[Soda Ash Knowledge] Daily Question (17) 10/20/2009
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Please hide replies; otherwise, no scoring will be given in principle. Specific hiding method: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 Edited posts are not rated. (The topic for this issue is taken from page 63 of “Question Bank for Technical Workers’ On-the-Job Training – Operators in Soda Ash Production”. The electronic version of this book can be downloaded from the Soda Ash Information Sharing Section: http://bbs.hcbbs.com/thread-13140-1-2.html.) True or False: 1. The process of adding salt to cause ammonium chloride to crystallize out is called salting-out crystallization. ( ) 2. In order to add more salt, the temperature control for salting-out crystallization is about 5 degrees higher than that for cooling crystallization. ( ) 3. The amount of ammonium chloride produced in the salting-out crystallizer is influenced by temperature and the amount of salt added. ( ) 4. To ensure the quality of the final product, the sodium chloride concentration in the MII is controlled to be 2–3 tt lower than the saturation level. ( ) 5. The process of crystallization in a solution can be divided into three stages: the formation of supersaturation, the generation of crystal nuclei, and the growth of crystal nuclei. ( )
1. The process of adding salt to cause ammonium chloride to crystallize out is called salting-out crystallization. (Correct) 2. In order to add more salt, the temperature control for salting-out crystallization is about 5 degrees higher than that for cooling crystallization. (Incorrect) 3. The amount of ammonium chloride produced in a salting-out crystallizer is influenced by temperature and the amount of salt added. (Correct) 4. To ensure the quality of the final product, the sodium chloride concentration in the MII is controlled at a level 2–3 tt lower than the saturation point. (Correct) 5. The process of crystallization in a solution can be divided into three stages: the formation of supersaturation, the generation of crystal nuclei, and the growth of crystal nuclei. (Correct)
1. The process of adding salt to cause ammonium chloride to crystallize out is called salting-out crystallization. (Correct) 2. In order to add more salt, the temperature control for salting-out crystallization is about 5 degrees higher than that for cooling crystallization. (Wrong) 3. The amount of ammonium chloride output in the salting out crystallizer is affected by the temperature and the amount of salt added. (Correct) 4. To ensure the quality of the final product, the sodium chloride concentration in the MII is controlled to be 2–3 tt lower than the saturation level. (Correct) 5. The process of crystallization from a solution can be divided into three stages: the formation of supersaturation, the generation of crystal nuclei, and the growth of crystal nuclei. (Yes)
1. Correct 2. Incorrect 3. Correct 4. Correct 5. Correct
1. The process of adding salt to cause ammonium chloride to crystallize out is called salting-out crystallization. (Correct) 2. In order to add more salt, the temperature control for salting-out crystallization is about 5 degrees higher than that for cooling crystallization. (Incorrect) 3. The amount of ammonium chloride produced in a salting-out crystallizer is influenced by temperature and the amount of salt added. (Correct) 4. To ensure the quality of the final product, the sodium chloride concentration in the MII is controlled at a level 2–3 tt lower than the saturation point. (Correct) 5. The process of crystallization in a solution can be divided into three stages: the formation of supersaturation, the generation of crystal nuclei, and the growth of crystal nuclei. (Correct) 1# chen3jun