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Autore principale:	Orlando Belette Fuentes
Natura:	Artículo científico
Lingua:	es
Pubblicazione:	Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Norte 2020
Soggetti:	Ingeniería Secado solar calidad de mena pilas piramidales yacimientos lateríticos
Accesso online:	https://www.redalyc.org/articulo.oa?id=481582835001
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COMPORTAMIENTO DEL SECADO SOLAR DE LATERITAS A LA INTEMPERIE EN CONDICIONES DE CLIMA HÚMEDO TROPICAL Orlando Belette Fuentes Ingeniería Secado solar calidad de mena pilas piramidales yacimientos lateríticos Las plantas niqueleras de tecnología Caron emplean el secado solar para disminuir la humedad de la mena laterítica, reflejado en el procedimiento y equipo para secado solar de materiales a la intemperie metodología de Estenoz y Espinosa (2003). El objetivo de la presente investigación consiste en evaluar el comportamiento del secado solar de lateritas a la intemperie en condiciones de clima húmedo tropical, para disminuir la humedad de la mena laterítica que procesa esta industria. El proceso de secado solar se ensayó, a escala semi-industrial, en pilas piramidales expuestas a la intemperie en condiciones de abundantes precipitaciones. Luego de 7 semanas de remoción, la humedad inicial de 37,75 % se redujo hasta 26,81 %. El trabajo realizado sobre el secado a la intemperie redujo a valores inferiores de $0,09 los costos por tonelada de mineral trasegado en los depósitos mineros de Punta Gorda, Moa, Holguín, Cuba. Se obtuvo un valor promedio de humedad final equivalente a la evaporación del 40 % del agua inicial. Se determinó que para alturas de pilas de 5,5 y 8,5 m se requieren 19 y 17 hectáreas respectivamente, para secar 4,2 millones de masa minera en base húmeda, equivalente a la producción de 30 000 toneladas anuales de níquel. 2020 artículo científico 1518-1634 https://www.redalyc.org/articulo.oa?id=481582835001 es http://www.redalyc.org/revista.oa?id=4815 HOLOS application/pdf Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Norte HOLOS (Brasil) Vol.7

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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