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1实验方法 实验采用恒温水浴加热、电动搅拌器搅拌，在2000 mL三颈烧瓶中进行。将NH4HCO3和NH3•H2O溶液加热到规定温度后，加入RE2(SO4)3，反应结束后过滤、洗涤，并测定RE2(CO3)3的量，从而计算出稀土的浸出率。 2此反应为液固反应。因反应过程中有不溶物RE2(CO3)3生成，且生成物附着在未反应核之外，因此可选择有固相生成的未反应核模型进行描述。此外，在反应过程中，颗粒总体积的变化情况与反应物、产物的密度及化学计量系数有关。通过测量可以得知RE2(SO4)3的密度为5.28 g/cm3，RE2(CO3)3的密度为5.83 g/cm3，由此可以计算反应前后相应的粒径变化之比为0.90。可见，反应前后半径的变化很小，故在反应过程中，可将反应物的总体半径变化忽略，颗粒半径可以近似地按常数处理，因此最终选择粒径不变的收缩未反应核模型。 |
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小甲009(金币+70,VIP+0):thanks 1-22 18:08
小甲009(金币+70,VIP+0):thanks 1-22 18:08
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1实验方法 实验采用恒温水浴加热、电动搅拌器搅拌，在2000 mL三颈烧瓶中进行。将NH4HCO3和NH3•H2O溶液加热到规定温度后，加入RE2(SO4)3，反应结束后过滤、洗涤，并测定RE2(CO3)3的量，从而计算出稀土的浸出率。 1. Experimental The experiment was performed in the 2000 ml three-necked flask which was water-bath heated at constant temperature accompanied by stirring with an electric mixer. Heat the solution of NH4HCO3 and NH3•H2O into regulated temperature, then add the RE2(SO4)3. After the reaction completed, filter and rinse the solution. Then measure the concentration of RE2(CO3)3 and through it calculate the leaching rate of rare earth. |
2楼2010-01-21 21:56:54
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2此反应为液固反应。因反应过程中有不溶物RE2(CO3)3生成，且生成物附着在未反应核之外，因此可选择有固相生成的未反应核模型进行描述。此外，在反应过程中，颗粒总体积的变化情况与反应物、产物的密度及化学计量系数有关。通过测量可以得知RE2(SO4)3的密度为5.28 g/cm3，RE2(CO3)3的密度为5.83 g/cm3，由此可以计算反应前后相应的粒径变化之比为0.90。可见，反应前后半径的变化很小，故在反应过程中，可将反应物的总体半径变化忽略，颗粒半径可以近似地按常数处理，因此最终选择粒径不变的收缩未反应核模型。 2. The reaction is the liquid-solid one. As the insoluble RE2(CO3)3 generates during the process of reaction and the products adhere to the non-reacted nucli, the model of non-reacted nucli with solid phase products can therefore be chosen to describe the reaction. Additionally, the variation of the total volume of the grains is associated with the density of the reactants and products and the stoichiometric coefficients. The density of RE2(SO4)3 and RE2(CO3)3 was measured to be 5.28 g/cm3 and 5.83 g/cm3, respectively. Based on the data, the corresponding ratio of the grain size before reaction to those after reaction can be calculated to be 0.90. It is seen that the variation of grain size is very small, so the whole variation of grain size can be neglected and taken as constant approximately. So, at last the model of contracted non-reacted nucli with constant grain size was adopted. |
3楼2010-01-21 22:18:50