Search results for " mineral"

Caratterizzazione mineralogica e petro-fisica di mattoni in “terra cruda” da un sito del Campidano centro-meridionale

2008

Effect of the mineralogical composition on the elastoplastic hydromechanical response of Opalinus Clay shale

2021

Abstract Opalinus Clay is the shale currently under investigation as the host formation for geological radioactive waste disposal in Switzerland. Its hydromechanical response has been widely studied, and the experimental results show a range of values whose dispersion needs to be clarified. This work aims to explain the dispersion in the literature results by correlating the hydro-mechanical response to the mineralogical variability of the tested specimens . Based on published microstructural studies, the Opalinus Clay shale is herein schematised as a sequence of two kinds of layers: the shaly (high in clay-mineral content) and the sandy (low in clay-mineral content) layers. The mineralogic…

Valorisation of SWRO brines in a remote island through a circular approach: Techno-economic analysis and perspectives

2022

Nowadays, small remote islands rely heavily on desalination technologies to overcome freshwater scarcity. Unfortunately, these technologies are accompanied by the production of brines which can affect the receiving water bodies i.e., the aquatic ecosystem. Yet, it is extremely appealing how such brines constitute an abundant source of valuable raw materials (such as magnesium). In this work, a novel hybrid system is introduced to capture the value of seawater reverse osmosis (SWRO) brines produced in the minor Sicilian island of Pantelleria. The “Minimal Liquid Discharge” (MLD) process consists of: (i) Nanofiltration NF (separation of bivalent from monovalent ions), (ii) Mg Reactive Crystal…

Influence of Operational Strategies for the Recovery of Magnesium Hydroxide from Brines at a Pilot Scale

2022

The continuous depletion of minerals caused by land mining and the increase in their demand have pushed the development of novel sustainable technological processes for mineral recovery from unconventional sources. In this context, magnesium (Mg) has gained considerable attention for its peculiar properties and high relevance of its compounds, such as magnesium hydroxide, Mg(OH)2. In the present work, the influence of several operating conditions on the Mg(OH)2 precipitation process was thoroughly investigated by adopting a novel multiple feed-plug flow reactor. The influence of (i) initial Mg2+ concentrations in the feed stream; (ii) brine and alkaline flow rates; and (iii) the product rec…

Effective magnesium recovery via seawater brines mining

In the last couple of decades, a rising interest has been focused on the research of novel and unconventional sources for mining minerals, such as industrial waste brines. As an example, brines are produced by desalination plants and discharged directly, or after being treated, into receiving water bodies possibly causing environmental concerns and renouncing the possibility to recover minerals [1,2]. Within this framework, the Water Mining WU-H2020 project aims at implementing an advanced Zero Liquid Discharge (ZLD) demo systems for the extraction of minerals and valuables products from industrial waste brines through a circular approach. The ZLD demo plant consists of: (i) Nano Filtration…

Reactive crystallisation process for magnesium recovery from concentrated brines

2014

Seawater brines, generated either by natural or anthropic processes, often cause significant environmental issues related to their disposal. A clear example is the case of brines from desalination plants, which can have severe environmental impacts on the receiving water body. On the other side, brines can represent a rich and appealing source of raw materials, especially when they are very concentrated, as it happens with bitterns (i.e. exhausted brines) produced in saltworks. In particular, magnesium concentration can reach values up to 30-40 kg/m3 of brine, which is 20-30 times that of typical seawater. An experimental campaign has been carried out in the present work for assessing the p…

Le vertigini della materia. Roger Caillois, la letteratura e il fantastico

2017

Il fantastico è la chiave di volta dell’esperienza intellettuale di Roger Caillois. Alla teoria generale del fantastico, alle descrizioni di mirabilia della natura e ai fantasmi delle scritture dell’io sono dedicate le tre sezioni del presente volume. Nella prima parte la famosa definizione cailloisiana del fantastico in arte e in letteratura, «l’irruzione dell’inammissibile all’interno della inalterabile regolarità quotidiana», è interpretata come il nucleo fondativo di un’estetica generale che include il mondo degli animali, alla luce delle contemporanee teorie evoluzioniste, e quello dei minerali, interpretato come l’esempio decisivo per illustrare la legge della dissimmetria che regola …

Osteoporosis, jawbones and periodontal disease

2012

The association between osteoporosis and jawbones remains an argument of debate. Both osteoporosis and periodontal diseases are bone resorptive diseases; it has been hypothesized that osteoporosis could be a risk factor for the progression of periodontal disease and vice versa. Hypothetical models linking the two conditions exist: in particular, it is supposed that the osteoporosis-related bone mass density reduction may accelerate alveolar bone resorption caused by periodontitis, resulting in a facilitated periodontal bacteria invasion. Invading bacteria, in turn, may alter the normal homeostasis of bone tissue, increasing osteoclastic activity and reducing local and systemic bone density …

Reduction of mineral bone density i n patients with non-celiac wheat- and multiple food sensitivity.

2014

BONE MINERAL DENSITY, FRAGILITY FRACTURES AND CLINICAL RISK FACTORS

2018

Osteoporosis affects the skeletal system and is characterized by a reduction in bone strength that predisposes one to an increased risk of fractures. In Italy, about 3.5 million women and 1 million men suffers from osteoporosis. These numbers are set to increase in the coming twenty years because the percentage of the Italian population over 65 will increase by 25%. The purpose of this study is to evaluate the general characteristics of a population of patients suffering from osteoporosis and the relation with comorbidity. A single site, open-label, investigator-initiated, retrospective trial was conducted at the Bone Metabolic Disease Clinic, Department of Physical Medicine and Rehabilitat…