1000 resultados para Mina (Sant Adrià de Besòs, Catalonia)


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Most climate change projections show important decreases in water availability in the Mediterranean region by the end of this century. We assess those main climate change impacts on water resources in three medium-sized catchments with varying climatic conditions in north-eastern Spain. A combination of hydrological modelling and climate projections with B1 and A2 IPCC emission scenarios is performed to infer future stream flows. The largest reduction (22-48% for 2076-2100) of stream flows is expected in the headwaters of the two wettest catchments, while lower decreases (22-32% for 2076-2100) are expected in the drier one. In all three catchments, autumn and summer are the seasons with the most notable projected decreases in stream flow, 50% and 34%, respectively (2076-2100). Thus, ecological flows might be noticeably impacted by climate change in the catchments, especially in the headwaters of those wet catchments.

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Acid mine drainage generated from coal mine showed a pH of 3.2, high concentrations of SO4(2-), Al, Fe, Mn, Zn and minor As, Cd, Co, Cr, Cu, Ni and Pb. The major reduction in the concentration occurred for Al, As, Cr, Fe and Pb after the treatment with CaO. The evolution of these acid waters within the tributary stream showed decreasing concentration for all soluble constituents, except Al. This natural attenuation was controlled by pH (6.4 to 10.8) as a result of concurrent mixing with tributary stream and reaction with local bedrock that contains limestone. Aluminum increasing concentration during this evolution seems to be related to an input of Al-enriched waters due to the leaching of silicate minerals in alkaline conditions.

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Estudi estructural per reurbanitzar el carrer Sant Francesc d’Assís de Les Planes, que s’assenta en una configuració de mitja vessant sobre un conjunt triple d’estrats de terreny. Al llarg dels anys s’han produït esllavissaments que han afectat l’àmbit de reblert i algun fins i tot activant els sols quaternaris. La solució proposada és basa en una pantalla curta encastada al substrat rocós, situat al voltant dels 5m. de profunditat, i superiorment lligada per una nova llosa solidària amb l’existent (fregament), però fonamentalment vinculada a un petit mort costat muntanya que, per empenta passiva del terreny, acaba conformant el suport fix de l’esquema estructural en “T”.

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El E.S.S. té com a objectiu establir les bases tècniques per fixar els paràmetres de la prevenció de riscos professionals durant la realització dels treballs d’execució de les obres del Projecte objecte d’estudi, així com complir amb les obligacions que es desprenen de la Llei 31 / 1995 i del RD 1627 / 1997, amb la finalitat de facilitar el control i el seguiment dels compromisos adquirits al respecte per part dels Contractistes.

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L’objecte del projecte és la definició de les obres i valoració pressupostària de consolidació de l’accés al pont de maçoneria sobre els FGC que connecta el camí de Can Gatxet i l’Av. del Carril, dintre de l’actuació general de millora de la mobilitat a l’entorn de la carretera de Vallvidrera en l’encreuament amb els FGC a Sant Cugat del Vallès.

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The mineral waste studied was host rock from a chromite mine located in Andorinha/Bahia, extracted and stockpiled in yards without specific application. Host rock was submitted to chemical analysis, XRD, SEM-EDS, IR and TGA and classified according to ABNT standards for solid waste classification. Analyses confirmed that this host rock, classified as ultrabasic, consists mainly of dolomite, calcite and diopside. Hazard assessment results showed this host rock should be classified as class II B - inert waste, important for its potential application in agriculture as a soil acidity correction agent.

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We report results of the efficiency of tungsten extraction from wolframite concentrate (containing 61.5 wt % WO3) from the Igarapé Manteiga mine (state of Rondônia, Brazil) through acid leaching with strong mineral acids at 100 ºC and 400 rpm for 2-4 h. HCl yielded insoluble matter containing the highest WO3 content (90 wt %). This solid was dissolved in concentrated NH3(aq) at 25 ºC and the insoluble matter filtrated. The filtrate was slowly evaporated. 70 wt % of the tungsten present in the starting concentrate material was recovered as ammonium paratungstate (APT).

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Alussa myös toinen nimiölehti, jossa painovuosi virheellisesti: 1796.

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Alussa myös toinen nimiölehti, jossa painovuosi virheellisesti: 1796.