Furnace

Kit (Furnace)

Volume	1000 L
Recipes
Autolathe	30g Iron, 10g Copper
Fabricator	30g Iron, 10g Copper

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

Furnace

Operation
Prefab Hash	1947944864
Prefab Name	StructureFurnace
Construction
Placed with	Kit (Furnace)
Placed on	Small Grid
Stage 1
Next Stage Construction
Constructed with tool	Wrench
Constructed with item	2x Iron Sheets
Deconstruction
Deconstructed with	Crowbar
Item received	Kit (Furnace)
Stage 2
Next Stage Construction
Constructed with tool	Welding Torch
Constructed with item	2x Iron Sheets
Deconstruction
Deconstructed with	Crowbar
Item received	2x Iron Sheets
Stage 3
Deconstruction
Deconstructed with	Angle Grinder
Item received	2x Iron Sheets

Description

The Furnace is used to smelt ore into ingots and alloys using an fuel mixture. Gases can be fed in measured amounts directly into the furnace via the pipe inlet. Alternately Oxite and Volatiles can be manually fed into the input slot of the furnace in order to create crude gas mixtures. The Furnace can do everything the Arc Furnace can do, but without using electricity, and far more efficiently. The furnace can also be used to melt Ices which can then be directly extracted as an easy trick for melting 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).

The face of the furnace has a button that will ignite any flammable gas mixture inside furnace. If the furnace is cold any ice loaded into the input slot will not melt, however pressing the button will melt a single chunk of ice each time it is pressed. In addition the button indicates the status of any ingot or alloy mix inside the furnace. If the button is green the ore or alloy mix is within the temperature range required for smelting.

The contents of the furnace can be ejected by pulling the lever on the front. If the contents have not reached the required temperature and pressure for smelting, they'll come out as Reagent Mix. Reagent mix 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.

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

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

All the alloys the furnace can smelt are easily achieved with ice, and they can also be smelted using gases fed into the furnace through the pipe inputs. Regardless of which method is used the furnace gases must be purged thru a working piping setup (a valve and passive vent at bare minimum to vent the internal gasses).

Gaseous fuel can be premixed and fed into the furnace. This can be done by feeding Volatile ices and Oxite ices in an Ice Crusher in the correct ratio to produce fuel. There are a number of different gases mixtures.
The Furnace's output can also be extracted and vented/recycled through a backpressure regulator to maintain furnace pressure. Adding additional gases to the furnace can 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 wait for the button to turn green. You can verify that the mixture is ready by hovering over the furnce, if "will produce xxxxx" is shown then you can extract the alloy by pulling the lever on the front. 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 on produce a reagent mix if the ingredient ratios are not correct and you will have to eject the mixture or add additional resources to balance the recipe.

Smelting

Required conditions for smelting

The following table shows the pressure and temperature conditions required to smelt various ores and alloys.

Ingot	Input	Pressure (MPa)		Temperature (K)		Temperature (°C)
		Min	Max	Min	Max	Min	Max
1 Charcoal	1 Biomass	0.1 MPa	100 MPa	580 K	100 kK	307°C	99726°C
1 Silicon	1 Silicon	0.1 MPa	100 MPa	900 K	100 kK	627°C	99726°C
1 Iron	1 Iron	0.1 MPa	100 MPa	800 K	100 kK	527°C	99726°C
1 Gold	1 Gold	0.1 MPa	100 MPa	600 K	100 kK	327°C	99726°C
1 Copper	1 Copper	0.1 MPa	100 MPa	600 K	100 kK	327°C	99726°C
1 Silver	1 Silver	0.1 MPa	100 MPa	600 K	100 kK	327°C	99726°C
1 Lead	1 Lead	0.1 MPa	100 MPa	400 K	100 kK	127°C	99726°C
1 Nickel	1 Nickel	0.1 MPa	100 MPa	800 K	100 kK	527°C	99726°C
4 Steel	3 Iron 1 Coal	1 MPa	100 MPa	900 K	100 kK	627°C	99726°C
2 Electrum	1 Silver 1 Gold	0.8 MPa	2.4 MPa	600 K	100 kK	327°C	99726°C
2 Invar	1 Iron 1 Nickel	18 MPa	20 MPa	1.2 kK	1.5 kK	927°C	1227°C
2 Constantan	1 Copper 1 Nickel	20 MPa	100 MPa	1 kK	10 kK	727°C	9726°C
2 Solder	1 Iron 1 Lead	1 MPa	100 MPa	350 K	550 K	77°C	277°C
Update 0.2.2768.13597 - Thu 11/02/2021 /Recipes

Alloy recipes

Ice only recipes

Alloys can be made in the furnace by manually loading Ices into the input slot of the furnace and igniting the fuel mixture. While this method produces crude fuel mixtures and the amount of fuel is not as precisely controlled as gaseous fueling, all the basic alloys can be made using this method. The procedure is as follows.

