Shadowing Practice: What Is Basic Oxygen Furnace - Understanding the basic oxygen process. - Learn English Speaking with Video
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Did you know that the basic oxygen furnace can convert molten iron into steel in just 20 minutes?
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In this video, you will learn in detail about the basic oxygen furnace, a key technology in steel production.
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Welcome to James Sword Engineering Channel.
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don't forget to like share comment
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and also subscribe to the channel the basic oxygen furnace is
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essentially a giant tank lined with refractory materials to withstand the
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intense heat the furnace is heated to around 1700 degrees celsius
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and then oxygen is blown to start the refining process the
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oxygen reacts with the impurities in the steel such as carbon
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and silicon to create a slag
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that is removed from the furnace this leaves behind high quality
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steel with a much lower carbon content brief history about the
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basic oxygen furnace in the late 1940s a swiss engineer named robert dur experimented with the bessemer converter process
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and discovered a better way to produce high quality steel faster
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he blasted pure oxygen into the furnace instead of air
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that contains only 20 of oxygen
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which is used in the bessemer process he found out that oxygen removed carbon from the molten iron more effectively.
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The process was further developed by an Austrian company called Voest, which is presently known as Voestalpine in the Austrian cities Linz and Donowitz.
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That is why it can also be called Linz-Donowitz process or LD process.
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How does the basic oxygen process work in steel making?
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This steel making process begins with pig iron.
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The pig iron is smelted in a blast furnace after
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which it is poured into a ladle and taken to the basic oxygen furnace.
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In this furnace, The hot metal or pig iron from the blast furnace
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and steel scraps are charged and loaded into the furnace that is tilted about 45 degrees.
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The converter is then placed in an upright position.
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Oxygen is turned on and a water-cooled lance is lowered down into it.
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The lance blows 99% pure oxygen into the charge for about 20 minutes causing oxidation of the elements.
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The oxidation reactions in the converter cause temperatures to rise above 1700 degrees Celsius.
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This melts the scrap and reduces the carbon content of the steel by burning it to form carbon monoxide or carbon dioxide.
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It also creates silicon oxides and other impurities.
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To fine-tune the steel characteristics, fluxes such as burnt lime or dolomite are added to form slag, which absorbs impurities of the steelmaking.
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These adjustments are necessary to achieve the desired quality and ensure the steel meets specific industry standards.
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The chemical compositions, temperature and charging weight of the iron ore are often controlled automatically by a computer.
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The tapping process is the final part of the process, where the slag is then separated from the steel.
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And the refined steel is transferred into the ladles for further processing or subsequent casting.
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The two major types of basic oxygen furnaces involve these steps.
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They include a top-blown basic oxygen furnace and a bottom-blown basic oxygen furnace.
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A top-blown basic oxygen furnace is equipped with a water-cooled oxygen
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lance for blowing oxygen into the pig iron through four to six nozzles.
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A bottom-blown oxygen furnace, also known as Q-BOP, is a less common method.
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Oxygen is injected with lime powder through the two years located at the bottom of the vessel.
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Various parts of a basic oxygen furnace.
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The shell, it is the main body of the basic oxygen furnace and it is made from steel.
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It is strong, durable, and tough the shell does not melt
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because of the refractory lining the refractory lining the refractory lining is a special type of material
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that can reflect
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and withstand heat the refractory lining performs two functions the first is to help retain the heat in the furnace so
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that less energy is required to keep the furnace at operating
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temperature the second function is to protect the steel shell from
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the furnace heat the water cooled oxygen lance the water cooled oxygen lance provides the oxygen to the furnace.
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The lance is watercooled so that it will not melt in the furnace.
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The slagging hole.
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The slagging hole is like a sprout where the slag can be poured out when necessary.
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The tapping hole.
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The tapping hole is used to remove the molten steel from the furnace when the desired quality has been attained.
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The main difference between a basic oxygen furnace and the Bessemer converter is that the basic oxygen furnace uses pure oxygen,
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while the Bessemer converter uses air, which contains nitrogen that can harm some steel grades.
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Also, the main difference between a basic oxygen furnace
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and an electric arc furnace is the type of raw materials they use and the process to create steel.
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For the raw materials, the basic oxygen furnace uses molten pig iron and recycled steel, while the electric arc furnace uses recycled steel.
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For the process, in the basic oxygen furnace, oxygen is blown to reduce the carbon content of the molten iron,
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while an electric arc furnace uses electric arcs to melt the scrap steel.
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Advantages of basic oxygen furnace.
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1. Highly efficient.
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Produces large quantities of steel in a relatively short time compared to other methods.
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2. Lower operational costs, especially when using molten iron from a blast furnace.
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3. Can produce a wide range of steel grades, making it suitable for various applications.
