[Soda ash knowledge] Daily question (13) 2009.10.16
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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 67 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 ) Short answer question What is cold crystallization?
Cold precipitation crystallization refers to the process of cooling AI to reduce the solubility of ammonium chloride and precipitate and crystallize.
Cooling is a process in which the solubility of ammonium chloride is reduced and crystallization occurs.
The process of cooling ammonia mother liquor I to reduce the solubility of ammonium chloride and precipitate crystallization
The process of cooling AⅠ to reduce the solubility of ammonium chloride and cause it to precipitate and crystallize.
The process of cooling AⅠ to reduce the solubility of ammonium chloride and cause it to precipitate and crystallize.
The process of cooling AI down to crystallize ammonium chloride is called cold crystallization.
The cold AI sent by the water pump goes to the central circulation pipe of the cold crystallizer and circulates the mother liquor from the external cooler to the bottom of the crystallizer, where the distribution rises. The mother liquor of the cold crystallizer is sent to the external cooler by the axial flow pump, exchanges heat with the liquid ammonia in the shell side, then comes out from the upper part of the external cooler, and returns to the crystallizer through the circulating mother liquor collection tank (i.e. square box) and the central circulation tube. This continuous cooling cycle keeps the crystallizer temperature within the specified index (8-12°C). The supersaturation generated during the cooling process disappears in the crystallizer, prompting the formation and growth of ammonium chloride crystal particles. The generated ammonium chloride crystals are taken out from the lower part of the suspension section of the crystallizer, and passed through the thickener (thickening) to the centrifuge to separate the ammonium chloride. The clear liquid in the upper part of the cold crystallizer (called semi-mother liquor II) enters the salting out crystallizer from the overflow port.
Cold crystallization: The process of cooling the AI to reduce the solubility of ammonium chloride and precipitate and crystallize it.
Does it refer to the process of lowering the temperature so that the material that can crystallize reaches the crystallization point, thereby separating it from the solution in which the crystallized material is dissolved? ?
The process of cooling the AI to reduce the solubility of ammonium chloride and precipitate and crystallize it.