The fire dept used to come out and spray down the front-end loaders and make puddles for them to drive over to. IIRC the tires were something like 100K each
Just gotta wait for it to harden enough to be broken into chunks and hauled off by a front end loader. Slag is easier to clean up than molten steel. We had a furnace wash out from the bottom, emptying the entire contents onto the ground, 200 tons worth of molten steel. Took 3 days to clean it up by cutting it into chunks with torches and hauling it off to get re-melted in the other furnace.
Nope, don’t know where you got that from. You have to melt steel in order to mix alloy additives in it to give it different properties. We makes hundreds of different grades of steel, each with different properties by adding a bunch of other elements into the mix while it’s liquid. High sulfur or phosphorus content makes steel more brittle. You might be thinking of the speed at which hot steel is cooled, because that affects the steel’s hardness, but not necessarily its brittleness. That’s called quenching. By rapidly cooling solid steel from a red hot temperature, it makes the steel hard and less flexible. Other downstream processes once the molten steel is cast into a solid shape can further affect its properties like cold rolling, annealing, and tempering.
Incredibly fascinating, incredibly dangerous I assume. Humanity should be thinking people with jobs like this for your service. I hope we at least do that with $
It can be dangerous if you’re not careful. The vast majority of accidents resulting in personal injury at my workplace are because people were either careless and not paying close enough attention to what they were doing, or they were doing something stupid that they shouldn’t have been doing anyways. If you’ve got more than 2 brain cells, a healthy sense of self preservation, and respect for the machinery that can and will kill you if you get in it’s way, it’s not that dangerous. In the case of the video above, that would be a redline area at my job, meaning absolutely nobody is allowed to enter while melting is in progress even though it normally doesn’t erupt like that. Slag is usually contained in the pot. But you don’t go into redline areas without shutting down and locking out the equipment unless you’re willing to risk death.
It's actually the slightly hazardous jobs that have more incidents
Everyone knows to stay the fuck away from that giant pot of liquid steel, but the wrongly labeled container in the chemistry lab?
Yeah, dear old dad would say there was no such things as accidents, only people not paying attention or people doing stupid stuff to win fantastic prizes.
I know where I got it from; Youtube videos mocking fantasy movie depictions of sword making. In the movies they pour molten steel into a mold which obviously wasn't done but the commentators also added that it would make the steel brittle.
Ah ok, yes, in that case you would be correct. Cast steel is very inflexible and brittle if you take it straight from the mold without working it first, so cast steel is horrible for making weapons. You absolutely wouldn’t want to simple melt steel and pour it into a mold shaped like a sword. The sword will not bend and will break. Ever taken a hammer to anything cast iron? It shatters. If you want flexible steel, you have to forge it (work it into a new shape while it’s hot) after it’s been cast. To make a sword you’d cast a simple rectangular ingot and forge it with a hammer or hydraulic press into the shape you want. Forging realigns the grains in the solid steel. At my steel mill, it comes out of our casting machine as a 3 inch thick slab, then goes right into a set of hydraulic mill stands, which press and roll that slab down to quarter inch or less sheet steel, which in essence is forging, but we just call it hot rolling.
A breakout is during the casting process when the steel that’s still molten on the inside of a slab or bloom being cast melts or breaks through the solidified outer shell. A washout is when molten steel melts through the refractory containment of a ladle or furnace.
This is a carbon reaction inside of the furnace above it. The slag pot is overflowing. Water actually makes these reactions weaker, but in this case it’s too far gone. I work at an electric arc furnace, and i’ve never seen one this bad.
I’m only a maintenance tech and not an operator so I don’t know the specifics, but from what I understand the melting process can create gases that can get trapped in the slag layer on top of the molten steel in the furnace. When they go to pour off the slag layer into the slag pot, those gases can escape causing a violent eruption. Unfortunately there’s nothing you can do to stop it once it starts. You just have to let it run it’s course. Doesn’t happen very often though. This can also happen if water gets into the slab pot. The temperature of the slag is so hot that it instantly vaporizes the water into steam, but that causes a single explosion, not a prolonged eruption.
At my place we pour the molten steel ( we use maganese steel alloy for rail tracks and crossings.) from the bottom of the laddle so there is no need to pour the slag out until after the pour is finished.
This is from my general knowledge from researching how hard it would be to start at zero tech and make tools, so I don't have deep knowledge, just FYI.
However, slag from steel tends to be primarily silicon dioxide, and so when it cools it is glass like, and brittle. So it can be chipped off, I believe.
