scholarly journals DEVELOPMENT OF TECHNOLOGY FOR THE EXTRACTION OF LEAD AND ZINC OXIDES FROM DUST AND SLAGS DURING THE UTILIZATION OF LEAD PLANT WASTE

2021 ◽  
Vol 2 (446) ◽  
pp. 81-85
Author(s):  
K. Zhantassov ◽  
Z. Bagova ◽  
G. Turebekova ◽  
B. Sapargaliyeva ◽  
G. Pusurmanova
Keyword(s):  
Negative Impact ◽  
Raw Materials ◽  
Selective Extraction ◽  
Optimal Method ◽  
Ferrous Metals ◽  
Lead And Zinc ◽  
Maximum Permissible Concentrations ◽  
Lead Production ◽  
Non Ferrous Metals ◽  
State Of The Environment

The object of the study is lead-containing slag dumps from a lead plant. The slags of the lead plant contain a large number of toxic compounds: lead, zinc, osmium, cadmium, which are dangerous sources of environmental pollution. Due to the open storage of slags, it was found that the maximum permissible concentrations of lead were exceeded. Utilization of lead production slags allows to obtain non-ferrous metals and to reduce the technogenic load on the environment as a result of processing of slags. At the same time, slags are valuable raw materials containing compounds of non-ferrous and rare-earth metals. The article proposes methods for the extraction of lead and zinc from slag waste and selects the optimal method for the selective extraction of zinc and lead oxides from dust and slags of lead production. The proposed technology of continuous carbon-free selective extraction of zinc and lead from the dust of electric steelmaking production allows the use of lead production slag, which is fed into a rotating drum furnace in two oppositely directed streams. During the movement of lead slag in the furnace drum and the burning of the torch, lead and zinc are more completely extracted from the dust-like material, where the transporting object is compressed air, and the purified flue gas after the gas is further purified by means of a smoke pump is released into the atmosphere. When using the proposed selective method for extracting non-ferrous metals, the ecological state of the environment will be improved, and it will also reduce the negative impact on human health due to the disposal of toxic slags from lead production.

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.

scholarly journals COMBINED TECHNOLOGY FOR PROCESSING WASTE DUMPS OF THE BAIZHANSAI MINE

2021 ◽  
Author(s):  
А.Е. Конурбаев ◽  
Г.Н. Ибрагимова ◽  
С.К. Курбаниязов ◽  
Г.А. Жаужанова
Keyword(s):  
Negative Impact ◽  
Electrochemical Activation ◽  
Trace Impurities ◽  
Metal Coatings ◽  
Ferrous Metals ◽  
Waste Dumps ◽  
Lead And Zinc ◽  
Useful Components ◽  
Non Ferrous Metals ◽  
Glass Optics

Статья посвящена теме переработки отвалов рудника Байжансай в Туркестанской области, который, в настоящее время, является местом отходов полиметаллической руды в количестве примерно 6,5 тонн. В материале рассматривается потенциальная возможность применения данных отходов для извлечения полезных компонентов, таких как из цветных металлов - свинец и цинк, из благородных серебро и из редкоземельных - германий, индий, селен, теллур и таллий. При использовании данной переработки можно не только снизить негативное влияние отходов на окружающую среду, но и добыть полиметаллические руды, которые можно использовать в производстве стекол, оптики, в производстве высокоответственных подшипников для двигателей, для защиты антикоррозионных металлопокрытий и во многих других сферах, указанных в данной статье. Авторами было изучено технологическое решение по переработке отходов Байжансая. На основании полученных данных, была разработана технологическая модель, сочетающего в одном аппарате процессы электрохимической активации воды, флокуляции, газонасыщения и разделения микропримесей редких и рассеянных элементов (РРЭ), цветных металлов из технологических растворов и жидких техногенных отходов. Данный модуль является аналогом "классического" аппарата, но преимуществом предложенного модуля является меньшая энерго затратность, более эффективная работа по временным аспектам и по габаритам. The article is devoted to the topic of processing the dumps of the Baizhansai mine in the Turkestan region, whichis a place of waste of polymetallic ores in the amount of about 6.5 tons. The article discusses the potential use of these wastes for the extraction of useful components, such as non-ferrous metals - lead and zinc, precious silver, and rare-earth metals - germanium, indium, selenium, tellurium and thallium. With the use of this processing, it is possible not only to reduce the negative impact of waste on the environment, but also to extract polymetallic ores that can be used in the production of glass, optics, in the production of highly critical bearings for engines, to protect anti-corrosion metal coatings and in many other areas specified in this article. The authors studied the technological solution for the processing of waste from Baizhansai. Based on the data obtained, the authors of the article have developed a technological module that combines in one apparatus the processes of electrochemical activation of water, flocculation, gas saturation and separation of trace impurities of rare and trace elements (RRE), non-ferrous metals from technological solutions and liquid man-made waste. This module is analogous to the "classical" apparatus, but the advantage of the proposed module is lower energy consumption, more efficient work in terms of time and dimensions.

