scholarly journals HUMAN INTERFERENCES TO THE ENVIRONMENT, CONSEQUENCES AND CARE

2017 ◽  
Vol 43 (5) ◽  
pp. 2465
Author(s):  
P. Lampropoulou ◽  
Th. Tzevelekou ◽  
D. Papamantellos ◽  
V Stivanakis ◽  
S. Papaefthymiou
Keyword(s):  
Raw Materials ◽  
Sewage Treatment ◽  
Modern Science ◽  
Mineral Resources ◽  
Industrial Wastes ◽  
Negative Consequences ◽  
Municipal Solid Wastes ◽  
Copper Zinc ◽  
Scrap Metals ◽  
High Level

The need to restore the relationship of mankind with the environment led to the designation of measures, terms and processes worldwide for the prevention or reduction to the highest possible degree of the negative consequences to the environment ensuring a high level of protection of human health and the environment. It is general ascertainment that there is a big lack of objective information in Greece regarding the possibilities of modern science and technology for the treatment of Solid Industrial Wastes (SIW), Municipal Solid Wastes (MSW) and biological Sewage Treatment Plants (STP) products safely for the public health and the environment. In Greece the most significant sources of SIW are the big exploitations of “Mineral Ores”.On the contrary, the cement industries provide an important way out for the consumption of SIW like fly ash, red mud, et. A big percentage of the total amount of produced alloys of iron, copper, zinc and aluminium do not use “Mineral Resources” as raw materials but recycle scrap metals. At the end, the successful results of pyrometallurgical production of final products by SIW as well as the results of the production of new friendly to the environment and high technology refractory materials are given in this work.

scholarly journals INNOVATIVE PROCESSES OF DEEP AND ENVIRONMENTALLY SAFE PROCESSING OF TECHNOGENIC RAW MATERIALS IN THE CONDITIONS OF NEW ECONOMIC CHALLENGES

2021 ◽  
Vol 13 (2) ◽  
pp. 224-237
Author(s):  
Valentin CHANTURIA ◽  
◽  
Irina SHADRUNOVA ◽  
Olga GORLOVA ◽  
◽  
...  
Keyword(s):  
Raw Materials ◽  
Mining Industry ◽  
Mineral Resources ◽  
Secondary Products ◽  
Resource Saving ◽  
Mineral Raw Materials ◽  
The Face ◽  
Environmentally Safe ◽  
Copper Zinc ◽  
Technogenic Raw Materials

Innovative processes of deep and complex processing of technogenic raw materials in the context of sustainable development of the mining industry and the economic challenges facing the mining industry should ensure the transition to a circular economy and the maximum use of natural resources. The article reflects the priority scientific and technological research on the involvement of technogenic mineral resources in efficient processing. Presented, developed at ICEMR RAS, including jointly with universities, research and production organizations and enterprises, modern innovative processes of deep and environmentally friendly processing of refractory mineral raw materials of complex material composition (tailings of enrichment of non-ferrous and noble metal ores, poor off-balance ores, slags ferrous and nonferrous metallurgy, sludge of metallurgical production) and hydro-mineral technogenic resources (acidic mineralized bottom-dump waters of mining enterprises of the copper-zinc complex of the Urals, saponite-containing circulating waters of diamond processing factories). Among other things, new directions in the field of selective disintegration of finely dispersed mineral raw materials based on energy effects and deep processing of slags are outlined; increasing the selectivity of enrichment processes; combined processing of technogenic raw materials; resource-saving processing of technogenic and hydro-mineral resources, obtaining secondary products from processing waste. It is shown that in the face of new economic challenges, Russia has sufficient scientific and technological potential in the field of deep and environmentally safe processing of technogenic raw materials in the form of developed and, to varying degrees, tested innovative resource-saving technologies that correspond to the world level, and in a number of technologies are superior to it.

