scholarly journals Hydrochemical cleaning of gold-containing cathode deposits from heavy non-ferrous metal impurities

2020 ◽  
Vol 24 (5) ◽  
pp. 1126-1136
Author(s):  
Viktoria Zhmurova ◽  
Keyword(s):  
Experimental Data ◽  
Chemical Composition ◽  
Hydrochloric Acid ◽  
Mass Fraction ◽  
Ferrous Metal ◽  
Precious Metals ◽  
Dispersion Analysis ◽  
Ferrous Metals ◽  
Gold Silver ◽  
Non Ferrous Metals

The purpose of this paper is to conduct the research on hydrochloric acid cleaning of gold-containing cathode deposits from the impurities of heavy non-ferrous metals and mathematical processing of the experimental data obtained by the method of dispersion analysis. The atomic absorption method is used to study the chemical composition of the cathode deposits. The method of dispersion analysis is used to process experimental data. The composition of cathode deposit impurities is studied using x-ray spectral microanalysis. The study of the chemical composition of cathode deposits has shown that their main components are gold, silver, copper, lead, as well as non-metallic impurity compounds (CaO, SiO2, etc.). It is found that the optimal concentration of hydrochloric acid for cleaning gold-containing cathode deposits from heavy non-ferrous metals is 371 kg/m3; the degree of copper transition to solution is 69.06%, lead - 93.9%. The calculation of the expected mass fraction of precious metals in the alloyed gold demonstrates an increase in the mass fraction of gold by 14.08%, silver - by 17.46%. The study of the chemical composition of cathode deposits has also revealed that the main impurities that affect their subsequent processing are copper and lead. The latter fall into the ingot of alloyed gold, which is the target product of gold-bearing ore processing and complicate subsequent refining. The dispersion analysis of experimental data shows that solvent concentration significantly affects the transition degree of heavy non-ferrous metals to the solution starting from the value of 20.1 kg/m3. It is shown that the proposed method allows to increase the content of precious metals in the alloyed gold by 31.54%, as well as to perform maximum transition of copper and lead to the solution. The use of acid leaching of impurities from cathode deposits obtained by cyanide-sorption technology is one of the promising directions for improving the quality of gold-containing alloys and hence the reduction of the cost of refining services.

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.

The Color, Taste and Toxicity of Non-Ferrous Metals

2013 ◽  
Vol 706-708 ◽  
pp. 323-326
Author(s):  
Dong Mei Yu ◽  
Jian Bin Zhang ◽  
Juan Juan Li ◽  
Jian Gang Jia
Keyword(s):  
European Union ◽  
Physical Properties ◽  
Health Hazards ◽  
Engineering Applications ◽  
Ferrous Metals ◽  
Metallic Taste ◽  
Gold Silver ◽  
Mechanical And Physical Properties ◽  
Non Ferrous Metals

The mechanical and physical properties of metals are closely related to engineering applications. As ecological materials, color, taste and toxicity of metals should be taken into consideration. Metals have specific colors, such as gold, silver, bronze and iron. "Metallic taste" is another taste different from the sour, sweet, bitter, saltiness and umami. Directives in European Union reveal different toxicities on the health hazards.

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.

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.

Review Lecture: Metal recycling from scrap and waste materials

1976 ◽  
Vol 351 (1665) ◽  
pp. 151-178 ◽  
Keyword(s):  
Precious Metals ◽  
Advisory Council ◽  
Metal Extraction ◽  
Waste Materials ◽  
Hydrometallurgical Processing ◽  
A Value ◽  
Ferrous Metals ◽  
Metal Recycling ◽  
Copper Refining ◽  
Non Ferrous Metals

Out of a total U. K. consumption of 2.5 million tonnes per annum (Mt/a) of non-ferrous metals with a value of about £1300 M, as much as 33% with a value of £300-400 M, is recovered from scrap. The structure of the industry which makes this important contribution to the economy is briefly outlined and the paper describes the technology by which the various non-ferrous metals are recovered in re-usable form from waste materials. Sections dealing with the following metals provide data on tonnages treated, descriptions of scrap arisings and the processes oper­ated for metal extraction and refining - copper, aluminium, lead, zinc, tin and precious metals. Reference is made to difficulties encountered and the efficiency of reclamation, such as the small amount of zinc recycled as metal. Under future developments, the possible wider use of oxygen in copper refining and hydrometallurgical processing of high value and complex scrap are discussed. Mention is made of the potential for metal recovery for domestic refuse and the rôle of the Waste Management Advisory Council is described.

