Salt-nitrate continuous separation method

A separation method, a technology of salt nitrate, applied in chemical instruments and methods, alkali metal sulfite/sulfite, alkali metal sulfite/sulfate purification, etc., can solve problems such as high energy consumption and long process flow

Inactive Publication Date: 2019-11-05
BEIJING HORIZON ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of high energy consumption and long process flow in the salt industry and the treatment of chemical wastewater containing sodium chloride and sodium sulfate, the present invention provides a method for separating salt and nitrate with low energy consumption and simple process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] The mass concentrations of sodium chloride and sodium sulfate in the raw brine were detected, which were 27.1% and 2% respectively.

[0107] A1. Introduce 10m3 raw materials into the salt evaporative crystallizer EV-01, evaporate and crystallize sodium chloride at 100°C, and when the mass concentration of sodium sulfate in the solution in the salt evaporative crystallizer EV-01 is 4.25%, mother liquor 1 is formed. Take out the crystallized sodium chloride, centrifuge to obtain sodium chloride, and use GB / T13025.5-2012 method to detect the purity of sodium chloride ≧98.5%.

[0108] A2. Transfer the mother liquor 1 into the nitrate evaporation crystallization tank EV-02, then transfer it to the heat exchanger through the pump A, and transfer it to the salt evaporation crystallization tank EV-03 after heat exchange and cooling; evaporate and crystallize sodium chloride at 50°C, When the mass concentration of sodium sulfate in the salt evaporation crystallization tank EV-03...

Embodiment 2

[0116] 1) Detect the mass concentrations of sodium chloride and sodium sulfate in the raw brine, which are 27.1% and 2% respectively.

[0117] A1, the 10m 3 The raw material is introduced into the salt evaporative crystallizer EV-01, and sodium sulfate is evaporated and crystallized at 100°C. When the mass concentration of sodium sulfate in the solution in the salt evaporative crystallizer EV-01 is 4.4%, mother liquor 1 is formed. The crystallized sodium chloride was taken out and centrifuged to obtain sodium chloride. The purity of sodium chloride is detected by GB / T13025.5-2012 method ≧98.5%.

[0118] A2. Transfer the mother liquor 1 into the nitrate evaporation crystallization tank EV-02, then transfer it to the heat exchanger through the pump A, and transfer it to the salt evaporation crystallization tank EV-03 after heat exchange and cooling; evaporate and crystallize sodium chloride at 50°C, When the mass concentration of sodium sulfate in the salt evaporation crystall...

Embodiment 3

[0126] 1) Detect the mass concentrations of sodium chloride and sodium sulfate in the raw brine, which are 26.1% and 3% respectively.

[0127] A1, the 10m 3 The raw material is introduced into the salt evaporative crystallizer EV-01, and sodium sulfate is evaporated and crystallized at 100°C. When the mass concentration of sodium sulfate in the solution in the salt evaporative crystallizer EV-01 is 4.1%, mother liquor 1 is formed. The crystallized sodium chloride was taken out and centrifuged to obtain sodium chloride. The purity of sodium chloride is detected by GB / T13025.5-2012 method ≧98.5%.

[0128] A2. Transfer the mother liquor 1 into the nitrate evaporation crystallization tank EV-02, then transfer it to the heat exchanger through the pump A, and transfer it to the salt evaporation crystallization tank EV-03 after heat exchange and cooling; evaporate and crystallize sodium chloride at 50°C, When the mass concentration of sodium sulfate in the salt evaporation crystall...

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Abstract

A salt-nitrate separation method comprises the steps that the salt-nitrate concentration in a raw material is detected; if the salt-nitrate concentration ratio is larger than or equal to the co-saturation concentration ratio of salt and nitrate at a first temperature and the concentration of the salt is higher than the co-saturation concentration of the salt at the first temperature, A1, the raw material is introduced into a salt evaporation crystallizer to crystallize at the first temperature, and when the concentration of the nitrate is in the range from the co-saturation concentration of -0.5% of the nitrate at the first temperature to the co-saturation concentration of the nitrate at the temperature, a mother liquor 1 is formed; A2, the mother liquor 1 is transferred into a salt evaporation crystallization tank to crystallize at a second temperature, and when the concentration of the nitrate is in the range from the co-saturation concentration of -0.5% of the nitrate at the secondtemperature to the co-saturation concentration of the nitrate at the temperature, a mother liquor 2 is formed; A3, the mother liquor 2 is transferred into a nitrate evaporation crystallization tank tocrystallize at the first temperature, and when the concentration of the salt in a nitrate evaporation crystallizer is in the range from the co-saturation concentration of -0.5% of the salt at the first temperature to the co-saturation concentration of the salt at the temperature, a mother liquor 3 is formed; A4, the mother liquor 3 is transferred into the salt evaporation crystallization tank tocrystallize at the second temperature to form a mother liquor 2; step A3 and step A4 are repeated.

Description

technical field [0001] The invention relates to a method for continuous separation of salt and nitrate. Background technique [0002] Well mine salt in most areas of my country is associated with Glauber's salt, and Glauber's salt is associated with sodium chloride. In the separation of salt and nitrate, due to the needs of environmental protection, the salt and nitrate separation technology capable of multi-effect flash evaporation is usually used. However, this multi-effect flash salt and nitrate separation technology has low steam utilization rate, long process line and high energy consumption. [0003] In addition, the separation of sodium chloride and sodium sulfate is often involved in the treatment of chemical wastewater. Similarly, the existing technology for treating wastewater containing sodium chloride and sodium sulfate usually adopts the salt and nitrate separation technology of multi-effect flash evaporation. Contents of the invention [0004] In order to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/24C01D3/06C01D3/14C01D5/16C01D5/00
CPCC01D3/06C01D3/14C01D3/24C01D5/004C01D5/16
Inventor 郝明生
Owner BEIJING HORIZON ENVIRONMENTAL TECH
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