Difference between revisions of "In-situ resource utilization"

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File:MH ISRU.jpg|thumb|757x757px|In Situ resources Utilisation. R. Heidmann
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File:MH ISRU.jpg|thumb|757x757px|In Situ resources Utilisation. Copyright R. Heidmann
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rect 60 50 110 100 [[settlement]]
 
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rect 60 300 110 360 [[Nitrates]]
 
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rect 170 290 250 360 [[Atmospheric processing]]
 
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rect 60 520 110 570 [[water]]
 
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rect 200 530 260 580 [[Electrolysis]]
 
  
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rect 60 170 250 260 [[Dust collector]]
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rect 400 70 500 140 [[Compression]]
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rect 500 70 600 140 [[Carbon monoxide]]
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rect 400 170 500 240 [[Compression]]
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rect 500 170 600 240 [[Carbon dioxide]]
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rect 60 290 110 360 [[Nitrates]]
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rect 160 290 250 360 [[Atmospheric processing]]
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rect 500 290 600 360 [[Nitrogen]]
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rect 500 410 600 470 [[Oxygen]]
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rect 600 410 700 470 [[Sabatier process]]
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rect 720 410 820 470 [[Methane]]
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rect 60 520 130 590 [[water]]
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rect 160 520 250 590 [[Electrolysis]]
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rect 500 520 600 590 [[Hydrogen]]
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rect 60 850 120 950 [[Mining]]
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rect 60 1100 120 1200 [[Mining]]
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rect 720 630 820 710 [[Fertilizer]]
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rect 720 1200 820 1280 [[Glass]]
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rect 60 1300 120 1380 [[Iron ore]]
  
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The use of local resources is called '''in-situ resource utilization''' or ISRU. This concept is critical to the survival of an [[Foundation of an Autonomous Colony|autonomous]] or [[Semi-autonomous colony|semi-autonomous]] [[settlement]].
+
</imagemap>
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==Ressources==
+
 
 +
The use of local resources is called '''in-situ resource utilization''' or ISRU. This concept is critical to the survival of an [[Foundation of an Autonomous Colony|autonomous]] or [[Semi-autonomous colony|semi-autonomous]] [[settlement]].  The [[ISRU timeline]] is very rapid for most settlement plans since the initial Zubrin proposal of MArs Direct.
 +
 
 +
Resources(inputs) are processed to create products(outputs).  These outputs can become inputs to other processes used to create new, more complex outputs.  Eventually, the outputs can be re-used by recycling, reducing the needs for new resources.  However, losses are always present is systems, making the acquisition of new resources a continuous requirement.  The presence of numerous resources on Mars is part of what makes it an interesting target for colonization and settlement.
 +
 
 +
Production processes require energy to operate and must be housed in [[Production|production facilities]].
 +
==Resources (Inputs)==
  
 
===Atmosphere===
 
===Atmosphere===
Line 18: Line 37:
 
Many of the [[:category:elements|elements]] and molecules in the [[atmosphere]] can be utilized. Condensation, followed by distillation, are often used to extract resources. The atmosphere is first cooled to a liquid or solid state. This is distilled at precise temperatures in order to separate the elements and molecules.
 
Many of the [[:category:elements|elements]] and molecules in the [[atmosphere]] can be utilized. Condensation, followed by distillation, are often used to extract resources. The atmosphere is first cooled to a liquid or solid state. This is distilled at precise temperatures in order to separate the elements and molecules.
  
−
====Carbon dioxide (CO2)====
+
*[[Carbon dioxide]] (CO2) composes 96% of the martian atmosphere. Carbon dioxide is the main source of carbon, used for fuel production (CH4) and an essential element for life.  Carbon dioxide also serves as a source of oxygen for the settlement atmosphere and as the oxidizer in bi-propellant fuels.
−
[[Carbon dioxide]] composes 96% of the martian atmosphere
 
−
 
 
−
Carbon dioxide is the main source of carbon, used for fuel production (CH4) and an essential element for life.
 
  
−
====Nitrogen (N2)====
+
*[[Nitrogen]] composes 2% of martian atmosphere.  Nitrogen is used by plants and is part of a breathable atmosphere.  Its concentration on Earth is 78% of the atmosphere.
−
[[Nitrogen]] composes 2% of martian atmosphere.
 
