Določanje razmerja kovinskih komponent šarže v kupolki

Scientific paper - Original scientific paper

• Title (english): Determining the ratio of the metal components of the charge at the cupola furnace
• Author: Ladislav Lazić
• Author: Martina Lovrenić-Jugović
• Author: Matija Borošić
• Author's institution: University of Zagreb; Faculty of Metallurgy; (Department of Mechanical Metallurgy); (Laboratory of Thermal Technics and Mechanical Engineering)
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Metallurgy

Abstract (slovene)

Talilna peč je najpomembnejša oprema v livarni. Za taljenje litega železa se uporabljajo različne vrste peči. Pri pripravi taline za visoko stopnjo proizvodnje se v obratih za litje železa uporabljajo predvsem kupolke ali električne talilne peči. Glavne prednosti kupolk v primerjavi z električnimi so: enostavna in gospodarna naprava, manj škodljiva za okolje, manjša občutljivost na nizkokakovostne materiale šarže in onesnaževalce, oksidacijske in redukcijske reakcije med taljenjem v kupolki potekajo znotraj talilne cone in nad njo, kar omogoča uporabo visoko oksidiranega in nizkokakovostnega odpadnega materiala, cenejših zlitin in nekovinskih dodatkov. Ena osnovnih tehnoloških težav pri delovanju kupolke je določitev razmerij med komponentami šarže, ki jo sestavljajo koks, topilo in kovinska šarža, da bi ustvarili talino z želeno kemijsko sestavo. V praksi je masno razmerje kovinske šarže in koksa v določenih vrednostih, prav tako tudi skupna masa topila glede na maso koksa. Izkazalo se je, da je glavna težava določitev sestavin kovinskega dela šarže, ki je običajno sestavljena iz odpadkov iz lastne proizvodnje, jeklenega odpada, kupljene sive litine, nodularne litine, silicijevega mangana, ferosilicija itd. V tem prispevku smo z metodo izbire iz razpoložljivega razpona izračunali deleže kovinskih komponent kovinskega dela šarže za izdelavo taline iz sive litine, standardizirane pod oznako EN-GJL-250.

Abstract (english)

The most important equipment in a foundry is the melting furnace. Various types of furnaces have been used for cast iron melting. In cases of melt preparation for production at high capacities, the primary melting methods used in iron casting plants are cupola furnaces or electric melt furnaces. The main advantages of cupola furnaces compared to electric ones are: simple and economical device, less harmful to the environment, less sensitive to low-quality charge materials and contaminants, oxidation and reduction reactions take place within and above the melt zone during cupola melting, which allows the use of highly oxidized and low-quality scrap material, lower prices of alloys and non-metallic additions. One of the basic technological problems in the work of the cupola furnace is to determine the relationships between the charge components consisting of coke, flux, and metal charge to obtain a melt of a given chemical composition. In practice, the mass ratio of metal charge and coke is in certain mass relations as well as the total mass of flux in relation to the mass of coke. It turns out that the main problem is to determine the components of the metal part of the charge, which usually consists of waste of own production, steel scrap, purchased cast iron, nodular cast iron, silicon manganese, ferrosilicon, etc. In this paper, using the method of selection from the available range, the proportions of metal components of the metal part of the charge were calculated to produce a gray cast iron melt standardized with the code EN-GJL-250.

• Keywords (slovene): kupolka; šarža; kovina; komponente
• Keywords (english): cupola furnace; charge; metal; components
• Language: slovene
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Livarski vestnik
• Numbering: vol. 70, no. 3, pp. 136-144
• p-ISSN: 0024-5135
• URN:NBN: urn:nbn:hr:115:140605
• Publication: 2023
• Project: Number: KK.01.1.1.02.0022; Title (croatian): Virtulab – Integrirani laboratorij za primarne i sekundarne sirovine; Acronym: Virtulab; Leader: Sibila Borojević Šoštarić; Jurisdiction: Croatia; Funding stream: European Regional Development Fund
• Conference: Title: 62nd IFC PORTOROZ 2022; Location: Portorož, Slovenia; Organizer: Društvo livarjev Slovenije; Start date: 2022-09-14; End date: 2022-09-16
• Document URL: https://www.drustvo-livarjev.si/index.php?module=vestnik&op=show&vestnikId=89
• Document URL: https://www.drustvo-livarjev.si/index.php?module=vestnik&op=show&vestnikId=89
• Type of resource: Text
• Access conditions: Closed access
• Created on: 2024-05-04 19:26:53