Čeličanske troske iz procesa proizvodnje elektropećnim postupkom kao nusproizvodi

undergraduate thesis

• Title (english): Steel slags from the electric arc furnace process as by-product
• Author: Dario Lučić
• Mentor: Ivan Brnardić (mentor)
• Committee member: Tamara Holjevac-Grgurić (predsjednik povjerenstva)
• Committee member: Ivan Brnardić (član povjerenstva)
• Committee member: Tahir Sofilić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Metallurgy; Sisak
• Defense date and country: 2017-07-27, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Metallurgy

Abstract

U proizvodnji čelika elektropećnim postupkom nastaju dvije različite vrste troske, crna koja nastaje u elektrolučnoj peći i bijela koja nastaje u lonac-peći. Nastale troske se prije zbrinjavanja miješaju i predaju ovlaštenom sakupljaču uz određene troškove. Da bi trosku, koja kao proizvodni ostatak ima svoju uporabnu vrijednost, tretirali kao nusproizvod, potrebno je zadovoljiti određene uvjete, od kojih je najvažniji utvrđivanje fizikalno-kemijskih karakteristika.
U ovom radu su uspoređene crna i bijela troska s obzirom na njihove fizikalno-kemijske karakteristike te, s obzirom na različitosti prikazane su mogućnosti upotrebe istih. Prema literaturnim podacima obje troske su neopasni otpad, a kao takav se mogu koristiti u razne svrhe (cementnoj industriji, cestogradnji kao zamjena prirodnih mineralnih agregata, poljoprivredi kao poboljšivači tla itd). Kemijski sastav troski je pokazao da se bijela troska od crne najviše razlikuje po sadržaju Ca i Mg zbog čega se ove troske ne bi smjele miješati. Naime, s obzirom na navedeno, svaka od njih može pronaći svoju specifičnu namjenu i mjesto na tržištu. Stoga bi trebalo navedene troske, uz zadovoljavanje zakonom propisanih uvjeta, preimenovati iz otpada u nusproizvod, a time bi se umjesto odlaganja troske, iste predale kupcima, što bi pridonijelo smanjenju troškova proizvodnje sirovog čelika te u konačnici dovelo do približavanja procesa proizvodnje čelika načelima kružnog gospodarstva.

Abstract (english)

In the production of steel by the electric arc furnace (EAF) process two different types of slags were produced, EAF slag or black slag and ladle furnace (LF) slag or a white slag. Produced slags prior to disposal were mixed and handed to a licensed waste collector with certain costs. In order to treat slags, remains from production with its usage value, as a co product, it is necessary to meet certain conditions of which the most important are physico-chemical characteristics.
In this paper the black and white slag were compared through their physico-chemical characteristics, and regarding their differences, the possibilities of using them were shown. According the literature it was established that both slags are non-hazardous waste, and as such can be used for various purposes (cement industry, road construction as a substitute for natural mineral aggregates, agriculture for soil improvement etc.). The chemical composition of the slags showed that the white slag from black differs most in the content of Ca and Mg so that those slags should be collected separately. Namely, with regard to the above, each of them can find their specific purpose and a place in the market. Therefore, mentioned slags, through meeting the legal issued conditions, should be renamed from the waste to co-product, and therefore instead of disposal slag should be handed to customers, which would contribute to reducing the production cost of crude steel and at the end to the approaching of steel production process toward principles of the circular economy.

• Keywords: crna troska; bijela troska; čelik; elektropećni postupak
• Keywords (english): black slag; white slag; steel; electric arc furnace process
• Language: croatian
• URN:NBN: urn:nbn:hr:115:768107
• Study programme: Title: Metallurgy; specializations in: Metallurgical Engineering, Industrial Ecology; Course: Industrial Ecology; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka metalurgije (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka metalurgije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2017-08-30 09:11:37