  
−
Nitrogen is used by plants and is part of a breathable atmosphere. Its concentration on Earth is 78% of the atmosphere.
+
*[[Argon]] is an inert gas, useful in some industrial processes as an inert atmosphere and may be used as propellant in Electric Propulsion of spaceships.2% of martian atmosphere
  
−
====Argon (Ar)====
+
*[[Water]] (H2O) is the main source of hydrogen and oxygen.  Oxygen is required for the settlement atmosphere and hydrogen is used for fuel production (CH4) and for the synthesis of hydrocarbons, the building blocks for life.
−
2% of martian atmosphere
 
−
 
 
−
[[Argon]] is an inert gas, useful in some industrial processes as an inert atmosphere and may be used as propellant in Electric Propulsion of spaceships.
 
−
 
 
−
====Water (H2O)====
 
−
[[Water]] is the main source of hydrogen, used for fuel production (CH4) and for the synthesis of hydrocarbons, the building blocks for life.
 
  
 
===Lithosphere (surface)===
 
===Lithosphere (surface)===
 
''Main article: [[Mining]]''
 
''Main article: [[Mining]]''
  
−
Minerals in the crust of Mars must be mined and processed to be useful.  The upper layer of Mars surface is called the Regolith.  It is a mixtures of materials of various interest.
+
Minerals in the crust of Mars must be mined and processed to be useful.  The upper layer of Mars surface is called the [[Regolith]].  It is a mixtures of materials of various interest.
  
−
====Water====
+
*[[Water]] can be gathered in a variety of ways. It is available  in the form of [[water ice]] or as hydrated minerals.
−
[[Water]] can be gathered in a variety of ways. It is available  in the form of [[water ice]] or as hydrated minerals.  
+
*[[Silicon|Silicates]] (SiO2) are useful for the production of glass and building materials.  It is one of the main components of the martian planetary crust.
−
 
+
*[[Iron ore]] ( Hematite:Fe2O3) or (Magnetite: Fe3O4) is a source of iron and steel, as well as oxygen or CO2, depending on the process used.
−
====Silicates====
+
*[[Alumina]] (Al2O3) is the source of aluminium.  Processing also produces CO2, oxygen or water, depending on the process used.
−
[[Silicon|Silicates]] (SiO2) are useful for the production of glass and building materials.  It is one of the main components of the martian planetary crust.
+
*[[Car|Calcium carbonate]] (CaCO3) is used for concrete production.  Carbonates are also a potential source of carbon for carbohydrates. [[Sodium carbonates]] are used in glass production. Carbonates are available on Mars.<ref>Wikipedia Carbonates on Mars[https://en.wikipedia.org/wiki/Carbonates_on_Mars]</ref>
−
 
+
*[[Sulfates]]
−
====Iron ore====
+
*[[Nitrates]] are sources of nitrogen for plants and industrial processes, ammonia and explosives.  Nitrates were discovered on Mars by the [[Curiosity]] rover in 2015.
−
[[Iron ore]] ( Hematite:Fe2O3) or (Magnetite: Fe3O4) is a source of iron and steel, as well as oxygen or CO2, depending on the process used.
+
*[[Salts]]. (Mg,Na)SO4, NaCl, and (Mg,Ca)CO3. Magnesium, Calcium, Sodium, Lithium, Chlorine.  Practically all minerals and elements can be found in the form of salts. Sodium chloride (NaCl) is the most common salt, and is essential for life. Chlorides are likely to be abundant on Mars.<ref>Wikipedia- Chlorides on Mars[https://en.wikipedia.org/wiki/Chloride-bearing_deposits_on_Mars]</ref>
−
 
+
*[[Thorium]] (Th) concentrations have been identified by JPL on Mars, this is the preferred fuel in a number of Molten Salt Reactor designs. <ref name=":12">Map of Martian Thorium at Mid-Latitudes,  JPL '' Map of Martian Thorium at Mid-Latitudes '', https://www.jpl.nasa.gov/spaceimages/details.php?id=PIA04257, March 2003.</ref>
−
====Alumina====
+
*[[Fluorine]] (F) has been found in small quantities on Mars.  It is an important resource if people wish to warm Mars with [[Super Greenhouse Gases]].
−
[[Alumina]] (Al2O3) is the source of aluminium.  Processing also produces CO2 or water depending on the process used.
 
−
 
 
−
====Carbonates====
 
−
Calcium carbonate (CaCO3) is used for concrete production.  Carbonates are also a potential source of carbon for carbohydrates.
 
