跟读练习: What Is Basic Oxygen Furnace - Understanding the basic oxygen process. - 通过YouTube学习英语口语
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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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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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背景与背景
在当今快速发展的科技时代，钢铁制造是一个重要的工业过程，而基本氧炉（Basic Oxygen Furnace，BOF）则是这一过程的关键技术之一。通过利用纯氧来替代传统空气，基本氧炉可以在短时间内将熔融铁转换为高质量的钢。这一内容在《James Sword Engineering Channel》的视频中得到了详细介绍。了解基本氧炉的工作原理不仅能够增进对钢铁生产的知识，还能帮助提升英语能力，特别是在与工业和工程相关的术语方面。
日常交流中的五个重要短语
- "基本氧炉能在20分钟内将熔融铁转化为钢。" - 增进对钢铁制造过程的理解。
- "氧与钢中的杂质反应形成炉渣。" - 学习如何描述化学反应。
- "氧气通过4到6个喷嘴吹入熔融铁中。" - 增强关于工程设备的描述能力。
- "温度超过1700摄氏度。" - 学习如何说明高温条件。
- "调节加入的助熔剂。" - 理解工艺调整的重要性。
逐步跟读指导
要有效提升英语发音和口语能力，可以通过观察和模仿视频中的对白来练习。以下是一些实用的步骤，可以帮助您完成这项挑战：
- 观看视频：初次观看时，专注于理解内容，不需要过于关注单词的细节。
- 逐句跟读：暂停视频，逐句仔细聆听并模仿说话者的发音和语调。在这一过程中，您可以利用"shadow speech"技术，努力复述出与说话者相似的语音效果，以此来提高英语发音。
- 记录自己：用录音工具录制您自己的声响与说话者进行对比，这能帮助您识别发音上的差距。
- 反复练习：将不熟悉的短语和句子反复跟读，直到您能够流利、自信地表达。
- 与他人交流：尝试与朋友或学习伙伴一起复述这些短语，通过英语口语练习来加深印象，提升流利度。
通过结合视频内容和有效的跟读练习，您不仅可以理解钢铁生产的复杂过程，还能在过程中提高自己的英语能力，随时随地都能利用看YouTube学英语的方法进行学习，有效地掌握新知识。
什么是跟读法？
跟读法 (Shadowing) 是一种有科学依据的语言学习技巧，最初开发用于专业口译员的培训，并由多语言者Alexander Arguelles博士普及。这个方法简单而强大：您在听英语母语原声的同时立即大声重复——就像是一个延迟1-2秒紧跟说话者的影子。与被动听力或语法练习不同，跟读法强迫您的大脑和口腔肌肉同时处理并模仿真实的讲话模式。研究表明它能显着提高发音准确性，语调，节奏，连读，听力理解和口语流利度——使其成为雅思口语备考和真实英语交流最有效的方法之一。