[Soda Ash Knowledge] Question of the Day (21) October 24, 2009

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Please hide replies; those not hidden will, in principle, not be graded. Specific hiding method: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 Edited posts are not rated. (The topic of this issue is taken from page 64 of “Question Bank for On-the-Job Training of Skilled Workers – 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) Multiple-choice questions: 1. At ( ) °C, the solubilities of ammonium chloride and sodium chloride are equal. A. 14 B. 15 C. 16 2. Compared to the particle size of cold-induced crystallization, the particle size of salt-induced crystallization is ( ). A. Smaller B. The same C. Larger 3. The yield of salting out crystallization is compared with that of cold crystallization ( ). A. Less B. The same C. Greater 4. What is the relationship between the amount of ammonium chloride precipitated and temperature in a salting-out crystallizer? ( ) A. The higher the temperature, the greater the amount of precipitation.
B. Temperature has little effect; it is only related to the amount of salt added.
C. The lower the temperature, the greater the amount of precipitation.
5. In the production of combined soda, what does the value α refer to? A、FNH3/CO2 B、CNH3/CO2 C、TNH3/CO2