煅白热容的理论计算及试验测定
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摘要
硅热法炼镁的主要原料是煅烧白云石(简称煅白),煅白的性质会对镁还原过程产生很大影响。本文首先通过两种理论计算的方法分别得到煅白的热容为0.83J/(℃·g)和0.77J/(℃·g),再采用差示扫描量热法(DSC法),以刚玉为标准物质测定了煅白从常温至700℃的热容数据,并通过回归分析得到了常温至700℃热容与温度的关系式,试验结果与理论计算值基本一致。
Calcined dolomite is the main raw materials of magnesium production by Silicon thermal process. The properties of calcined dolomite have a significant impact on magnesium reduction process. By two kinds of theoretical calculation,The heat capacities of calcined dolomite are obtained,which are respectively 0. 83 J/( ℃ ·g) and 0. 77 J/( ℃ ·g),then by using the Differential Scanning Calorimetry( DSC),the thermal capacity data of calcined dolomite from room temperature to 700℃ were measured by corundum as standard materials. And the relationship between heat capacities and temperature from 25℃ to 700℃ were obtained by regression analysis. The experimental results are basically in agreement with the theoretical calculation values.
Calcined dolomite is the main raw materials of magnesium production by Silicon thermal process. The properties of calcined dolomite have a significant impact on magnesium reduction process. By two kinds of theoretical calculation,The heat capacities of calcined dolomite are obtained,which are respectively 0. 83 J/( ℃ ·g) and 0. 77 J/( ℃ ·g),then by using the Differential Scanning Calorimetry( DSC),the thermal capacity data of calcined dolomite from room temperature to 700℃ were measured by corundum as standard materials. And the relationship between heat capacities and temperature from 25℃ to 700℃ were obtained by regression analysis. The experimental results are basically in agreement with the theoretical calculation values.
引文
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[2]杨重愚.轻金属冶金学[M].北京:冶金工业出版社,1991.
[3]徐日瑶.硅热法炼镁理论与实践[M].长沙:中南工业大学出版社,2002.
[4]高峰,聂祚仁,王志宏.中国皮江法炼镁的资源消耗和环境影响分析[J].中国有色金属学报,2006(8):1456-1461.
[5]陈亚凡,李力.硅热法炼镁还原罐子系统能耗的研究[J].宁夏:宁夏大学学报,2005,26(4):322-324.
[6]梁磊.硅热法炼镁在球团加热过程中的传热及温度分布[J].轻金属,2006(10):58-61.
[7]田阳,王昱超,杨成博等.真空碳热还原煅白制取金属镁的工艺[J].中国有色金属学报,2013(8):2296-2301.
[8]DAVID R.LIDE.Handbook of Chemistry and Physics[M].Unite State of American:CRC Press,84th Edition,2004.
[9]李大成,周大利,刘恒.热力学计算在海绵钛冶金中的应用[M].北京:冶金工业出版社,2009,3:16.
[10]赵定国,郭培民,赵沛.金属间化合物的比热容估算模型[J].北京:北京科技大学学报,2010(5):565-569.
[11]XU Y,CHUNG D D L.Effect of sand addition on the specific heat and thermal conductivity of cement[J].Cement and Con-crete Research,2000,30(1):59-61.
[12]XU Y,CHUNG D D L.Cement-based materials improved by surface-treated admixtures[J].ACI Materials Journal,2000,97(3):333-342.
[13]RODUR V K R,SULTAN M A.Effect of temperature on thermal properties of high-strength concrete[J].Journal of Materials in Civil Engineering,2003,15(2):101-107.