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Predicting the vibration of the circular sawing machine is very important in examining the performance of the sawing process, as it shows the amount of energy consumption of the circular sawing machine. Also, this factor is directly related to maintenance cost, such that with a small increase in the level of vibration, the maintenance cost increases to a large extent. This paper presents new prediction models to assess the vibration of circular sawing machine. An evaluation model based on the imperialist competitive algorithm as one of the most efficient artificial intelligence techniques was used for estimation of sawability of the dimension stone in carbonate rocks. For this purpose, four main physical and mechanical properties of rock including Schimazek’s F-abrasivity, uniaxial compressive strength, mean Mohs hardness, and Young’s modulus as well as two operational parameters of circular sawing machine including depth of cut and feed rate, were investigated and measured. In the predicted model, the system vibration in stone sawing was considered as a dependent variable. The results showed that the system vibration can be investigated using the newly developed machine learning models. It is very suitable to assess the system vibration based on the mechanical properties of rock and operational properties.
Reza Mikaeil; Mojtaba Mokhtarian; Sina Shaffiee Haghshenas; Nicola Careddu; Aref Alipour. Assessing the System Vibration of Circular Sawing Machine in Carbonate Rock Sawing Process Using Experimental Study and Machine Learning. Geotechnical and Geological Engineering 2021, 1 -17.
AMA StyleReza Mikaeil, Mojtaba Mokhtarian, Sina Shaffiee Haghshenas, Nicola Careddu, Aref Alipour. Assessing the System Vibration of Circular Sawing Machine in Carbonate Rock Sawing Process Using Experimental Study and Machine Learning. Geotechnical and Geological Engineering. 2021; ():1-17.
Chicago/Turabian StyleReza Mikaeil; Mojtaba Mokhtarian; Sina Shaffiee Haghshenas; Nicola Careddu; Aref Alipour. 2021. "Assessing the System Vibration of Circular Sawing Machine in Carbonate Rock Sawing Process Using Experimental Study and Machine Learning." Geotechnical and Geological Engineering , no. : 1-17.
The purpose of this research is to show how to reduce the amount of landfilled marble waste/scraps by collecting and re-purposing the marble microfine sawdust, which is produced after the sawing and processing of carbonate dimension stones. Our ultimate goal is to identify alternative uses, rather than landfilling. The current solution so far preferred - landfill - does not fully meet sustainable development criteria. Our reduction strategy is based on a regulatory framework which identifies waste, by-product and end of waste status clearer. After a careful characterization, the marble sawdust can be reused and marketed for industrial applications, that employ micronized calcium carbonate, as a new material. During the first few years of study, the research focused on the construction industry (i.e. concrete – plaster - brick), by assessing the extensive use of marble sludge. The building industry is able to incorporate and reuse waste materials deriving from different industries, although, in this way, such material would be regarded as of poor quality. The current trend is to add high economic value to this waste. Since product specifications for calcium carbonate vary depending on its application, a comparison with the paper - rubber - and tyre calcium carbonate requirements is described herein and, in addition, the final results of the tests carried out on marble sawdust in tyre mixtures are also reported in detail.
Graziella Marras; Augusto Bortolussi; Giampaolo Siotto; Marco Surraco; Nicola Careddu. Reduction of Marble Waste Landfills through the Enhancement of CaCO3. Key Engineering Materials 2020, 848, 145 -153.
AMA StyleGraziella Marras, Augusto Bortolussi, Giampaolo Siotto, Marco Surraco, Nicola Careddu. Reduction of Marble Waste Landfills through the Enhancement of CaCO3. Key Engineering Materials. 2020; 848 ():145-153.
Chicago/Turabian StyleGraziella Marras; Augusto Bortolussi; Giampaolo Siotto; Marco Surraco; Nicola Careddu. 2020. "Reduction of Marble Waste Landfills through the Enhancement of CaCO3." Key Engineering Materials 848, no. : 145-153.
