[Soda ash knowledge] Daily question (18) 2009.10.21
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Please hide the reply. If you do not hide it, you will not be graded in principle. Specific hiding methods: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 Edited posts are not graded. (The title of this issue is taken from page 63 of "Technical Workers Job Training Question Bank - Soda Ash Production Operator". The electronic version of the book is available for download in the soda ash information sharing area. http://bbs.hcbbs.com/thread-13140-1-2.html ) True or False Question 1. The particle size of ammonium chloride salting out crystallization is larger than that of cold crystallization. ( ) 2. The solid-liquid ratio is relatively high, which can reduce the accumulation of supersaturation and increase the crystal size. ( ) 3. The residence time of crystal particles in the crystallizer is long, which is conducive to the growth of crystal particles. ( ) 4. α value refers to the ratio of FNH3 to CO2 concentration in AII. ( ) 5. β value refers to the ratio of FNH3 to NaCl concentration in AI. ( )
1. The particle size of ammonium chloride salting out crystallization is larger than that of cold crystallization. (F) 2. The solid-liquid ratio is relatively high, which can reduce the accumulation of supersaturation and increase the crystal size. (T) 3. The residence time of crystal particles in the crystallizer is long, which is conducive to the growth of crystal particles. (T) 4. The α value refers to the ratio of FNH3 to CO2 concentration in AII. (F) 5. β value refers to the ratio of FNH3 to NaCl concentration in AI. (F)
1. False 2. True 3. True 4. False 5 False
1. True 2. True 3. False 4. False 5. False
My answer is: 1. Wrong ； 2. Yes ； 3. Yes ； 4. Wrong ； 5. Wrong. Calculation books from a long time ago said that the α value is the ratio of FNH3 to CO2 concentration.