scholarly journals Modern electrochemical processes and technologies in ionic melts

2003 ◽  
Vol 39 (1-2) ◽  
pp. 93-107 ◽  
Author(s):  
A. Omelchuk ◽  
S.V. Volkov ◽  
O.G. Zarubitskii
Keyword(s):  
Ferrous Metal ◽  
Metal Alloys ◽  
High Quality ◽  
Bipolar Electrodes ◽  
Electrochemical Processes ◽  
Ionic Melts ◽  
Ferrous Metals ◽  
Non Ferrous Metals ◽  
Metallic Impurities

An analysis of the known methods for the electrochemical purification of non-ferrous metals in ionic melts is presented. A comparative estimation of the results of the electrochemical purification of non-ferrous metals by different methods has been performed. The main regularities of the electrochemical behavior of non-ferrous metals in conventional and electrode micro-spacing electrolysis are presented. It has been found that when electrolyzing some metals, e. g. bismuth, gallium, there is either no mass exchange between the electrodes, or it occurs under filtration conditions. It has been shown that the electrode micro-spacing processes provide a high quality of non-ferrous metals purification at low specific consumption of electric power and reagents. The use of bipolar electrodes and ?-alumina diaphragms hinders the transfer of metallic impurities from the anode to the cathode. The effects revealed were used to develop new processes for the separation of non-ferrous metal alloys in ionic melts; most of them have been put into practice in non-ferrous metallurgy.

Рентгенофлюоресцентный анализ металлических изделий из скального погребения Узуур-Гялана (Монгольский Алтай)

2021 ◽  
Author(s):  
Мунхбаяр Б.Ч. ◽  
Keyword(s):  
Chemical Composition ◽  
Comparative Studies ◽  
Ferrous Metal ◽  
Tenth Century ◽  
Cultural Relations ◽  
Local Characteristics ◽  
Ferrous Metals ◽  
Metal Products ◽  
Non Ferrous Metals ◽  
The Comparative Study

The article describes the metalwork of the Uzuur Gyalan rock burial, popularly known online in 2016 as the «Adidas Mummy». The definitions and chemical composition of the metalware were compared with those of the time in the region. According to the results of the comparative study, the composition of the bronze mirror is very different from other bronze objects. However, bridles, saddle plaques, and ligaments are similar to the main non-ferrous metals in the region, but appear to have local characteristics. Further detailed comparative studies of the chemical composition of non-ferrous metal products in the tenth century are important steps in establishing regional cultural relations.

scholarly journals A Study on the Synergistic Change of Non-ferrous Metal Futures and Stock Prices in China—Based on the Complex System Synergy Degree

2019 ◽  
Vol 267 ◽  
pp. 04009
Author(s):  
Qingxin Kong ◽  
Shangde Gou
Keyword(s):  
Stock Prices ◽  
Composite System ◽  
Negative Impact ◽  
Ferrous Metal ◽  
Futures Market ◽  
2008 Financial Crisis ◽  
Ferrous Metals ◽  
Metal Market ◽  
Non Ferrous Metals ◽  
The 2008 Financial Crisis

Based on the synergetics perspective, this paper constructs a composite system of non-ferrous metal futures and stock prices, using MATLAB to analyze the data of 3405 trading days from 2004 to 2018 in China. The empirical results show that non-ferrous metal stock prices are generally more orderly than futures prices in the selected period; the price discovery function of aluminum futures is worse than that of copper and zinc; and the 2008 financial crisis has an indelible negative impact on the coordination of China's non-ferrous metals futures market. Finally, this paper discusses whether there are representative metals in the non-ferrous metal market, and makes a brief summary.

Innovating the Recovery and Recycling of Waste-to-Energy Ferrous Metals

2007 ◽  
Author(s):  
Robert Middleton
Keyword(s):  
Ferrous Metal ◽  
Scrap Metal ◽  
Waste To Energy ◽  
Small Stream ◽  
Ferrous Metals ◽  
Metals Recovery ◽  
Recovery System ◽  
Disposal Cost ◽  
Landfill Disposal

Most every one of the approximate 90 operating waste-to-energy facilities in North American have a ferrous metals recovery system to extract these metals from the ash stream before the ash is disposed as a waste. Recovery of this ferrous metal obviously reduces the significant landfill disposal cost and associated ash hauling cost for the facility by reducing the volume of materials being disposed. The volume of the ferrous metals stream typically ranges between 1.0 to 4.0 percent of the incoming waste volume. But for facilities which manage hundreds of thousands of materials per year, this relatively small stream of material in many facilities present such a nuisance that the operators at some plants have a penchant not to bother with it for the tenuous value they have received. The value received has been exposed to extreme variations and uncertainty due from the fragmented scrap metal markets, transportation costs, quality of the recovered product (or lack thereof), cost of recovery, and a number of other constraints and issues, some in the control of the facility operator and some not in the control of the operator. As a result, the attention given to this area is also very variable across facilities, even within the same parent company.

