Device and process for preparing salt through ionic membrane salt separation, concentration crystallization and freezing crystallization

Abstract

The invention discloses a device and a process for preparing salt through ionic membrane salt separation, concentration crystallization and freezing crystallization. The device for preparing salt through ionic membrane salt separation, concentration crystallization and freezing crystallization comprises a monovalent ionic membrane salt separation device, a heating and heat exchanging device with a water inlet connected with a concentrated water outlet of the monovalent ionic membrane salt separation device, a concentration crystallization device with a water inlet connected with a water outlet of the heating and heat exchanging device, a special ionic membrane salt concentration device with a water inlet connected with a fresh water outlet of the monovalent ionic membrane salt separation device, a cooling and heat exchanging device with a water inlet connected with a concentrated water outlet of the special ionic membrane salt concentration device as well as a freezing crystallization device with a water inlet connected with a water outlet of the cooling and heat exchanging device. The system recovery rate is increased, the salt separation effect is enhanced, high-purity NaCl crystal salt and mirabilite are obtained according to different qualities, the system is stable and reliable, the operation cost is low, and the investment cost is low.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a device and a process for producing salt by separating salt from concentrated brine, and more specifically, to a device and process for producing salt by ion membrane salt separation, concentration, crystallization, freezing and crystallization. Background technique [0002] The traditional salt production process is to directly transport the concentrated concentrated water to the crystallization system to obtain miscellaneous salt, or to produce different salts through the combination of evaporation crystallization and freezing crystallization, but miscellaneous salt can only be treated as hazardous waste, and it is difficult to guarantee the treatment of concentrated brine To meet the requirements of reuse and zero discharge, and directly produce salt through evaporation crystallization and freezing crystallization without salt separation, the investment is large...

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Problems solved by technology

[0002] The traditional salt production process is to directly transport the concentrated concentrated water to the crystallization system to obtain miscellaneous salt or to produce different salts by combining evaporation crystallization and freezing crystallization, but miscellaneous salt can only be treated as hazardous waste, and it is difficult to guarantee the treatment of concentrated brine To meet the requirements of reuse and zero discharge, and directly produce salt through evaporation crystallization and freezing crystallization without salt separation, the investment is large, the operating cost is high, the recovery rate is low, and the purity of the obtained salt is low

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