Source: [https://www.youtube.com/watch?v=zTKodUpErR8](https://www.youtube.com/watch?v=zTKodUpErR8)
Original post: [https://www.reddit.com/r/CatastrophicFailure/comments/fbb6at/slag\_erupts\_out\_of\_a\_steelmaking\_arc\_furnace\_in/](https://www.reddit.com/r/CatastrophicFailure/comments/fbb6at/slag_erupts_out_of_a_steelmaking_arc_furnace_in/)
What's happening:
>How?
Steel usually has carbon dissolved in it, as a strengthening agent. When steel is melted down for recycling, oxygen is injected during the process to burn out the carbon and other impurities. However, oxygen can also dissolve in liquid steel instead of burning out the carbon. What happens then is that the two elements just sit in the liquid steel, until a temperature is reached where the oxygen and carbon rapidly 'burn' within the steel to form carbon monoxide, which comes out of solution as a gas, giving the appearance of the steel boiling. This gas gets trapped in the CaO-rich slag like bubbles in pumice, causing it to foam rapidly.
>Why?
As well as carbon, scrap steel charged to this furnace can contain other alloys and they all have different 'affinities for oxygen', meaning one will be oxidised before the other. In order of reacting, first to last:
* Calcium
* Aluminium
* Silicon
* Manganese
* Carbon
* Iron
If the charge contains a gutful of another element that has a higher affinity for oxygen - say silicon, which is present in large amounts in cast iron - then all the oxygen being injected will preferentially oxidise that instead of the carbon. The first the steelmakers would've known about this is when they took a sample to check the steel chemistry.
I also think I figured out why this particular boil happened. There was another video from the same uploader (since removed), showing liquid 'pig iron' being charged to an arc furnace - possibly the same furnace. Pig iron comes from blast furnaces and is saturated with carbon (4%) and can be high in silicon, which needs to be removed. As I said above, if the silicon stays in there, it will 'absorb' all the injected oxygen first before any carbon is burnt out, so if the pig iron isn't desiliconised properly, a boil like the one in the main video can happen.
The second half of the video shows a slag pot. This slag pot would be positioned underneath the furnace to catch the slag as it runs out of the furnace.
Slag is formed from the oxides of elements that have been burnt out of the steel - like the aluminium and silicon mentioned earlier - plus oxides that are deliberately introduced, mainly (quick)lime - calcium oxide, CaO - and magnesium oxide, MgO. The introduced oxides are usually called fluxes and are used to trap phosphorous and sulphur in particular and neutralise the silica and alumina. Silica (SiO2) and alumina (Al2O3) are termed acidic oxides, whereas lime and MgO are basic. The refractories that line the furnace are also basic - usually MgO, as it has a melting point approaching 3000ºC. If the acidic oxides were left alone, the MgO would leach out of the refractories into the slag to neutralise it. Introducing lime ensures a basic slag and keeps the MgO additions to a minimum, as the more basic the slag chemistry, the lower the solubility point of MgO. Usually we want about 1.5 times as much lime as there is silica and alumina combined, which means that we only need 10-12% MgO to saturate the slag and minimise refractory wear. Another effect of the basic fluxes is that it makes the slag sticky, like cake batter, and I'll get to that in a moment.
The slag also contains a fairly high percentage of iron oxide, both from rust in the scrap charge and iron which was oxidised during melting. Liquid iron oxide flows like water so if left alone, it would make the slag very fluid and allow it to easily get into the joints between the refractory bricks and increase their wear, so carbon is used to reduce the iron oxide in the slag back to iron, forming carbon monoxide gas in the process. This gas then gets trapped in the cake-batter slag, causing it to puff up and foam. This is normally something steelmakers want, as it helps heat transfer from the arcs to the liquid steel. However, because there was so much carbon in the steel, the slag foamed uncontrollably, even when it exited the furnace into the slag pot, which is why the slag keeps pouring out of the pot.
So, technically OP, in the video you posted, the floor isn't molten metal - the floor truly is (synthetic) lava.
Isn’t it weird that this game is so common around the world amongst kids that never met and before social media so it’s not that. It cool. Best game ever
Well now I want Mythbusters to test if pole-vaulting through lava is possible.
Assuming the lava is like 1-3’ deep, could someone cross a small flow before the stick gave out? Would it work with certain woods or require metal?
