Method and system for producing oxygen, iron and titanium from lunar soil

Abstract

The invention provides a method and a system for producing oxygen, iron and titanium from lunar soil. The system comprises an oxygen production subsystem, an iron production subsystem and a titanium production subsystem, the oxygen generation subsystem comprises a reduction reactor, a water separator, a water electrolyzer, a liquefier and a liquid oxygen storage tank which are connected in sequence; the iron manufacturing subsystem comprises a carbonylation reactor, a pyrolyzer and an iron storage tank which are connected in sequence; the titanium preparation subsystem comprises a die casting device, a molten salt electrolyzer, and an oxygen separator and a titanium storage tank which are connected with the molten salt electrolyzer; wherein the reduction reactor, the carbonylation reactor and the die casting device are connected in sequence. The comprehensive utilization of the lunar soil ilmenite raw material is realized, the raw material is converted into useful oxygen, metal iron powder and porous metal titanium after being treated by the system, and the method has the characteristics of high oxygen yield, high raw material utilization rate and high system efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of space resource development and utilization, and in particular to a method and system for producing oxygen, iron and titanium from lunar soil. Background Art

[0003] Future manned deep space exploration missions will achieve long-term and sustainable human presence on extraterrestrial bodies, which requires humans to have the ability to develop and utilize space resources. Lunar soil is an important resource on the moon, covering all areas on the moon except rocky cliffs, and its oxygen content is about 43wt.%. Lunar soil oxygen production technology is an important technology in the field of space resource development and utilization. At present, the international methods and technologies for lunar soil oxygen production mainly include hydrogen reduction method, methane reduction method, fluorination method, molten salt electrolysis method, etc.

[0004] However, the lunar soil oxygen production methods in the above technologies generally have problems such as low oxygen yield, low raw material utilization, and low system efficiency. Summary of the invention

[0005] In order to solve the technical problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a method and system for producing oxygen, iron and titanium from lunar soil, which has the characteristics of high oxygen yield, high raw material utilization rate and high system efficiency.

[0006] In order to achieve the above-mentioned invention object, the present invention provides a system for producing oxygen, iron and titanium from lunar soil, including an oxygen production subsystem, an iron production subsystem and a titanium production subsystem;

[0007] The oxygen production subsystem includes a reduction reactor, a water separator, a water electrolyzer, a liquefier, and a liquid oxygen storage tank which are connected in sequence;

[0008] The iron-making subsystem includes a carbonylation reactor, a pyrolyzer, and an iron storage tank connected in sequence;

[0009] The titanium production subsystem includes a die-casting device and a molten salt electrolyzer, as well as an oxygen separator and a titanium storage tank connected to the molten salt electrolyzer;

[0010] Wherein, the reduction reactor, the carbonylation reactor and the die casting device are connected in sequence.

[0011] According to a technical solution of the present invention, the oxygen production subsystem is equipped with a hydrogen circulation subsystem, and the hydrogen circulation subsystem includes the hydrogen storage tank for introducing hydrogen into the reduction reactor;

[0012] The air inlet end of the hydrogen storage tank is communicated with at least the water separator and the water electrolyzer.

[0013] According to a technical solution of the present invention, the iron-making subsystem is equipped with a carbon monoxide circulation subsystem, and the carbon monoxide circulation subsystem includes the carbon monoxide storage tank for introducing carbon monoxide into the carbonylation reactor;

[0014] The air inlet end of the carbon monoxide storage tank is at least communicated with the pyrolyzer.

[0015] According to a technical solution of the present invention, an electrolyte circulation pipeline is further provided between the molten salt electrolyzer and the oxygen separator.

[0016] According to a technical solution of the present invention, the oxygen generated by the oxygen separator is connected to the liquid oxygen storage tank through the liquefier.

[0017] According to a technical solution of the present invention, the reaction temperature in the reduction reactor is 900-1200°C, the reaction pressure is 0.01-50MPa, and the molar ratio of reactants is 1:1-1:300;

[0018] The electrolysis temperature in the water electrolyzer is 50-90° C., and the pressure is 0.05-2 MPa.

[0019] According to a technical solution of the present invention, the reaction temperature in the carbonylation reactor is 100-300°C, the pressure is 1-30MPa, and the molar ratio of reactants is 1:1-1:1000;

[0020] The reaction temperature in the pyrolyzer is 110-500° C., and the reaction pressure is 0.01-1 MPa.

