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The main aim of this paper is influence of composition samples partially made from recycled silicon carbide on integrity of .products. Since the products are used in the foundry industry, it is necessary to achieve high wholeness and strength of the samples in order to avoid their disintegration during handling. Further restrictions are the requirements of the foundry on the limits of quantity of individual raw materials. Purpose of this research is using silicon carbide waste material and therefore minimalizes of...

At present, there are tendencies in the world of depletion of ores and the involvement of low-grade and technogenic raw materials into processing. The ever-increasing scale of industrial production, with the involvement of valuable raw materials components in the processing of raw materials, led to an increase in the amount of man-made waste polluting the environment. Hundreds of millions of tons of flotation tailings accumulated in the tailings processing plants processing various ores, which contain significant ...

The management of solid waste is a challenge in municipalities of South Africa. The objectives of the study were to analyze the current status of recycling and challenges hindering efficient solid waste minimization mandate by municipalities in Limpopo province. The study employed both qualitative (through observation questionnaires interviews) and quantitative (fishers exact test) research methodology. The study was based on field surveys allowing for observation and measurement with respect to waste minimisation...

Superior capitalization of industrial waste as: slag heaps, plastics and rubber, vegetable and animal oils, natural or synthetic fibers, make significant contributions to reducing pollution, environmental protection, to increase eco-efficiency, reduce production costs per km of paved road. From the point of view of physical and mechanical properties most suitable materials that can replace mineral aggregates are blast furnace slag which after waste processing and sorting through the appropriate dimensions can succ...

Storage, protection and recycling of explosives, gunpowder and rocket fuel obtained from utilized ammunitions is significant problem. It requires, special services for safety and corresponding additional expenses on security and ecology. Same time, they are energetic materials and attractive for chemical and mining industry. One of the main directions for solving the above-mentioned problems is application of utilized ammunition for development of new industrial explosives for mining industry. Implementation of ne...

Studies to determine the forms of finding copper and iron in the converter slag of the Balkhash copper production were carried out. The microprobe analyzes of converter slag show that in these samples a significant amount of copper is in a sulphide form, lead in both sulphide and oxide, and in the form of glass, and zinc in oxide. Laboratory studies on the flotation of the original converter slag, as well as after remelting and its slow cooling, were carried out according to a scheme including the basic, control f...

BrewerпїЅs spent yeast is a byproduct containing high amounts of nitrogen, vitamins and immunogen compounds such as ?-glucans. Several uses of spent yeast were described, but the phytostimmulatory potential was not previously tested. In the present paper, the effects of spent brewery yeast on rye microgreen growth and composition and the potential use as an elicitor is assessed. Rye microgreens elicited with spent yeast presented improved germination, especially after 4 days of cultivation. Increased plantlet leng...

This paper presents the results of a multidisciplinary literature review of issues related to Circular Economy, waste management, recycling, eco-innovation, decision-supporting and environmental management that help to identify the key expectations, opportunities and problems related to decisions supporting waste management under the Circular Economy concept. The research findings enable identification of the areas of waste management based on the Circular Economy concept and the functions of the information syste...

The objective of this research is to study in laboratoryпїЅs materials such as: cationic bituminous emulsions, aggregates, fly ash, etc., in order to develop optimal and appropriate mix formula for "cold" waste asphalt recycling with the addition of slow breaking cationic bituminous emulsions, fly ash, cement and natural aggregates. The purpose of this approach is to obtain an "optimal combination" comprising the above-mentioned materials as well as the mixing of the wear layer on the surface of the road on which ...

Increasing the possibilities to utilize fly ashes from power stations is one of the major strategic directions involved in the implementation of the waste directive imposed by the European Parliament, enabling the protection of natural resources and a reduction of the amount of waste stored. Investigations into fly ashes from power stations indicate such waste contains rare earth elements (REEs) in much higher amounts than their average content in earthпїЅs crust. It has resulted in an increased interest in the ut...

