Single-effect four-body MVR (mechanical vapor recompression) saline wastewater separation device and separation method thereof

A separation device and salt mixing technology, applied in chemical instruments and methods, water/sewage treatment, multi-stage water treatment, etc., can solve the problems of high energy consumption, energy waste, large volume flow, etc. Heat exchange area and effect of operating energy consumption, cost reduction and operational energy consumption, flow reduction and performance requirements

Pending Publication Date: 2017-09-15
GUANGZHOU SCHIN TECH IND CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the desalination treatment of this kind of wastewater, there are usually the following treatment technologies: One is to obtain mixed salt by direct evaporation and crystallization. This technology is simple in process, but its economic value is not high.
The second is the multi-effect vacuum evaporation process of salt and nitrate co-production. This technology uses the solubility relationship between sodium chloride and sodium sulfate to obtain salt (sodium chloride) at high temperature and nitrate (sodium sulfate) at low temperature, so that higher purity salt can be obtained products and nitrate products, but the fi

Method used

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  • Single-effect four-body MVR (mechanical vapor recompression) saline wastewater separation device and separation method thereof
  • Single-effect four-body MVR (mechanical vapor recompression) saline wastewater separation device and separation method thereof

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Experimental program
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Embodiment 1

[0033] Such as figure 1 As shown, the secondary steam outlets of the pre-concentration evaporator, salt evaporation crystallizer, nitric acid evaporation crystallizer, and miscellaneous salt evaporation crystallizer are connected to the inlet of the same effect steam compressor, and the outlets of the steam compressor are respectively connected to the pre-concentration evaporator, Heating steam inlet of salt evaporation crystallizer, nitric acid evaporation crystallizer, miscellaneous salt evaporation crystallizer.

Embodiment 2

[0035] Such as figure 2 As shown, the secondary steam outlets of the pre-concentration evaporator, salt evaporation crystallizer, nitric acid evaporation crystallizer, and miscellaneous salt evaporation crystallizer are connected to the inlet of the same effect steam compressor, and the outlets of the steam compressor are respectively connected to the pre-concentration evaporator, The heating steam inlet of the salt evaporation crystallizer, the nitric acid evaporation crystallizer and the inlet of the second steam compressor, the outlet of the second steam compressor is connected with the heating steam inlet of the miscellaneous salt evaporation crystallizer.

[0036] The specific implementation method of the one-effect four-body MVR mixed salt wastewater separation method using the above separation device is as follows.

[0037] 1. Mixed salt wastewater passes through the nanofiltration membrane to obtain sodium chloride-rich product water and sodium sulfate-rich concentra...

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PUM

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Abstract

The invention discloses a single-effect four-body MVR (mechanical vapor recompression) saline wastewater separation device, comprising a pre-concentration evaporator, a salt evaporation crystallizer, a nitrate evaporation crystallizer, an incidental salt evaporation crystallizer and a steam compressor, wherein secondary steam outlets of the pre-concentration evaporator, the salt evaporation crystallizer, the nitrate evaporation crystallizer and the incidental salt evaporation crystallizer are connected to an inlet of the same steam compressor, and inlet steam temperature of the steam compressor is 80-100 DEG C. The invention also discloses a saline wastewater separation method using the device. The device has zero emission of saline wastewater, can isolate and recycle high-purity salt and anhydrous nitrate from the wastewater, and has low investment cost and operational energy consumption.

Description

technical field [0001] The invention belongs to the field of chemical wastewater treatment, and in particular relates to a one-effect four-body MVR mixed-salt wastewater separation device and a separation method. Background technique [0002] Some enterprises in the fields of salt chemical industry, coal chemical industry, hydrometallurgy, and pharmaceuticals will produce a large amount of high-concentration mixed-salt wastewater containing sodium chloride, sodium sulfate, and other salts. For the desalination treatment of this kind of wastewater, there are usually the following treatment technologies: One is to obtain mixed salt by direct evaporation and crystallization. This technology is simple in process, but its economic value is not high. The second is the multi-effect vacuum evaporation process of salt and nitrate co-production. This technology uses the solubility relationship between sodium chloride and sodium sulfate to obtain salt (sodium chloride) at high temperat...

Claims

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Application Information

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IPC IPC(8): C02F9/10
CPCC02F9/00C02F2301/08C02F1/442C02F1/04C02F1/041
Inventor 姜广义区瑞锟
Owner GUANGZHOU SCHIN TECH IND CO LTD
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