Shimov G.V.,Ural Federal University |
Shalaeva M.S.,JSC Revda Non Ferrous Metals Processing Works |
Sladkov M.M.,JSC Sredneuralsky Copper Smelter
Tsvetnye Metally | Year: 2015
Traditionally, copper and brass tubes are supplied in soft condition after annealing, but some copper and brass tubes, such as tube radiators manufactured in accordance with the Standard GOST 529-78, comes in the solid state, that is, without a finish heat treatment. In this case, the tube wall of residual stresses may be considered. These certainly affect the operational durability of tubes. Residual stresses lead to strain and to cracking tubes. Cracking of copper and brass tubes (for example, heat exchanger, tube radiator tubes) during their operation is connected with the corrosion processes and the presence of residual tensile stresses in the tube wall. The proper evaluation of the performance needs to know the value of residual stresses and their distribution in the tube wall. A computer simulation of the process of drawing brass tubes is made. The calculation procedure of residual stresses in the tubes is described. The procedure is based on the calculation of the elastic and thermal discharge after tube dies. There are calculated the residual stresses in the brass tubes 8,0×0,2 mm made of L96 alloy after drawing. The distribution of residual stresses on the tube wall is also calculated. There are defined the presence and value of the tensile residual stresses on the outer surface of the tube. Using the computer simulation results as primary data, the described technique allows the calculation to establish the value and distribution of residual stresses in the tube wall. Information about the sign and magnitude of the residual stresses in the tube wall is needed to evaluate the corrosion resistance of copper and brass tubes during operation.
Gazaleeva G.I.,JSC Uralmekhanobr |
Mamonov S.V.,JSC Uralmekhanobr |
Sladkov M.M.,JSC Sredneuralsky Copper Smelter |
Kutepov A.V.,JSC Sredneuralsky Copper Smelter
Tsvetnye Metally | Year: 2016
Nowadays, accumulated volumes of Russian technogenic wastes in almost match the volume of mineral deposits, set on balance. The average level of industrial waste use in Russia makes up only 53%, while the percentage of production waste use as secondary raw materials does not exceed 11%. The percentage of industrial waste utilizing in Europe and in USA, makes up 85% and 95%, respectively. This article describes the classification of beneficiation methods for major technogenic raw materials of metallurgical industry. The offered beneficiation technology of slowly cooled slags of copper smelting production at Sredneuralsky Copper Smelter (UMMC-Holding) is an example of intensification of technogenic raw materials beneficiation processes. Research result is the significant increase of copper extraction from flowing slags at concentration plant. The study of the phase composition of slags shows the prospectivity of a slow slag cooling method due to recrystallization and transition of primary copper minerals to the secondary ones. The study of copper mineral release degree in flowing slags shows the mass fraction of released copper mineral grains in a flotation grade size of -0.071 mm, equal to 58.95%. Content of such grains with the same size in samples of slowly cooled slag is from 85.83% to 86.73%. The process flowsheet is given for the flotation size grade (-0.071 mm) and consists of three main, one scavenger and two recleaner flotation operations with aftergrinding of middling products. A reagent mode differed from a plant mode by decrease of slurry pH from 11-12 to 8-9. Industrial tests of an accumulated batch of slowly cooled slags at the Concentrating plant of Sredneuralsky Copper Smelter show the efficiency of such processing: extraction of copper into copper concentrate is increased by 15-19%, and decrease of copper content in tailings makes up 0.17%. The process figure effect enhancing is based on coarsening of valuable slag mineral grains and improving the phase analysis due to its slow cooling.
Abdulazizov B.V.,JSC Sredneuralsky Copper Smelter |
Sladkov M.M.,JSC Sredneuralsky Copper Smelter |
Gotenko S.N.,JSC Sredneuralsky Copper Smelter |
Borisov A.L.,JSC Sredneuralsky Copper Smelter |
Ladeyshchikov A.V.,JSC Sredneuralsky Copper Smelter
Tsvetnye Metally | Year: 2014
Vanukov Furnace No. 2 was placed in operation in 2009, within reconstruction of metallurgical complex, located on the site of JSC "Sredneuralsky Copper Smelter", which allowed to increase the blister copper output by 1,5 times. Along with application of new production modes, there was realized the program of modernization and re-equipment measures, focused on further improvement of metallurgical complex operation. In this regard, in the period from 2010 till 2013, there were realized the measures, aimed on provision of rhythmic unloading of feedstock and extending of storage facilities. At the same time, new hangar was built and placed in operation for defrosting of incoming stock during cold autumn-winter period. Capacity of this hangar was 2500 t of copper concentrate per day. Construction of new sections in storage house for provision of additional storage area for main copper concentrates is carried out. Improvement of charge preparation quality is achieved by means of separate hopper feeding of components. Installation of modern weighting hoppers increased the material dosing accuracy for melting furnaces. Automatic sampling facilities were designed and installed for the purpose of controlling of chemical composition and humidity level of charging material. Range of measures, directed to modernization of water-cooling elements and furnace baffles, is realized, and more resistive refractory materials are selected. All the foregoing leads to improvement of reliability of melting furnaces and to extension of inter-maintenance period. System of evacuation for process and aspiration gases from melting facilities is improved. Melting and converting modes (using matte, containing 52-56% of copper) are worked out to increase copper smelting shop productivity.