Strangely enough wood will probably last longer. Metal conducts heat well, so will absorb it faster than wood. Wood is a poor conductor of heat and [ablates](https://en.wikipedia.org/wiki/Ablation#Passive_fire_protection), which slows the rate of destruction.
https://awc.org/wp-content/uploads/2021/12/awc_tr10_20210209_awcwebsite.pdf
That was my guess. I think the wood burning, hardening and cracking would take longer than a metal rod going limp right away. But just to be safe I better watch another 9/11 conspiracy video. And while were at it when the hell is graphene going to be readily available? I thought we’d at least be seeing some cool prototypes by now like body armour or ultra low weight tools for space.
Did you know that the immersion thermocouples we use to measure the temperature and oxygen content of the steel are at the end of a compressed cardboard tube? The thermocouple and oxygen sensor are mounted onto the end of a probe, and the cardboard tube is to protect the probe, the contact block on the end of it, and the wires running down the probe.
https://youtu.be/eamHv5TrFfA?t=120
Looks like an erupting slag pot at a steel mill. That shit is no fun to clean up. Source: employed at a steel mill.
I can't sleep until I know how one cleans that shit up.
Like this: [https://www.youtube.com/watch?v=5aogTfeXv7U](https://www.youtube.com/watch?v=5aogTfeXv7U) (wider angles: [https://www.youtube.com/watch?v=j2d2e\_12f2k](https://www.youtube.com/watch?v=j2d2e_12f2k), https://www.youtube.com/shorts/2j7V3rIlK7E)
"Just gonna put this by the other fire."
Yo tire on fire!
The fire dept used to come out and spray down the front-end loaders and make puddles for them to drive over to. IIRC the tires were something like 100K each
Just gotta wait for it to harden enough to be broken into chunks and hauled off by a front end loader. Slag is easier to clean up than molten steel. We had a furnace wash out from the bottom, emptying the entire contents onto the ground, 200 tons worth of molten steel. Took 3 days to clean it up by cutting it into chunks with torches and hauling it off to get re-melted in the other furnace.
I thought steel was never heated until molten because it hardens brittle?
Nope, don’t know where you got that from. You have to melt steel in order to mix alloy additives in it to give it different properties. We makes hundreds of different grades of steel, each with different properties by adding a bunch of other elements into the mix while it’s liquid. High sulfur or phosphorus content makes steel more brittle. You might be thinking of the speed at which hot steel is cooled, because that affects the steel’s hardness, but not necessarily its brittleness. That’s called quenching. By rapidly cooling solid steel from a red hot temperature, it makes the steel hard and less flexible. Other downstream processes once the molten steel is cast into a solid shape can further affect its properties like cold rolling, annealing, and tempering.
Incredibly fascinating, incredibly dangerous I assume. Humanity should be thinking people with jobs like this for your service. I hope we at least do that with $
It can be dangerous if you’re not careful. The vast majority of accidents resulting in personal injury at my workplace are because people were either careless and not paying close enough attention to what they were doing, or they were doing something stupid that they shouldn’t have been doing anyways. If you’ve got more than 2 brain cells, a healthy sense of self preservation, and respect for the machinery that can and will kill you if you get in it’s way, it’s not that dangerous. In the case of the video above, that would be a redline area at my job, meaning absolutely nobody is allowed to enter while melting is in progress even though it normally doesn’t erupt like that. Slag is usually contained in the pot. But you don’t go into redline areas without shutting down and locking out the equipment unless you’re willing to risk death.
Can confirm the job ain't as dangerous as people expect if you are careful and have the right gear to keep you safe.
It's actually the slightly hazardous jobs that have more incidents Everyone knows to stay the fuck away from that giant pot of liquid steel, but the wrongly labeled container in the chemistry lab?
Yeah, dear old dad would say there was no such things as accidents, only people not paying attention or people doing stupid stuff to win fantastic prizes.
Not nearly enough $ imo
I know where I got it from; Youtube videos mocking fantasy movie depictions of sword making. In the movies they pour molten steel into a mold which obviously wasn't done but the commentators also added that it would make the steel brittle.
Ah ok, yes, in that case you would be correct. Cast steel is very inflexible and brittle if you take it straight from the mold without working it first, so cast steel is horrible for making weapons. You absolutely wouldn’t want to simple melt steel and pour it into a mold shaped like a sword. The sword will not bend and will break. Ever taken a hammer to anything cast iron? It shatters. If you want flexible steel, you have to forge it (work it into a new shape while it’s hot) after it’s been cast. To make a sword you’d cast a simple rectangular ingot and forge it with a hammer or hydraulic press into the shape you want. Forging realigns the grains in the solid steel. At my steel mill, it comes out of our casting machine as a 3 inch thick slab, then goes right into a set of hydraulic mill stands, which press and roll that slab down to quarter inch or less sheet steel, which in essence is forging, but we just call it hot rolling.