[0021] According to a technical solution of the present invention, the die-casting temperature of the die-casting device is 0-500°C and the pressure is 1-1000MPa;

[0022] The titanium slag electrode obtained by die casting is in the shape of a flat plate, a cylindrical surface, a cuboid or a cylinder.

[0023] According to a technical solution of the present invention, the electrolysis voltage in the molten salt electrolyzer is 1-100V, the electrolysis current is 0.1-20A, the temperature is 500-1000°C, the pressure is 0.01-10MPa, the titanium slag electrode is the cathode, and the anode is graphite, precious metal or conductive ceramic.

[0024] According to another aspect of the present invention, there is provided a method for producing oxygen, iron and titanium using the system described in any one of the above technical solutions, comprising:

[0025] The lunar soil ilmenite raw material is fed into the reduction reactor, and the reducing gas hydrogen is introduced;

[0026] Sending a first gas product including hydrogen and water vapor into the water separator, and sending a first solid product including iron-titanium slag into the carbonylation reactor;

[0027] The water separated by the water separator is sent to the water electrolyzer, and the separated hydrogen is recycled;

[0028] The oxygen obtained by electrolysis of the water electrolyzer is recovered through the liquefier and the liquid oxygen storage tank, and the obtained hydrogen is recycled;

[0029] Carbon monoxide is introduced into the carbonylation reactor, and the second gas product including pentacarbonyl iron obtained by the reaction is passed through a pyrolyzer and an iron storage tank to complete iron powder recovery;

[0030] The second solid product including titanium slag obtained in the carbonylation reactor is fed into the die casting device to obtain a titanium slag electrode;

[0031] Electrolysis is carried out in the molten salt electrolyzer using a titanium slag electrode as a cathode and graphite, precious metal or conductive ceramic as an anode to obtain porous titanium and oxygen. The oxygen is recovered through the liquefier and the liquid oxygen storage tank, and the porous titanium is recovered using the titanium storage tank.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The present invention proposes a method and system for producing oxygen, iron and titanium from lunar soil, which has the characteristics of high oxygen yield, high raw material utilization rate and high system efficiency.

[0034] The present invention uses ilmenite in lunar soil as raw material. Its oxygen production subsystem produces oxygen through hydrogen reduction reaction and water electrolysis reaction. Its iron production subsystem produces iron powder through iron carbonylation reaction and its reverse reaction. Its titanium production subsystem produces porous titanium and oxygen through electrolysis reaction of titanium oxide in molten salt electrolyte, thereby realizing the comprehensive utilization of lunar soil ilmenite raw material. The raw materials are converted into useful oxygen, metallic iron powder and porous metallic titanium after system processing. The oxygen can be used as rocket propellant for space vehicles and life support for astronauts on the moon. The iron powder and porous titanium can be used as raw materials for in-situ additive manufacturing and construction in space, laying a foundation for the development and utilization of lunar soil resources.

[0035] The present invention uses ilmenite in lunar soil as raw material, and utilizes the method and system of the present invention to prepare oxygen, iron and titanium. On the one hand, the oxygen production subsystem extracts the oxygen element in the raw material through the reaction of hydrogen and ferrous oxide in the lunar soil ilmenite; on the other hand, the titanium production subsystem further extracts the oxygen element in the raw material through the electrolysis reaction of titanium oxide in the lunar soil ilmenite in molten salt. The theoretical oxygen yield of the present invention is increased to 32% compared with 11% of the method of producing oxygen by reducing lunar soil ilmenite with hydrogen, which can effectively improve the oxygen production efficiency.

[0036] In the present invention, the titanium slag produced by the carbonylation reactor of the iron-making subsystem is subjected to the molten salt electrolysis reaction of the titanium-making subsystem to obtain porous titanium, which is beneficial to improving the utilization rate of the raw materials.

[0037] In the present invention, the iron-making subsystem utilizes the carbonylation reaction of iron to recover iron, and has the characteristic of high reaction selectivity. The FeTiO3 content in the lunar soil ilmenite is as high as 98.5%, so the iron powder obtained after thermal decomposition of pentacarbonyl iron has high purity.