scholarly journals A Comparative Study of Copper, Zinc and Aluminium as Electrodes in the Preparation of Starch-based Polyelectrolyte

2019 ◽  
pp. 1-5
Author(s):  
J. O. Jeje ◽  
K. T. Oladepo
Keyword(s):  
Power Supply ◽  
Raw Materials ◽  
Distilled Water ◽  
Raw Water ◽  
Calcium Hypochlorite ◽  
Turbidity Removal ◽  
Water Treatment Process ◽  
Copper Zinc ◽  
High Level ◽  
Better Than

Alum (Al2 (SO4)3. 18H2O) has been the coagulant mostly used in the water treatment process. Alum imported into the country gets stuck at the port because of the congestion of the port. When alum is used to coagulate water, it depresses the pH of the water, thus, requiring a pH booster. Because of the high dependence on alum, alternative coagulants produced with local raw materials will be of great advantage. A starch-based polyelectrolyte was prepared by dispersing 3 g of cassava starch and 10 g of heaping teaspoon of high-test granular calcium hypochlorite (commercially available as HTH) in 100 ml distilled water; making it up to a litre solution with hot distilled water (temperature 80ºC – 100ºC) and electrolysing by means of stabilized power supply using aluminium rods as electrodes to produce polyelectrolyte A. Copper rods and zinc rods were similarly used to polyelectrolyte B and polyelectrolyte C respectively. To test the effect(s) and interaction of the charging variables, i.e. separating distance, power supply and time of charging, a three-factor experiment (23 factorial designs) was carried out. The variables were operated at High Level (+) and Low Level (-). The analysis indicates that the power of charging has the most significant effect on the coagulation characteristics of the starch-based polyelectrolyte. Polyelectrolytes A and C were tested with raw water drawn from Opa dam and were found to be effective water coagulants. Polyelectrolyte B on the other hand, adds to the turbidity of the raw water with which it was tested. Polyelectrolyte A was found to be as effective as Alum at natural water condition (pH 7) causing better than 88% turbidity removal with the dosage of 65 mg/l.

Investigating of Nitric Acid Leaching of High-Sulfur Copper Concentrate

2020 ◽  
Vol 299 ◽  
pp. 968-973
Author(s):  
Denis A. Rogozhnikov ◽  
Andrey A. Shoppert ◽  
L.M. Karimova
Keyword(s):  
Nitric Acid ◽  
Noble Metals ◽  
Raw Materials ◽  
Acid Leaching ◽  
Mineral Resources ◽  
Low Grade ◽  
Mathematical Methods ◽  
Nitric Acid Leaching ◽  
Copper Zinc ◽  
Thermodynamic Probability

This article describes the problems of deterioration of the quality of processed raw materials due to depletion of mineral resources. It is proposed to use nitric acid for the processing of complex refractory low-grade concentrates containing non-ferrous and noble metals. It was found that the studied concentrate contains: sphalerite (26.9 %), pyrite (22.0 %), chalcopyrite (19.9 %), silica (13.9 %), alumina (5.5 %), galena (1.7 %), oxidized forms of iron (Fe2O3) (12 %). Gold and silver are associated with sulfide minerals. Typical reactions of interaction of these minerals with nitric acid are considered. A sufficiently high thermodynamic probability of these reactions in a wide temperature range is established. With the use of mathematical methods, the optimal conditions of the process of nitric acid leaching are selected: the ratio of L:S = 5:1; the concentration of nitric acid 10 mol/L; the duration of the process is 60 minutes. In this case, the extraction of copper, zinc, iron and sulfur into the solution was 99.00 %, 99.84 % 98.60 %, 88.51 %, respectively.