Sardinia (Italy) produces a vast array of natural stones for ornamental use. Besides the internationally known pink and gray granites and the famous limestone known as Orosei marble, a wide range of vulcanites (basalts and “trachytes”) and phyllites - including yellow and ghiandone granites - are also produced. Orosei marbles are some of the most requested types today, which are marketed especially to China. However, there are a number of Sardinian natural stones, which have been quarried and marketed for fifty years, although no image or footage has been published yet: a mention of this natural stones has been only made in some old list of Sardinian stones. For this reason, authors suggested the publication of a poster (70 cm x 100 cm) showing a collection of natural stones quarried for ornamental purposes in Sardinia over the last fifty years. The poster includes a user-friendly map that has been adapted for school use and as a public resource in libraries. There are no previous publications showing a similar wide range of Sardinian stones. The poster offers scientific information about lithology, quarrying sites, dimension stone producing areas, quarries of historical and/or archaeological interest, historical trend in quarries output, technical properties, stone surface workability and a glossary.
Nicola Careddu; Massimo Scanu; Paolo Desogus. Notes on the Poster “Map of Natural Stones from Sardinia (Italy)”. Key Engineering Materials 2020, 848, 127 -136.
AMA StyleNicola Careddu, Massimo Scanu, Paolo Desogus. Notes on the Poster “Map of Natural Stones from Sardinia (Italy)”. Key Engineering Materials. 2020; 848 ():127-136.
Chicago/Turabian StyleNicola Careddu; Massimo Scanu; Paolo Desogus. 2020. "Notes on the Poster “Map of Natural Stones from Sardinia (Italy)”." Key Engineering Materials 848, no. : 127-136.
Due to the ever-growing public concern about radon risk arising from building materials, the radon exhalation rates and the natural radioactivity of eighteen dimension stones mostly used in Sardinia and widely exported worldwide have been estimated by means of laboratory tests. Some of the quarrying companies that operate within the Sardinian territory provided the samples to be tested, which include twelve granitoids, four pyroclastic rocks and two basalts. The Activity Concentration Index (Iɤ), the External Radiation Hazard Index (Hex) and the Radium equivalent activity (Raeq) were calculated for each rock sample under investigation, based on the estimated values of 222Rn exhalation rate and 226Ra, 232Th and 40K radioactivity concentration. A poor correlation between radon release rates and 226Ra radioactivity concentrations was found. The contribution to indoor radon accumulation was also simulated for the stone with the highest 222Rn exhalation rate and the resulting concentration compared with the limit value establish by the 2013/59/Euratom Directive. These findings can be extended to rocks formed in similar geodynamic settings that are likely to produce igneous rocks with similar petrographic and geochemical features.
Valentina Dentoni; Stefania Da Pelo; Mirsina Mousavi Aghdam; Paolo Randaccio; Alfredo Loi; Nicola Careddu; Alessandra Bernardini. Natural radioactivity and radon exhalation rate of Sardinian dimension stones. Construction and Building Materials 2020, 247, 118377 .
AMA StyleValentina Dentoni, Stefania Da Pelo, Mirsina Mousavi Aghdam, Paolo Randaccio, Alfredo Loi, Nicola Careddu, Alessandra Bernardini. Natural radioactivity and radon exhalation rate of Sardinian dimension stones. Construction and Building Materials. 2020; 247 ():118377.
Chicago/Turabian StyleValentina Dentoni; Stefania Da Pelo; Mirsina Mousavi Aghdam; Paolo Randaccio; Alfredo Loi; Nicola Careddu; Alessandra Bernardini. 2020. "Natural radioactivity and radon exhalation rate of Sardinian dimension stones." Construction and Building Materials 247, no. : 118377.
This paper presents the results of the study of the change in colour of the Ghiandone granite, which is typically used for ornamental purposes, and of all its mineral constituents, whenever undergoing different surface finishings. Changes in roughness as well as gloss were recorded, and put in relation to CIE colour parameters. The study was carried out by using a spectrophotometer, in order to measure the colour coordinates in CIE L*a*b* and CIE L*C*h colour spaces of those stone samples which have been treated following traditional methods (i.e. polishing, bush-hammering and flaming) and advanced technologies (i.e. pure water-jet and abrasive water-jet); sawplane surfaces (from traditional gangsaw and diamond disk) were also considered in this study. The results show that lightness (L*) is the colour coordinate that experiences a higher variation when different surface finishings are applied, especially bush-hammering. In the CIE L*C*h colour space, polished and pure water-jet finished samples are characterized by higher chroma values than the others samples which are featured by higher lightness. Hue doesn't show any significant variation. When the total colour difference (ΔE*) is measured, pure water-jet also preserves the original colour of stone and minerals, similarly to the polishing. An inverse correlation between specular gloss values and mean average roughness have been documented.
