scholarly journals New EAF Slag Characterization Methodology for Strategic Metal Recovery

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1513
Author(s):  
Nour-Eddine Menad ◽  
Nassima Kana ◽  
Alain Seron ◽  
Ndue Kanari
Keyword(s):  
New Technologies ◽  
Slag Sample ◽  
Steel Slag ◽  
Analytical Techniques ◽  
Added Value ◽  
Metal Extraction ◽  
Magnetic Fraction ◽  
Magnetic Components ◽  
Physico Chemical ◽  
Hematite Fe2o3

The grown demand of current and future development of new technologies for high added value and strategic metals, such as molybdenum, vanadium, and chromium, and facing to the depletion of basic primary resources of these metals, the metal extraction and recovery from industrial by-products and wastes is a promising choice. Slag from the steelmaking sector contains a significant amount of metals; therefore, it must be considered to be an abundant secondary resource for several strategic materials, especially chromium. In this work, the generated slag from electric arc furnace (EAF) provided by the French steel industry was characterized by using multitude analytical techniques in order to determine the physico-chemical characteristics of the targeted slag. The revealed main crystallized phases are larnite (Ca2SiO4), magnetite (Fe3O4), srebrodolskite (Ca2Fe2O5), wüstite (FeO), maghemite (Fe2.6O3), hematite (Fe2O3), chromite [(Fe,Mg)Cr2O4], and quartz (SiO2). The collected slag sample contains about 34.1% iron (48.5% Fe2O3) and 3.5% chromium, whilst the vanadium contents is around 1500 ppm. The Mössbauer spectroscopy suggested that the non-magnetic fraction represents 42 wt% of the slag, while the remainder (58 wt%) is composed of magnetic components. The thermal treatment of steel slag up to 900 °C indicated that this solid is almost stable and few contained phases change their structures.

scholarly journals Technologies and Extraction Methods of Polyphenolic Compounds Derived from Pomegranate (Punica granatum) Peels. A Mini Review

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 236
Author(s):  
Dimitrios Lampakis ◽  
Prodromos Skenderidis ◽  
Stefanos Leontopoulos
Keyword(s):  
Electric Fields ◽  
Bioactive Compounds ◽  
New Technologies ◽  
Ohmic Heating ◽  
Punica Granatum ◽  
Extraction Methods ◽  
Added Value ◽  
Green Solvents ◽  
Ultrasound Assisted Extraction ◽  
Functional Product

The interest in using plant by-product extracts as functional ingredients is continuously rising due to environmental and financial prospects. The development of new technologies has led to the achievement of aqueous extracts with high bioactivity that is preferable due to organic solvents nonuse. Recently, widely applied and emerging technologies, such as Simple Stirring, Pressure-Applied Extraction, Enzymatic Extraction, Ultrasound-Assisted Extraction, Pulsed Electric Fields, High Hydrostatic Pressure, Ohmic Heating, Microwave Assistant Extraction and the use of “green” solvents such as the deep eutectic solvents, have been investigated in order to contribute to the minimization of disadvantages on the extraction of bioactive compounds. This review is focused on bioactive compounds derived from pomegranate (Punica granatum) peels and highlighted the most attractive extraction methods. It is believed that these findings could be a useful tool for the pomegranate juices industry to apply an effective and economically viable extraction process, transforming a by-product to a high added value functional product.

scholarly journals Natural Drying of Astringent and Non-Astringent Persimmon “Rojo Brillante”. Drying Kinetics and Physico-Chemical Properties

Foods ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 647
Author(s):  
Cristina M. González ◽  
Rebeca Gil ◽  
Gemma Moraga ◽  
Alejandra Salvador
Keyword(s):  
Chemical Properties ◽  
Drying Kinetics ◽  
Added Value ◽  
Diospyros Kaki ◽  
Drying Characteristics ◽  
Water Diffusivity ◽  
Physico Chemical ◽  
Drying Treatment ◽  
Effective Water ◽  
Natural Drying