Assessment of Technogenic System Impact on the Environment and Technospheric Safety for Mineral Development in Amurskaya Oblast

2014 ◽  
Vol 1051 ◽  
pp. 557-561
Author(s):  
Dmitry Golubev ◽  
Liudmila Krupskaya ◽  
Valentina Zvereva ◽  
Marina Filatova
Keyword(s):  
Air Pollution ◽  
Sulphur Dioxide ◽  
Mineral Resources ◽  
Mineral Processing ◽  
Total Risk ◽  
Mineral Development ◽  
Processing Wastes ◽  
Copper Zinc ◽  
High Level ◽  
The Impact

The article presents the results of the study to assess the impact of the tehnogenic system on the environment and technospheric protection during mineral resources development in the Amurskaya oblast (region). High ecological toxicity of tailings, contributing to the deterioration of the life environment. According to the authors’ research, here air pollution can be attributed to high level. At all pilot sites MPC level exceeding in soils and vegetation for arsenic, chromium, manganese, copper, zinc, lead, cobalt, antimony was determined. Analyzing total risk indexes for substances effecting the same systems and organs, the highest value was found for the group of substances affecting the human respiratory organs: suspended particles, sulphur dioxide. The measures reducing the impact of mineral processing wastes on the environment and the health of the mining settlements population in Khabarovsky Krai were developed.

TRENDS IN MINERAL COMPLEX DEVELOPMENT AT THE TURN OF THE CENTUARY

2018 ◽  
pp. 3-15
Author(s):  
A. L. Dergachev ◽  
V. I. Starostin
Keyword(s):  
World Economy ◽  
Raw Materials ◽  
Supply And Demand ◽  
Mineral Resources ◽  
Strategy Of Development ◽  
Mineral Complex ◽  
Complex Development ◽  
Mineral Commodities ◽  
Working Out ◽  
Mineral Base

Important trends in development of world's mineral complex at the beginning of the 21st century are increase of supply and demand for mineral materials differentiated for various metals and nonmetallic mineral resources, regions and countries; concentration of production of mineral commodities in small number of countries; falling availability of economic reserves of raw materials for world economy even at current level of material extraction. The tendencies should be taken into account when working out strategy of development of Russian mineral base.

Change of quality indexes of premixes in the storage process

2020 ◽  
pp. 105-112
Author(s):  
Oksana Bitlian ◽  
Oksana Kravchenko ◽  
Tetiana Kodak ◽  
Andrii Onyshchenko ◽  
Tetiana Konks
Keyword(s):  
Raw Materials ◽  
Storage Process ◽  
Important Place ◽  
Inappropriate Use ◽  
Chemical Structures ◽  
Copper Zinc ◽  
Qualitative Responses ◽  
Chelating Compounds ◽  
Quality Indexes

The analysis of literature sources shows that the type and material from which the packaging is made has an important place in the system of factors which influence on the storage of feed products and also prevents reducing the quality of raw materials and finished products. Therefore, the purpose of our research is the technological justification of changing the quality indexes of premix samples with salts of trace elements of different chemical nature in the process of storage. For the solution of the tasks, common zootechnical and statistical methods of the research were used. The use of premixes in feeding pigs is based on the fact that they should be used taking into account the biogeochemical properties of the region for which they are calculated. Foods depending on regional properties have a special biochemical composition and excess or lack of individual substances should be offset by the composition of premix. Ignoring this provision necessarily leads to the inappropriate use of BAR, the misbalance of the diet in relation to the physiological needs and inefficiency of the industry. In turn, it requires the purchase and conservation of products for the period of use. Various chemical structures and structures of BAR during the storage process react differently and change qualitative indexes, which leads to a decrease in the productive activity of active substances. It was determined that the humidity of premixes varied within the limits of 12.0-13.0 %, which exceeded the normative, but was not critical, the highest acidity had premix with sulfuric acid salts (6.9 units), the least - premix with lysates (5.7 unit). According to the results of the study, positive qualitative responses were found for the presence of vitamins A, D and B2, macro- and micronutrients: potassium, magnesium, copper, zinc, cobalt, iodine. The above facts of changes in the properties of premixes in the process of storage must be taken into account when providing technological bases for feeding pigs in order to obtain high gains and the quality of manufactured products. Key words: premix, micro-and macro elements, combined fodders, fodder mixes, chelating compounds, feeding, using, pigs' livestock.