−
 
 
−
Carbonates are available on Mars.<ref>Wikipedia Carbonates on Mars[https://en.wikipedia.org/wiki/Carbonates_on_Mars]</ref>
 
−
 
 
−
====Sulfates====
 
−
 
 
−
====Nitrates====
 
−
[[Nitrates]] are sources of nitrogen for plants and industrial processes, ammonia and explosives.  Nitrates were discovered on Mars by the [[Curiosity]] rover in 2015.
 
−
 
 
−
====Salts====
 
−
(Mg,Na)SO4, NaCl, and (Mg,Ca)CO3. Magnesium, Calcium, Sodium, lithium, Chlorine.  Practically all minerals and elements can be found in the form of salts. Sodium chloride (NaCl) is the most common salt, and is essential for life.
 
−
 
 
−
Chlorides are likely to be abundant on MArs.<ref>Wikipedia- Chlorides on Mars[https://en.wikipedia.org/wiki/Chloride-bearing_deposits_on_Mars]</ref>
 
−
 
 
−
====Thorium====
 
−
JPL has identified [[Thorium]] (Th) deposits on Mars, this is the preferred fuel in a number of Molten Salt Reactor designs. <ref name=":12">Map of Martian Thorium at Mid-Latitudes,  JPL '' Map of Martian Thorium at Mid-Latitudes '', https://www.jpl.nasa.gov/spaceimages/details.php?id=PIA04257, March 2003.</ref>
 
  
 
===Energy===
 
===Energy===
−
Energy is required to carry out ISRU.  There are two known sources of energy on Mars, the sun and nuclear fission.  Energy may be stored in a variety of ways for when the sources are not available.
+
Main article: [[Energy]]
  
−
====Solar energy====
+
Energy is required to carry out ISRU.  There are three known sources of energy on Mars: the Sun, Mars' crust and nuclear fission.  Energy may be stored in a variety of ways for when the sources are not available.
  
−
====Nuclear energy====
+
*[[Photovoltaics|Solar energy]] is a very variable energy source on Mars, unless some form Space Solar energy is used.  It requires some form of [[Energy storage|energy storage]] in the settlement or supplementary energy sources, most likely nuclear.
 +
*[[Nuclear power|Nuclear energy]] is a stable energy source and could be used extensively on Mars.  The availability of nuclear fuel on Mars needs to be explored and usable ore deposits found for a self sustainable settlement.
 +
*[[Geothermal energy]] may be available in some martian sites.  There is evidence of Martian Vulcanism in the last 50,000 to 200,000 years, so there is almost certainly geothermal energy in some areas.
 +
*[[Wind turbine|Wind power]] has been discussed for some applications.  However, Mars' air pressure is so low that this will provide negligible power compared to other sources.  If Mars' atmosphere were to be thickened, it might become a viable energy source as solar power might then become weaker.  Note that wind energy fundamentally comes from the Sun, and Mars gets about half the solar energy than the Earth does.  So it is likely that wind power will be less useful on Mars, even if it is given a thicker atmosphere than currently.  Also note that the extremely small dust particles (fines), will be hard on mechanical moving parts.
  
−
====[[Energy storage]]====
+
==Processes==
 +
[[File:New Essential Chemical Roadmap.jpg|thumb|By Nexus Aurora: Rider Barnum, Anna |alt=|800x800px]]Inputs need to be processed to create outputs
  
−
====Energy distribution====
+
===Mechanical processes===
−
 
 
−
====Embodied energy====
 
−
'''[[Embodied energy]]''' is the sum of all the energy required to produce any goods or services, considered as if that energy was incorporated or 'embodied' in the product itself.<ref>https://en.wikipedia.org/wiki/Embodied_energy</ref> Embodied energy is a useful concept for the analysis of the production of martian materials, since all materials on Mars must be produced from either nuclear or solar energy.
 
−
 
 
−
Once the cost of energy on Mars is determined, the concept of embodied energy can be used to evaluate the cost of materials, and compared to the cost of transportation from Earth.
 