Persimmon (Diospyros kaki L.f.) crop has markedly increased in Spain, and “Rojo Brillante” persimmon is the main cultivated variety. This astringent cultivar requires de-astringency treatment before commercialization, which may involve an extra cost. Its short commercial season implies handling large volumes of fruits with consequent postharvest losses. Therefore, the development of derived added-value products is of much interest. In this study, astringent and non-astringent “Rojo Brillante” persimmons were dehydrated by following a natural drying method used in Asia. The drying kinetics and physico-chemical properties were analyzed for 81 days. The results indicated subsequent reductions in weight, water content, and water activity throughout the drying process, and the equatorial diameter decreased. All the employed thin-layer mathematical models were suitable for representing the drying characteristics of both products with similar behavior. The effective water diffusivity values were 5.07 × 10−11 m2 s−1 and 6.07 × 10−11 m2 s−1 for astringent and non-astringent persimmon samples, respectively. The drying treatment significantly decreased the soluble tannins content, and the astringent samples obtained similar values to those obtained for the non-astringent samples in 20 days. The external and internal flesh of the astringent fruit remained orange through the drying period, while brown coloration in the non-astringent fruit was observed after 57 drying days. Therefore, prior de-astringency treatment would not be necessary.

scholarly journals Valorisation of Coffee Roasting By-Products: Recovery of Silverskin Fat By Supercritical CO2 Extraction

2021 ◽  
Author(s):  
Rita Nasti ◽  
Andrea Galeazzi ◽  
Stefania Marzorati ◽  
Federica Zaccheria ◽  
Nicoletta Ravasio ◽  
...  
Keyword(s):  
Scale Up ◽  
Added Value ◽  
Supercritical Co2 Extraction ◽  
Green Technologies ◽  
Coffee Silverskin ◽  
New Concepts ◽  
Physico Chemical ◽  
High Investment ◽  
Fat Yield ◽  
By Products

AbstractRecovery of agro and food-industrial waste and their valorisation via green technologies can help to outline new concepts of industrial strategies. In this contest, a fat enriched of added-value components was extracted from coffee silverskin by applying a supercritical fluid extraction technique (sc-CO2). An appropriate modulation of process parameters like temperature (T = 35, 50, 60 °C) and pressure (p = 200–300 bar) influences the fat yield and the chemical composition, opening the way for targeted extraction. The extraction time, the organic solvent use and the energy consume were reduced compared to Soxhlet. Moreover, a mathematical model was constructed based on the experimental data collected, employed apparatus, and physico-chemical characteristics of biomass, pointing to a possible industrial scale-up. The experimental results are accompanied by a preliminary cost of manufacturing (COM), highlighting how the high investment for the apparatus is compensated by several benefits. Graphic Abstract

Kean Miltos: The Well-Known Iron Oxides of Antiquity

1997 ◽  
Vol 92 ◽  
pp. 359-371 ◽  
Author(s):  
E. Photos-Jones ◽  
A. Cottier ◽  
A. J. Hall ◽  
L. G. Mendoni
Keyword(s):  
Iron Oxides ◽  
Analytical Techniques ◽  
Field Work ◽  
Archaeological Record ◽  
The North ◽  
Naturally Occurring ◽  
Physico Chemical ◽  
Wide Range ◽  
Industrial Mineral

The island of Kea in the North Cyclades was well known in antiquity for its miltos, a naturally occurring red iron oxide valued for its colour and wide range of applications. By combining geological field work, physico-chemical analytical techniques, simulation (heating) experiments as well as simple laboratory tests, this paper describes the study of Kean iron oxides in an attempt to characterize this material which is still largely elusive in the archaeological record. The present work corroborates previous observations about the superior quality of some Kean iron oxides. Furthermore, it puts forward the hypothesis that miltos may have been considered an industrial mineral, and as such may have been used as an umbrella term for a variety of materials including mineralogically distinct purple as well as red iron oxides.

scholarly journals Serious Games: herramientas para el aprendizaje / An Experience of Serious Game as a Learning Tool

