(1. 山東建筑大學 熱能工程學院，濟南 250101；
2. 鄭州大學 材料科學與工程學院，鄭州 450001)
摘 要: 配硅比和煅白水化活性度是影響硅熱法煉鎂生產(chǎn)效率的顯著因素，現(xiàn)有文獻主要研究這些因素對總體還原過程的影響作用，不能準確反映工藝參數(shù)深層次的影響機理。本工作采用動力學實驗的方法獲得工藝參數(shù)對硅熱法煉鎂化學反應(yīng)動力學的影響規(guī)律，分別建立包含配硅比(MSi)和煅白水化活性度(γ)的化學反應(yīng)動力學模型，與傳熱模型結(jié)合后采用數(shù)值模擬的方法計算還原過程中的實時產(chǎn)鎂速率和最終產(chǎn)鎂量。雖然動力學數(shù)據(jù)表明還原率隨配硅比和煅白水化活性度的增加而升高，但工業(yè)生產(chǎn)過程中并不總是表現(xiàn)出這種規(guī)律，因其還受到傳熱因素制約。當原料和粗鎂價格隨市場波動時，本工作可以指導生產(chǎn)廠家合理調(diào)整相關(guān)工藝參數(shù)。
關(guān)鍵字: 鎂；硅熱法；反應(yīng)動力學；動力學模型；傳熱；數(shù)值模擬
（1. School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China;
2. School of Material Science and Engineering, Zhengzhou University, Zhengzhou 450001, China）
Abstract:Silicon stoichiometry and hydration activity of calcined dolomite are significant determinants of silicothermic magnesium production efficiency. However, current literatures focus on discussing effects of these factors on the whole reduction process, and they can not accurately reflect the deeper influence mechanism. The influences of technical parameters on the detailed kinetic were studied experimentally, and the kinetic models include process parameters were proposed, then these models were combined with heat transfer model to calculate magnesium reduction and generation rate during the production process by using numerical calculation. Although kinetic experiments show that the magnesium reduction increases with silicon stoichiometry and hydration activity of calcined dolomite, the patterns may differ in the industrial production, because the process is also affected by heat transfer. This study can guide manufacturers to adjust technical parameters and reduce the production costs when the prices of raw materials and magnesium fluctuate with the market supply and demand.
Key words: magnesium; silicon thermistor; reaction kinetics; kinetic modeling; heat transfer; numerical simulation
