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1.为了研究搅拌强度对对RE2(CO3)3浸出过程的影响，控制碳铵的用量为理论用量的1.5倍，反应温度为50℃，反应时间为7h，搅拌强度分别为30、50、70、90、110r/min，浸出结果如图3所示。 2.由图3可以看出，当搅拌速度小于70r/min时，RE2(CO3)3的浸出率随着搅拌速度的增加而快速增加；当搅拌速度大于70r/min时，RE2(CO3)3的浸出率基本不随搅拌速度的增加而变化，搅拌速度对浸出率已无影响。这说明已经消除了液膜扩散对反应的影响，搅拌作为一个变量可以被忽略。然而扩散作为反应速率控制步骤是不能被消除的[3]，所以此时反应进入了动力学区，浸出过程只可能受化学反应控制(式(6))、固膜内扩散控制(式(7))或二者的混合控制(式(8))。 |
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小甲009(金币+40,VIP+0):thanks 1-22 18:06
小甲009(金币+40,VIP+0):thanks 1-22 18:06
| 1. In order to study the influence of the agitation level to the leaching process of RE2 (CO3) 3 , the optimal ammonium bicarbonate concentration actually should be controlled 1.5 times than theoretical, the reaction temperature is 50 ℃, reaction time is 7h, the agitation level respectively is 30,50,70 , 90,110 r / min, extraction results shown in Figure 3. |
2楼2010-01-21 21:56:24
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2. As is seen in the picture 3, when the stirring speed is less than 70r/min, the leaching rate of RE2 (CO3) 3 increases with the stirring speed increases; while when the stirring speed is greater than 70r/min, the leaching rate of RE2 (CO3) 3 hardly increases with the change in stirring speed, stirring speed on leaching rate is no longer affected. Which shows that the Diffusion of Liquid Film on the reaction have already eliminated , stirring as a variable can be ignored. However, Diffusion as a reaction rate-determining step can not be eliminated [3], hence the reaction zone step into the dynamics, the leaching process can only be controlled by the chemical reaction (Eq. (6)), the Diffusion of solid membrane (Eq. (7) ), or a mixture of both(Eq. (8)). |
3楼2010-01-21 22:30:58
ysm56789
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小甲009(金币+20,VIP+0):thanks 1-22 18:07
小甲009(金币+20,VIP+0):thanks 1-22 18:07
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In order to test the effect of agitation intensity on lixiviation of RE(CO3)3, the quantity of teschemacherite should be 1.5 times higher than theoretical level; the reaction temperature is 50℃; reaction time is 7hr; the intensities of agitation are 30,50,70 , 90,110 r / min respectively. All results were shown in figure 3. As shown in figure 3, the ratio of lixiviation of RE2(CO3)3 was increased with the increasing speed of agitation while the agitation speed was less than 70r/min; the results that no difference on lixiviation was found while the agitation speed is over 70r/min confirmed that the agitation was no longer a factor for lixiviation. Therefore we can ignore the effect of agitation by eliminating the solution film diffusion on reaction. However, it cannot be eliminated as a speed control process of reaction [3], so at the time of the reaction enter the zone of dynamics, the process of lixiviation was controlled by chemical reaction (Eq. (6)), diffusion of solid membrane (Eq. (7) ), or combination of both (Eq. (8)). 这是我的翻译，希望对你有帮助！ [ Last edited by ysm56789 on 2010-1-22 at 08:23 ] |
4楼2010-01-22 05:16:27