−
 
 
−
==Processes==
 
  
−
===Compression===
+
*[[Compression]] of gases increases their density and can change conditions to allow for phase changes that can be used for gas separation.
−
Mechanical compression of gases increases their density
 
  
−
===Thermal processes===
+
*[[Cooling|Heating and cooling]] can also be used to accomplish phase changes in various substances.
−
Heating and cooling are important processes that can be used to accomplish phase changes in various substances.
+
*[[Crushing|Crushing and milling]]. These are mechanical processes that break minerals down to individual crystals for separation and materials handling.  Complex minerals such as basalts, granites or ores can be broken down for separation
 +
*Separation Mechanical, centrifugal,
 +
*[[Flotation]],
 +
*Distillation,
 +
*Condensation
  
−
Crushing, milling
+
===Chemical processes===
  
−
These are mechanical processes that break minerals down to individual crystals for separation and materials handling.  Complex minerals such as basalts, granites or ores can be broken down for separation
+
=====Gases=====
  
−
===Separation===
+
*Gasification
−
Mechanical, centrifugal, Flottation,Distillation, Condensation
+
*[[Reverse Water-Gas Shift Reaction]]
 +
*Haldor Topsoe CO2 electrolysis
 +
*[[Sabatier/Water Electrolysis Process]]
 +
*[[Fischer-Tropsch reaction|Fischer-Tropsch Reaction]]
 +
*Water [[Electrolysis]]
 +
*CO [[Carbon_dioxide_electrolysis]]
  
−
===Chemical reactions===
+
=====Alcohols=====
  
−
====Synthesis====
+
*Methanol synthesis
 +
*[[w:Formox_process|Formox process]].  For the production of Formaldehyde
 +
*MTO process
 +
*Dehydration
  
−
=====Hydrocarbon synthesis=====
+
=====Bio-oil derivatives=====
  
−
:''Main article: [[Hydrocarbon synthesis]]''
+
*Pyrolysis/extraction
 +
*[[Hydrodealkylation]]
 +
*Cumene process
  
−
[[Hydrocarbons]] can be manufactured by combining [[hydrogen]] and [[carbon]] through a variety of reactions.
+
=====Olefin derivatives=====
  
−
=====Silicone Synthesis=====
+
*Wacker process
 +
*Vinyl acetate monomer
 +
*[[Polymerization]]
 +
*[[Hydroformylation]]
 +
*[[Hydrogenation]]
  
−
:''Main article: [[Silicone synthesis ]]''
+
=====Direct ethylene glycol synthesis=====
−
:*[[Sabatier/Water Electrolysis Process]]
 
−
:*[[Reverse Water-Gas Shift Reaction]]
 
−
:*[[Fischer-Tropsch reaction|Fischer-Tropsch Reaction]]
 
  
−
====Decomposition====
+
====[[Hydrocarbon synthesis]]====
  
−
=====Electrolysis=====
+
Hydrocarbons can be manufactured by combining  and [[carbon]] through a variety of reactions
−
Deoxidation (usually, but not exclusively) of a compound into individual elements
 
  
−
====single and double replacements.====
+
====[[Silicone Synthesis]]====
  
−
==Utilization==
+
=====Reduction=====
−
{{expandsec}}
+
Usually, but not exclusively, a separation of a compound into individual elements.  [[Iron ore]] into iron and oxygen, for example.
−
===Water===
 
−
Water is essential for life.  It is also a common process reagent, an excellent coolant for industrial processes and a source of hydrogen and oxygen using electrolysis.
 
  
−
On Mars it can also be used as a construction material or as radiation shielding.  It can be condensed out of the atmosphere or extracted from the regolith.
+
===Biological processes===
−
===Breathable Atmosphere===
 
−
A breathable atmosphere is a basic requirement for life.  It is also needed for heat transfer from people, plants and animals.  Is is obtained from compression of the martian atmosphere, separation of excess CO2 and addition of oxygen to reach the desired proportions, that depend on the chosen atmospheric pressure in the habitats.
 
  
−
===Habitats===
+
*[[Fermentation]]
−
Habitats, including living and production areas, are assembled from manufactured products or possible naturally occurring areas sur as lava tubes, to create living areas for the colonists, plants and animals.
+
*[[Biomethanisation]]
  
−
===Food production===
+
==Products (Outputs)==
  
−
=====Agriculture=====
+
=====Solids=====
−
[[Plants]] are natural factories, capable of utilizing the atmosphere and regolith to grow and reproduce.
 