Nicola Careddu. Chromaticism differentiations: A study of the diversified aesthetic appeal of the Ghiandone granite range. Journal of Building Engineering 2020, 30, 101300 .
AMA StyleNicola Careddu. Chromaticism differentiations: A study of the diversified aesthetic appeal of the Ghiandone granite range. Journal of Building Engineering. 2020; 30 ():101300.
Chicago/Turabian StyleNicola Careddu. 2020. "Chromaticism differentiations: A study of the diversified aesthetic appeal of the Ghiandone granite range." Journal of Building Engineering 30, no. : 101300.
Nicola Careddu; Giuseppe Di Capua; Giampaolo Siotto. Dimension stone industry should meet the fundamental values of geoethics. Resources Policy 2019, 63, 1 .
AMA StyleNicola Careddu, Giuseppe Di Capua, Giampaolo Siotto. Dimension stone industry should meet the fundamental values of geoethics. Resources Policy. 2019; 63 ():1.
Chicago/Turabian StyleNicola Careddu; Giuseppe Di Capua; Giampaolo Siotto. 2019. "Dimension stone industry should meet the fundamental values of geoethics." Resources Policy 63, no. : 1.
Sardinia was affected by an intense igneous activity which generated calc-alkaline products during the Oligo-Miocene period. The volcanic substance shows large variations, ranging from pyroclastic flow deposits, lava flows and domes. By composition, the deposits are all primarily dacites and rhyolites, with subordinate andesites and very scarce basalts. The rhyolite lavas show porphyritic and ash-flow tuffs. Ignimbrite structures are found in the dacitic domes and rhyolitic lavas. These rocks—commercially known as “Trachytes of Sardinia”—used to be quarried in all historical provinces, mainly in the central part of the island to be used as ornamental and building stone. They continue to be commonly used nowadays, but their use dates back to the prehistoric age. They are easily found in many nuraghi, “domus de janas”, holy wells, Roman works (mosaics, paving, roads, bridges), many churches built in Sardinia and practically in all kinds of structural elements in public and private buildings, such as walls, houses, and bridges. Contrary to the granitoid rocks, whose appearance is largely influenced by the mineralogical composition, the aesthetic feature of volcanic rocks is rather affected by the widest range of colors, structure and texture, i.e., shape, size and distribution of mineral components, porphyric index, etc. “Trachyte” is quarried opencast with the “single low step” method, with descending development, with prevalent use of double-disc sawing machines. Whenever the stone deposit allows higher steps, the chain cutting machine, in combination with diamond wire, becomes the preferred extraction solution. This study aims to at look Sardinian “trachytes” from a geoheritage perspective. After a geological-petrographic framework, the paper discusses the historical uses of “trachyte” in Sardinia. The current state of the art of “trachyte” quarrying, processing and usage in the Island is also described. An analysis of the “trachyte” production has been carried out. Finally, a consideration about how to enhance geotourism in the area is suggested.
Nicola Careddu; Silvana Maria Grillo. “Trachytes” from Sardinia: Geoheritage and Current Use. Sustainability 2019, 11, 3706 .
AMA StyleNicola Careddu, Silvana Maria Grillo. “Trachytes” from Sardinia: Geoheritage and Current Use. Sustainability. 2019; 11 (13):3706.
Chicago/Turabian StyleNicola Careddu; Silvana Maria Grillo. 2019. "“Trachytes” from Sardinia: Geoheritage and Current Use." Sustainability 11, no. 13: 3706.
Nicola Careddu. Dimension stones in the circular economy world. Resources Policy 2019, 60, 243 -245.
AMA StyleNicola Careddu. Dimension stones in the circular economy world. Resources Policy. 2019; 60 ():243-245.
Chicago/Turabian StyleNicola Careddu. 2019. "Dimension stones in the circular economy world." Resources Policy 60, no. : 243-245.