Conditioning of oily sludges with municipal solid wastes incinerator fly ash

1997 ◽  
Vol 35 (8) ◽  
pp. 231-238 ◽  
Author(s):  
Tay Joo Hwa ◽  
S. Jeyaseelan
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Specific Resistance ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Solid Wastes ◽  
Municipal Solid Wastes ◽  
Capillary Suction ◽  
Optimum Dosage

Conditioning of sludges improves dewatering characteristics and reduces the quantity of sludge to be handled. Anaerobic digested sludge collected from a sewage treatment plant contained 1.8% to 8% oil. The increase of specific resistance and capillary suction time (CST) with increasing oil content observed in these samples indicates the interference of oil in dewatering. It has been found that addition of municipal solid wastes incinerator fly ash decreases the specific resistances and capillary suction times of oily sludges rapidly up to 3% dosage. Beyond 3% fly ash, the decrease is less significant and the solids content in the sludge cake increases. This optimum dosage remains the same for sludges with varying oil contents from 1.8% to 12%. The total suspended solids of filtrate decreases with fly ash dosage but the toxic concentrations of heavy metals increases considerably. However at the optimum dosage of 3%, concentrations of heavy metals are within the limits for discharging into the sewers. The correlations of CST with the dewatering characteristics such as specific resistance, filter yield and corrected filter yield are established. These correlations can be used to obtain a quick prediction on dewaterability.

scholarly journals Location of Biorefineries Based on Olive-Derived Biomass in Andalusia, Spain

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3052
Author(s):  
Diego Cardoza ◽  
Inmaculada Romero ◽  
Teresa Martínez ◽  
Encarnación Ruiz ◽  
Francisco J. Gallego ◽  
...  
Keyword(s):  
Rural Areas ◽  
Raw Materials ◽  
Value Added ◽  
Olive Tree ◽  
Point Of View ◽  
Industrial Wastes ◽  
Olive Pomace ◽  
Crop Fields ◽  
Lignocellulosic Feedstock ◽  
Olive Stones

A biorefinery integrated process based on lignocellulosic feedstock is especially interesting in rural areas with a high density of agricultural and agro-industrial wastes, which is the case for olive crop areas and their associated industries. In the region of Andalusia, in the south of Spain, the provinces of Jaén, Córdoba and Seville accumulate more than 70% of the olive wastes generated in Spain. Therefore, the valorisation of these wastes is a matter of interest from both an environmental and a social point of view. The olive biorefinery involves a multi-product process from different raw materials: olive leaves, exhausted olive pomace, olive stones and olive tree pruning residues. Biorefinery processes associated with these wastes would allow their valorisation to produce bioenergy and high value-added renewable products. In this work, using geographic information system tools, the biomass from olive crop fields, mills and olive pomace-extracting industries, where these wastes are generated, was determined and quantified in the study area. In addition, the vulnerability of the territory was evaluated through an environmental and territorial analysis that allowed for the determination of the reception capacity of the study area. Then, information layers corresponding to the availability of the four biomass wastes, and layers corresponding to the environmental fragility of the study area were overlapped and they resulted in an overall map. This made it possible to identify the best areas for the implementation of the biorefineries based on olive-derived biomass. Finally, as an example, three zones were selected for this purpose. These locations corresponded to low fragility areas with a high availability of biomass (more than 300,000 tons/year) in a 30 km radius, which would ensure the biomass supply.

scholarly journals How Far Away Are World Economies from Circularity: Assessing the Capacity of Circular Economy Policy Packages in the Operation of Raw Materials and Industrial Wastes

