Entity

Time filter

Source Type


Pevzner M.Z.,Ural Mining and Metallurgical Company
Metal Science and Heat Treatment | Year: 2010

Induction heating of a brass strip in a transverse magnetic field is considered, and in particular temperature distribution and the properties obtained in the rolling transverse direction. The effect of heat treatment technology in induction devices of various construction is studied. Recommendations are developed for optimizing this process. © 2010 Springer Science + Business Media, Inc. Source


Neustroev V.I.,Ural Federal University | Karimov K.A.,Ural Federal University | Naboychenko S.S.,Ural Federal University | Matveev A.V.,Ural Mining and Metallurgical Company | Skopov G.V.,Ural Federal University
Tsvetnye Metally | Year: 2013

This article shows the urgency of improvement of processing technology of complex polymetallic raw materials containing significant amount of toxic impurities (arsenic and lead). Practice of Ural non-ferrous metallurgy enterprises has shown that behavior of almost whole amount of processed ores is complex. Many authors have carried out the researches, which testify the fact that primary passing of the biggest part of arsenic (along with zinc, lead and other metals with high steam tension (metals and their compounds)) to gaseous phase (dusts and sublimates) happens during the smelting in various aggregates. Various technologies are used for processing of these dusts and sublimates. At the same time, once again, these technologies lead to formation of intermediate products, concentrated with arsenic. Thereby, harmful and toxic impurities circulate between operations and enterprises. That's why, it is necessary to decrease the number of operations to withdrawing of arsenic, zinc and lead from technological cycle in the preferable form of the products, suitable for following processing. There are given the results of thermodynamic analysis of main reactions of autoclave leaching of matte, obtained from the joint reduction smelting of Vanukov furnace dusts and circulating zinc intermediate products. Assessment of probability of process behavior and obtaining of leaching products is given according to these results. Methods of autoclave leaching of matte are described. There are given the results of experiments in the temperature range of 140-180 °C, acidity range of 10-80 g/dm3, and pressure of 0.4 MPa. Chemism of the reactions is discussed. There are identified the process parameters, which make it possible to carry out the process of selective extraction of copper into solution. At the same time, lead, arsenic and iron stay in the cake. According to this, there can be solved the problem of noble metals, which quantitatively stay in the lead cake. It was found that lead has the sulfate form. Copper is included in the sediment, formed as a result of leaching as Cu3(AsO4)2, and anhydrous and hydrated sulphates. Value of copper extraction reached over 94%. There is proposed the scheme of processing of these materials (mattes), including autoclave leaching as one of the basic operations. Source


Panshin A.M.,Ural Mining and Metallurgical Company | Kozlov P.A.,ZINC Inc | Ivakin D.A.,ZINC Inc | Vyatkin V.N.,ZINC Inc
Tsvetnye Metally | Year: 2013

Processing of difficult chemical products (dusts) of copper industry is very actual for the purpose of extraction of copper, precious metals, zinc, lead and iron. The usage of Waelz process makes it possible to transform zinc, lead and tin from the foregoing raw materials into Waelz oxide. Taking into account the chemical and mineralogical content of raw materials, it is necessary to develop the conditions for efficient extraction of the considered metals. There are considered the thermodynamic characteristics of the processes, taking place with zinc, lead and tin compounds in the conditions of Waelz kiln during the processing of charge on the basis of copper industry middlings. According to the phase analysis, the basic amount of zinc in raw materials has the oxide and sulphide form; the amount of lead has the sulfate form; and the amount of tin has the oxide form. There is shown the possibility of interaction of calcium oxide, zinc and iron sulphides and hydrogen (which is formed during the feeding of water vapour into the furnace) with zinc, lead and tin compounds with following distillation of metals (at the process temperature of 1500-1573 K). The most important factor for the technology development is distillation of lead without its recovery up to the metallic state, because metals accumulation in the rotary furnace leads to the failure of Waelz process. On the basis of experimental data, there are considered the mechanisms of the processes kinetics. According to the data processing, on the basis of the generalized level of heterogeneous reactions, there are defined the activation energies of lead and tin sublimation processes, which contain 63-77 kJ/mole and 66-100 kJ/mole, which corresponds to kinetic and combined area of reactions. The practical application of the considered reactions in Waelz-kiln makes it possible to do the following operations: - selection of optimal content of charge; - intensification of the process of non-ferrous metals distillation; - decreasing of the consumption of reducer (coke fines), which is supplied with raw materials. Source


Panshin A.M.,Ural Mining and Metallurgical Company | Kozlov P.A.,ZINC Inc | Ivakin D.A.,ZINC Inc | Vyatkin V.N.,ZINC Inc
Tsvetnye Metally | Year: 2013

Waelz oxides contain a large amount of halogenides during the primary Waelz process of metallurgical production wastes. It is necessary to remove these impurities before the extraction of zinc into the solution and its electric extraction. Calcination is an efficient method of chlorine and fluorine removement from Waelz oxides. This method makes it possible to concentrate the considered components in a relatively small volume of secondary distillation, for the purpose of which, there is offered the separate technology of metals recovery and recycling. There is researched the kinetics of distillation of chlorine and fluorine compounds during the oxidizing roasting (calcination) of Waelz oxides in pipe furnace. There is substantiated that the distillation of halogenides is carried out in kinetic and allied diffusive-kinetic area, in terms of the nature of Waelz oxide (type of wastes, recycled by Waelz process) and original content of halogenides in this oxide. Activation energy of chlorine distillation varies from 1 to 60 kJ/mole. At the same time, activation energy of fluorine distillation varies from 3-110 kJ/mole. Increasing of calcination temperature and containing time of Waelz oxide in pipe furnace makes it possible to increase the chlorine distillation ratio and fluorine distillation ratio to 92-99% and 91-98% respectively. At the same time, the residual content of chlorine in calcined material is not more than 0.05%, and the residual content of fluorine is not more than 0.01%. This makes it possible to use the hydrometallurgical extraction of zinc into the sulphate solution for calcined Waelz oxides of the products, obtained from wastes. Source


Sabanova M.N.,Sibay Branch of Uchalinsky Ore Dressing and Processing Enterprise | Savin A.G.,Ural Mining and Metallurgical Company | Shadrunova I.V.,Russian Academy of Sciences | Orekhova N.N.,Magnitogorsk State Technical University
Tsvetnye Metally | Year: 2013

To date, more than 110 mln. t of copper slags have been cumulated in the Urals. In recent yeras, the complex approach to the raw materials processing has been widely spread in the world. During the usage of this approach, the copper slags are considered as an additional source of copper. The copper slags processing technology is developed and implemented in Russia at the range of Ural concentration plants, included into the metallurgical complexes. One of directions of solving of old copper slags' filling problems is the processing of these slags on the nearest ore-dressing and processing enterprises, which have formed their own technology, equipment and water circulation for years. Detail research of copper slags of various metallurgical enterprises of Ural region made it possible to systematize and classify these slags. This research had its main tasks: - definition of peculiarities of copper slags for the purpose of forecasting of possibility and grade of copper reextraction from these slags; - definition of influence of pH and Eh parameters of the enterprise's water phase (where the slag flotation is planned) on its flotability. Research of influence of conditioning of circulating water on the slag flotation made it possible to define the direction of development of copper reextraction technology from copper slags at the concentration plants, which process the copper and copper-zinc ores. Source

Discover hidden collaborations