Iron extraction from Blast Furnace (TYS question)

bonkysleuth SG

After getting the molten Fe from the blast furnace we are required to remove the impurities in it. One of the processes involves blowing Oxygen into the molten iron in a container. After blowing in the O2 gas, the temperature of molten iron rises. Why? (a 1 mark question)

I would merely write, it's an exothermic reaction. However the answer given says something like when O2 is blown onto the C on molten iron, molten iron burns, producing lots of heat. This causes temperature to rise.

Do we know that the molten Fe burns when O2 is blown in?thanks

yiha093 SG

brother ,temp risse =/= exothermic meh ? ~.~

and no we do not know fe burns when o2 blown in cause not in syllabus, if thats what u wanted

Darkness_hacker99 SG

Purpose of injecting oxygen into the molten iron is to
- convert the excess carbon to acidic oxide of carbon dioxide --> produces lots of heat.
- create steel.

Also, the process of making iron related products involves lots of heat (to make the metal in molten state), so it wouldn't be surprise if temperature rises upon adding oxygen.

ItchyArmpit SG

urmm i think not in syllabus.. no need care.. i also taking o lvl this yr..

ViewtyKU990 SG

same, taking o this year, dun have such thing.

Darkness_hacker99 SG

Yea, not in the syllabus. But once in a while, questions do surfaces regarding about the usability of Iron directly extracted from Blast Furnace.

"Explain whether the Iron extracted directly from Blast Furnace would be useful." [2 marks]

Students should be able to answer that Iron that were extracted from Blast Furnace were unusable because its pure iron (soft).

If possible, continue by saying : The iron extracted from the blast furnace will then be further processes (i.e. add C to increase strength/ Chromium to make stainless steel).

ViewtyKU990 SG

hmm Darkness_hacker99 can you explain about the part whereby it is soft? Since the question is asking about

"Explain whether the Iron extracted directly from Blast Furnace would be useful."

Why do you have to say about the 'con' of pure iron?

thanks.

Darkness_hacker99 SG

Pure iron isn't useful because it does not enough provide strengths for applications, i.e. bends easily i.e. atoms in the metal slide over each other easily. Talking about bend easily, do you known what is the term given for this?

ViewtyKU990 SG

ductile

yiha093 SG

might as well say it is alloyed to carbon to make steel so that it is stronger righT?

anyway, if 1 mark i wouldnt say the part that darkness mentioned, i think , perhaps i might.

but if 2marks qn , i will say that * ductile part* and doesnt have much industrial use ?

dkcx SG

might as well say it is alloyed to carbon to make steel so that it is stronger righT?

anyway, if 1 mark i wouldnt say the part that darkness mentioned, i think , perhaps i might.

but if 2marks qn , i will say that * ductile part* and doesnt have much industrial use ?

Alloy is only for between metals right? With C can be considered alloy meh? Forgot what is the definition liao since this topic is consider a relatively useless topic to all but material science/engineering students

yiha093 SG

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ViewtyKU990 SG

>dkcx

yeap, it is considered alloy.

Alloy is a mixture of metal with other metals/ NON metal

thats why we have high carbon steel and low carbon steel, which are both alloys

bonkysleuth SG

Hmmm, so there's no answer for the tys question? I called up my teacher and she said yes the question is still relevant and was told to figure out the answer myself first. i mean the iron extraction question. anyway, this question was quite new, appeared in the paper in recent years.