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SEPARATOR APPARATUS
No full textThe present invention relates to apparatus for separating mixtures of solids of different specific gravities.
For the separation of mixtures of solids of different specific gravities, particularly of mineral particles, there are known separator devices which utilize a dense medium or fluid constituted by a suspension in water of finely ground heavy ' 75 materials, such as ferrosilicon or magnetite, which dense fluid provides a centrifugal field inside a chamber
La funzione dei prerivestimenti in galleria sotto i profili di affidabilità e di sicurezza
No full text
Cylindrical separator apparatus for separating mixtures of solids of different specific gravities, particularly for the mining industry
No full textThis invention relates to a cylindrical separator apparatus for separating mixtures of solids of different specific gravities, particularly for the mining industry. The apparatus according to the invention is formed by a hollow cylindrical body, which is divided by a partition wall into two consecutive chambers communicating with each other through an axial pipe provided in the partition wall. An axial inlet pipe and an axial outlet pipe are provided in the front walls of said chambers opposite to the partition wall. Tangential inlet pipes and tangential outlet pipes are further provided in the vicinity of the partition wall and of the respective front walls of said chamber
VALUATION AND PRODUCTION OPTIMIZATION OF A METAL MINE
No full textA zinc mine, stoped by the room and pillar method, has been evaluated by geostatistical techniques. The computation of the kriging estimator of the average grade of the stoped rooms and the correspondent estimation variance has been carried out in the already exploited mine section. In the other mine section, to be exploited, smaller size blocks have been estimated using the kriging procedure in order to gain some information to define the size and position of the new stoping rooms. The shape of the stoping room top-wall has been defined optimizing the recovered metal tonnage for a fixed cut-off grade. The convex analysis has been used to determine the optimal ′′total recovered metal tonnage vs. total recovered ore tonnage′′ curve, on the basis of the estimates, by the kriging of the stoping rooms subdivided into a large number of small slices
I sistemi di sicurezza nelle aziende esercenti il pubblico trasporto ferroviario in concessione
No full textNelle aziende esercenti il pubblico trasporto ferroviario in concessione tre sono i principali sistemi di sicurezza che il legislatore ha regolamentato con apposite leggi, al fine di assicurare e garantire:
1) la tutela della salute e della sicurezza nei luoghi dilavoro, nei riguardi dei lavoratori (sicurezza dellavoro – Industrial safety);
2) la tutela, la sicurezza e la regolarità del servizio ferroviario nei riguardi degli utenti/viaggiatori e delle merci trasportate (sicurezza dell’esercizio ferroviario – railway transport safety);
3) la tutela del patrimonio aziendale, per preservarlo da comportamenti impropri e fraudolenti (sicurezza del patrimonio aziendale - control system management).
In questo articolo verranno affrontati i primi due punti e le loro interconnessioni
Risk assessment and safety criteria for underground caverns
No full textAssessment of the safety is based on a reliable knowledge and theoretical modeling of both the geology and gee-structure of the site and of the phenomena causing concern. Major considerations are the integrity of the vessel and the potential short and long term impact on the surrounding environment. Therefore, assessment of the risk include the evaluation of ground movements, subsidence, sinkholes, excessive closure, leakage and ground water contamination; General criteria and recommendations based on real case histories are discussed
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