[0038] Furthermore, the iron-making subsystem of the present invention can improve the conversion rate of iron in ferro-titanium slag by circulating carbon monoxide gas, so that the purity of titanium oxide in the titanium slag after the carbonylation reaction is high, and the purity of porous titanium obtained after the titanium slag is further subjected to molten salt electrolysis reaction is high.

[0039] In the present invention, the oxygen production subsystem and the iron production subsystem and the oxygen production method and the iron production method can also be used to produce oxygen and iron from other stellar soils containing ferrous oxide or ferric oxide, such as Martian soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 This is a composition diagram of a system for producing oxygen, iron and titanium from lunar soil in one embodiment of the present invention;

[0042] Figure 2 This is a working principle diagram of a system for producing oxygen, iron and titanium from lunar soil in one embodiment of the present invention;

[0043] Figure 3 This is a working principle diagram of an oxygen production subsystem in one embodiment of the present invention;

[0044] Figure 4 A schematic diagram of the working principle of the iron making subsystem in one embodiment of the present invention;

[0045] Figure 5 This is a working principle diagram of the titanium making subsystem in one embodiment of the present invention.

[0046] The corresponding relationship between the reference numerals and component names is as follows:

[0047] 1. Oxygen production subsystem; 2. Iron production subsystem; 3. Titanium production subsystem;

[0048] 11. Reduction reactor; 12. Water separator; 13. Water electrolyzer; 14. Hydrogen storage tank; 15. Liquefier; 16. Liquid oxygen storage tank;

[0049] 21. Carbonylation reactor; 22. Pyrolyzer; 23. Carbon monoxide storage tank; 24. Iron storage tank;

[0050] 31. Die casting machine; 32. Molten salt electrolyzer; 33. Oxygen separator; 34. Titanium storage tank. DETAILED DESCRIPTION

[0051] The description of the embodiments of this specification should be combined with the corresponding drawings, which should be considered as part of the complete specification. In the drawings, the shape or thickness of the embodiments may be enlarged and indicated for simplification or convenience. Furthermore, the parts of each structure in the drawings will be described separately. It is worth noting that the elements not shown in the drawings or not described in words are in a form known to ordinary technicians in the relevant technical field.

[0052] The description of the embodiments herein and any reference to directions and orientations are only for the convenience of description and are not to be construed as any limitation on the scope of protection of the present invention. The following description of the preferred embodiments may involve combinations of features, which may exist independently or in combination, and the present invention is not particularly limited to the preferred embodiments. The scope of the present invention is defined by the claims.

[0053] like Figures 1 to 5 As shown, the present invention provides a system for producing oxygen, iron and titanium from lunar soil, including an oxygen production subsystem, an iron production subsystem and a titanium production subsystem;

[0054] The oxygen production subsystem includes a reduction reactor, a water separator, a water electrolyzer, a liquefier, and a liquid oxygen storage tank connected in sequence;

[0055] The iron-making subsystem includes a carbonylation reactor, a pyrolyzer, and an iron storage tank connected in sequence;

[0056] The titanium production subsystem includes a die-caster and a molten salt electrolyzer, as well as an oxygen separator and a titanium storage tank connected to the molten salt electrolyzer;

[0057] Among them, the reduction reactor, the carbonylation reactor and the die casting device are connected in sequence.

[0058] In the present invention, the lunar soil contains a large amount of ilmenite. The lunar soil ilmenite is used as raw material, and FeTiO3 in the lunar soil ilmenite is used to prepare Fe, Ti and O2, so as to realize the development and utilization of lunar soil resources and enhance my country's ability to develop and utilize space resources.

[0059] like Figure 3As shown, the oxygen production subsystem includes a reduction reactor, a water separator, a water electrolyzer, a liquefier, and a liquid oxygen storage tank. Hydrogen is continuously introduced into the reduction reactor, and the reduction effect of hydrogen is used to reduce the lunar soil ilmenite particles to obtain Fe, TiO2 and H2O. The specific chemical reaction formula is: FeTiO3+H2→Fe+TiO2+H2O; water vapor is converted into liquid water after passing through the water separator, and the liquid water then undergoes an electrolysis reaction through the water electrolyzer to generate hydrogen and oxygen. The chemical reaction formula is: 2H2O→2H2+O2; the generated oxygen is converted into liquid oxygen through a liquefier and stored in a liquid oxygen storage tank.

