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采用氢还原法制备了金属Cr。研究了氢气还原Cr_2O_3及K_2Cr_2O_7的热力学过程,分析了添加剂、氢气流量、反应时间及反应温度等因素对氢还原Cr_2O_3及K_2Cr_2O_7效果的影响,采用XRD对体系反应产物进行分析,计算体系质量损失率来衡量反应结果。结果表明,体系中水分压与氢气分压的比小于10-5时,保持反应温度为1 200℃、恒温3h,控制氢气流量为1L/min并加入1%的Cr为添加剂时,Cr_2O_3及K_2Cr_2O_7均可以被H2还原,K_2Cr_2O_7的还原效果更好。
Metal Cr was prepared by hydrogen reduction method. The thermodynamic process of hydrogen reduction of Cr 2 O 3 and K 2 Cr 7 O 7 was studied. The effects of additives, hydrogen flow rate, reaction time and reaction temperature on the reduction of Cr 2 O 3 and K 2 Cr 2 O 7 were studied. The reaction products were analyzed by XRD to calculate the mass loss rate Measure the response. The results show that when the ratio of the partial pressure of water to the partial pressure of hydrogen is less than 10-5, the reaction temperature is 1 200 ℃, the temperature is kept constant for 3 hours, the flow rate of hydrogen is controlled to 1L / min and 1% Cr is added as additive, Cr_2O_3 and K_2Cr_2O_7 Can be H2 reduction, K_2Cr_2O_7 reduction better.