Furnace

Kit (Furnace)

''This article is about the basic furnace. For the advanced version, see Advanced Furnace.

Furnace

Construction Steps

Step	Tool	Item
1	Wrench	2x Iron Sheets
2	Welding Torch	2x Iron Sheets

Deconstruction Steps

Step	Tool	Recovered Item
1	Crowbar	Kit (Furnace)
2	[[Special /Crowbar	2x Iron Sheets
3	Angle Grinder	2x [## Description
The Furnace is used to smelt [[Ore	ore](/wiki/iron-sheets) into ingots and alloys using an oxygen/volatile gas mix. Ice (Oxite) and Ice (Volatiles) can be manually input directly in the furnace in order to create crude gas mixtures, or to be directly extracted as an easy trick for melting the ice.

It features a gas pipe input port (connected to its internal storage through an internal always-open one-way valve), a gas pipe output port (which lacks a one-way valve and acts as a bidirectional gas port), and a liquid output port (which acts as an always-open condensation valve).

If the contents of the furnace are ejected without reaching the required temperature and pressure for smelting, they'll come out as Reagent Mix which can be processed in a Centrifuge to recover the raw ores. Reagent Mix can also be re-smelted if the ingredients and ratios are a valid alloy recipe. This allows an intermission when the resources for reaching the required temperature / pressure are not on hand / need to be gathered first. Effectively, this means that the used metals can be 'reserved' for the intended alloy.

The Furnace can be used to smelt basic ores and simpler alloys, but an Advanced Furnace will be required for the more complex alloys.

An Arc Furnace (included in the starting gear) is required to make the metals for manufacturing a Furnace. By comparison, the Furnace can do everything the Arc Furnace can do, but without using electricity.

Danger: The furnace is not insulated, so it interacts with the surrounding atmosphere and can heat rooms to dangerous levels within minutes.

Recipes

While smelting most alloys is easily achieved with ice, some other recipes usually require a working piping setup (a valve and passive vent at bare minimum to vent the internal gasses). This can be done by separating gases into tanks using atmospheric units and piping individual gases through a mixer and a Pressure Regulator or a Pipe Volume Pump connected to the furnace input. Another method would be to mix Volatile ices and Oxite ices in an Ice Crusher to produce fuel. The Furnace's output can also be extracted and vented/recycled through a backpressure regulator to keep furnace pressure in check. The optimal gas mix that burns completely is 1 part (33.3%) oxygen to 2 parts (66.6%) volatiles, other mixes would also work but leave you with leftover oxygen or volatiles depending on the percentages used. It could also result in lower temperature if that is desired, but you could also use a volume pump with a lower fuel input setting.

Make sure to put the fuel in first, then press the activate button. Afterwards put in the ingredients and press the handle after you see the "will produce" while hovering over the furnace. Also, You MUST put in exact amounts matching the recipe amounts. For instance, you must put in 12 iron and 4 coal to make 16 steel. You cannot put in 12 iron and 7 coal. The furnace will not manufacture anything if the ingredient ratios are not correct and you will have to eject it all or add resources to balance the recipe.

See Furnace/Recipes for details.

Tips

• Placing 15 ice(volatiles) and 15 ice(oxite) will bring pressure to around 22000kpa and temp 2000k. For Invar, you will have to wait for the temperature to drop before you can process. You can use this time while the pressure is still over 20000kpa to make constantan.

• All other alloys can be achieved with a ratio of 2 volatiles to 1 oxite

• If atmosphere inside and/or around furnace is too cold to melt ice one can press 'activate' button to manually melt one ice per ignition attempt. You will need to press the ignition button for each piece of ice from the first stack that you put in. Until all solid matter was melted the import slot will remain blocked.

• Reagent Mix can be re-melted to continue balancing the recipe should you need to gather more resources or find yourself unable to balance the temperature/pressure manually.

• On Vulcan the daytime temperatures allow smelting of many basic alloys right from the start by using an active vent, even high enough for Steel. This will save the very valuable, and limited oxygen of the player, especially on brutal start conditions.

Ore Off-Gassing

Ores being smelted release gases, unless they have been previously sent through a furnace or centrifuge. These gases will increase pressure and lower temperature inside the furnace, but can be utilized as either a source of that gas (by recapturing the output of the furnace) or as an alternative source of fuels. E.g. Placing 50 silver ore into an ignited furnace will produce 50 Mol of N2O inside the furnace, which can be further burned in the presence of volatiles resulting in a higher temperature after smelting. This will push the furnace temperature beyond what may be otherwise obtainable (early game daytime Vulcan, for example). CAUTION: As Vol is far more reactive with N2O and burns at a rate of 1

, rather than 2

with O2, be cautious to not smelt too much silver or lead ores at once. Doing so could lead to rapid spikes in pressure and, not managed properly, could lead to a furnace exploding.

Ore	Out: Mols
Vol	X
1 Biomass	8.0
1 Coal	0.0
1 Silicon	0.0
1 Iron	0.0
1 Gold	0.0
1 Copper	0.0
1 Silver	0.0
1 Lead	0.0
1 Nickel	0.0
1 Cobalt	1.0

Some example fuel mixes

Prime	FAR	In: Mols	Result	Out: Mols
H2	O2	Press.	Celcius	Kelvin
100 kPa	2	29	14	2 135
200 kPa	2	59	29	4 500
200 kPa	3	65	21	3 400
200 kPa	4	72	18	3 000
200 kPa	1	43	43	3 493
200 kPa	1	17	68	1 646
300 kPa	2	86	42	6 850
902.7 kPa	2	263	108	19.25 MPa
1 MPa	2	291	120	21.62 MPa
1.497 MPa	2	408	204	35.34 MPa

Some example alloy recipes

Ice only recipes

The ices should be loaded into the Furnace and ignited, and then the ores should be loaded immediately after. No wait time is necessary. Make sure to put the fuel in first, then press the activate button. Afterwards put in the ingredients and wait for the button to turn green again, or until you see the "will produce" while hovering over the furnace. Then pull the handle and your alloy will be ejected.

Ice Chunks	Ingredients	Temperature	Pressure	Alloy
2**Volatiles**
1**Oxite**	75 Iron Ore
25 Coal	1.05 kK	6.2 MPa	100**Steel**
12**Volatiles**
6**Oxite**	50 Copper Ore
50 Nickel Ore	1.81 kK	21 MPa	100**Constantan**
8**Volatiles**
24**Oxite**	50 Nickel Ore
50 Iron Ore	1.5 kK	19 MPa	100**Invar**
3**Volatiles**
30**Nitrice**	150 Nickel Ore
150 Iron Ore	1.32 kK	18.6 MPa	300**Invar**
1**Volatiles**
1**Oxite**	50**Silver Ingot *****
50**Gold Ingot *****	997 K	1.1 MPa	100**Electrum**
1**Volatiles**
2**Nitrice**
3**Water Ice**	50**Lead Ingot *****
50 Iron Ore	528 K	1.16 MPa	100**Solder**