[0060] like Figure 4 As shown, the iron-making subsystem includes a carbonylation reactor, a pyrolyzer, and an iron storage tank. The carbonylation reactor is connected to the reduction reactor. The ferrotitanium slag (iron and titanium oxide solid slag) produced by the reduction reactor is fed into the carbonylation reactor, and carbon monoxide gas is introduced into the carbonylation reactor. The carbon monoxide gas and the ferrotitanium slag undergo a carbonylation reaction in the carbonylation reactor to generate pentacarbonyl iron gas. The specific chemical reaction formula is: Fe+5CO→Fe(CO)5, and the main component of the slag remaining in the carbonylation reactor is titanium oxide TiO2; the pentacarbonyl iron gas enters the pyrolyzer to undergo a pyrolysis reaction to generate carbon monoxide gas and iron powder. Finally, the iron powder is collected and loaded into the iron storage tank.

[0061] like Figure 5 As shown, the titanium production subsystem mainly includes a die caster and a molten salt electrolyzer. The solid slag remaining in the carbonylation reactor (i.e., titanium slag, the main component of which is titanium oxide TiO2) is fed into the die caster and die-cast into a titanium slag electrode. The titanium slag electrode is used as a cathode, and graphite, precious metals or conductive ceramics are used as an anode. An electrolytic reaction occurs in the molten salt electrolyzer to generate porous titanium and oxygen. The specific chemical reaction formula is: TiO2→Ti+O2. Finally, the obtained porous titanium metal is loaded into a titanium storage tank.

[0062] In the present invention, ilmenite in the lunar soil is used as raw material, and an oxygen production subsystem, an iron production subsystem, and a titanium production subsystem are utilized to realize the comprehensive utilization of the lunar soil ilmenite raw material, so that the raw material is converted into useful oxygen, metallic iron powder, and porous metallic titanium after being processed by the system. The oxygen can be used as rocket propellant for space vehicles and life support for astronauts on the moon, and the iron powder and porous titanium can be used as raw materials for in-situ additive manufacturing and construction in space, thereby providing a method and laying a foundation for the development and utilization of lunar soil resources.

[0063] Furthermore, the system for producing oxygen, iron and titanium from lunar soil of the present invention has the characteristics of high iron powder purity and high oxygen element recovery efficiency.

[0064] In some embodiments of the present invention, the oxygen production subsystem is equipped with a hydrogen circulation subsystem, which includes a hydrogen storage tank and related pipelines and valve equipment for introducing hydrogen into the reduction reactor;

[0065] The air inlet end of the hydrogen storage tank is at least connected to the water separator and the water electrolyzer.

[0066] In the oxygen production subsystem, when h2 reacts with FeTiO3, the generated water vapor will take away some of the unreacted H2, and a water separator will be used to separate H2 and H2O. The gas output port of the water separator is connected to the air inlet end of the hydrogen storage tank, so that the unreacted hydrogen can be recovered. After the water vapor is converted into liquid water, it enters the water electrolyzer. After electrolysis, hydrogen is obtained at the cathode and oxygen is obtained at the anode. The hydrogen at the cathode is directly recovered through the hydrogen storage tank, realizing the recycling of hydrogen, improving the utilization rate of hydrogen, and reducing pollutant output.

[0067] In some embodiments of the present invention, the iron-making subsystem is equipped with a carbon monoxide circulation subsystem, which includes a carbon monoxide storage tank and related pipelines and valves for introducing carbon monoxide into the carbonylation reactor;

[0068] The air inlet end of the carbon monoxide storage tank is at least communicated with the pyrolyzer.

[0069] In the iron-making subsystem, carbon monoxide is needed to carry out carbonylation reaction to obtain gaseous pentacarbonyl iron. In the pyrolyzer, pentacarbonyl iron will be converted into carbon monoxide gas and solid iron powder. Similar to hydrogen, the air inlet end of the carbon monoxide storage tank is connected to the pyrolyzer, and the carbon monoxide obtained by pyrolysis is recovered to the carbon monoxide storage tank, realizing the recycling of carbon monoxide, improving the utilization rate of carbon monoxide, and reducing pollutant output.

