[Soda Ash Knowledge] Question of the Day (20), October 23, 2009

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Please hide the replies; no scoring will be given in principle if they are not hidden. 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. The main difference between the combined soda process and the ammonia-soda process lies in... ( ) A. There is a synthetic ammonia plant. B. Ammonium chloride products are produced. C. Mother liquor recycling. 2. In China, the process flow generally adopted for the combined soda ash production process is ( ). A. One carbonation, two ammonia absorptions, one salting-in step, ice machine refrigeration
B. One carbonation, one ammonia absorption, two salting-in steps, ice machine refrigeration
C. One carbonation, two ammonia absorptions, two salting-in steps, ice machine refrigeration
3. The crystallization of ammonium chloride occurs due to the formation of ( ). A. Temperature supersaturation B. Concentration supersaturation 4. To produce large-sized crystals, the supersaturation should be controlled at ( ). A. Unsaturation region B. Metastable region C. Unstable region 5. The purpose of MI ammonia absorption production is to ( ). A. Supplement raw materials B. Increase production C. Ensure product quality