posted this:Procedure for obtaining a renewable resource of metals from acid minewater, and the respective systemsIs known in the state of the art the recovery of metals from the acid aqueous solution that contain them, generally by liquid-liquid extractions. For metals recovery at industrial scale is necessary that these metals can be recovered simultaneously by means of a single extraction step. There are several extraction reagent for this purpose, all these reagent are very expensive and the industrial process for the metal recovery (particularly for rare earth and yttrium) are very complex and finally expensive. The present procedure allows to recovery selectively metals (particularly rare earths and yttrium) by the neutralization of acid mine waters. The objective is to revalue the metal content dissolved in this waters.
UATEC - Unidade de Transferência de Tecnologia posted this:Tungsten carbide based composite material, the appropriate method of production and applicationThe preferential production method of the composite material involves the sputtering for the modification of the particle surface by coating them with a nanocrystalline layer of iron-rich metallic binder with variable thickness. The rest of the processing follows the traditional powder metallurgy routes with pressing and sintering in a vacuum furnace. After processing, the composite contains tungsten carbide phase, eta-phase and iron rich binder.