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Method for extracting metal and preparing oxygen from lunar soil/lunar rock mixed oxides

A mixed oxide, metal extraction technology, used in the field of metallurgy

Active Publication Date: 2014-03-19
NORTHEASTERN UNIV LIAONING
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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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  • Method for extracting metal and preparing oxygen from lunar soil/lunar rock mixed oxides

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 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.

[0030] (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;

[0031] The resulting Al-Si-Fe alloy contains 90% by weight of Al, 8% of Si, 1% of Fe, and the balance is impurities;

[0032] (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 ...

Embodiment 2

[0036] 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.

[0037] (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;

[0038] The resulting Al-Si-Fe alloy contains 86% by weight of Al, 9% of Si, 4% of Fe, and the balance is impurities;

[0039] (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-b...

Embodiment 3

[0043] 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.

[0044] (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;

[0045] The resulting Al-Si-Fe alloy contains 86% by weight of Al, 9% of Si, 4% of Fe, and the balance is impurities;

[0046] (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...

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Abstract

The invention belongs to the field of metallurgy, and particularly relates to a method for extracting metal and preparing oxygen from lunar soil / lunar rock mixed oxides. The method comprises the following steps: carrying out aluminothermic reduction on lunar soil / lunar rock mixed oxides at 940-2200 DEG C for 2-6 hours by using metal aluminum as a reducer, carrying out slag-metal separation to obtain an Al-Si-Fe alloy and Al2O3-rich mixed oxides, dissolving the Al2O3-rich mixed oxides in a cryolite-base fused salt electrolyte Na3AlF6-AlF3, and carrying out electrolysis at 930-985 DEG C by using a Fe-Ni alloy and a Fe-Ni-Al2O3 metal-base composite material as an anode while controlling the current density in the electrolysis process at 0.4-1.2A / cm<2>, thereby bubbling oxygen at the anode and obtaining metal aluminum at the cathode. According to the method, the mixed oxides containing SiO2, Al2O3, Fe2O3, MgO, CaO and Na2O are subjected to aluminothermic reduction at high temperature, and the electrolysis is performed by using the inert anode to prepare the metal aluminum and oxygen; and thus, the method can be used in industrial practice to implement green metallurgy and clean production with zero carbon consumption and zero greenhouse gas emission, and has important meanings for establishing lunar bases and front base stations in 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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Patent Type & Authority Applications(China)
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 LIAONING
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