A complex ecological analysis of the building sector includes different aspects. When building constructions are scrutinized from the point of view of nature protection, it is advisable to consider the entire life cycle of a building structure. Among the most essential elements of an assessment is the possible recyclability of materials recovered after the demolition of a building. Striving towards a global reduction of the volume of waste, we are forced to implement such construction and technological solutions t...

Active mining operations in range of gaining raw material have very negative impact on the natural environment. Long-term observations proved that mining exploitation causes very significant changes in natural environment, in the region in which it is conducted. Particularly, this is applies to underground exploitation of hard coal. Underground exploitation and associated coal production cause that a lot of post-mining wastes are formed. These wastes for several years of exploitation in Poland were deposited in po...

The paper presents experimental results obtained in determining the chemical composition of the base material- heat affected zone пїЅ filler material in reworking by ultrasonic welding field. The work shows the curve of the concentration of carbon, nickel, chromium, molybdenum, iron, tungsten, silicon and cobalt in the resulted material couple. There are presented differences between reworking in ultrasonic field and common welding process. The analysis of the results obtained and presented in the paper shows the ...

The paper presents a new method for reconditioning of automotive parts in an ultrasonic field by reworking. Experimental results were obtained in the case of using different material couples. Using three couples of different materials, three technological metallization processes were studied: - oxy-fuel flame and wire; - three-wire electric arc - oxy-fuel flame and powder In experimental work the following material couples were studied: X30NiMoVCr11-STELLITE 12 AWS, X30NiMoCr11-TP 4000, FxMo1Si24-STELLITE 12AWS. D...

End-of-life vehicles are one of the fastest growing waste streams in the world which should be managed correctly in accordance with Directive 2000/53 / EC on End-of-Life Vehicles, which aims to making dismantling and recycling of ELVs more environmentally friendly. Consequently, the treatment of end-of-life vehicles with the purpose of avoiding environmental pollution and to recover useful materials, especially metals is a major environmental concern. Hence recycling is essential method to solve this problem. It i...

The ENVIREE project is focused on the working-out of efficient and environmentally-friendly rare earth elements (REE) recovery technologies from selected industrial waste disposal sites. Compared secondary sources from metal production processes are characterized by the highest REE content among the European objects assessed under the project. The paper presents the environmental aspects of REE recovery from New Kankberg (Sweden) and Covas (Portugal) tailings. Based on the results from stage II of the study, i.e. ...

Rare earth elements (REE) are strategic resources, with an elevated risk of supply instability. Significant price fluctuations related to monopoly in REE mining and production increase interest in alternative sources of acquisition. Substantial growth in demand for REE in the next decade is projected. As a potential alternative sources of REE is considered recycling of electronic waste and the processing of ashes from the incineration of municipal waste. Also the reprocessing of mining waste, both from current pro...

Various sites with materials resulting from mining activities were investigated, as secondary sources for Rare Earth Elements (REE). The aim of our paper is to present the main methods used for characterizing these materials and the result of extraction processes in order to evaluate the efficiency of RRE recovery processes which are using environmentally friendly methods. The characterization of these materials is a first task aiming to identify the best sites which can furnish the most suitable materials for con...

Construction and demolition materials are generated when existing buildings are demolished. The concrete / masonry recycled aggregates can be used within trench reinstatement works. The aim of conducted experiment is to find a methodology for evaluating the effect of backfill compaction works via dynamic penetration tests (DPT). The first part of paper describes construction of testing pit located in research center AdMaS (Czech Republic). The paper continues then with the description of compaction and testing pro...

Currently the Life Cycle Assessment (LCA) methodology is more and more frequently used as a tool for evaluating the environmental performance of products or services. Conducting the LCA is particularly important and valuable for a new product, process or technology. That is also applied for research on the innovative solutions or process proposals. The ENVIREE project funded from the ERA-MIN programme within the 2nd Joint Call aims at complete recovery process proposal of REE (rare earths elements) from tailings a...