The problem of the large amounts of waste products deriving from ornamental stone industrial activities affects not only the environmental impact but also the resources maintenance and the problem of waste management. This paper presents the essential features of an environmentally attractive reuse of what is currently considered a marble waste: marble sludge, recovered from marble sawing and slurry processing. A research is currently carried out in order to join this by-product with possible industrial applications. Simplified rubber formulations, filled with dewatered marble sludge and cross-linked by vulcanization, have been investigated with the objective of making a comparison with tyre compound obtained by using commercial calcium carbonate filler. From this, rigorous analyses have been carried out. The structural effect of calcium carbonate particles on tyre mixtures tensile strength, hardness, rheometric and morphological properties was inspected. The investigation focused on the materials collected by Orosei marble producing area (NE Sardinia - Italy) and it was carried out in cooperation with the Research & Development Laboratory by Marangoni Spa (Italy). The data emerging from the tests demonstrate how environmental burdens in conjunction with stone production could be reduced to much lower levels, by identifying the way to use marble sludge as filler in high added value products
Graziella Marras; Nicola Careddu. Sustainable reuse of marble sludge in tyre mixtures. Resources Policy 2018, 59, 77 -84.
AMA StyleGraziella Marras, Nicola Careddu. Sustainable reuse of marble sludge in tyre mixtures. Resources Policy. 2018; 59 ():77-84.
Chicago/Turabian StyleGraziella Marras; Nicola Careddu. 2018. "Sustainable reuse of marble sludge in tyre mixtures." Resources Policy 59, no. : 77-84.
Globalization, growth in consumption levels and emerging economies such as China and India has led to increasing concerns about the availability of specific mineral raw materials. These resources are finite and rapidly depleting; in the meantime, demand continues to increase. This results in the overall increase in the value of mineral raw material and in the subsequent dramatic price spikes and fluctuations. Therefore, resource security is now a priority for governments of developed countries. The security of supply of the so-called ‘critical’ raw materials (CRM), with rare earths (REE) has attracted the greatest attention in the press. The “criticality” concept is based on the combination of economic importance and supply risk for the Mineral Raw Materials (MRM). The EU relies on extra European countries for the vast majority of their critical raw materials (CRM) supply, putting manufacturing and industrial activities within the EU at risk and causing high economic dependence on non-EU countries. On the other hand, these factors drive a need for new sources of mineral raw materials, and, on the other, a need for the EU to reduce its reliance on global imports of such materials and to become more independent.
Nicola Careddu; Giovanna Antonella Dino; Svein Willy Danielsen; Richard Přikryl. Raw materials associated with extractive industry: An overview. Resources Policy 2018, 59, 1 -6.
AMA StyleNicola Careddu, Giovanna Antonella Dino, Svein Willy Danielsen, Richard Přikryl. Raw materials associated with extractive industry: An overview. Resources Policy. 2018; 59 ():1-6.
Chicago/Turabian StyleNicola Careddu; Giovanna Antonella Dino; Svein Willy Danielsen; Richard Přikryl. 2018. "Raw materials associated with extractive industry: An overview." Resources Policy 59, no. : 1-6.
Commercial basalt that is quarried in Sardinia is a natural resource which is the result of extensive volcanic activity during the Pliocene and Pleistocene ages, following the opening of the Campidano plain and Tyrrhenian Sea rift, when large volumes of basalt and andesite rock naturally moulded extensive areas of the Island. An example is provided by the “Giare” tablelands and several other large plateaus located in central Sardinia. Basalt has formed in many other areas of the Island, where a vast array of monuments dating back to the II–I millennium B.C. document the high workability, durability, and withstanding to weathering of basalt. The complex of circular defensive towers, known as “Su Nuraxi di Barumini” was included in the World Heritage List by UNESCO in 1997. Basalt is currently produced locally, and it is used for architectural and ornamental purposes. It is quarried from stone deposits or mined from huge boulders which are mechanically moved and sawn and then transported and manufactured in plants which are located in various sites throughout the Island. The paper begins with a historical introduction and then focusses on the current state-of-the-art of Sardinian basalt quarrying, processing, and usage. An analysis of the basalt market has been carried out.
Nicola Careddu; Silvana Maria Grillo. Sardinian Basalt—an Ancient Georesource Still En Vogue. Geoheritage 2018, 11, 35 -45.
AMA StyleNicola Careddu, Silvana Maria Grillo. Sardinian Basalt—an Ancient Georesource Still En Vogue. Geoheritage. 2018; 11 (1):35-45.