scholarly journals Anodic Dissolution of Non-Ferrous Metals in a Glycerate-Alkali Electrolyte

2020 ◽  
Vol 989 ◽  
pp. 569-573
Author(s):  
Vladimir A. Valnev ◽  
Vladimir G. Lobanov ◽  
Lev A. Lubnin
Keyword(s):  
Sodium Hydroxide ◽  
Anodic Oxidation ◽  
Anodic Dissolution ◽  
Precious Metals ◽  
Sweep Rate ◽  
Potential Sweep Rate ◽  
Potential Sweep ◽  
Ferrous Metals ◽  
Non Ferrous Metals ◽  
Alkali Electrolyte

Studies have been conducted to assess the possibility of refining a lead collector containing precious metals, with the aim of obtaining lead using an economically viable technology. Studied the patterns of anodic oxidation of lead and impurities in alkaline-water-glycerate electrolytes, depending on the concentration of sodium hydroxide and glycerol in the electrolyte, the potential sweep rate.

Preparation a Scrap of the Electronic Enterprises and its Subsequent Processing

2020 ◽  
Vol 303 ◽  
pp. 79-88
Author(s):  
D.V. Shmidt ◽  
Bashar Issa ◽  
V.Yu. Timofeev
Keyword(s):  
Electronic Waste ◽  
Precious Metals ◽  
Environmental Standards ◽  
Advantages And Disadvantages ◽  
Nickel Zinc ◽  
Ferrous Metals ◽  
Gold Silver ◽  
Valuable Metals ◽  
Electrical Devices ◽  
Modern Technologies

The processing conditions of the of electronic wastes are largely dependent on environmental standards and requirements. Modern technologies for processing electronic waste should meet the increased demand for metals as well as the requirements. Electronic wastes can be classified as hazardous materials, as household and industrial electrical devices, which contain components such as batteries, capacitors, cathode ray tubes, etc. Electronic waste can consist of a large number of components of various sizes, shapes and chemical composition. Some of them contain hazardous metals, including mercury, lead, cadmium. The presence of precious metals in electronic waste such as gold, silver, platinum, palladium, as well as non-ferrous metals (copper, nickel, zinc, tin, etc.) make it attractive for processing. In industry, both hydrometallurgical and pyrometallurgical methods are used to extract valuable metals from electronic waste. Applied technologies may have both advantages and disadvantages.

X-ray fluorescence sorting of non-ferrous metal fractions from municipal solid waste incineration bottom ash processing depending on particle surface properties

2019 ◽  
Vol 38 (2) ◽  
pp. 111-121 ◽  
Author(s):  
Kerstin Pfandl ◽  
Bastian Küppers ◽  
Stefanie Scheiber ◽  
Gerhard Stockinger ◽  
Johannes Holzer ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Ferrous Metal ◽  
Precious Metals ◽  
Waste Incineration ◽  
Residual Fraction ◽  
Chemical Analyses ◽  
Municipal Solid Waste Incineration ◽  
X Ray ◽  
Ferrous Metals ◽  
Pre Treatment

A heavy non-ferrous metal fraction (< 50 mm) of municipal solid waste incineration bottom ashes from wet-mechanical treatment was separated by screening, magnetic separation and eddy-current separation into ferrous metals, non-ferrous metals and residual sub-fractions. The non-ferrous metal fractions were divided and subjected to (i) a washing process, (ii) dry abrasion and (iii) no mechanical pre-treatment to study the effect of resulting different surface properties on a subsequent X-ray fluorescence sorting into precious metals, zinc, copper, brass, stainless steel and a residual fraction. The qualities of the X-ray fluorescence output fractions were investigated by chemical analyses (precious metal fraction and the residual fraction), pyrometallurgical tests and subsequent chemical analyses of the metals and slags produced by the melting processes (zinc, copper, brass and stainless steel fraction). Screening directs brass and stainless steel primarily into the coarser fractions, while copper and residual elements were rather transferred into the finer fractions. X-ray fluorescence sorting yielded zinc, copper, brass, stainless steel and precious metals fractions in marketable qualities. Neither a negative nor a positive impact of mechanical pre-treatment on the composition of these fractions was identified. Solely the yield of the brass fraction in the grain size 16–20 mm decreased with increasing mechanical pre-treatment. The pre-treatment also had no impact on yield and quality of the products of pyrometallurgical tests.

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.

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