[0070] In some embodiments of the present invention, an electrolyte circulation pipeline is also provided between the molten salt electrolyzer and the oxygen separator. The titanium production subsystem produces porous titanium and oxygen through the electrolysis reaction of titanium oxide in the molten salt electrolyte. The electrolyte is returned to the molten salt electrolyzer for recycling, thereby improving the utilization rate of the electrolyte and reducing the cost.

[0071] In some embodiments of the present invention, the oxygen generated by the oxygen separator is connected to the liquid oxygen storage tank through a liquefier.

[0072] In the titanium production subsystem, titanium oxide is electrolyzed in a molten salt electrolyte to obtain porous titanium and oxygen. The oxygen and the volatilized electrolyte gas are separated by an oxygen separator. The separated oxygen is then converted into liquid oxygen by a liquefier and stored in a liquid oxygen storage tank. The oxygen element is further extracted from the lunar soil ilmenite raw material. Therefore, the oxygen production subsystem and the titanium production subsystem of the present invention can both recycle the oxygen element. Compared with the method of producing oxygen by reducing lunar soil with hydrogen, the theoretical oxygen yield of the present invention can reach 32%, which can effectively improve the oxygen production efficiency.

[0073] In some embodiments of the present invention, the reaction temperature in the reduction reactor is 900-1200° C., preferably 980° C., the reaction pressure is 0.01-50 MPa, and the molar ratio of reactants is 1:1-1:300;

[0074] The electrolysis temperature in the water electrolyzer is 50 to 90° C., preferably 80° C., and the pressure is 0.05 to 2 MPa.

[0075] In some embodiments of the present invention, the reaction temperature in the carbonylation reactor is 100 to 300° C., preferably 280° C., the pressure is 1 to 30 MPa, and the molar ratio of reactants is 1:1 to 1:1000;

[0076] The reaction temperature in the pyrolyzer is 110-500°C, preferably 200°C, and the reaction pressure is 0.01-1 MPa.

[0077] In some embodiments of the present invention, the die-casting temperature of the die-casting machine is 0 to 500° C., preferably 300° C., and the pressure is 1 to 1000 MPa;

[0078] The titanium slag electrode obtained by die casting is in the shape of a flat plate, a cylindrical surface, a cuboid or a cylinder.

[0079] In some embodiments of the present invention, the electrolysis voltage in the molten salt electrolyzer is 1-100V, the electrolysis current is 0.1-20A, the temperature is 500-1000°C, preferably 900°C, the pressure is 0.01-10MPa, the titanium slag electrode is the cathode, and the anode is graphite, precious metal or conductive ceramic.

[0080] According to another aspect of the present invention, there is provided a method for producing oxygen, iron and titanium using a system as in any one of the above technical solutions, comprising:

[0081] The lunar soil ilmenite raw material is fed into a reduction reactor, and hydrogen is introduced as a reducing gas;

[0082] The first gas product including hydrogen and water vapor is fed into a water separator, and the first solid product including iron-titanium slag is fed into a carbonylation reactor;

[0083] The water separated by the water separator is sent to the water electrolyzer, and the separated hydrogen is recycled;

[0084] The oxygen obtained by electrolysis of the water electrolyzer is recovered and stored through a liquefier and a liquid oxygen storage tank, and the obtained hydrogen is recycled;

[0085] Carbon monoxide is introduced into the carbonylation reactor, and the second gas product including pentacarbonyl iron obtained by the reaction is passed through a pyrolyzer and an iron storage tank to complete iron powder recovery and storage;

[0086] The second solid product including titanium slag obtained in the carbonylation reactor is fed into a die casting device to obtain a titanium slag electrode;

[0087] Electrolysis is carried out in a molten salt electrolyzer using a titanium slag electrode as a cathode and graphite, precious metals or conductive ceramics as an anode to obtain porous titanium and oxygen. The oxygen is recovered and stored through a liquefier and a liquid oxygen storage tank, while the porous titanium is recovered and stored in a titanium storage tank.

[0088] The method of the present invention for preparing oxygen, iron and titanium using lunar soil ilmenite has the same technical effect as the above-mentioned system and will not be described in detail here.