  
−
===Manufactured Products===
+
*[[Sand]] is one of the most common building materials.  Composition varies greatly.
 +
*[[Gravel]]
 +
*[[Cement]]  is a binder used to link together elements such as blocks and bricks or gravel and sand to produce concrete.
 +
*[[Concrete]]
 +
*[[Sulphur Concrete]] uses molten sulphur (120 degrees C) to act as binder for concrete.
 +
*[[StarCrete]] is a concrete made with starch, a bit of salt, & [[Regolith]].
 +
*[[Compressed regolith]]
 +
*[[Glass]] is one of the most common building materials on Earth and should be common on Mars as well, since it has unique properties of low cost and transparency.  Silica (SiO2), the main component of glass, is also the most common material in the Martian crust.
  
−
====Propellant====
+
*[[Ceramics]]
−
Propellant is one of the main ISRU products.  It is required to make transportation less prohibitively expensive.
 
  
−
====Cements, concretes and compressed regolith====
+
*[[Fertilizer]] (N....)
  
−
====Iron and steel====
+
*[[Biochar]] (Cx)
−
Iron and [[steel]]  
+
*[[Synthetic materials|Synthetic Polymers]] and [[Carbon fiber|carbon fiber]] precursors
 +
**[[Polyethylene]] (PE)
 +
**[[Polypropylene]] (PP)
 +
**[[Polyester]] (PET)
 +
**[[Polyvinyl Chloride|Polyvinyl chloride]] (PVC)
 +
**Polyamides (Nylon)
 +
**Polytetrafluoroethylene (PTFE,Teflon)
 +
*[[Biomass]]
 +
*
  
−
====Aluminium====
+
=====Metals=====
  
−
====Glass====
+
*[[Iron]]
−
[[Glass]] is one of the most common building materials on Earth and should be common on Mars as well, since it has unique properties of low cost and transparency.  Silica, the main component of glass, is also the most common material in the martian crust.
+
*[[steel]]
 +
*[[Aluminium|Aluminum]]
 +
*[[Copper]]
 +
*[[Nickel]]
 +
*[[Silicon]]
  
−
====Ceramics====
+
===Liquids===
  
−
====Ammonia fertilizer====
+
*[[Water]] (H<sub>2</sub>O).  Essential for life.  It is also a common process reagent, an excellent coolant for industrial processes and a source of hydrogen and oxygen using electrolysis.  On Mars it can also be used as a construction material or as radiation shielding.  It can be condensed out of the atmosphere or extracted from the regolith.
 +
*[[Ammonia]] (NH<sub>3</sub>)
 +
*[[Hydrocarbons]]
 +
**
 +
**Light olefins
 +
**Light alkenes
 +
**[[Benzene]]<nowiki/>s
 +
**[[Phenol]]
 +
**[[Acetone]]
 +
**Bio-oil
 +
*[[Alcool|Alcools]]
 +
**[[Ethanol]] (C<sub>2</sub>H<sub>5</sub>OH)
 +
**[[Methanol]] ([[Carbon|C]][[Hydrogen|H]]<sub>3</sub>[[Oxygen|O]]H)
 +
*[[Acid|Acids]]
 +
**[[Acetic acid]] (C<sub>2</sub>H<sub>4</sub>O<sub>2</sub>)
 +
**[[Sulfuric acid]] (H<sub>2</sub>SO<sub>4</sub>)
 +
**[[Aspirin|Salicylic acid]]
 +
*
 +
*
 +
*
 +
*
  
−
====Hydrocarbons and plastics====
+
===Gases===
 +
A breathable atmosphere is a basic requirement for life.  It is also needed for heat transfer from people, plants and animals.  It is obtained by starting with oxygen and adding buffer gases to reach the desired proportions.  Humans can breath pure oxygen at 1/5 atmospheric pressure, but adding buffer gases such as nitrogen or argon is desirable.  It is likely that people will choose an air pressure less than one atmosphere for early settlements on Mars.  Carbon dioxide is required for plants but must be kept to about 1000 ppm or less, as it rapidly becomes toxic at even low partial pressures.  Carbon monoxide is even more toxic and must be removed from the settlement atmosphere.
  