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Woordenschat en spreektips bij deze les
Deze spreekles op niveau C1 is gebaseerd op de video “What Is Basic Oxygen Furnace - Understanding the basic oxygen process”. Deze woorden komen het vaakst terug: furnace, oxygen, steel, process, iron. Deze video bevat 68 zinnen en 902 woorden om na te spreken. Het gesproken deel duurt 5:38. De spreker praat in een natuurlijk tempo van ongeveer 160 woorden per minuut, dicht bij een alledaags gesprek. Slechts 71% van de woorden hoort bij de 3.000 meest gebruikte Engelse woorden, dus de woordenschat is pittig.
Belangrijke woorden in deze video
De 15 moeilijkste woorden uit de video, met uitspraak en betekenis:
| Woord | Uitspraak | Betekenis |
|---|---|---|
| furnace zelfstandig naamwoord | /ˈfɝnɪs/ | ketel |
| melt werkwoord | /mɛlt/ | smelten, laten smelten |
| slag zelfstandig naamwoord | /ˈslæɡ/ | slak |
| lance zelfstandig naamwoord | /læns/ | lans |
| refractory bijvoeglijk naamwoord | /ɹɪˈfɹæk.tə.ɹi/ | weerbarstig, halsstarrig |
| impurity zelfstandig naamwoord | /ɪmˈpjɝɪti/ | onzuiverheid, onreinheid |
| scrap zelfstandig naamwoord | /ˈskɹæp/ | restje |
| ladle zelfstandig naamwoord | /ˈleɪ.dəl/ | pollepel, opscheplepel |
| oxidation zelfstandig naamwoord | /ɒksɪˈdeɪʃ(ə)n/ | oxidatie |
| recycle werkwoord | /ɹəˈsaɪkəl/ | recycleren, recyclen |
| withstand werkwoord | /wɪðˈstænd/ | weerstaan |
| lime zelfstandig naamwoord | /laɪm/ | limoen, limoenenboom |
| silicon zelfstandig naamwoord | /ˈsɪləˌkɑn/ | silicium |
| dolomite zelfstandig naamwoord | /ˈdoʊ.ləˌmaɪt/ | dolomiet |
| inject werkwoord | /ɪnˈd͡ʒɛkt/ | injecteren, inspuiten |
Phrasal verbs die je zult horen
| Woord | Betekenis |
|---|---|
| find out werkwoord | ontdekken, onderzoeken |
| leave behind werkwoord | achterlaten |
Uitspraak om op te letten
- Lange woorden — let op de klemtoon: refractory /ɹɪˈfɹæk.tə.ɹi/, oxidation /ɒksɪˈdeɪʃ(ə)n/, characteristic /ˌkæɹ(ə)ktəˈɹɪstɪk/
Klanken die Nederlandstaligen lastig vinden:
- Stemhebbende eindmedeklinker — /b/, /d/, /g/, /z/, /v/ niet verscherpen: slag /ˈslæɡ/, withstand /wɪðˈstænd/, monoxide /məˈnɒksʌɪd/, oxide /ˈɑksaɪd/, dioxide /daɪˈɑksaɪd/
- /æ/ — opener dan de Nederlandse “e”: slag /ˈslæɡ/, lance /læns/, refractory /ɹɪˈfɹæk.tə.ɹi/, scrap /ˈskɹæp/, withstand /wɪðˈstænd/
- /w/ — met ronde lippen: withstand /wɪðˈstænd/, equip /ɪˈkwɪp/, quantity /ˈkwɑn(t)ɪti/
Zo oefen je met deze video
- Luister de hele video één keer zonder te spreken en noteer de woorden die je niet kent.
- Begin op 0,75× snelheid, spreek zin voor zin na en ga terug naar normale snelheid zodra het makkelijk gaat.
- Neem jezelf op en vergelijk met het origineel; let daarbij op woorden als furnace, melt, slag.
Wat is de Shadowing-techniek?
Shadowing is een wetenschappelijk onderbouwde taalleermethode die oorspronkelijk is ontwikkeld voor professionele tolkentraining en gepopulariseerd door polyglot Dr. Alexander Arguelles. De methode is eenvoudig maar krachtig: je luistert naar native Engelse audio en herhaalt het onmiddellijk hardop — als een schaduw die de spreker volgt met slechts 1–2 seconden vertraging. In tegenstelling tot passief luisteren of grammaticadrills, dwingt shadowing je hersenen en mondspieren om echte spraakpatronen tegelijkertijd te verwerken en te reproduceren. Onderzoek toont aan dat het de uitspraaknauwkeurigheid, intonatie, ritme, verbonden spraak, luisterbegrip en spreekvaardigheid aanzienlijk verbetert — waardoor het een van de meest effectieve methoden is voor IELTS Speaking-voorbereiding en echte Engelse communicatie.