Ammonia distillation device and technology by mother liquor and total ash powder with alkaline method

Abstract

The invention relates to an ammonia distillation device and technology, in particular to an ammonia distillation device and technology by mother liquor and total ash powder with an alkaline method. According to the device and the technology, a bottom end outlet of a second flash tank is connected with a second layout pipeline which is directly connected with a waste liquor charging pump; the preheated mother liquor and lime powder are blended in proportion, sent to a preliming barrel, stirred and mixed and react in the preliming barrel, and ammonia formed by the reaction is sent out from the top end of the preliming barrel and used for other procedures after cooling treatment; and a reaction liquid of the preliming barrel flows into a fixed ammonia distillation column and is in countercurrent contact for heat exchange with steam entering from the lower part, and ammonia in a liquid phase is distilled, output from the top of the distillation column and used for other procedures after cooling treatment. Compared with the prior art, lime milk is not used, total ash powder distillation operation is achieved truly, surplus lime is controlled, lime milk flow is not needed to regulate, besides, heat utilization of quick lime slaking is sufficient, and the capacity of the distillation column is increased.

Description

[0001] technical field [0002] The invention relates to an ammonia distillation device and a process, in particular to an ammonia distillation device and a process for ammonia-alkali method mother liquor whole ash powder ammonia distillation. Background technique [0003] Ammonia-soda method is one of the main methods for the manufacture of synthetic soda ash. In the process of distilling ammonia from mother liquor in the production process, the process operation methods adopted are divided into two categories. One is steaming ammonia from gray milk, that is, the mother liquor is pre-distilled to remove part of free ammonia and CO 2 Afterwards, metathesis reaction is carried out with the milk of lime obtained by digesting quicklime, and the combined ammonia in the mother liquor is converted into free ammonia, which is driven out by steam heating for recovery. The other is steaming ammonia from ashes, that is, the mother liquor is pre-distilled to remove part of free ammonia...

AI Technical Summary

Problems solved by technology

[0005]① still need to use part of lime milk, can not make full use of quicklime digestion reaction heat; The processing capacity of the distillation tower is improved; ③The sand discharge process is easy to cause fluctuations in the tower conditions, and there is also a potential safety hazard that the high-temperature ammonia-containing sand liquid is easy to splash and overflow and hurt people; Disadvantages of waiting more

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