−
==See Also==
+
*[[Oxygen]] (O<sub>2</sub>)
 +
*[[hydrogen]] (H<sub>2</sub>)
 +
*[[Nitrogen]] (N<sub>2</sub>)
 +
*[[Argon]] (Ar)
 +
*[[Carbon dioxide|Carbon dioxide]] (CO<sub>2</sub>)
 +
*[[Carbon monoxide|Carbon monoxide]] (CO)
 +
*[[Hydrocarbons]]
 +
**[[Methane]] (CH<sub>4</sub>)
 +
**[[Ethylene]] (C<sub>2</sub>H<sub>4</sub>)
 +
**[[Propane|Propane (C<sub>3</sub>H<sub>8</sub>)]]
 +
**[[Butane]] (C<sub>4</sub>H<sub>10</sub>)
 +
**[[Propylene]] (C<sub>3</sub>H<sub>6</sub>)
 +
**[[Acetylene]] (C<sub>2</sub>H<sub>2</sub>)
 +
**[[Formaldehyde]] ( CH<sub>2</sub>O)
 +
**[[Vinyl Chloride]] (C<sub>2</sub>H<sub>3</sub>Cl)
 +
*
  
 
==References==
 
==References==
 
[[Category:In-situ Resource Utilization]]
 
[[Category:In-situ Resource Utilization]]
 
<references />
 
<references />

Latest revision as of 11:37, 4 November 2024

Dust collectorCompressionCarbon monoxideCompressionCarbon dioxideNitratesAtmospheric processingNitrogenOxygenSabatier processMethaneWaterElectrolysisHydrogenMiningMiningFertilizerGlassIron ore
In Situ resources Utilisation. Copyright R. Heidmann

The use of local resources is called in-situ resource utilization or ISRU. This concept is critical to the survival of an autonomous or semi-autonomous settlement. The ISRU timeline is very rapid for most settlement plans since the initial Zubrin proposal of MArs Direct.

Resources(inputs) are processed to create products(outputs). These outputs can become inputs to other processes used to create new, more complex outputs. Eventually, the outputs can be re-used by recycling, reducing the needs for new resources. However, losses are always present is systems, making the acquisition of new resources a continuous requirement. The presence of numerous resources on Mars is part of what makes it an interesting target for colonization and settlement.

Production processes require energy to operate and must be housed in production facilities.

Resources (Inputs)

Atmosphere

Main article: Atmospheric processing

Many of the elements and molecules in the atmosphere can be utilized. Condensation, followed by distillation, are often used to extract resources. The atmosphere is first cooled to a liquid or solid state. This is distilled at precise temperatures in order to separate the elements and molecules.

  • Carbon dioxide (CO2) composes 96% of the martian atmosphere. Carbon dioxide is the main source of carbon, used for fuel production (CH4) and an essential element for life. Carbon dioxide also serves as a source of oxygen for the settlement atmosphere and as the oxidizer in bi-propellant fuels.
  • Nitrogen composes 2% of martian atmosphere. Nitrogen is used by plants and is part of a breathable atmosphere. Its concentration on Earth is 78% of the atmosphere.
  • Argon is an inert gas, useful in some industrial processes as an inert atmosphere and may be used as propellant in Electric Propulsion of spaceships.2% of martian atmosphere
  • Water (H2O) is the main source of hydrogen and oxygen. Oxygen is required for the settlement atmosphere and hydrogen is used for fuel production (CH4) and for the synthesis of hydrocarbons, the building blocks for life.

Lithosphere (surface)

Main article: Mining

Minerals in the crust of Mars must be mined and processed to be useful. The upper layer of Mars surface is called the Regolith. It is a mixtures of materials of various interest.

  • Water can be gathered in a variety of ways. It is available in the form of water ice or as hydrated minerals.
  • Silicates (SiO2) are useful for the production of glass and building materials. It is one of the main components of the martian planetary crust.
  • Iron ore ( Hematite:Fe2O3) or (Magnetite: Fe3O4) is a source of iron and steel, as well as oxygen or CO2, depending on the process used.
  • Alumina (Al2O3) is the source of aluminium. Processing also produces CO2, oxygen or water, depending on the process used.
  • Calcium carbonate (CaCO3) is used for concrete production. Carbonates are also a potential source of carbon for carbohydrates. Sodium carbonates are used in glass production. Carbonates are available on Mars.[1]
  • Sulfates
  • Nitrates are sources of nitrogen for plants and industrial processes, ammonia and explosives. Nitrates were discovered on Mars by the Curiosity rover in 2015.
  • Salts. (Mg,Na)SO4, NaCl, and (Mg,Ca)CO3. Magnesium, Calcium, Sodium, Lithium, Chlorine. Practically all minerals and elements can be found in the form of salts. Sodium chloride (NaCl) is the most common salt, and is essential for life. Chlorides are likely to be abundant on Mars.[2]
  • Thorium (Th) concentrations have been identified by JPL on Mars, this is the preferred fuel in a number of Molten Salt Reactor designs. [3]
  • Fluorine (F) has been found in small quantities on Mars. It is an important resource if people wish to warm Mars with Super Greenhouse Gases.

