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A method for extracting metals and preparing oxygen from lunar rock-type mixed oxides

A technology for mixing oxides and extracting metals, applied in the field of metallurgy, can solve the problems of not reaching the purity of industrial aluminum ingots and difficult to use raw materials

Active Publication Date: 2016-06-22
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the Fe-Ni-based inert anode used in aluminum electrolysis can obtain aluminum purity of only 95-98%, which cannot reach the purity of industrial aluminum ingots, and it is difficult to use it as a raw material in industry.

Method used

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  • A method for extracting metals and preparing oxygen from lunar rock-type mixed oxides
  • A method for extracting metals and preparing oxygen from lunar rock-type mixed oxides

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this example, the composition content (mass percentage) of lunar rock-type mixed oxides in lunar soil is as follows: 20% SiO 2 , 60%Al 2 o 3 , 0%FeO, 1%Fe 2 o 3 , 4%MgO, 15%CaO.

[0029] (1) Under the condition of isolated air, metal aluminum is used as the reducing agent, and the amount of metal aluminum is twice the molar amount of the theoretical reducing agent required for the reduction of lunar soil and lunar rock-type mixed oxides. The oxide was subjected to aluminothermic reduction for 2 hours, and then slag-gold separation was performed to obtain Al-Si-Fe alloy and Al-rich 2 o 3 mixed oxides;

[0030] The obtained Al-Si-Fe alloy contains Al90%, Si8%, Fe1% by weight percentage, and the balance is impurities;

[0031] (2) will be rich in Al 2 o 3 Mixed oxides dissolved in cryolite-based molten salt electrolyte Na 3 AlF 6 -AlF 3 Medium, rich Al 2 o 3 The amount of mixed oxide added is Al-rich 2 o 3 5% of the total weight of mixed oxide and cryoli...

Embodiment 2

[0035]In this embodiment, the composition content (mass percentage) of lunar rock-type mixed oxides in lunar soil is as follows: 30% SiO 2 , 40%Al 2 o 3 , 10%FeO, 3%Fe 2 o 3 , 2%MgO, 15%CaO.

[0036] (1) Under the condition of isolated air, metal aluminum is used as the reducing agent, and the amount of metal aluminum is 3 times the molar amount of the theoretical reducing agent required for the reduction of lunar soil and lunar rock-type mixed oxides. The oxide was subjected to aluminothermic reduction for 3h, followed by slag-gold separation to obtain Al-Si-Fe alloy and Al-rich 2 o 3 mixed oxides;

[0037] The obtained Al-Si-Fe alloy contains Al86%, Si9%, Fe4% by weight percentage, and the balance is impurities;

[0038] (2) will be rich in Al 2 o 3 Mixed oxides dissolved in cryolite-based molten salt electrolyte Na 3 AlF 6 -AlF 3 Medium, rich Al 2 o 3 The amount of mixed oxide added is Al-rich 2 o 3 4% of the total weight of mixed oxide and cryolite-based mo...

Embodiment 3

[0042] In this example, the composition content (mass percentage) of lunar rock-type mixed oxides in lunar soil is as follows: 40% SiO 2 , 30%Al 2 o 3 , 5%FeO, 8%Fe 2 o 3 , 2%MgO, 15%CaO.

[0043] (1) Under the condition of isolated air, metal aluminum is used as the reducing agent, and the amount of metal aluminum is 4 times the molar amount of the theoretical reducing agent required for the reduction of lunar soil and lunar rock-type mixed oxides. The oxide was subjected to aluminothermic reduction for 4h, followed by slag-gold separation to obtain Al-Si-Fe alloy and Al-rich 2 o 3 mixed oxides;

[0044] The obtained Al-Si-Fe alloy contains Al86%, Si9%, Fe4% by weight percentage, and the balance is impurities;

[0045] (2) will be rich in Al 2 o 3 Mixed oxides dissolved in cryolite-based molten salt electrolyte Na 3 AlF 6 -AlF 3 Medium, rich Al 2 o 3 The amount of mixed oxide added is Al-rich 2 o 3 6% of the total weight of mixed oxide and cryolite-based molte...

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Abstract

The invention belongs to the field of metallurgy, and particularly relates to a method for extracting metals and preparing oxygen from lunar regolith-type mixed oxides. The method of the present invention uses metal aluminum as a reducing agent to perform thermite reduction of lunar regolith-type mixed oxide at 940-2200°C for 2 to 6 hours, and then separates slag and gold to obtain Al-Si-Fe alloy and Al2O3-rich Mixed oxide, dissolve Al2O3-rich mixed oxide in cryolite-based molten salt electrolyte Na3AlF6-AlF3, use Fe-Ni alloy, Fe-Ni-Al2O3 metal matrix composite material as the anode, conduct electrolysis at 930-985°C, control During the electrolysis process, the current density is 0.4-1.2A / cm2, oxygen is precipitated at the anode, and metallic aluminum is obtained at the cathode. The invention is to reduce the mixed oxide containing SiO2, Al2O3, Fe2O3, MgO, CaO and Na2O at high temperature, and then use an inert anode to electrolyze to prepare metal aluminum and oxygen. It can not only be applied to industrial practice, but also achieve zero carbon Green metallurgy and clean production with zero consumption and zero greenhouse gas emissions are also of great significance to the establishment of lunar bases and cutting-edge base stations in the future.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for extracting metals and preparing oxygen from lunar rock-type mixed oxides. Background technique [0002] With the further development of human space exploration activities, metals and oxygen are needed to establish lunar bases and frontier base stations. my country's lunar exploration project is expected to sample and return before 2020, realize manned moon landing and build a deep space observation station around 2030 -- , At that time, infrastructure raw materials will be needed. If the raw materials needed on the lunar surface, such as aluminum, silicon, titanium, iron, etc., are transported from the earth, the shipping cost per kilogram will be about 200,000 US dollars. If the moon or Mars resources can be used to manufacture metal and oxygen in situ, Si can be used as solar panels, Fe and Al can be used as structural materials, Ca, Mg, etc. can be used as e...

Claims

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Application Information

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IPC IPC(8): C25C3/06C22B5/04C22C21/02C25B1/02
Inventor 石忠宁刘爱民何文才胡宪伟高炳亮王兆文徐君莉于江玉
Owner NORTHEASTERN UNIV
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