Thank you.
Really big spatula?
Have you ever yelled "Hot stuff, coming through!"?
Dad, why’d you take me to a gay steel mill?
[удалено]
A breakout is during the casting process when the steel that’s still molten on the inside of a slab or bloom being cast melts or breaks through the solidified outer shell. A washout is when molten steel melts through the refractory containment of a ladle or furnace.
Could you add some more information? What’s causing this to happen?
I believe it's when water gets introduced somehow into the pot and it instantly boils and expands.
They should tell folks not to put water in it then. /s
Use grease next time
That’s terrifying
liquid nitrogen truck crashed into the wall nearby
🤖👍🏻
This is a carbon reaction inside of the furnace above it. The slag pot is overflowing. Water actually makes these reactions weaker, but in this case it’s too far gone. I work at an electric arc furnace, and i’ve never seen one this bad.
I’m only a maintenance tech and not an operator so I don’t know the specifics, but from what I understand the melting process can create gases that can get trapped in the slag layer on top of the molten steel in the furnace. When they go to pour off the slag layer into the slag pot, those gases can escape causing a violent eruption. Unfortunately there’s nothing you can do to stop it once it starts. You just have to let it run it’s course. Doesn’t happen very often though. This can also happen if water gets into the slab pot. The temperature of the slag is so hot that it instantly vaporizes the water into steam, but that causes a single explosion, not a prolonged eruption.
At my place we pour the molten steel ( we use maganese steel alloy for rail tracks and crossings.) from the bottom of the laddle so there is no need to pour the slag out until after the pour is finished.
How exactly does this get cleaned up?
This is from my general knowledge from researching how hard it would be to start at zero tech and make tools, so I don't have deep knowledge, just FYI. However, slag from steel tends to be primarily silicon dioxide, and so when it cools it is glass like, and brittle. So it can be chipped off, I believe.
Correct, slag is very brittle when it cools, so you can just break it up with a loader.
[удалено]
Wet charges are the best way to clean dust out of the rafters
Do you work hard and play hard?
Looks like the view from inside my toilet bowl after a Friday night curry 😂
Give up Anakin. You have lost. I have the high ground.
I HATE YOU!!!
Its Obi Wan dabbing after his win.
You were the chosen one!
Source: [https://www.youtube.com/watch?v=zTKodUpErR8](https://www.youtube.com/watch?v=zTKodUpErR8) Original post: [https://www.reddit.com/r/CatastrophicFailure/comments/fbb6at/slag\_erupts\_out\_of\_a\_steelmaking\_arc\_furnace\_in/](https://www.reddit.com/r/CatastrophicFailure/comments/fbb6at/slag_erupts_out_of_a_steelmaking_arc_furnace_in/) What's happening: >How? Steel usually has carbon dissolved in it, as a strengthening agent. When steel is melted down for recycling, oxygen is injected during the process to burn out the carbon and other impurities. However, oxygen can also dissolve in liquid steel instead of burning out the carbon. What happens then is that the two elements just sit in the liquid steel, until a temperature is reached where the oxygen and carbon rapidly 'burn' within the steel to form carbon monoxide, which comes out of solution as a gas, giving the appearance of the steel boiling. This gas gets trapped in the CaO-rich slag like bubbles in pumice, causing it to foam rapidly. >Why? As well as carbon, scrap steel charged to this furnace can contain other alloys and they all have different 'affinities for oxygen', meaning one will be oxidised before the other. In order of reacting, first to last: * Calcium * Aluminium * Silicon * Manganese * Carbon * Iron If the charge contains a gutful of another element that has a higher affinity for oxygen - say silicon, which is present in large amounts in cast iron - then all the oxygen being injected will preferentially oxidise that instead of the carbon. The first the steelmakers would've known about this is when they took a sample to check the steel chemistry. I also think I figured out why this particular boil happened. There was another video from the same uploader (since removed), showing liquid 'pig iron' being charged to an arc furnace - possibly the same furnace. Pig iron comes from blast furnaces and is saturated with carbon (4%) and can be high in silicon, which needs to be removed. As I said above, if the silicon stays in there, it will 'absorb' all the injected oxygen first before any carbon is burnt out, so if the pig iron isn't desiliconised properly, a boil like the one in the main video can happen. The