Chicago/Turabian StyleNicola Careddu; Silvana Maria Grillo. 2018. "Sardinian Basalt—an Ancient Georesource Still En Vogue." Geoheritage 11, no. 1: 35-45.
Nicola Careddu; Alessandro Mazzella; Sara Dessì. Surface processing of stone by water-jet: assessment of the minerals’ luster and comparison with traditional technologies. Episodes 2017, 40, 304 -314.
AMA StyleNicola Careddu, Alessandro Mazzella, Sara Dessì. Surface processing of stone by water-jet: assessment of the minerals’ luster and comparison with traditional technologies. Episodes. 2017; 40 (4):304-314.
Chicago/Turabian StyleNicola Careddu; Alessandro Mazzella; Sara Dessì. 2017. "Surface processing of stone by water-jet: assessment of the minerals’ luster and comparison with traditional technologies." Episodes 40, no. 4: 304-314.
Nowadays calcium carbonate has a great importance in different industrial fields and currently there is the opportunity of appreciate the potential value of marble waste and convert it into marketable products. Marble slurry samples, collected from different dimension stone treatment plants in Orosei marble district (Sardinia - Italy), were chemically, physically, mineralogically, and morphologically analyzed and the obtained data were evaluated for compatibility with the marketable micronized CaCO3 specifications required by some industrial sectors, estimating the prospects of recovered CaCO3 utilization. Besides the economic benefits, transforming a waste into an important economic resource involves environmental advantages, due to reduced marble waste landfills, and sustainability promotion
Graziella Marras; Augusto Bortolussi; Roberto Peretti; Nicola Careddu. Characterization methodology for re-using marble slurry in industrial applications. Energy Procedia 2017, 125, 656 -665.
AMA StyleGraziella Marras, Augusto Bortolussi, Roberto Peretti, Nicola Careddu. Characterization methodology for re-using marble slurry in industrial applications. Energy Procedia. 2017; 125 ():656-665.
Chicago/Turabian StyleGraziella Marras; Augusto Bortolussi; Roberto Peretti; Nicola Careddu. 2017. "Characterization methodology for re-using marble slurry in industrial applications." Energy Procedia 125, no. : 656-665.
The market interest in ornamental rocks commercially referred to as “stones” has grown significantly in recent years, particularly regarding basalt. This has resulted in the widespread use of diamond wire equipped with sintered diamond beads for precision sawing in basalt quarries, especially those located in the industrialized countries; it also has the advantage of preventing rock damages. Diamond wire has been widely used in up-line cutting and other sawing works in both marble and granite quarries for decades; therefore, performance data about the use of this tool on these two different types of rocks are widely documented in academic literature. However, for basalt sawing, information pertaining to the use of diamond wire is unavailable due to various reasons, but mostly because of to its relatively recent introduction in the basalt quarries and also to the historical low market demand for processed basalt in the past. This study offers a possible solution to this lack of information and provides a technical, economic and environmental assessment of diamond wire used in quarrying basalt for ornamental purposes. After an overview on the state of the art of diamond wire and on the final use of processed basalt, the study describes the experimental plan and the results. These show a tool yield much higher than those measured when diamond wire is used on other silicate dimension stones (e.g. granites). Moreover, the composition of basalt sawdust (sludge) has been analysed in the laboratory and has indicated the absence of polluting materials related to tool wear; therefore, basalt sludge, which is made of water and micronized basalt, can be used as a secondary raw material for the environmental restoration of the area or for any other purpose. Further research on other lithotypes is also proposed.
Nicola Careddu; Elisa Stefania Perra; Orietta Masala. Diamond wire sawing in ornamental basalt quarries: technical, economic and environmental considerations. Bulletin of Engineering Geology and the Environment 2017, 78, 557 -568.
AMA StyleNicola Careddu, Elisa Stefania Perra, Orietta Masala. Diamond wire sawing in ornamental basalt quarries: technical, economic and environmental considerations. Bulletin of Engineering Geology and the Environment. 2017; 78 (1):557-568.
Chicago/Turabian StyleNicola Careddu; Elisa Stefania Perra; Orietta Masala. 2017. "Diamond wire sawing in ornamental basalt quarries: technical, economic and environmental considerations." Bulletin of Engineering Geology and the Environment 78, no. 1: 557-568.
