Novel Method to Prepare Magnesium by Aluminothermic Reduction of Magnesia and Calcium Hydroxide at Normal Atmosphere, 1223 K (950 °C)

Zhang, Teng; Du, Shuangming; Sun, Wan‐chang; Zhang, Jumei; Niu, Li-Bin; Zheng, Bin; Xia, Hua

doi:10.1007/s11663-016-0821-8

Cited by 8 publications

(5 citation statements)

References 23 publications

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“…It was reported that high-energy ball milling could increase the mechanical energy storage of reactants and thus decrease reaction temperature [40,41]. Recently, our results also demonstrate that ball milling could lower the reduction temperature of MgO by using Al metal as a reducing agent, with ball mill speed and time of 600 r/min and 5 h, respectively [22,23]. Therefore, in this article, the reactants are treated by a high-energy ball milling process with ball mill speed and time of 600 r/min and 5 h, respectively, in order to ensure that the reduction of magnesium oxide is carried out at 1273 K.…”

Section: Thermodynamic Analysis Of the Reduction Reactionsupporting

confidence: 71%

“…Nevertheless, it is interesting to see that M reduced by Al metal when the temperature is higher than 1500 K at normal pressu was reported that high-energy ball milling could increase the mechanical energy st of reactants and thus decrease reaction temperature [40,41]. Recently, our result demonstrate that ball milling could lower the reduction temperature of MgO by usi metal as a reducing agent, with ball mill speed and time of 600 r/min and 5 h, respec [22,23]. Therefore, in this article, the reactants are treated by a high-energy ball m process with ball mill speed and time of 600 r/min and 5 h, respectively, in order to e that the reduction of magnesium oxide is carried out at 1273 K. 2 High temperature sealant, 3 graphite flake, 4 sample, 5 Ceramic lid, 6 graphite paper, 7 alumina crucible, 8 Activated carbon powders, 9 ceramic cup.…”

Section: Thermodynamic Analysis Of the Reduction Reactionmentioning

confidence: 55%

“…Compared with the reducing agents ferrosilicon alloy and carbon, aluminum metal has stronger reducing power. Thus, lots of valuable research works have been focused on the reduction of MgO using the vacuum aluminothermic reduction method with a vacuum pressure of less than 20 pa [19][20][21][22][23]. Nevertheless, this method has some drawbacks; one is that the reduction process is performed under the lower vacuum pressure condition.…”

Section: Introductionmentioning

confidence: 99%

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Novel Approach to Prepare Magnesium and Mg-Al Alloy from Magnesia by Using the Closed Microwave Aluminothermic Method

Zhang

Wang

Niu

et al. 2023

Metals

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Herein, we report a novel approach to obtaining magnesium and nanocrystal Mg-Al alloy from magnesia using a closed microwave aluminothermic method in order to solve the problems of high energy consumption, high pollution, and low productivity in the process of magnesium and its alloy production. The main idea of the paper is to design a technique for the preparation of magnesium–aluminum alloy during the reduction process of MgO directly under atmospheric pressure. Based on this experimental idea, we have established a closed microwave aluminothermic reduction reactor. The great advantage of the reaction device is that it can make the reaction material heat up quickly to the reaction temperature in the microwave heating process and produce high-pressure magnesium vapor, which reacts with aluminum dramatically to form Mg-Al alloy under microwave irradiation. By the calculation of the electromagnetic field of the reaction device and sample using ANSYS electronics desktop 2018, the optimum microwave heating conditions for samples have been established. Based on the calculation results, we demonstrate that magnesium and its alloy are prepared successfully by using this method. In addition, the reduction rate of MgO is greatly improved, which is higher up to 79.97 Wt% when the reduction time is 30 min, at 1273 K, and the Mg2Al3 and MgAl alloy is formed during the reduction process as well. Moreover, the formation mechanism of Mg-Al alloy during the reduction process under microwave irradiation was discussed further. Our findings could provide a new approach, insights, and research directions to obtain magnesium and Mg-Al alloy directly from magnesia under normal pressure.