2021 ◽  
Vol 13 (8) ◽  
pp. 4394
Author(s):  
Margarita Ignatyeva ◽  
Vera Yurak ◽  
Alexey Dushin ◽  
Vladimir Strovsky ◽  
Sergey Zavyalov ◽  
...  
Keyword(s):  
The Netherlands ◽  
Waste Management ◽  
South Korea ◽  
Circular Economy ◽  
Raw Materials ◽  
Industrial Wastes ◽  
New Guidelines ◽  
The 1960S ◽  
Degree Level ◽  
The Eu

Nowadays, circular economy (CE) is on the agenda, however, this concept of closed supply chains originated in the 1960s. The current growing quantity of studies in this area accounts for different discourses except the holistic one, which mixes both approaches—contextual and operating (contextual approach utilizes the thorough examination of the CE theory, stricture of the policy, etc.; the operating one uses any kind of statistical data)—to assess the capacity of circular economy regulatory policy packages (CERPP) in operating raw materials and industrial wastes. This article demonstrates new guidelines for assessing the degree level of capacity (DLC) of CERPPs in the operation of raw materials and industrial wastes by utilizing the apparatus of the fuzzy set theory. It scrupulously surveys current CERPPs in three regions: the EU overall, Finland and Russia; and assesses for eight regions—the EU overall, Finland, Russia, China, Greece, France, the Netherlands and South Korea—the DLC of CERPPs in operating raw materials and industrial wastes. The results show that EU is the best in CE policy and its CERPP is 3R. The following are South Korea and China with the same type of CERPP. Finland, France and the Netherlands have worse results than EU with the type of CERPP called “integrated waste management” because of the absence of a waste hierarchy (reduce, recover, recycle). Russia closes the list with the type of CERPP “basic waste management”.

Analysis of the state of the migration process of the ukrainian population in the context of domestic and international levels

2021 ◽  
Vol 72 (5) ◽  
pp. 110-118
Author(s):  
M. Shkurat ◽  
K. Pavlotska
Keyword(s):  
Social Protection ◽  
Negative Impact ◽  
Migration Policy ◽  
Cash Flows ◽  
The State ◽  
Negative Consequences ◽  
Migration Process ◽  
State Of The Economy ◽  
Migration Flows ◽  
High Level

Analysis of the migration process of the Ukrainian population, which takes place within the state and at the international level during 2014–2019 is carried out in this paper. On the basis of scientific works of domestic scientists and institutes the problems which have not been investigated, and also aspects which have been solved partially are defined. The negative consequences of the Ukrainian migration process on the state of the country are identified. The classification of migration flows of the Ukrainian population according to the reasons of movement is carried out. The main regions and countries which, as of the beginning of 2021, are more attractive to compatriots and are characterized by significant influxes of Ukrainians are identified. The main centers of departure – regions and countries – which are characterized by high level of outflow of Ukrainians are determined, the main problems and reasons that motivate the outflow of Ukrainians are highlighted in this paper. The level of growth of the Ukrainian population in terms of migration flows is defined. The investigation of Ukrainian diasporas, territorial location and analysis of their share in comparison is carried out. The main factors that force the Ukrainian population to move, which affects the demographic situation in Ukraine, the level of employment, as well as the amount of cash flows to the country and the state of the economy as a whole are identified. The main regulations and identified solutions to the migration flows of the domestic population, which were approved and implemented in the period from 2001 to 2019 are compared in this paper. On the basis of current and newly introduced strategies, critical analysis of the ways of regulating the migration process of the Ukrainian population is carried out, the main aspects and problems of the implemented migration policy of Ukraine are determined. The results of the work are to identify the main ways to reduce the negative impact of the migration process on the country's economy and related processes, and strategies to benefit from the movement of citizens of Ukraine, namely: introduction of intellectual security, revision of wages by region, stimulating the process of attracting technology in all spheres of activity and formation of the social protection system.

Sign in / Sign up

Export Citation Format

Share Document