Nicola Careddu; Giampaolo Siotto; Graziella Marras. The crisis of granite and the success of marble: errors and market strategies. The Sardinian case. Resources Policy 2017, 52, 273 -276.
AMA StyleNicola Careddu, Giampaolo Siotto, Graziella Marras. The crisis of granite and the success of marble: errors and market strategies. The Sardinian case. Resources Policy. 2017; 52 ():273-276.
Chicago/Turabian StyleNicola Careddu; Giampaolo Siotto; Graziella Marras. 2017. "The crisis of granite and the success of marble: errors and market strategies. The Sardinian case." Resources Policy 52, no. : 273-276.
Residual sludge coming from dimension stone working activities represents a serious environmental and economic problem for both stone industry and community. Indeed, most of the time, residual sludge is landfilled because of the difficulties to recover it; such difficulties are mainly connected to local legislation and to a lack of proper protocols. In general, two different categories of sludge can be identified: residual sludge coming from carbonate rocks (CS) and those coming from silicate rocks (SS). Both of them are characterised by a very fine size distribution. CS is mainly made up of the same compounds of the processed stones (i.e. marble, limestone, travertine). On the contrary, SS is characterised by high heavy metal content, due to the composition of the tools employed during processing activities and to the original rock characteristics. Furthermore, total petroleum hydrocarbon content can often be recognised in residual sludge. In general, residual sludge, management of which in Italy is administered in accordance with ILD 152/06, can be used as waste for environmental restoration or for cement plants. Several researches investigate possible reuses of residual sludge, after a proper processing phase, as new products. Such “new products” should be certified not only on the basis of their technical and physical characteristics but also by means of appropriate chemical analyses to guarantee that the products are not polluted. The aim of this research was to evidence that, on the basis of a correct sludge characterisation, treatment and management, it is possible to produce secondary raw materials (filler, etc.) or new products (artificial soil, etc.), in order not to waste “sludge resources”. Some examples from Italian experimentations are here reported, focusing on the treatment and recovery of SS and CS.
N. Careddu; Giovanna Antonella Dino. Reuse of residual sludge from stone processing: differences and similarities between sludge coming from carbonate and silicate stones—Italian experiences. Environmental Earth Sciences 2016, 75, 1 .
AMA StyleN. Careddu, Giovanna Antonella Dino. Reuse of residual sludge from stone processing: differences and similarities between sludge coming from carbonate and silicate stones—Italian experiences. Environmental Earth Sciences. 2016; 75 (14):1.
Chicago/Turabian StyleN. Careddu; Giovanna Antonella Dino. 2016. "Reuse of residual sludge from stone processing: differences and similarities between sludge coming from carbonate and silicate stones—Italian experiences." Environmental Earth Sciences 75, no. 14: 1.
N. Careddu; O. Akkoyun. An investigation on the efficiency of water-jet technology for graffiti cleaning. Journal of Cultural Heritage 2016, 19, 426 -434.
AMA StyleN. Careddu, O. Akkoyun. An investigation on the efficiency of water-jet technology for graffiti cleaning. Journal of Cultural Heritage. 2016; 19 ():426-434.
Chicago/Turabian StyleN. Careddu; O. Akkoyun. 2016. "An investigation on the efficiency of water-jet technology for graffiti cleaning." Journal of Cultural Heritage 19, no. : 426-434.
This study aims to assess the use of a mix of anionic flocculant and water, in order to reduce the level of fine dust over the ground in a coal fly-ash landfill. So far, the reduction of dust has been achieved by means of water sprays: this method, however, resulted in high costs incurring in the rental of tank trucks; furthermore, the high consumption of water and diffusion of fuel gas both have a major environmental impact. The new method presented below shows how the creation of a thin film over the landfill can limit both wind erosion and dust emission caused by the transit of vehicles during operations. By collecting samplings of dust and laboratory tests, the authors were able to evaluate effectiveness of above mentioned method from a technical, economical and environmental point of view, which has been subsequently resulted in the Company opting for it
Nicola Careddu; Pierpaolo Medda; Claudia Sarritzu; Fabio Grasso. Particulate matter in fly-ash landfills: an abatement technology using anionic flocculant. Journal of Cleaner Production 2015, 102, 477 -484.