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Noemí Pena Miguel ◽  
Máximo Sedano-Hoyuelos
Keyword(s):  
High School ◽  
High School Students ◽  
Vocational Training ◽  
Serious Games ◽  
Teaching And Learning ◽  
New Technologies ◽  
Educational Games ◽  
Serious Game ◽  
Added Value ◽  
School Students

ABSTRACTThe introduction of new technologies in society has created a need for interactive contents that can make the most of the potential that technological advances offer. Serious games as educational games are such content: they can be defined as video games or interactive applications whose main purpose is to provide not only entertainment but also training and enhancing skills in areas such as health, marketing, education, etc. The game was associated with childhood and youth but serious games search for promoting, strengthening and giving added value to the teaching and learning process for all ages. One of the most crucial factors for successful educational games is their ability to maintain an individual learner’s motivation and interest by adapting the individual learning and gaming experience to each learner’s needs, preferences, goals, and abilities. For this reason, Serious Games need tutoring and dynamization. The aim of this paper is to analyze a specific experience success in the use of Serious Games for training. It details how this serious game can enhance different skills in each of the phases of the game. This Serious Game was used to promote innovation among High School students and students at Vocational Training Centres. The users must manage a supermarket trying to get the best results possible by taking a series of both strategic and operational decisions. Through an econometric regression model, we have analyzed the results of its use by a group of High School students and Vocational Training School students.RESUMENLos Serious Games son juegos cuyo fin va más allá del mero entretenimiento y persiguen transmitir contenidos, valores, potenciar habilidades y competencias e incluso servir como herramienta de marketing al utilizarse como medio publi-citario. En los últimos años, las TIC han ido tomando protagonismo en el ámbito educativo y formativo y los Serious Games están jugando un papel fundamental como herramientas formativas. El juego anteriormente se asociaba a las etapas de la infancia y la juventud pero los Serious Games pretenden potenciar, reforzar y dar un valor añadido importante al proceso de enseñanza y al proceso de aprendizaje para todas las edades. No obstante, para que los Serious Games alcancen todo su potencial como herramienta en el proceso de aprendizaje, es necesario complementarlos con una buena tutorización y dinami-zación que guíe dicho aprendizaje. Sin duda, sin la labor tutorial, los Serious Games pierden eficacia en su objetivo de poten-ciar el aprendizaje. El objeto de estudio del presente trabajo es analizar una experiencia de éxito concreta en el uso de los Serious Games para el ámbito formativo. En él se detalla cómo a través de un juego que se ha utilizado entre los alumnos de Bachillerato y Formación Profesional se pueden potenciar diferentes competencias en cada una de las fases del mismo. En él, el usuario debe gestionar un supermercado tratando de obtener los mejores resultados posibles tomando una serie de decisio-nes tanto estratégicas como operativas. A través de un modelo econométrico de regresión de elaboración propia analizaremos los resultados obtenidos en su utilización por un grupo de estudiantes de Formación Profesional y Bachillerato. Contacto principal: [email protected]

scholarly journals The structural characteristics of world trade and the merchandise exports of Serbia

2009 ◽  
Vol 54 (181) ◽  
pp. 55-91
Author(s):  
Radovan Kovacevic
Keyword(s):  
Developing Countries ◽  
World Trade ◽  
New Technologies ◽  
Structural Characteristics ◽  
Developed Countries ◽  
Added Value ◽  
Production Networks ◽  
International Production ◽  
Starting Point ◽  
Merchandise Trade

This paper analyses the world merchandise trade structure and the structure of Serbian merchandise exports. The analysis shows that the prominent characteristic of post-World War II world trade is more dynamic growth in the volume of manufactured goods as compared to agricultural goods. Due to the lessening share of agricultural products world merchandise trade has decreased and rapid industrialization has been fostered in developing countries. An increased share for developing countries followed the developed countries' decreasing share in world manufacturing trade. The developing countries' increased share was strongest in telecom and office equipment exports. These sectors are characterized by production fragmentation, which is being realized by transnational companies. Serbia, like the other South East European countries, has not yet managed to significantly integrate into international production networks. Serbia's most important exports are manufactured products with a low level of added value . In addition, Serbia still has a high share of primary products in its exports. A higher share of exports of goods and services in the gross domestic products (GDP) cannot be achieved without increasing imports of new technologies and equipment, i.e. without a higher investment share of the GDP. The main conclusion of this article is that the creation of a favorable investment climate and an increase in Serbia's international credit rating are the preconditions for stronger foreign direct investment (FDI), which would be the main channel for restructuring in the real sector. Creation of new small and medium enterprises (SMEs) through greenfield investment and their integration into the international production networks is the starting point for the restructuring of Serbian industrial production and merchandise export, i.e. the way of increasing the share of merchandise exports in the GDP.