[0089] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. It can also be a reasonable combination of the features recorded in the above embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for producing oxygen, iron and titanium from lunar soil, characterized in that: It includes oxygen production subsystem, iron production subsystem and titanium production subsystem; The oxygen production subsystem includes a reduction reactor, a water separator, a water electrolyzer, a liquefier, and a liquid oxygen storage tank which are connected in sequence; The iron-making subsystem includes a carbonylation reactor, a pyrolyzer, and an iron storage tank connected in sequence; The titanium production subsystem includes a die-casting device and a molten salt electrolyzer, as well as an oxygen separator and a titanium storage tank connected to the molten salt electrolyzer; Wherein, the reduction reactor, the carbonylation reactor and the die casting device are connected in sequence.

2. The system for producing oxygen, iron and titanium from lunar soil according to claim 1 is characterized in that: The oxygen production subsystem is equipped with a hydrogen circulation subsystem, and the hydrogen circulation subsystem includes the hydrogen storage tank for introducing hydrogen into the reduction reactor; The air inlet end of the hydrogen storage tank is communicated with at least the water separator and the water electrolyzer.

3. The system for producing oxygen, iron and titanium from lunar soil according to claim 2 is characterized in that: The iron-making subsystem is equipped with a carbon monoxide circulation subsystem, and the carbon monoxide circulation subsystem includes the carbon monoxide storage tank for introducing carbon monoxide into the carbonylation reactor; The air inlet end of the carbon monoxide storage tank is at least communicated with the pyrolyzer.

4. The system for producing oxygen, iron and titanium from lunar soil according to claim 1, characterized in that: An electrolyte circulation pipeline is also provided between the molten salt electrolyzer and the oxygen separator.

5. The system for producing oxygen, iron and titanium from lunar soil according to claim 1 is characterized in that: The oxygen generated by the oxygen separator is connected to the liquid oxygen storage tank through the liquefier.

6. The system for producing oxygen, iron and titanium from lunar soil according to claim 1, characterized in that: The reaction temperature in the reduction reactor is 900-1200° C., the reaction pressure is 0.01-50 MPa, and the molar ratio of reactants is 1:1-1:300; The electrolysis temperature in the water electrolyzer is 50-90° C., and the pressure is 0.05-2 MPa.

7. The system for producing oxygen, iron and titanium from lunar soil according to claim 1 is characterized in that: The reaction temperature in the carbonylation reactor is 100-300°C, the pressure is 1-30MPa, and the molar ratio of reactants is 1:1-1:1000; The reaction temperature in the pyrolyzer is 110-500° C., and the reaction pressure is 0.01-1 MPa.

8. The system for producing oxygen, iron and titanium from lunar soil according to claim 1 is characterized in that: The die casting temperature of the die casting device is 0-500°C and the pressure is 1-1000MPa; The titanium slag electrode obtained by die casting is in the shape of a flat plate, a cylindrical surface, a cuboid or a cylinder.

9. The system for producing oxygen, iron and titanium from lunar soil according to claim 8, characterized in that: The electrolysis voltage in the molten salt electrolyzer is 1-100V, the electrolysis current is 0.1-20A, the temperature is 500-1000°C, the pressure is 0.01-10MPa, the titanium slag electrode is the cathode, and the anode is graphite, precious metal or conductive ceramic.

10. A method for producing oxygen, iron and titanium using the system according to any one of claims 1 to 9, characterized in that: include: The lunar soil ilmenite raw material is fed into the reduction reactor, and the reducing gas hydrogen is introduced; Sending a first gas product including hydrogen and water vapor into the water separator, and sending a first solid product including iron-titanium slag into the carbonylation reactor; The water separated by the water separator is sent to the water electrolyzer, and the separated hydrogen is recycled; The oxygen obtained by electrolysis of the water electrolyzer is recovered and stored through the liquefier and the liquid oxygen storage tank, and the obtained hydrogen is recycled; Carbon monoxide is introduced into the carbonylation reactor, and the second gas product including pentacarbonyl iron obtained by the reaction is passed through a pyrolyzer and an iron storage tank to complete iron powder recovery and storage; feeding the second solid product including titanium slag obtained in the carbonylation reactor into the die casting device to obtain a titanium slag electrode; With titanium slag electrode as cathode and graphite, precious metal or conductive ceramic as anode, electrolysis is carried out in the molten salt electrolyzer to obtain porous titanium and oxygen. The oxygen is recovered through the liquefier and the liquid oxygen storage tank, and the porous titanium is recovered and stored in the titanium storage tank.

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