The manufacturing and processing of metals is connecting with large number of different types of wastes. One kind of these wastes are dusts and sludges which arise as a result of the melting processes or in the machining of castings. Flue dusts from melting processes are captured most often on filters, scrubbers or in Venturi scrubbers. Dust particles resulting from the machining of castings (grinding and blast cleaning) remain in the grinding rooms or they are sucked and collected on filters. Whereas these dusts ...

In the paper the precipitation of arsenic and iron from an acid drainage water of the Berikul mine wastes by using lime milk, NaOH, and Na2S were studied. The wastes were stored in the southern part of the Komsomolsk tailings impoundment, near the Komsomolsk settlement (Kemerovo region, Russia). The interaction of natural waters with the wastes produced ultra-acid drainage with a pH of about 2, with arsenic content of 1.3 g/l and iron - 6.5 g/l. The results of in situ experiments showed that adding lime milk and s...

Biological waste - so-called wet garbage - is one of the problems of efficient and clean waste collection. Due to their nature - they quickly decompose and cause unpleasant odor. Waste management of this biological garbage is possible in several different ways. They can be transported to landfill with other MSW. They can be segregated and collected separately and then processed in a collective way also in several ways. They can also be utilize in the place of origin. The paper presents energy analysis and environm...

Every day more than 60 tons of hydrolyzed lignin are produced only on one bioethanol manufacturing factory, 25000 tons per year. More than 1 million tons of lignin is produced by wood-recycling factories worldwide, which is being combusted to compensate energy costs or just stored as a waste. We suppose that there is a more sufficient way of its recycling and provide another way of lignin use, assuming the pyrolysis process as one of the pretreatment methods of its reproduction into more favorable derivatives. Pyr...

One of the most important sectors in the Romanian beverage industry is beer production. In 2015 this sector brought revenues of 533 million Euros to the state budget. The Romanian consume an average of 80 liters per capita so that Romania ranks 7th in the hierarchy of European beer-consuming countries according to the Brewers of Europe. The largest beer consumers from Europe in 2015 were the Czechs with 143 L per capita followed by Germans (106 L per capita) and Austrians (105 L per capita). In our case 97% of bee...

This study aims to valorise the mineral wastes in particular glass wastes, brick wastes and clay to produce granulated foam glass at different characteristics (G1: Granulate foam glass without additive; G2: Granulate foam glass with 10% clay and Granulate foam glass with 10% Brick wastes). The aggregates of foam glass were manufactured at a temperature 850 пїЅ C from glass wastes (cullet), brick wastes, clay and limestone as a foaming agent. Mixtures of Self-compacting mortar have been developed with elaborated fo...

The problems of regeneration and recycling of the calcareous component in the composition of chemical and metallurgical industry waste products are studied. The possibility of obtaining chemically precipitated calcium carbonate from gypsum wastes and slimes of alumina production is shown on the basis of a number of low-temperature processes that ensure binding of carbon dioxide as part of production emissions. The influence of quality of raw materials on the volume of belite sludge which is formed during the proce...

The circular economy concept is gaining increasing attention as a potential way to raise prosperity on the one hand and reduce the consumption of primary materials and energy and decrease waste generation on the other. One of the main principles of a circular economy is designing without waste пїЅ the target is to пїЅclose the loopпїЅ of the product life cycle. In particular, this concerns sectors such as the automotive industry, both because of its strategic economic importance and due to the potential and signif...

Construction, rehabilitation and maintenance of land communication use large quantities of material from processing plants (earth, natural aggregates including filler and binder). It is noted, however, that their diversity is limited. It is recommended to introduce and promote manufacturing technologies that have a low environmental impact. An artificial material used for road structure is the steel slag from steelworks. Ferrous metallurgical slag processing plant benefits in terms of environmental protection, in ...

Various metallurgical slags are generated in metal extraction, refining and alloying processes. Due to the large slag quantities and the strict erenvironmental regulations, recycling and utilization of these slags are an attractive alternative in order to reduce and eventually to eliminate the disposal cost, to minimize the related environmental pollution, and to save the resource conservation.The global warming effect and natural resource saving are the general environmental topics nowadays. In addition, the land...