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 The periclase-chromite refractory decomposition by the action of the pulverized coal and gas medium in course of copper-sulfide raw materials processing

2018 ◽  
pp. 31-36
Author(s):  
A. M. Klyushnikov ◽  
E. N. Selivanov ◽  
K. V. Pikulin ◽  
V. V. Belyaev ◽  
A. B. Lebed' ◽  
...  
Keyword(s):  
Surface Layer ◽  
Raw Materials ◽  
Weight Percent ◽  
Pulverized Coal ◽  
Refractory Powder ◽  
Ferrous Metals ◽  
Composition And Structure ◽  
Non Ferrous Metals ◽  
Refractory Surface ◽  
Gas Medium

The investigating results are given for the periclase-chromite refractories' composition and structure which are in contact with the pulverized coal and gas medium in the coppersulfide smelting furnaces. The high-temperature burnt copper concentrate and the sulfur dioxide gas suspensions combined action changes the surface and deep refractories layers chemical composition, with that the impurities content reach the value in weight percent: Fe 54,0, Cu 7,2, Zn 6,4, S 1,8. The refractory's surface layer saturation with the iron and non-ferrous metals oxides decreases the porosity and gives rise to low-melting compositions and eutectics. The refractory decomposition is induced by the shelling of the refractory surface layers with the filled porous taking place in course of the heating-cooling cycling because of the phase's thermal linear expansion coefficients. When the spent refractory disposal, it is feasible to separate mechanically the surface layer for the non-ferrous metals extracting, the rest part can be used for obtaining the refractory powder of various purpose.

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.

scholarly journals The Results of Studying the Technique of Making Golden Horde Products Made of Non-Ferrous Metals (from the Collection of the Volgograd Regional Museum of Local Lore)

2019 ◽  
pp. 61-74
Author(s):  
Kseniya Kovaleva
Keyword(s):  
Raw Materials ◽  
Secondary Raw Materials ◽  
Ferrous Metals ◽  
Subsequent Processing ◽  
Wide Range ◽  
Digital Microscope ◽  
Non Ferrous Metals ◽  
Group 2 ◽  
Large Groups ◽  
Cast Products

Introduction. The article is devoted to the results of tracing research of things made of non-ferrous metals from the collections of Tsarevskoe, Vodyanskoe, and Mechetnoe settlements, stored in the funds of the Volgograd regional museum of local lore. Method. The author used the method of tracing. The digital microscope DigiMicro 2.0. was used to record the results of observation. Analysis. The author studied 63 products and allocated two large groups: 1) cast products and 2) forged products. The study fixed the following operations for cast products: the use of open and closed molds, casting in composite forms, casting by the smelted model, by the impression, liner casting. In group 2, the following methods of forging were singled out: forming forging, punching, drawing and forging of wire, bending, drawing, twisting, hacking, cutting. Soldering was used to connect the elements. After forming, most of the products passed the subsequent processing associated with the removal of defects (primarily post-casting) and the application of decor (hammering, engraving, stamping, polishing). In addition, the decor could be formed during the creation of the mold (cast decor). Results. As a result of the study, it was noted the use of a wide range of techniques and operations with a comparative technological simplicity for most products. It was also noticed that a few things have been specially prepared for the processing, and it demonstrates the use of secondary raw materials.

scholarly journals Assessing possibility of technogenic raw material processing using ultra-low concentrations of sodium cyanide

2020 ◽  
Vol 24 (5) ◽  
pp. 1105-1112
Author(s):  
Anastasia Vasilkova ◽  
◽  
Alexander Byvaltsev ◽  
Olga Khmelnitskaya ◽  
Grigory Voiloshnikov ◽  
...  
Keyword(s):  
Raw Materials ◽  
Sodium Cyanide ◽  
Gold Recovery ◽  
Raw Material ◽  
Ferrous Metals ◽  
Low Concentrations ◽  
Reagent Consumption ◽  
Copper Zinc ◽  
Non Ferrous Metals ◽  
Technogenic Raw Materials