scholarly journals Environmentally Friendly Pyrometallurgical Scheme for Vacuum Separation of Non-Ferrous Metals from Waste Products in Incineration Plants

2021 ◽  
Author(s):  
Sergey Trebukhov ◽  
Valeriy Volodin ◽  
Olga Ulanova ◽  
Alina Nitsenko ◽  
Farkhat Tuleutay
Keyword(s):  
Noble Metals ◽  
Ferrous Metal ◽  
Raw Material ◽  
Thermal Method ◽  
Residual Pressure ◽  
Waste Products ◽  
Ferrous Metals ◽  
Non Ferrous Metals ◽  
Zinc Concentrate ◽  
Separate Product

Abstract Residues from the municipal solid waste processed in incineration plants in European countries are an important raw material to obtain valuable components, including non-ferrous metals. State and private companies specializing in the processing of waste incineration slag as products most often receive concentrates of non-ferrous metals, which, on average, contain, in mass. %: 20÷60 Cu; 10÷30 Zn; 5÷15 Pb; ~ 1 Al; ~ 1 Sn; ~ 1 Fe, up to 50 g/t Аu and up to 3,000 g/t Ag. Concentrates are sent for processing to smelters without taking the cost of zinc into account. The paper presents the study on the separation of metallic zinc into a separate product (zinc concentrate) from the collective concentrate of non-ferrous metals by a vacuum-thermal method, the safest from the environmental point of view. The study was performed with non-ferrous metal concentrate of +0.3-0.8 mm in size, containing wt. %: 68.07 - Cu; 12.4 - Zn; 14.78 - Pb; 0.99 - Al; 1.2 - Sn; 0.15 - Fe, up to 2.0 kg/t - Ag. The material was heat treated at 800÷900℃ with the residual pressure in the system of less than 0.13 kPa. Zinc concentrate was obtained, containing more than 96% of the main component. At the same time, the Cu content increased by 14.09% in the residue from the heat-vacuum treatment. Other metals (Pb, Al, Sn) including noble metals were also concentrated in the residue. The results of the study show that it is possible to separate zinc into a separate product from non-ferrous metal concentrates containing more than 10% Zn in the initial material by the proposed method.

Melting of Low-Level Radioactive Non-Ferrous Metal for Release

2007 ◽  
Author(s):  
Ulrich Quade ◽  
Thomas Kluth ◽  
Rainer Kreh
Keyword(s):  
Ferrous Metal ◽  
World Market ◽  
Market Prices ◽  
Low Level ◽  
Nuclear Decommissioning ◽  
Ferrous Metals ◽  
Non Ferrous Metals ◽  
Industrial Reuse ◽  
High Level ◽  
Treatment Procedures

Siempelkamp Nukleartechnik GmbH has gained lots of experience from melting ferrous metals for recycling in the nuclear cycle as well as for release to general reuse. Due to the fact that the world market prices for non-ferrous metals like copper, aluminium or lead raised up in the past and will remain on a high level, recycling of low-level contaminated or activated metallic residues from nuclear decommissioning becomes more important. Based on the established technology for melting of ferrous metals in a medium frequency induction furnace, different melt treatment procedures for each kind of non-ferrous metals were developed and successfully commercially converted. Beside different procedures also different melting techniques such as crucibles, gas burners, ladles etc. are used. Approximately 340 Mg of aluminium, a large part of it with a uranium contamination, have been molten successfully and have met the release criteria of the German Radiation Protection Ordinance. The experience in copper and brass melting is based on a total mass of 200 Mg. Lead melting in a special ladle by using a gas heater results in a total of 420 Mg which could be released. The main goal of melting of non-ferrous metals is release for industrial reuse after treatment. Especially for lead, a cooperation with a German lead manufacturer also for recycling of non releasable lead is being planned.

scholarly journals A Comparison of Two Novel Non-Ferrous Metal Recovery Equations: Development, Similarity and Industrial Significance

2021 ◽  
Author(s):  
E. J. Grimsey
Keyword(s):  
Distribution Coefficient ◽  
Ferrous Metal ◽  
Detailed Comparison ◽  
Distribution Coefficients ◽  
Metal Recovery ◽  
Iron Transfer ◽  
Ferrous Metals ◽  
Non Ferrous Metals ◽  
Constant Distribution

AbstractThe recovery of non-ferrous metals in oxidative sulfide smelting and converting processes and within reductive oxide smelting processes has been previously analyzed using two similar equations which express recovery in terms of iron transfer and a distribution coefficient. A detailed comparison will show that the equations are mathematically identical but with one equation validated only for constant distribution coefficients. The wider applicability of the equation and implications for optimization of metal recovery are discussed.

scholarly journals Touchstones from Early Medieval chamber graves in Ciepłe, Eastern Pomerania

