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Bydałek, A. W.

doi:10.1023/a:1012414110569

Cited by 8 publications

(7 citation statements)

References 1 publication

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“…At the first stage of melting, in the temperature range 1900 < T < 2000 (°C), when the main components of the charge are supplied in liquid-phase calcium carbide, occur the following reactions [38,41]: When calcium carbide reacted with the target oxides and the consumption of carbon in a volume of the stoichiometric required amount, the chemical equilibrium of the initial reactions were violated [42]:…”

Section: Features Of Chemism Of the Developed Plasma Carbothermal Pro...mentioning

confidence: 99%

Development and investigation of the technological process of plasma carbothermal reduction of slag from secondary metallurgy of aluminum

Sakhvadze¹,

Janelidze

Mikadze

2022

Metall Mater Eng

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Based on a critical analysis of the current state and prospects of development of the problem of pyrometallurgical recovery/extraction of aluminum from aluminum-bearing industrial waste, the need to replace traditional, electrocarbonothermic processes and melting process units with innovative, plasma carbothermal processes and furnace-reactors, with the possibility of reverse feeding and recovery of gasified during melting metal and metal oxide components is substantiated. On the basis of this analysis a new technological scheme of smelting with a new design of plasma-arc furnace-reactor, which provides a solution to the problem using a special hollow double-shell graphite cathode connected to the system of circulating supply of gases separated from the reaction zone, was developed and presented. The proposed technological scheme also differs in the use of such highly active liquid and gaseous reagents as carbon-containing reducing agents as calcium carbide (CaC2) and methane (CH4). The main features of chemism of reducing processes are described. It is shown that by replacing traditional coke with anodized calcium carbide and natural gas (methane) the recovery rate of aluminum oxide (Al 29-34%) and silica (SiO2) and hematite (Fe2O3) present with it increases to 80-99%. Specific power consumption is reduced by 35-40%, the 90-95% reduction in the loss of target elements, the 80% reduction in the emission of greenhouse carbon dioxide, which is replaced by a very valuable recyclable synthesis gas - CO-H2. By additionally feeding separate portions of quartzite and steel-rolling scale in the furnace-reactor, a complex alloy-ligature of Fe-Si-Al-Ca system is melted, with the ratio of components: 1:[1.3-2]:[1.3-1.2]:[0.9-1.25]. With the introduction into industrial practice of the plasma carbothermal process of aluminum reduction from secondary aluminum dumping slags accumulated in the world (4 million tons/year), it will be possible to return up to 1-1.5 million tons/year of aluminum to the production processing cycle.

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Section: Features Of Chemism Of the Developed Plasma Carbothermal Pro...mentioning

confidence: 99%

Development and investigation of the technological process of plasma carbothermal reduction of slag from secondary metallurgy of aluminum

Sakhvadze¹,

Janelidze

Mikadze

2022

Metall Mater Eng

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“…They are applied in conjunction with the enhancers of ionic reactions in slag and with fluxes correcting physical -chemical properties of slag. The main physicochemical benefits of the application of such substances rely on their interaction with a properly prepared -both in terms of composition and properties of surface -active agents -slag layer [16,17]. Such an approach is a novelty in the pyrometallurgy of copper and currently is the object of patent application [18].…”

Section: Reagentsmentioning

confidence: 99%

The Concept of Slag Decopperisation in the Flash Furnace Process by Use of Complex Reagents

Bydałek¹,

Wołczyński²,

Biernat³

2015

Archives of Metallurgy and Materials

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The article presents an outline of the new technology of pyrometallurgical processing of slag in the direct-to-blister process. The analysis is based on the example of the production process of KGHM Polish Copper SA. A new way of implementing the technology of recovery of copper from the flash furnace slag by means of different feedstocks has been proposed. The method of controlling the processes is another innovation discussed in the paper. The presented concept intensify the reduction reactions, using the Carbo-N-Ox method, of copper compounds to forms of metallic phases in the slag. The processes of coagulation are accelerated and the processes crystallization of metallic phases are under control.Keywords: slag, decopperisation, reagents, recycling W artykule przedstawiono zarys nowej technologii pyrometalurgicznego przetwarzania żużli w procesie jednostadialnego otrzymywania miedzi. Zaproponowano nowy sposób realizacji technologii odzyskiwania miedzi z żużli z pieca zawiesinowego z zastosowaniem odmiennych materiałów wsadowych. Zaproponowano sposób sterowania procesami. Proponowana koncepcja prowadzi do intensyfikowania reakcje redukcji związków miedzi, metodą Carbo-N-Ox, do postaci faz metalicznych w żużlu. Przyspieszone też zostaną procesy koagulacji faz metalicznych. Zaproponowany został sposób analizy formowania się faz metalicznych w żużlu.

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“…Carbon removal by slag refining isn't the priority in steelmaking, but can be more important in other alloys, such as ferrochrome [4,5] and ferromanganese [6] alloys. The removal of carbon depends on the mass transfer between the slag-metal interface when the hot metal drops cross the slag layer and fall into the molten pool [7,8]. As a result, the carbide capacity of the refining slags is crucial to the control of the carbon content in the final products.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of carbide capacity in CaO-based ternary systems at 1773k for refining process

Leng

Wang

et al. 2020

J min metall B Metall

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Refining slags is widely used in the production of high-value-added alloys and special steels. The removal of impurities depends on the mass transfer between the slag-metal interface, and the carbide capacity of the refining slags is crucial to control the carbon content in the final products. A phenomenological model is introduced in this article for the calculation of carbide capacity of different CaO-based ternary refining slags. The contour lines of carbide capacity in CaO-Al 2 O 3 -CaF 2 , CaO-SiO 2 -CaF 2 CaO-SiO 2 -MnO systems are calculated based on limited experimental data by the present model. The experimental data within the calculation boundary are compared with the predicted values and satisfactory agreements are observed with the mean deviation being 1.4%, 2.3%, and 1.6%, for these three systems respectively. The present model is powerful and flexible in the calculation of carbide capacity of CaO-based ternary refining slags and can be applied to other systems. Jo u rn al of Min in g a n d Met allu rg y, S ect ion B: Met a llu rgyhttps://doi.org/10.2298/JMMB190110054Y

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Cited by 8 publications

References 1 publication

Development and investigation of the technological process of plasma carbothermal reduction of slag from secondary metallurgy of aluminum

Development and investigation of the technological process of plasma carbothermal reduction of slag from secondary metallurgy of aluminum

The Concept of Slag Decopperisation in the Flash Furnace Process by Use of Complex Reagents

Evaluation of carbide capacity in CaO-based ternary systems at 1773k for refining process

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