The purpose of the study is to conduct experiments in order to determine the possibility of technogenic gold-bearing raw material cyanidation using ultra-low concentrations of NaCN. Experiments are carried out on the cyanidation of three samples of technogenic raw materials of different composition. The first sample consists of pyrite cinders (Au - 1.8-2.3 g/t, Ag - 13-22 g/t, Fe - 48.52%, Cu - 0.15-0.30%, Zn - 0.3-0.6%). The second sample is represented by the aged tailings of copper-zinc flotation (sample I) with the content of Au - 0.8 g/t, Ag - 7.0 g/t, Fe - 17.2%, Cu - 0.212%, Zn - 0.207%. The next object is the copper-zinc flotation tailings of a concentration plant (sample II), with the following content of Au - 1.22 g/t, Ag - 15.2 g/t, Cu - 0.13%, Zn - 0.23%. It is recommended to use an aqueous wash from non-ferrous metals with subsequent lime treatment as a preliminary processing of pyrite cinders. Cyanidation is carried out at different consumptions of reagent: from 0.075 to 3 kg/t. The experiments have shown that gold recovery in this range of NaCN consumption varies from 42.9 to 44.2%; moreover, a decrease in the reagent consumption allows to reduce the concentration of non-ferrous metal ions in cyanidation solutions. Before cyanidation sample I has also been subjected to aqueous wash to remove acid and non-ferrous metals. NaCN consumption varies from 0.25 to 2.2 kg/t. In this case the extraction of gold amounts to 36.6-46.4%. Cyanidation of tailings (sample II) is carried out in the range of 0.15-1.2 kg/t of NaCN. Gold recovery varies from 24.1 to 30.9%. The cyanidation technology of technogenic raw materials in the field of ultra-low concentrations of sodium cyanide is promising, since it provides acceptable gold recovery under low reagent consumption. For further research in the field of development of an extraction technology of valuable components, the flotation tailings of copper-zinc production (sample II) are chosen as a promising object. It is planned to carry out semi-industrial tests, calculate technical and economic indicators and develop process regulations.

scholarly journals Applied WEEE pre-treatment methods: Opportunities to maximizing the recovery of critical metals

2018 ◽  
Vol 20 (4) ◽  
pp. 706-711 ◽  
Keyword(s):  
Raw Materials ◽  
Hazardous Substances ◽  
Critical Metals ◽  
Treatment Methods ◽  
Treatment Processes ◽  
Ferrous Metals ◽  
General Recommendation ◽  
Recovery Treatment ◽  
Non Ferrous Metals ◽  
Pre Treatment

<p>WEEE is a fast-growing waste stream that includes potentially hazardous substances, but also valuable secondary raw materials, which can be recovered by adequate recycling and recovery treatment. In the last years, the research interest has moved from the conventional recycling (recovery of ferrous and non-ferrous metals, plastic, glass and other “mass relevant” fractions presented in WEEE), to the innovational recycling, aimed to recover trace elements, such as critical metals (CMs) and rare earth elements (REEs). Currently, the majority of CMs and REEs are lost during the pre-treatment processes. In this paper, an overview of the most relevant e-waste categories and products in terms of CMs and REEs presence, a description of currently applied pre-treatment methods and fate of the observed group of metals during pre-processing phase, as well as general recommendation in order to avoid losses of CMs and REEs within the WEEE treatment chain, are elaborated.</p>

scholarly journals Components’ Characterization of End-of-Life Dishwashers

2021 ◽  
Vol 5 (1) ◽  
pp. 84
Author(s):  
Eirini Evangelou ◽  
Georgios N. Anastassakis ◽  
Spyridon Dionysios Karamoutsos ◽  
Athanasios Stergiou
Keyword(s):  
Stainless Steel ◽  
Eddy Current ◽  
Raw Materials ◽  
Electronic Equipment ◽  
Current Sensor ◽  
Magnetic Separator ◽  
Ferrous Metals ◽  
Non Ferrous Metals ◽  
Hand Sorting

The treatment of Wastes of Electrical and Electronic Equipment (WEEE) is a significant source of secondary raw materials. Ferrous and non-ferrous metals, electronic equipment, and plastics are among these materials. One of the most common metals sourced out of WEEE is stainless steel. Dishwashers are common sources of stainless steel, so large amounts of stainless steel can be recovered from them. In this project, dishwashers were submitted to size reduction via shredding, and the shredded products went through a magnetic separator (which separates all the magnetic ferrous components), an eddy current sensor (which separates all the non-ferrous components) and an induction sorting sensor (which removed all the metallic fractions). This procedure led to the following two streams: one with stainless steel, boards, and cables and another stream mainly including plastic. In the next stage, the stainless-steel stream passed through a high-intensity magnetic separator, leading to a magnetic and a non-magnetic stream. Thereafter, hand sorting was applied to both streams which aimed to increase the recovery from each stream.

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