• Prepare the ice and ores by splitting them into the the correct amounts and arranging them in you backpack or mining belt.

• When all the component are ready load the first set of ice chunks into the furnace.If the the ice does not melt on it's own (the input slot stays closed) press the button on the furnace's face to melt the ice.

• Load the second ice into the furnace. As soon as you press the button on the front of the furnace the fuel mixture will ignite.

• As soon as the furnace is lit quickly load the ores into the furnace. After all the ores are loaded wait for the button to turn green indicating the mixture has reached the correct temperature and pressure.

• Pull the lever to eject the finished alloy.

Ice Chunks	Ingredients	Temperature	Pressure	Alloy
2 Volatiles 1 Oxite	150 Iron Ore 50 Coal	950 K	6.82 MPa	200 Steel
13 Volatiles 7 Oxite	50 Copper Ore 50 Nickel Ore	1.72 kK	20.8 MPa	100 Constantan
9 Volatiles 24 Oxite	50 Nickel Ore 50 Iron Ore	1.43 kK	18.7 MPa	100 Invar
1 Volatiles 1 Oxite	50 Silver Ingot *** 50 Gold Ingot ***	1020 K	840 KPa	100 Electrum
1 Volatiles 2 Nitrice 4 Water Ice	50 Lead Ingot *** 50 Iron Ore	526 K	1.26 MPa	100 Solder

*** Ingots are used instead of raw ores to prevent the production of extra gases when making these recipes

Gaseous Fuel Recipes

A basic ice crushing, gas collection and measuring setup

In this setup fuel is pumped into the furnace from either pre-measured canisters or pumped into the furnace in measured amounts. Fuel and be any number of gas mixtures.

The gas should be pumped into the furnace and ignited; the ores should be placed in the furnace as soon as the gases are ignited. It is not necessary to wait for the furnace to come up to temperature. 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, until you see the "will produce" while hovering over the furnace. Then pull the handle and your alloy will be ejected.

Dirty fuel

Dirty Fuel is a 2:1 mixture of Volatile and Oxites gases. The table below shows the correct pressures of gases to load into a canister, but currently omits Hydrogen and Nitrogen quantities.

Canister Pressure @ 0°C	Gases	Ingredients	Temperature	Pressure	Alloy
Dirty Fuel     1,500 KPa	24.5 Mols Methane 13.8 Mols Oxygen	75 Iron Ore 25 Coal	907 K	4.72 MPa	100 Steel
Dirty Fuel     2,700 KPa	44.1 Mols Methane 24.8 Mols Oxygen	150 Iron Ore 50 Coal	907 K	9.28 MPa	200 Steel
Dirty Fuel      250 KPa	4.09 Mols Methane 2.3 Mols Oxygen	50 Silver Ore 50 Gold Ore	695 K	1.62 MPa	100 Electrum
Dirty Fuel       45 KPa	0.741 Mols Methane 0.417 Mols Oxygen	50 Lead Ore 50 Iron Ore	407 K	1.07 MPa	100 Solder
Dirty Fuel (2x) 7,500 KPa	245 Mols Methane 138 Mols Oxygen	50 Copper Ore 50 Nickel Ore	1.83 kK	20.5 MPa	100 Constantan
Dirty Fuel (2x) 6,000 KPa Pressurant (2x) 9,500 KPa	196 Mols Methane 110 Mols Oxygen 533 Mols Pressurant ^^^	50 Nickel Ore 50 Iron Ore	1.38 kK	19.2 MPa	100 Invar

^^^These recipes use CO2 @ 0°C as a pressurant. Other pressurants such as Nitrogen, Pollutants, and Oxygen are possible, but they may result in different outcomes.

Tips

• 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.
• 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).

Additional fuel mixes

Prime	FAR	In: Mols		Result			Out: Mols
		H2	O2	Press.	Celcius	Kelvin	O2	H2	Co2	X
100 kPa	2:1	29	14	2 135	1 953	2 216	1	3	82	33
200 kPa	2:1	59	29	4 500	2 000	2 273	1	5	169	80
200 kPa	3:1	65	21	3 400	1 900	2 173	2	26	118	52
200 kPa	4:1	72	18	3 000	1 800	2 273	1	40	99	42
200 kPa	1:1	43	43	3 493	1 917	2 190	22	2	127	59
200 kPa	1:4	17	68	1 646	1 319	1 592	63	2	50	18
300 kPa	2:1	86	42	6 850	2 109	2 382	2	7	242	115
902.7 kPa	2:1	263	108	19.25 MPa	2 054	2 357	70	7	767	151
1 MPa	2:1	291	120	21.62 MPa	2 061	2 334	74	7	862	170
1.497 MPa	2:1	408	204	35.34 MPa	2 121	2 394	10	20	1163	581

Ore Off-Gassing

Ores being smelted release gases, unless they have been previously sent through a furnace or centrifuge. However both the centrifuge and arc furnace require additional time and energy to remove gases from ores, and the gases will be lost. These gases will increase pressure and lower temperature inside the furnace, but can also be beneficial to the smelting process. For example Solder, requires very little fuel to smelt due to the N20 released from the Lead Ore during smelting. Removing the N20 from the lead ore prior to smelting will result in the need for additional fuel to make up for it's loss.