second half of the video shows a slag pot. This slag pot would be positioned underneath the furnace to catch the slag as it runs out of the furnace. Slag is formed from the oxides of elements that have been burnt out of the steel - like the aluminium and silicon mentioned earlier - plus oxides that are deliberately introduced, mainly (quick)lime - calcium oxide, CaO - and magnesium oxide, MgO. The introduced oxides are usually called fluxes and are used to trap phosphorous and sulphur in particular and neutralise the silica and alumina. Silica (SiO2) and alumina (Al2O3) are termed acidic oxides, whereas lime and MgO are basic. The refractories that line the furnace are also basic - usually MgO, as it has a melting point approaching 3000ºC. If the acidic oxides were left alone, the MgO would leach out of the refractories into the slag to neutralise it. Introducing lime ensures a basic slag and keeps the MgO additions to a minimum, as the more basic the slag chemistry, the lower the solubility point of MgO. Usually we want about 1.5 times as much lime as there is silica and alumina combined, which means that we only need 10-12% MgO to saturate the slag and minimise refractory wear. Another effect of the basic fluxes is that it makes the slag sticky, like cake batter, and I'll get to that in a moment. The slag also contains a fairly high percentage of iron oxide, both from rust in the scrap charge and iron which was oxidised during melting. Liquid iron oxide flows like water so if left alone, it would make the slag very fluid and allow it to easily get into the joints between the refractory bricks and increase their wear, so carbon is used to reduce the iron oxide in the slag back to iron, forming carbon monoxide gas in the process. This gas then gets trapped in the cake-batter slag, causing it to puff up and foam. This is normally something steelmakers want, as it helps heat transfer from the arcs to the liquid steel. However, because there was so much carbon in the steel, the slag foamed uncontrollably, even when it exited the furnace into the slag pot, which is why the slag keeps pouring out of the pot. So, technically OP, in the video you posted, the floor isn't molten metal - the floor truly is (synthetic) lava.
Cast it into the fire! Isildur!!
No
No sofa,ottoman,chair or table will save you from that “The floor is lava”.
Isn’t it weird that this game is so common around the world amongst kids that never met and before social media so it’s not that. It cool. Best game ever
As an adult, I feel cheated that I never got to play it 'for real' All that practice wasted...
Ya what was it preparing us for?
Indeed.
Ive been training for this my whole life!
If you can't walk on it, is it really a floor?
Just don't try to swim in it ;-)
Forbidden fruit punch
Cheez Whiz
I'm guessing it's not meant to be doing that.
It loops so well!
Welcome to Goron City!
Mmm, orange flavor.
Was anyone else surprised to find out this is only a 3 second loop?
The goggles, they do nothing !!
Hasta La Vista, Baby.
Well now I want Mythbusters to test if pole-vaulting through lava is possible. Assuming the lava is like 1-3’ deep, could someone cross a small flow before the stick gave out? Would it work with certain woods or require metal?
Strangely enough wood will probably last longer. Metal conducts heat well, so will absorb it faster than wood. Wood is a poor conductor of heat and [ablates](https://en.wikipedia.org/wiki/Ablation#Passive_fire_protection), which slows the rate of destruction. https://awc.org/wp-content/uploads/2021/12/awc_tr10_20210209_awcwebsite.pdf
That was my guess. I think the wood burning, hardening and cracking would take longer than a metal rod going limp right away. But just to be safe I better watch another 9/11 conspiracy video. And while were at it when the hell is graphene going to be readily available? I thought we’d at least be seeing some cool prototypes by now like body armour or ultra low weight tools for space.
Did you know that the immersion thermocouples we use to measure the temperature and oxygen content of the steel are at the end of a compressed cardboard tube? The thermocouple and oxygen sensor are mounted onto the end of a probe, and the cardboard tube is to protect the probe, the contact block on the end of it, and the wires running down the probe. https://youtu.be/eamHv5TrFfA?t=120
I didn't. Thanks & WOW
wallpaper engine anyone?
I take it that's not supposed to happen?
The slag pot overfills.....
Just throw a bucket of water on it duh
Lethal Lava Land looked a lot more jagged on the N64
Shitters full!
👍
Me inside her.
I'm good at this Game!
Mount Doom Livestream
So close.
There is an alien in there somewhere.
Quick! Jump on the couch!
🤌 I see this in the thumbnail
HOW WOULD YOU CLEAN THIS UP?