A New Mixed Slurry Circulating Crystallizer and Its Application
A crystallizer and circulation technology, applied in the direction of solution crystallization, carbonate preparation, etc., can solve the problems of large land occupation, large investment, troublesome operation, etc., and achieve the effect of high volume coefficient, low investment and convenient operation
Active Publication Date: 2011-12-21
DALIAN RES & DESIGN INST OF CHEM IND
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[0006] The purpose of the present invention is to provide a new type of mixed slurry circulating crystallizer to solve the problems of large-scale production, large investment, troublesome operation, etc.
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[0032] See attached Figure 5 , the crystallization process of ammonium chloride in the joint soda industry adopts a two-stage crystallization system of cold analysis and salting out, and its process includes the following steps:
[0033](a) Cold crystallization: the ammonia mother liquor I sent by the joint alkali-making process is blended with the outlet of the external cooler 5, and then enters the bowl-shaped crystallization suspension section from the central tube 6 of the cold crystallizer 3 from top to bottom through the bottom of the ball After the supersaturation gradually disappears on the crystal surface of the suspension section, it rises to the crystallization separation section. After the mother liquor is clarified, it is sent to the external cooler 5 by the cold analysis axial flow pump 4, and the temperature is lowered by evaporative cooling of liquid ammonia, and then sent back by the central tube 6. Cold crystallizer circulation;
[0034] (b) Salt-out crysta...
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Abstract
The invention provides a slurry circular-type crystallizer. A crystallizer main body consists of a bowl-shaped crystallization suspension section and a straight cylindrical crystallization separation section, wherein the bowl-shaped crystallization suspension section is uniformly amplified from bottom to top, and the upper part of the bowl-shaped crystallization suspension section is connected with the straight cylindrical crystallization separation section. An angle between an oblique edge of the bowl-shaped crystallization suspension section and a horizontal plane is not smaller than 55 DEG, and the height of the crystallizer is not more than 11m. The bowl-shaped crystallization suspension section is used for substituting a conventional structure consisting of a conical transitional section, a straight section and a ball bottom, so under the situation that the height and the volume of the crystallizer is less increased, a large-scale crystallizer can be designed. The invention also provides application of the slurry circular-type crystallizer which is used as a low-temperature crystallizer and a salting-out crystallizer during the ammonium chloride crystallization process in thejoint alkaline manufacturing industry. Compared with the traditional crystallizer, under the same production scale, the size of the crystallizer is small, and the volume coefficient is large, so the current state that multiple systems are required during the ammonium chloride crystallization process of the large-sized joint alkali manufacturing industry can be changed, the supporting pipelines and the control instruments can be reduced, and the investment can be reduced.
Description
Technical field [0001] The invention relates to a crystallizer in chemical production, in particular to a novel mixed-pulp circulating crystallizer and its application in the crystallization process of ammonium chloride in a large-scale combined soda plant. Background technique [0002] Crystallization is an important chemical process and one of the main means of substance purification. The types of crystallizers can be divided according to the method of obtaining the supersaturated state of the solution: evaporative crystallizer and cooling crystallizer; according to the flow mode, it can be divided into graded circulation crystallizer and mixed slurry circulation crystallizer; according to the operation mode, it can be divided into continuous crystallizer and batch crystallizer. [0003] The crystallizer commonly used in the crystallization process of combined alkali-making ammonium chloride is Oslo (Oslo) continuous crystallizer. The body of the standard Oslo crystalliz...
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IPC IPC(8): B01D9/02C01D7/18
Inventor 朱长城徐晓辉窦进良郜长水
Owner DALIAN RES & DESIGN INST OF CHEM IND