Energy

Main article: Energy

Energy is required to carry out ISRU. There are three known sources of energy on Mars: the Sun, Mars' crust and nuclear fission. Energy may be stored in a variety of ways for when the sources are not available.

  • Solar energy is a very variable energy source on Mars, unless some form Space Solar energy is used. It requires some form of energy storage in the settlement or supplementary energy sources, most likely nuclear.
  • Nuclear energy is a stable energy source and could be used extensively on Mars. The availability of nuclear fuel on Mars needs to be explored and usable ore deposits found for a self sustainable settlement.
  • Geothermal energy may be available in some martian sites. There is evidence of Martian Vulcanism in the last 50,000 to 200,000 years, so there is almost certainly geothermal energy in some areas.
  • Wind power has been discussed for some applications. However, Mars' air pressure is so low that this will provide negligible power compared to other sources. If Mars' atmosphere were to be thickened, it might become a viable energy source as solar power might then become weaker. Note that wind energy fundamentally comes from the Sun, and Mars gets about half the solar energy than the Earth does. So it is likely that wind power will be less useful on Mars, even if it is given a thicker atmosphere than currently. Also note that the extremely small dust particles (fines), will be hard on mechanical moving parts.

Processes

By Nexus Aurora: Rider Barnum, Anna

Inputs need to be processed to create outputs

Mechanical processes

  • Compression of gases increases their density and can change conditions to allow for phase changes that can be used for gas separation.
  • Heating and cooling can also be used to accomplish phase changes in various substances.
  • Crushing and milling. These are mechanical processes that break minerals down to individual crystals for separation and materials handling. Complex minerals such as basalts, granites or ores can be broken down for separation
  • Separation Mechanical, centrifugal,
  • Flotation,
  • Distillation,
  • Condensation

Chemical processes

Gases
Alcohols
  • Methanol synthesis
  • Formox process. For the production of Formaldehyde
  • MTO process
  • Dehydration
Bio-oil derivatives
Olefin derivatives
Direct ethylene glycol synthesis

Hydrocarbon synthesis

Hydrocarbons can be manufactured by combining and carbon through a variety of reactions

Silicone Synthesis

Reduction

Usually, but not exclusively, a separation of a compound into individual elements. Iron ore into iron and oxygen, for example.

Biological processes

Products (Outputs)

Solids
  • Sand is one of the most common building materials. Composition varies greatly.
  • Gravel
  • Cement is a binder used to link together elements such as blocks and bricks or gravel and sand to produce concrete.
  • Concrete
  • Sulphur Concrete uses molten sulphur (120 degrees C) to act as binder for concrete.
  • StarCrete is a concrete made with starch, a bit of salt, & Regolith.
  • Compressed regolith
  • Glass is one of the most common building materials on Earth and should be common on Mars as well, since it has unique properties of low cost and transparency. Silica (SiO2), the main component of glass, is also the most common material in the Martian crust.
Metals

Liquids

Gases

A breathable atmosphere is a basic requirement for life. It is also needed for heat transfer from people, plants and animals. It is obtained by starting with oxygen and adding buffer gases to reach the desired proportions. Humans can breath pure oxygen at 1/5 atmospheric pressure, but adding buffer gases such as nitrogen or argon is desirable. It is likely that people will choose an air pressure less than one atmosphere for early settlements on Mars. Carbon dioxide is required for plants but must be kept to about 1000 ppm or less, as it rapidly becomes toxic at even low partial pressures. Carbon monoxide is even more toxic and must be removed from the settlement atmosphere.

References

  1. ↑ Wikipedia Carbonates on Mars[1]
  2. ↑ Wikipedia- Chlorides on Mars[2]
  3. ↑ Map of Martian Thorium at Mid-Latitudes, JPL Map of Martian Thorium at Mid-Latitudes , https://www.jpl.nasa.gov/spaceimages/details.php?id=PIA04257, March 2003.
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