This paper describes the current applied research of microwave pyrolysis (MP) treatment of sewage sludge at laboratory and full-scale conditions at University of Pavia (UNIPV) and Brno University of Technology, AdMaS research centre (BUT AdMaS). Disposal of sewage sludge is becoming one of the most important issues in waste water management in EU, particularly thermal treatment and reuse of sludge. Thermal treatment is often associated with incineration, but there are alternative methods such as gasification or py...

The development of modern technology affects all spheres of life. The use of such advanced technologies in urban management of individual processes and services is a concept of smart cities. The use of these innovative means leads to the efficient functioning of cities, reduce costs and often improve the quality of life of residents. Smart cities are a concept aimed at introducing information and communication technologies and tools for the effective management of sites and integrating citizens into his work. Smar...

The aim of the article was to present the possibilities of logistic solutions of management system of mixed waste and segregated waste that can be one coherent system or two parallel systems. The authors of the article attempted to optimize the transport of various waste fractions from their origins and collection to recycling and storage sites. The assumptions and limitations of adopted systems as well as conclusions are presented. Sustainable waste management should follow the hierarchy: waste prevention, reuse ...

This contribution describes developments in the area of plastic recycling aimed at the reuse of waste materials for the manufacture of a useful product. Throughout development of the concept пїЅmodular flood barrier structureпїЅ, the recovery of plastic materials was assessed, primarily, plastic waste from automobiles and industry. The investigators filed a utility model application, no. SK 5847 Y12, entitled пїЅModular flood barrier structureпїЅ. Terms of the type and composition of source material, polypropylene...

This paper is focused on the reuse of construction and demolition wastes in concrete production. From a large group of demolition wastes the concrete waste was selected. Tested concrete samples were prepared using coarse recycled concrete aggregate. In these specimens, fraction 4/8 mm were replaced by recycled concrete aggregate with a range of 100%. To reduce the absorption of the recycled concrete aggregate, the surface of aggregate was activated by a multi-stage mixing and using of geopolymer phases. To prepara...

The modern life and industrialization with their great impact and large scale of influence generates a colossal amount of waste products. Not only that they have huge physical volume but they also cause many short and long term effects on the nature, human way of life and all processes on the planet. The waste products' concentration in specific zones leads to conditions which makes them uninhabitable. The construction of landfills for industrial solid waste follows the modern requirements for disposing, encapsula...

ZvolenskпїЅ teplпїЅrenskпїЅ Inc. is a company that has been providing heating for the town of Zvolen for decades. After the reconstruction in 2008, it is using low-sulphur lignite, wood chips and natural gas as a fuel, resulting in fine ash, that is collected nearby; however, it is spread by natural forces into surrounding gardens, forests, soil and water. To dispose of this ash ecologically, there is a possibility of using the Oyster mushroom Pleurotus ostreatus (Jacq.) P. Kumm, namely its ability of absorbing th...

The purpose of this research was to study, analyze and evaluate strategies and concepts for recycling of waste related to the rests of burning processes form fossil fuels in the energy sector in transition countries. Accordingly to the European Opinion approach the objectives in future are to reduce the fossil energy resource utilization in order to minimize the negative impacts on the environment and human health. Meanwhile in countries that largely depend in energy production based on thermo power plants the mai...

Research Objective: To develop the rationale behind the implementation of low-waste technology in the light of development goals of mining company. The goals are determining the anticipated project results that are usually divided into economic, social and environmental results. Project methodology is different under the context of low-waste technology projects. Methodological Framework is based on the interdisciplinary methods, modern concepts of waste management and recycling under the context of mining operatio...

Research focuses on the use of alternative raw materials and on finding new solutions to reduce noise in the context of issues related to environment, is of great interest and great actuality. Composite materials with fir sawdust, used rubber granules and textile waste; Aracet (polyvinyl acetate) and hydrated lime as a binding material, were used in this research. Materials acoustic absorption coefficient was found using the impedance tube method. The values obtained show that these materials can be used for absor...