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Section: Thermodynamic Analysis Of the Reduction Reactionsupporting

confidence: 71%

Section: Thermodynamic Analysis Of the Reduction Reactionmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Novel Approach to Prepare Magnesium and Mg-Al Alloy from Magnesia by Using the Closed Microwave Aluminothermic Method

Zhang

Wang

Niu

et al. 2023

Metals

Self Cite

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“…The CFD model is validated by comparing the simulation results with experimental data. To make the parameters of the desulfurization model more compatible with the final desulfurization outcomes, they were changed and optimized by comparison with the findings of literature data [43][44][45][46][47]. The ladle processing conditions such as slag thickness of 0.1 mm and molten steel height of 28.9mm have been considered for validation.…”

Section: Validation and Verification Of The Numerical Resultsmentioning

confidence: 99%

Numerical simulation of the dolomite in-situ desulfurization in molten iron

Shen

Yu²,

Zhang³

et al. 2023

Mater. Res. Express

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With the growing need for high-quality steel, the requirement for efficient deep desulfurization technologies is growing, and lots of research have be conducted. The desulfurization in hot iron with Mg produced in situ by the aluminothermic reduction of decomposed dolomite was simulated. The magnesium generated at the molten matte-slag interface is dissolved in the molten iron and desulfurizing while spread downwards The process has been studied by experiment and computational fluid dynamics simulation. Some analysis and assumptions were made for the simulation conditions and the simulated data are in good agreement with the experimental results. The rate of desulfurization depended mainly on the reaction rate and is almost independent of the rate of diffusion of Al、S and Mg according to the results. Under the present experimental conditions, the desulfurization rate increased with the increase in temperature and the amount of reactants. However, the effect is not obvious when the temperature is higher than 1623K. The adjustment in diffusion coefficient has minimal influence on the desulfurization efficiency. The desulfurization reaction is mainly in the homogeneous phase, and the proportion of magnesium bubble desulfurization could be ignored when the temperature is higher than 1523K.

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“…Teng Zhang et al [75] subjected a mixture of MgO:Al:Ca(OH) 2 with a molar ratio of 3:2:1 to aluminothermic reduction at atmospheric pressure and temperature of 1223 K. It was concluded that high-energy ball milling can strengthen the aluminothermic reduction mixture of magnesium oxide and calcium hydroxide and successfully prepare high purity magnesium crystals. The particle size of magnesium powder increased with the increase in ball milling time and decreased with the increase in sodium stearate content.…”

Section: Aluminothermic Methodsmentioning

confidence: 99%

Research on the Process, Energy Consumption and Carbon Emissions of Different Magnesium Refining Processes

Zhang

2023

Materials

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Under the policy of low carbon energy saving, higher requirements are put forward for magnesium smelting. As the mainstream magnesium smelting process, the Pidgeon process has the disadvantages of a long production cycle, high energy consumption and high carbon emission, which makes it difficult to meet the requirements of green environmental protection. This paper reviews the research progress on different magnesium smelting processes and further analyzes their energy consumption and carbon emissions. It is concluded that the standard coal required for the production of tons of magnesium using the relative vacuum continuous magnesium refining process is reduced by more than 1.5 t, the carbon emission is reduced by more than 10 t and the reduction cycle is shortened by more than 9.5 h. The process has the advantages of being clean, efficient and low-carbon, which provides a new way for the development of the magnesium industry.

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Novel Method to Prepare Magnesium by Aluminothermic Reduction of Magnesia and Calcium Hydroxide at Normal Atmosphere, 1223 K (950 °C)

Cited by 8 publications

References 23 publications

Novel Approach to Prepare Magnesium and Mg-Al Alloy from Magnesia by Using the Closed Microwave Aluminothermic Method

Novel Approach to Prepare Magnesium and Mg-Al Alloy from Magnesia by Using the Closed Microwave Aluminothermic Method

Numerical simulation of the dolomite in-situ desulfurization in molten iron

Research on the Process, Energy Consumption and Carbon Emissions of Different Magnesium Refining Processes

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