Laser-induced Mg production from magnesium oxide using Si-based agents and Si-based agents recycling

Semiconductive silicon is widely used in solar cells, thyristors, and other important application. However, smelting and refining Si from silicon dioxide (SiO 2) still require a large amount of energy, particularly for the reduction of SiO 2 and removal of impurities. In this work, we designed an approach to prepare very fine Si powder from crystalline and/or amorphous SiO 2 through the magnesiothermic reduction of SiO 2 in molten salts. Moreover, the mechanism of reduction below 1273 K was elucidated. The composition of molten salts and the reaction temperature were varied, and their effect on the Si yield was investigated. The yield was lower in the molten NaCl-MgCl 2 molten salt solvent than in LiCl-MgCl 2 , likely because of the Mg 2 Si by-product formation. The higher yield in LiCl-MgCl 2 resulted from the better solubility of Mg in this molten salt and the suppression of Mg 2 Si formation.

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“…Then, SiH 4 reacts with O 2 in the air to form amorphous SiO 2 [Reaction 7], combusting spontaneously even at room temperature. [28][29][30]…”

Section: Characterization and Effects Of Sio 2 Powdersmentioning

confidence: 99%

Magnesiothermic Reduction of Silicon Dioxide to Obtain Fine Silicon Powder in Molten Salt Media: Analysis of Reduction Mechanism

2018

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“…Reaction product in magnesium battery is refined back to pure magnesium by lasers. Using 1kW CO2 laser, we already succeeded in producing15mg/kJ [9] and 20mg/kJ with 4kW semiconductor laser. This means 50kJ is used to get 1g of magnesium.…”

Section: Magnesium Recycling By Lasersmentioning

confidence: 99%

Renewable Energy Cycle with Magnesium and Solar-Energy-Pumped Lasers

Yabe¹,

Suzuki²,

Satoh³

2014

REPQJ

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We report the recent progress of our proposed renewable energy cycle based on magnesium and solar-energypumped laser. The solar energy is used to recycle the used magnesium, MgO, to recover new magnesium and magnesium is used as fuel-cell battery. The batteries for the cell phone, automobiles and others have already been developed and demonstrated. The magnesium of 24kg is proven to drive a car for 500km without charging.

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“…Using 1kW CO2 laser, we already succeeded in producing15mg/kJ [3] and 20mg/kJ with 4kW semiconductor laser. This means 50kJ is used to get 1g of magnesium.…”

Section: Magnesium Recycling By Lasersmentioning

confidence: 99%

Working Prototype of Magnesium Batteries for Cell Phone and Cars and Magnesium Recycling by Lasers for Renewable Energy Cycle

Yabe¹,

Suzuki²,

Satoh³

2014

REPQJ

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Abstract. We report the present status of development of magnesium batteries. Working prototype for cell phone and cars are already prepared and tested. These batteries use film-type magnesium and the efficiency is very high leading to high current and battery becomes very compact. For larger output, it is already demonstrated that the one cell can achieve several tens A(ampere), which is applicable to automobiles, and will reach 100A within a year. For smaller output, it can be compact and can drive a cell phone for one month without charging.

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Laser-induced Mg production from magnesium oxide using Si-based agents and Si-based agents recycling

Abstract: Articles you may be interested inHigh repetition rate laser-induced breakdown spectroscopy using acousto-optically gated detection Rev. Sci. Instrum. 85, 073104 (2014); 10.1063/1.4890337Laser-induced magnesium production from magnesium oxide using reducing agents

Cited by 13 publications

References 28 publications

Magnesiothermic Reduction of Silicon Dioxide to Obtain Fine Silicon Powder in Molten Salt Media: Analysis of Reduction Mechanism

Magnesiothermic Reduction of Silicon Dioxide to Obtain Fine Silicon Powder in Molten Salt Media: Analysis of Reduction Mechanism

Renewable Energy Cycle with Magnesium and Solar-Energy-Pumped Lasers

Working Prototype of Magnesium Batteries for Cell Phone and Cars and Magnesium Recycling by Lasers for Renewable Energy Cycle

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