The paper presents the research on the use of a waste material (a recycled powder) which partially replaces cement in fine-grained concretes. The powder was obtained in the thermo-mechanical treatment of concrete rubble, which this article describes. Roasting made a cement paste partially dehydrated and consequently activated the cementпїЅs binding capacity. The recycled powder was tested in terms of a sieve analysis, the Blaine surface area method, density and a thermal analysis. Then the statistical experiment c...

The foundry sand wastes (FSW) are likely to constitute as raw material for the manufacture of cement mortars or concretes at a low cost. For this reason, present work has main objective to use the foundry sand wastes in self-compacting mortar as a fine aggregate (by a partial sand substitution). An experimental tests were carried out to evaluate fresh (slump test) and hardened (bulk density, compressive and flexural strength and elastic modulus) properties of SCMs based on FSW. The Natural Sand (NS) is substituted...

Scientific researches performed as part of grant funding of the project focused on solving a global problem related to saving resources and the environmental protection resulted in the development of an innovation technology of gravity and flotation beneficiation for gold-bearing man-induced sediments of near-surface strata together with allied veined masses within crude ores mined selectively at the West Kalbinsk metallogenic zone in Kazakhstan. Stage separation of a mixture consisting of arsenic carbonaceous man...

Due to the increased demand and supply shortage, neodymium is listed as critical raw material of the strategic importance in many countries in the world. From this point of view the researches for the development of recycling technologies for this metal are strongly justified. The paper presents the results of laboratory research on the hydrometallurgical recycling of neodymium from hard disk drivers (HDDs). Neodymium magnets are the elements of a positioner which drives the head of the HDD. The study material- si...

Processing the waste paper produces huge amounts of waste - papermaking sludge. This kind of waste includes around 50 % of inorganic material and high proportion of water. Its current economic recovery is very limited, which affects the overall efficiency of recycling paper. However, the elementary and chemical composition has a high potential for wider and more economically efficient use in various industrial fields. The object of this paper is research of composition and physical properties of such sludge from o...

Many entities from energy sector are investing in the rational use of waste generated in the energy production process, using them as valuable raw materials. Measurable economic and environmental benefits associated with the recovery of waste lead to the development of new directions for their reuse. The proper organization of the logistic chain allows for the efficient management of energy waste from the manufacturer's point of view. Innovative technical and process solutions from the energy industry are conduciv...

Rare Earth Elements (REE) are crucial for modern technologies and renewable energy application, while there is a high risk of supply. REEs have been identified as critical raw materials for the development and the European Union economy competitiveness. Currently, China dominates the market of REEs production and refining. However, there are several REE containing materials not being properly addressed. The ENVIREE project, funded by the ERA-MIN programme, is focused on REE supply for Europe, by addressing the exp...

In this study, the geomechanical properties of the heterogeneous limestone rocks in ??rnak coal mine roof cemented at cracks and the effect of the qualities of cementing paste fill on strengthening by the different silica fume paste were investigated. For this purpose, uniaxial compressive strength, point load strength, impact resistance, friction with Abrasion Loss, Impact Abrasion Loss (Los Angeles Assay) tests were managed following the cemented 50x50x50mm blocks. Even the physical properties; density, water ab...

The goal of this article is answering the question about what role can be played - as well as what role is actually being played - by thermal waste processing plants in Poland. The beginning of the XXI century is a time of new pro-environmental ideas. This is associated with an increase in the awareness of societies regarding the necessity of protecting the planet that we live on, as well as with the depletion of the natural resources that are at our disposal. In the face of such intense environmental changes, it ...

The paper analyzes physicochemical properties of liquid products of waste tyre pyrolysis, and attempts to assess their usefulness as fuel for diesel engines. Every year, the number of produced vehicle tires increases at a very fast pace. Used tyres turn into waste that is difficult to manage simply because, according to relevant EU regulations, vehicle tires should be subject to recycling. To a large extent, the problem of waste tyres management may be resolved by their utilization through pyrolysis. The processin...