CAUTION: As Vol is far more reactive with N2O and burns at a rate of 1:1, rather than 2:1 with O2, be cautious to not add additional volatiles after smelting silver or lead ores. Doing so could lead to rapid spikes in pressure and, not managed properly, could lead to a furnace exploding.

Ore	Out: Mols
	Vol	X	N2	CO2	O2	N2O
1 Biomass	8.0	4.0	0.0	0.0	0.0	0.0
1 Coal	0.0	3.0	0.0	10.0	0.0	0.0
1 Silicon	0.0	1.0	1.0	1.0	0.0	0.0
1 Iron	0.0	2.0	0.0	0.5	0.0	0.0
1 Gold	0.0	2.0	0.5	0.2	0.2	0.0
1 Copper	0.0	1.0	0.5	1.0	0.0	0.0
1 Silver	0.0	1.0	0.4	0.0	0.0	1.0
1 Lead	0.0	2.0	1.0	0.4	0.0	0.4
1 Nickel	0.0	1.0	0.5	1.0	0.0	0.0
1 Cobalt	1.0	0.0	3.0	0.0	0.0	0.0

Data Network Properties

These are all Data Network properties of this device.

Data Parameters

These are all parameters that can be written with a Logic Writer, Batch Writer, or Integrated Circuit (IC10).

Parameter Name	Data Type	Description
Activate	Boolean	Activates the Furnace, when set to 1.
ClearMemory	Boolean	When set to 1,clears the counter memory(e.g.ExportCount). Will set itself back to 0 when actioned.
Lock	Boolean	Locks the Furnace, when set to 1. Unlocks it when set to 0.
Mode	Integer	Returns whether the Furnace is smelting. (0 for no, 1 for yes).
Open	Boolean	Opens the Furnace, when set to 1. Closes it, when set to 0.
Setting	Float	(Unknown) Affects the Setting output.

Data Outputs

These are all parameters, that can be read with a Logic Reader or a Slot Reader. The outputs are listed in the order a Logic Reader's "VAR" setting cycles through them.

Output Name	Data Type	Description
Activate	Boolean	Returns if the furnace is active.
Combustion	Boolean	Returns 1 if the furnace atmosphere is on fire.
ExportCount	Integer	How many items exported since last ClearMemory.
ImportCount	Integer	How many items imported since last ClearMemory.
Lock	Boolean	Returns whether the Furnace is locked.
Maximum	Integer	(Unknown) Returns 100.
Mode	Integer	Returns whether the Furnace is smelting. (0 for no, 1 for yes).
Open	Boolean	Returns whether the Furnace is open. (0 for no, 1 for yes).
PrefabHash	Integer	The hash of the structure.
Pressure	Float	Returns the pressure in the Furnace in kilo pascal.
Ratio	Float	(Unknown) Returns 0.5.
RatioCarbonDioxide	Float	Returns a range from 0.0 to 1.0. Returns the percentage ratio of the amount of carbon dioxide in the Furnace.
RatioNitrogen	Float	Returns a range from 0.0 to 1.0. Returns the percentage ratio of the amount of nitrogen in the Furnace.
RatioNitrousOxide	Float	Returns a range from 0.0 to 1.0. Returns the percentage ratio of the amount of nitrous oxide in the Furnace.
RatioOxygen	Float	Returns a range from 0.0 to 1.0. Returns the percentage ratio of the amount of oxygen in the Furnace.
RatioPollutant	Float	Returns a range from 0.0 to 1.0. Returns the percentage ratio of the amount of pollutant in the Furnace.
RatioVolatiles	Float	Returns a range from 0.0 to 1.0. Returns the percentage ratio of the amount of volatiles in the Furnace.
RatioWater	Float	Returns a range from 0.0 to 1.0. Returns the percentage ratio of the amount of water in the Furnace.
Reagents	Float	Returns the amount of reagents (smeltable ores, not counting ice) in the Furnace, in grams.
RecipeHash	int	Current hash of the recipe the device is set to produce.
Setting	Float	(Unknown) Affected by the Setting parameter.
Temperature	Float	Returns the temperature in the Furnace in kelvin.
TotalMoles	Float	Returns the total moles of the furnace.