[Soda Ash Knowledge] Question of the Day (108) January 19, 2010
Thread Content
Please hide replies; otherwise, no scoring will be given in principle. Edited posts will not be scored. Specific hiding method: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 This month’s question is taken from page 14 of “Question Bank for Technical Workers’ On-the-Job Training – Operators in Soda Ash Production”. Download the e-book version here: http://bbs.hcbbs.com/thread-13140-1-2.htmlShort-answer questions:
1. Why must the amount of water added during the preparation of lime milk far exceed the theoretical amount?
Answer: It’s good to consider the thickness of the lime milk during production. However, if it becomes too thick, its viscosity becomes excessively high, leading to sedimentation that can clog equipment; this also hinders the transportation of the lime milk； On the other hand, a large amount of heat is released during the digestion process, and a large amount of water vapor turns into water vapor and overflows without participating in the digestion reaction, ensuring that the temperature will not be too high.
In production, it’s beneficial to have a somewhat thick lime milk; however, if it becomes too thick, its viscosity becomes excessively high, leading to sedimentation and equipment blockages. This also hinders the transportation of the lime milk； On the other hand, the digestion process releases a large amount of heat; a great deal of water vaporizes into steam, which escapes without participating in the digestion reaction, thus preventing the temperature from becoming too high.
In production, it’s advisable to consider the thickness of the lime milk; however, if it becomes too thick, its viscosity becomes excessively high, leading to sedimentation and eventual blockage of equipment. This also hinders the transportation of the lime milk； On the other hand, a large amount of heat is released during the digestion process, and a great deal of water vaporizes into steam that escapes without participating in the digestion reaction, thus preventing the temperature from becoming too high.
In production, it’s beneficial to have a somewhat thick lime milk; however, if it becomes too thick, its viscosity becomes excessively high, leading to sedimentation and equipment blockages. This also hinders the transportation of the lime milk； On the other hand, a large amount of heat is released during the digestion process, and a large amount of water vapor turns into water vapor and overflows without participating in the digestion reaction, ensuring that the temperature will not be too high.
In production, it’s beneficial to have a somewhat thick lime milk; however, if it becomes too thick, its viscosity becomes excessively high, leading to sedimentation and equipment blockages. This also hinders the transportation of the lime milk； On the other hand, the digestion process releases a large amount of heat; a great deal of water is vaporized into water vapor, which escapes without participating in the digestion reaction, thereby ensuring that the temperature remains consistently high.
In production, it’s good to aim for a somewhat thick lime milk; however, if it becomes too thick, its viscosity becomes excessively high, leading to sedimentation and equipment blockages. This also hinders the transportation of the lime milk； Additionally, the digestion process releases a large amount of heat; a great deal of water is vaporized into water vapor, which escapes without participating in the digestive reaction, thus preventing the temperature from getting too high.
Answer: In production, it is advisable to ensure that the lime milk has an appropriate consistency. However, if it becomes too thick, its viscosity becomes excessively high, leading to sedimentation and eventual blockage of equipment; this also hinders the transportation of the lime milk. On the other hand, the slaking process releases a large amount of heat, and much water vaporizes into steam, which escapes without participating in the slaking reaction; this helps prevent the temperature from rising too high.
1. The fuel ratio should be appropriate to ensure the complete decomposition of calcium carbonate. 2. There must be sufficient decomposition time for calcium carbonate to be almost completely decomposed within the combustion zone. 3. The combustion temperature must not be too low; there should also be adequate air volume to accelerate combustion inside the kiln
In production, it’s beneficial to have the lime milk at a certain thickness; however, if it becomes too thick, its viscosity becomes excessively high, leading to sedimentation and eventual blockage of equipment, which is detrimental to the transportation of lime milk； On the other hand, the digestion process releases a large amount of heat; a great deal of water is vaporized into water vapor, which escapes without participating in the digestive reaction, thus preventing the temperature from becoming too high.
1. It is good to consider the thickness of the lime milk during the production process; however, if it becomes too thick, its viscosity becomes excessively high, leading to sedimentation and eventual blockage of equipment. This also hinders the transportation of the lime milk. During the slaking process, a large amount of heat is released, and substantial amounts of water turn into water vapor that escapes without participating in the slaking reaction, thereby preventing the temperature from rising too high.