氢气还原钨酸锌的标准生成吉布斯自由能变计算及实例  

Standard Generation of Gibbs Free Energy Calculation and Instance of the Reaction of H_2 Reducing ZnWO_4

作　　者：邓登飞[1] 黄泽辉 赵立夫 张立[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083 [2]崇义章源钨业股份有限公司,江西崇义341300

出　　处：《中国钨业》2016年第5期40-45,共6页China Tungsten Industry

摘　　要：针对人工计算标准生成吉布斯自由能变比较复杂且工作量大等问题,采用MATLAB软件对氢气还原钨酸锌反应进行了ΔrGθT计算和绘图,获得了该反应的标准生成吉布斯自由能变,并通过该软件获得了一次拟合函数式。通过拟合函数可知,该反应为吸热反应,升高温度有利于反应的进行。在不同的温度下获得了氢气还原钨酸锌的产物,结果表明:还原温度为700℃时,反应未完全,产物的XRD表明还有钨酸锌存在;当反应温度为900℃时,反应已经完全,产物的XRD分析为钨粉,同时通过SEM观察该钨粉为超细粉末;当反应温度为1 100℃时,获得亦是钨粉,但该粉末晶粒之间的桥连现象比较多。由试验可知,该反应能够进行且为吸热反应,证实了MATLAB软件计算、拟合出的函数与实际相符,论证了该方法的科学性。To solve the heavy-workload in the artificial calculation of the standard generation of Gibbs free energy,the author used the MATLAB to calculate and draw the standard generation of Gibbs free energy on the reaction of the H2 reduction ZnWO4.The reaction of the standard Gibbs free is obtained.The results show that the temperature for the endothermic reaction is beneficial.The results showed that the reaction was not complete when the temperature was 700 ℃,because the XRD of the product showed that there existed ZnWO4; when the reaction temperature was 900 ℃ the reaction was complete,because the XRD analysis of the products was tungsten powder and the SEM observation of the products was the Ultrafine tungsten powder; when the reaction temperature was 1 100 ℃,the products also was tungsten powder,and the powder grain bridging phenomenon was much more than the reaction temperature was 900 ℃.From the above experiments,it was known that the reaction could be carried out and it was endothermic reaction,which confirmed with the MATLAB calculation and fitting results.

关 键 词：MATLAB 钨酸锌 还原 标准生成吉布斯自由能 吸热反应 超细钨粉 

分 类 号：TF841.1[冶金工程—有色金属冶金] O642[理学—物理化学]