1,721,360 research outputs found
Digital multispectral techniques and automated image analysis procedures for industrial ore modelling
No full textThe choice of suitable beneficiation strategies is strictly linked to the precise mineral-petrographic, textural and structural characterisation of the ore. Careful analysis and precise modelling of spatial relationships between different mineralogical phases constituting the ore is the basis of any procedure which aims at forecasting the separation results. The textural and structural characterisation of the ore on a macro/microscopic scale is carried out through optical microscopy and in some special cases by SEM analysis. The main purpose of these procedures is that of obtaining information which can be used in numeric form as data for the models. The traditional procedure consists of analysing sections under the microscope to obtain distribution maps for the different mineral phases and making a synthesis of these data so that they can be easily managed inside a numeric procedure. In the last few years the development of procedures based on techniques of optical image processing has greatly reduced the analysis time, allowing a better characterisation of the ore in textural and structural terms. The growing development of research in electronics and computer science and the subsequent availability of hardware and software products, allow handling and processing of full colour digital images, at lower and lower costs. In this paper the problems arising from the adoption of such a digital approach both in terms of quality of results (mineralogical species automatic identification) and in terms of further processing of the data (morphological and morphometrical characteristics and assessment of the mineral species constituting the ore), are described and discussed. © 1995
The Use of Classical and New Digital Imaging-based Spectrophotometric Approaches in the Evaluation and Control of Ornamental Stone Finishing Surface Status
No full textOrnamental stone products are commercially classified on the market according to their aesthetical characteristics, that is on the base of their overall visible pictorial attributes. Such attributes results from the interactions of two different groups of factors: the first, intrinsically linked to the material characteristics (i.e, mineralogical composition, textural characteristics, presence of decays and/porosity, etc.); the second, strongly dependent on the production processes utilised to realise the final product. This latter aspect is
quite critical because, affecting stone's surface finishing, can contribute to enhance or not certain aesthetic features of the stone itself. When stones are manually worked, that is when a big added value is given to this natural product thanks to human expertise, it is very difficult to define standardized procedures able to perform an objective evaluation of their surface polishing. Such a difficulty also negatively influence the possibility to define “objective” procedures allowing to perform an aesthetic characterization of the hand
manufactured stone products in order to define pre-defined classes of surface finishing or to achieve, for a certain stone, a desired level of appearance. These aspects are of primary importance to certify, in pictorial terms, the aesthetic attributes of slabs, tiles and, in general, stone-based products. The study was addressed to evaluate the possibility to develop an innovative methodologies and techniques able to quantify the level of polishing of stone products, evaluating, at the same time, as polishing can
affect the effect the overall pictorial evaluation of a stone. To achieve this goal, two strategies have been
adopted: i) one based on a classic spectrophotometric approach and ii) the other based on an innovative
digital imaging-based spectrophotometric technique. In the first case, a specially-designed probe holder together with a computer-generated spectrum analysis technique was used. In the second case, imagingbased logic, according to intrinsic spectra handling, was applied. In both cases, measurements were performed on various rock samples to quantify their degree of polishing independent of stone surface
appearance characteristics, such as colour and texture. The results deriving from both the approaches have been compared and analyzed in order to establish, in respect of the potentialities of each investigated approach, the correlation existing between stone surface polishing status and their quantified aesthetic attributes
Membro del Scientific Committee of the International Conference Series on Solid Waste Technology and Management
No full textThe International Conference on Solid Waste Technology and Management covers landfill, recycling, waste-to-energy, waste reduction, waste policy, waste economics, composting, waste transfer, waste collection, municipal waste, industrial waste, residual waste and other MSW - municipal solid waste management and technology subjects
Membro di CHoPS International Scientific Council: CHoPS: International Conference for Conveying and Handling of Particulate Solids
