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首页> 外文期刊>Journal of Magnesium and Alloys >The silicothermic reduction of magnesium in flowing argon and numerical simulation of novel technology
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The silicothermic reduction of magnesium in flowing argon and numerical simulation of novel technology

机译：新技术流动氩气及数值模拟中的硅温降低及数值模拟

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The silicothermic reduction of magnesium was investigated by the non-isothermal thermoanalysis in flowing argon, while the traditional investigations of silicothermic process for magnesium reduction were carried out under vacuum conditions. Firstly, the thermal gravimetric (TG) and derivative thermogravimetric (DTG) characteristic of briquettes prepared with calcined dolomite, ferrosilicon and fluorite were characterized by the thermogravimetric analyzer (TGA) at different heating rates. The intrinsic chemical kinetic mechanism was identified as a formal chemical reaction with the Nth order type which showed apparent activation energyEand reaction ordernwere 290.168?kJ mol?1and 1.076, respectively. Then, a novel technique of magnesium production without vacuum was put forward and a three-dimensional unsteady numerical model incorporating the chemical reaction, radiation, heat conduction and heat convection was established and simulated, which was verified by Pidgeon process and novel technology. The numerical results showed that the cycle time of the novel technique could be reduced when the argon temperature was higher than 1343?K and the argon entrance velocity was over 0.05?m s?1. And the effect of the argon temperature on reduction degree was much larger than that of entrance velocity.
机译：通过流动的氩气中的非等温热囊分析研究了镁的丝温还原，而在真空条件下进行了对镁氧化镁的传统调查。首先，用煅烧的白云石，硅铁和萤石制备的膨胀物的热重量（Tg）和衍生物热重度（DTG）的特征在于不同的加热速率的热重分析仪（TGA）以热量分析仪（TGA）为特征。本质化学动力学机理被鉴定为与第n个阶型的正式化学反应，其表现出明显的活化能量反应统一盎司290.168？kjmol？1,1.076。然后，提出了一种没有真空的镁生产技术，并建立并模拟包含化学反应，辐射，导热和热对流的三维不稳定数值模型，并通过Pidgeon工艺和新技术验证。数值结果表明，当氩气温度高于1343Ω·k时，可以减小新技术的循环时间，并且氩入口速度超过0.05？m s？1。并且氩气温度对降低程度的影响远大于入射速度。

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