scholarly journals Development of technology and formulation of cracker of high nutritional value

2021 ◽  
Vol 32 ◽  
pp. 03013
Author(s):  
Anna Kovaleva ◽  
Svetlana Galchenko ◽  
Alex Kolchanov
Keyword(s):  
Nutritional Value ◽  
New Technologies ◽  
Healthy Lifestyle ◽  
Chemical Properties ◽  
Product Categories ◽  
Balanced Diet ◽  
Healthy Nutrition ◽  
Physico Chemical ◽  
Snack Products ◽  
Buckwheat Flour

Human nutrition is one of the important factors that determine the health of the population. A fullfledged balanced diet creates conditions for normal physical and mental development, affects the body’s ability to resist the effects of adverse environmental factors. The modern progressive direction of development of the confectionery industry is the creation of new technologies and the development of products of increased nutritional value. Today, a large number of product categories are represented in the structure of the snack market. One of the trends of recent years in the snack market is an increase in the consumption of natural snack products (nuts, seeds, dried fruits). In large part, this is due to the desire of consumers to live a healthy lifestyle. Therefore, products that carry the idea of proper and healthy nutrition are increasingly appearing on the market. This is what the developed product is a cracker with enhanced nutritional value. In the course of the study, the technology and recipe of the cracker of said increased nutritional value were developed. This result was achieved by adding buckwheat flour and cheese to the recipe. The additives used allowed crackers to be made with high organoleptic and physico-chemical properties. At the same time, the optimal recipe was determined, in which wheat flower was replaced with 40% buckwheat flour. The analysis of the chemical composition and nutritional value of the developed cracker samples of increased nutritional value proved the validity of the additives introduced. Due to the introduction of these ingredients, the contents of B vitamins (B1, B2, B4, B6), dietary fiber, as well as other nutrients like magnesium, potassium, calcium, zinc, copper, molybdenum, sodium and chlorine, increased.

Characterisation of the Filter Elements of End-of-Life Biological and Chemical Protection Masks Used by the Army

2008 ◽  
Vol 587-588 ◽  
pp. 778-782
Author(s):  
Marta Cabral ◽  
João C. Bordado ◽  
António Correia Diogo ◽  
Fernanda Margarido
Keyword(s):  
End Of Life ◽  
Nitrogen Adsorption ◽  
Added Value ◽  
Carbon Cloth ◽  
Activated Carbon Cloth ◽  
Chemical Protection ◽  
Physico Chemical ◽  
Nitrogen Adsorption Isotherms ◽  
Dissolved Components

The main purpose of the present study is to assess the usefulness of filter cartridges from end-of-life biological and chemical protection masks, for other applications (with increased added value) instead of landfill deposition. Filters with different ages up to fifty years, were dismantled and divided in their components. Physico-chemical characterisation of each filter cartridge component was performed using different techniques such as: optical microscopy, Fourier transform infrared spectroscopy, pyrolysis, particle size distribution by laser diffraction, surface area determination from the nitrogen adsorption isotherms at 77K, determination of open porosity by helium pycnometry, and dynamic mechanical thermal analysis in the temperature range from -100°C to 200°C. It is shown that the loss of resilience of the rubber sealant is the main factor that controls the shelf life of filter cartridges. On the other hand, most of the charcoal in the activated carbon cloth remains active and can be useful for other less severe applications such as the removal of dissolved components from freshwater and/or marine systems.

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