No full textThe CHoPS Conference series represent an ideal occasion for the industrial manufacturers and researchers. The CHoPS Conference series are primarily addressed to evaluate and analyze the handling, production and segregation of the particulate solids. Furthermore, the conference investigates the latest food processing technologies. The attendees of the conference will also make elaborate discussion on the crushing, grinding and milling of mineral ores in the production plants. There will also be elaborate discussion on the metrics, controls and monitoring technologies for particulate materials. Furthermore, the conference thoroughly assesses the environment compliance measures in the metal, food and chemical production processes
Membro del Scientific Committee of the International Conference Series on Solid Waste Technology and Management
No full textThe International Conference on Solid Waste Technology and Management covers landfill, recycling, waste-to-energy, waste reduction, waste policy, waste economics, composting, waste transfer, waste collection, municipal waste, industrial waste, residual waste and other MSW - municipal solid waste management and technology subjects
Caratteristiche Morfologiche e fluidità di polveri ceramiche
No full textLe caratteristiche di fluidità di polveri ceramiche dipendono, oltre che dalle caratteristiche dimensionali (morfometria delle polveri), anche e soprattutto dalle loro caratteristiche di forma (morfologia delle polveri). La caratterizzazione morfologica è spesso condotta facendo ricorso a determinazioni di tipo classico, quale la stima del Diametro di Feret o del grado di arrotondamento (Roundness), parametri questi spesso insufficienti per operare una quantizzazione morfologica efficace delle polveri ceramiche al fine di stabilire correlazioni con le loro proprietà reologiche. Nel seguito vengono delineate due procedure, entrambe basate sul processamento di immagini digitali, in grado di operare una caratterizzazione morfologica di dettaglio di domini 2D internamente connessi. Attraverso tali procedure è possibile operare una caratterizzazione quantitativa della morfologia delle polveri ceramiche e quindi stabilire correlazioni tra tale attributi ed il loro comportamento a scorrimento
Member of the International Mineral Processing (IMPC) Council (http://impc-council.com/)
No full textIMPC, the International Mineral Processing Congress has been in existence now for more than fifty five years. The very first congress was held in September 1952 as a symposium on Mineral Dressing in London, organized by the then Institution of Mining and Metallurgy (IMM), which coincided with its 60th years’ celebrations. The symposium was held in the Imperial School of Science and Technology, London. With 39 technical papers and 332 delegates, it was indeed an impressive beginning to what is known today as IMPC. IMPC has been a major driving force for the promotion of scientific and technical knowledge in mineral processing and extractive metallurgy worldwide. It is the most prestigious event in the field of mineral processing in the world today. The congress has been truly international with delegates from all parts of the world deliberating on issues facing the industry over a period of five days. Prof. Cyril O’Connor took over as the Chairman of the IMPC council from Prof. Eric Forssberg in Istanbul. Prof. Forssberg very ably steered the IMPC council for twenty-one years before passing on the baton to Prof. O’Connor. Since the year 1995, IMPC has started honouring an eminent personality with a Lifetime Achievement Award during each Congress. The proud winners of the IMPC Lifetime Achievement Award include Prof. Douglas Fuerstenau (1995), Prof K. Schonert (1997), Prof Jean Cases (2000), Prof. Peter King (2003), Prof. H Schubert (2006) and Prof Janusz Laskowski (2008). In 2008 at the Beijing Congress the prestigious IMPC Council Award, for outstanding and noteworthy contributions to the activities of the Council and its various activities was awarded for the first time to Professor Nathaniel Arbiter. With new challenges facing the mining and mineral processing industry today, the importance of IMPC as an international forum where the latest advances in the field are shared amongst the participants both formally and informally is going to increase in the coming decades. The technical exhibition organized as a part of IMPC showcases the new process technologies, instruments and equipments and provides an occasion to make and/or renew professional contacts and build business relationships. IMPC has become an international event where the technical and business experts present their views on the challenges facing the industry and the new directions which need to be taken to face them. It is indeed a professionally rewarding experience to participate in IMPC for all the delegates. Mining, mineral and metal industries worldwide, in particular in China and India are witnessing unprecedented growth rates. The challenges facing the industry are also different from those in the past. Land and water scarcity are likely to be technological drivers in the near future. Environment compliance will be dictating the choice of technology options in the project under development. Exciting times are on the horizon for those who dare to dream and innovate. All this excitement and coming up with innovative solutions will be shared by the professional leaders with the delegates during forthcoming mineral processing congresses.
The history of the IMPCs has been well documented by our colleague Fathi Habashi. It may be interesting for those currently active in the world of mineral processing to be reminded this history which is available at http://works.bepress.com/fathi_habash
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