2021 ◽  
Vol 73 (2) ◽  
Author(s):  
Sławomir Wadyl ◽  
Jakub Karczewski
Keyword(s):  
Precious Metals ◽  
The Other ◽  
Reliable Indicator ◽  
Social Standing ◽  
Medieval Period ◽  
Early Medieval ◽  
Early Medieval Period ◽  
Ferrous Metals ◽  
Non Ferrous Metals

The precious metals of the early medieval period were the same as those of today. Knowing their purity was essential, which means that assaying and refining were of great importance. Touchstones have been used to assess the quality of precious metals since antiquity. Stone artefacts initially identified as whetstones were unearthed in two of the most prestigious chamber graves discovered at the cemetery in Ciepłe. Traces of precious and non-ferrous metals on the surface of the object from Grave 42 proved that this artefact was a touchstone. It is probable that the phyllite stone from the other grave served the same purpose. Tools of this type are often found in high-prestige burials in Europe, in some cases together with balance scales and weights, which suggests that the individuals in whose graves they were deposited had access to precious metals. Therefore interpreting touchstones as a reliable indicator of the high social standing of the deceased seems entirely reasonable.

scholarly journals ECOLOGICAL ASPECTS OF THE TECHNOGENIC DEPOSITS PRESERVATION OF NON-FERROUS METALS IN THE NORTH CAUCASUS

2021 ◽  
Vol 13 (2) ◽  
pp. 265-272
Author(s):  
Ivan ALBOROV ◽  
◽  
Fatima TEDEEVA ◽  
Olga BURDZIEVA ◽  
◽  
...  
Keyword(s):  
Negative Impact ◽  
Raw Materials ◽  
Ferrous Metal ◽  
Industrial Building ◽  
North Caucasus ◽  
Mountain Rivers ◽  
The North ◽  
Ferrous Metals ◽  
Non Ferrous Metals ◽  
Waste Deposits

The article presents the results of research on a comprehensive assessment of techno genic waste deposits located in the North Caucasus region, gives a brief description of the material composition of techno genic raw materials, element-by-element quantitative reserves that are part of the accumulated secondary georesources for their possible utilization, production of non-ferrous metals and raw materials for the manufacture of industrial building materials. The article considers the sanitary and ecological parameters of the functioning of man-made raw materials in complex orographic, meteorological and geographical conditions. The critical aspects of the preservation of techno genic waste deposits in the current anthropogenic conditions are identified. The risk factors for the removal of toxic and harmful geomaterials into the water area with significant harm to the flora and ichthyofaunal are identified. For a deeper assessment of the minerals contained in the extracted ore, a unified state register of techno genic waste deposits should be created, Taking into account the high fragmentation of all the above – mentioned process links at the present time , the owners, taking into account the current sanitary and regulatory requirements, must take adequate measures to ensure the regulatory and environmental requirements in accordance with the current Federal Law “On Production and Consumption Waste”. The need for complex processing of waste from mining and processing industries in the North Caucasus is also dictated by environmental aspects due to the high risk of the occupied territories (they are located in floodplain terraced areas of mountain rivers) due to the flooding of mountain rivers, including the high vulnerability of resort and recreational and balneological complexes due to the negative impact of these negative sources. The assessment of the useful components contained in the extracted ore is currently not carried out in full, and the accumulated waste from processing non-ferrous metal ores is used in small volumes.

scholarly journals DISPOSAL OF LEAD PRODUCTION WASTES BY EXTRACTION OF LEAD AND ZINC OXIDES

2021 ◽  
Vol 2 (446) ◽  
pp. 37-44
Author(s):  
Zarina Bagova ◽  
Kurmanbek Zhantassov ◽  
Gaukhar Turebekova ◽  
Bayan Sapargaliyeva ◽  
Shermakhan Shapalov
Keyword(s):  
Negative Impact ◽  
Ferrous Metal ◽  
Selective Extraction ◽  
Toxic Waste ◽  
Metal Compounds ◽  
Zinc Oxides ◽  
Ferrous Metals ◽  
Lead And Zinc ◽  
Lead Production ◽  
Non Ferrous Metals

Information is given about the need to dispose of waste from the Shymkent lead plant in the form of slags, which have accumulated about 2 million tons. It is proved that lead production slags contain a large number of toxic compounds, such as lead, zinc, osmium, and cadmium, which are dangerous sources of environmental pollution. According to the results of X-ray diffractometric analysis and DTA, it was found that the slag of lead produc- tion contains a fairly high number of non-ferrous metal compounds: the content of lead oxide up to 2 %, zinc oxide up to 17% and copper oxide up to 1.25% of the total weight of the sample. The qualitative composition and content of non-ferrous metals of lead slags makes it possible to make the process of recycling toxic waste from lead production technically and economically feasible. The results of preliminary tests allow us to select a technology for more complete and selective extraction of lead and zinc oxides from the slag waste of lead production. When using a selective method for extracting non- ferrous metals, it is expected to improve the ecological state of the environment and reduce the negative impact on human health due to the disposal of toxic slags from lead production. At the same time, a significant contribution is made to the development of the system of rational use of natural and secondary resources.

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