AMA StyleNicola Careddu, Pierpaolo Medda, Claudia Sarritzu, Fabio Grasso. Particulate matter in fly-ash landfills: an abatement technology using anionic flocculant. Journal of Cleaner Production. 2015; 102 ():477-484.
Chicago/Turabian StyleNicola Careddu; Pierpaolo Medda; Claudia Sarritzu; Fabio Grasso. 2015. "Particulate matter in fly-ash landfills: an abatement technology using anionic flocculant." Journal of Cleaner Production 102, no. : 477-484.
The disposal of microfine marble sawdust contained in marble slurry waste, currently represents an additional economic burden for dimension stones companies. This is because the sawdust is considered less important in comparison with the crushed calcareous aggregate produced in stone processing\ud plants. In addition, the sludge is mistakenly viewed as waste that has to be disposed of in landfill. State of the art in recovery and utilisation of calcareous sawdust is mainly aimed in uses as substitute for more expensive ingredient in the building sector. Moreover limestone dust, recovered from marble sawing and\ud processing slurry, has not yet found real economically feasible industrial usage. Due to the high market value of micronised CaCO3, we study the use of limestone sawdust as functional filler in industrial products having higher added value, such as paper, rubber, paints, pharmaceuticals. Standard requirements\ud of CaCO3 for this kind of products are very tight, especially those relating to purity level, particle size distribution and brightness. The high Calcium limestone deposit and the factories in Orosei Marble producing area (Sardinia, Italy) allow the production of high quality microfine dust. To evaluate the properties of the sawdust, several analysis were carried out to compare the results with the standard requirements of CaCO3 for paper, rubber and tyre production. The assessment concerns five different factories and it highlights the possible usage of the sawdust produced in Orosei by carrying out simple and inexpensive changes in both stone-working process and wastewater treatment. Finally, a commentary on environmental laws pertaining to the recycle of this kind of waste is also made in this paper
Nicola Careddu; Graziella Marras; Giampaolo Siotto. Recovery of sawdust resulting from marble processing plants for future uses in high value-added products. Journal of Cleaner Production 2014, 84, 533 -539.
AMA StyleNicola Careddu, Graziella Marras, Giampaolo Siotto. Recovery of sawdust resulting from marble processing plants for future uses in high value-added products. Journal of Cleaner Production. 2014; 84 ():533-539.
Chicago/Turabian StyleNicola Careddu; Graziella Marras; Giampaolo Siotto. 2014. "Recovery of sawdust resulting from marble processing plants for future uses in high value-added products." Journal of Cleaner Production 84, no. : 533-539.
The demand for Limestone/Calcium Carbonate (LCC) has substantially grown up for the last three decades due to the widespread use of CaCO3 in many industrial applications, not only in construction but also in other important sectors (e.g., environmental, food, pharmaceutical, paper, etc.). LCC is currently produced within the quarry and in laboratory (during crushing, milling, washing, etc.). In dimension stone industry, almost 30% of the block (squared or shapeless) is lost during sawing/cutting/processing. In the case of the Orosei Marble (East Sardinia, Italy), the sludge deriving from processing is mainly composed of Calcium carbonate and it has a great potential as secondary raw material or by-product as long as the chemical properties of the sludge meet the parameters required by current environmental laws. The research presented in this paper aims to explain how tools wear out and how consumables end up in the sludge.
Nicola Careddu; Graziella Marras. Marble Processing for Future Uses of CaCO 3 -Microfine Dust: A Study on Wearing out of Tools and Consumable Materials in Stoneworking Factories. Mineral Processing and Extractive Metallurgy Review 2014, 36, 183 -191.
AMA StyleNicola Careddu, Graziella Marras. Marble Processing for Future Uses of CaCO 3 -Microfine Dust: A Study on Wearing out of Tools and Consumable Materials in Stoneworking Factories. Mineral Processing and Extractive Metallurgy Review. 2014; 36 (3):183-191.
Chicago/Turabian StyleNicola Careddu; Graziella Marras. 2014. "Marble Processing for Future Uses of CaCO 3 -Microfine Dust: A Study on Wearing out of Tools and Consumable Materials in Stoneworking Factories." Mineral Processing and Extractive Metallurgy Review 36, no. 3: 183-191.