CAJ | 학술논문

本文对常压及真空条件下以碳化钙为还原剂制取金属镁的热力学分析,计算出平衡状态下镁蒸汽的露点,并进行真空热还原实验研究.结果表明:常压下临界反应温度为2095K;当系统压力降至10~3Pa和10Pa,临界反应温度依次降为1376K和1030K;达到平衡时,还原温度1316K时,镁蒸汽的露点为熔点,还原温度为1273K、1373K时,露点分别为901K、958K.升高还原温度或延长还原时间可提高镁收率和CaC_2利用率;理论配比的反应物料在1423K条件下还原2h的镁收率为83.1%.而当还原时间达到2.5h,镁还原率和CaC_2利用率均超过80%.
본문대상압급진공조건하이탄화개위환원제제취금속미적열역학분석,계산출평형상태하미증기적로점,병진행진공열환원실험연구.결과표명:상압하림계반응온도위2095K;당계통압력강지10~3Pa화10Pa,림계반응온도의차강위1376K화1030K;체도평형시,환원온도1316K시,미증기적로점위용점,환원온도위1273K、1373K시,로점분별위901K、958K.승고환원온도혹연장환원시간가제고미수솔화CaC_2이용솔;이론배비적반응물료재1423K조건하환원2h적미수솔위83.1%.이당환원시간체도2.5h,미환원솔화CaC_2이용솔균초과80%.
The reduction of magnesia with calcium carbide both in atmosphere and in vacuum was experimentally studied and thermodynamically analyzed.The dew-point temperature of the magnesium vapor in the equilibrium state was calculated.The results show that the reaction pressure strongly affects the critical reduction temperature,and that an increase of the reduction temperature or reaction time improves the Mg yield and the CaC_2 efficiency.For instance,at an atmospheric pressure,the critical reduction temperature was found to be 2095K;as the pressure decreased to 10~3Pa and 10Pa,the critical temperature dropped to 1376K and 1030K,with the dew-point temperatures of 901K and 958K,respectively.In the experimental thermal-vacuum reduction of Mg from calcined dolomite by calcium carbide with the theoretical ratio of the reactants,at 1424K for 2h,the Mg yield were 83.1%;and a reaction time of 2.5h resulted in over 80% of both Mg yield and CaC_2 efficiency.