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A kind of brine purification device and method for removing strontium element from mirabilite brine

A brine purification and brine technology, applied in the direction of alkali metal halide purification, etc., can solve the problem of reducing the content of strontium element in liquid salts to 0.1ppm and below.

Active Publication Date: 2017-10-31
CHINASALT JINTAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When dealing with Glauber's salt-type strontium-containing brine, the current method of adding soda ash cannot reduce the content of strontium in liquid salt to 0.1ppm or below

Method used

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  • A kind of brine purification device and method for removing strontium element from mirabilite brine

Examples

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Effect test

Embodiment 1

[0017] Take the purified 1L Glauber's salt brine with a sodium chloride content of 305g / L, a sodium sulfate content of 12g / L, and a calcium sulfate content of 2.0g / L as an example. Reaction barrel, add calcium chloride 0.8g / L in the first reaction barrel, filter after stirring for 1 hour, send the clarified liquid into the second reaction barrel, add soda ash 1.1g / L in the second reaction barrel, add caustic soda 0.3g / L, titration method to determine the over-alkali content of soda ash is 0.25g / L, stirring and reacting for 2 hours, the solution or suspension after the reaction is directly sent to the membrane device, and the permeate is passed through acid adjustment and residual chlorine removal process After being sent to the nanofiltration process, the solution on the permeate side is treated with a chelating ion exchange resin device to obtain a refined brine clarified liquid, which is measured by an inductively coupled plasma spectrometer. index.

Embodiment 2

[0019] Take the purified 1L Glauber's salt brine with a content of 225g / L sodium chloride, 18g / L sodium sulfate and 1.5g / L calcium sulfate as an example. The original brine of Glauber's salt is sent to the first Reaction barrel, add calcium chloride 1.2g / L in the first reaction barrel, filter after stirring for 1 hour, send the clarified liquid into the second reaction barrel, add soda ash 1.45g / L in the second reaction barrel, add caustic soda 0.3g / L, the excess alkalinity of soda ash determined by titration method is 0.30g / L, stirred and reacted for 2 hours, the solution or suspension after the reaction is directly sent to the membrane device, and the permeate is passed through acid adjustment and residual chlorine removal process After being sent to the nanofiltration process, the solution on the permeate side is treated with a chelating ion exchange resin device to obtain a refined brine clarified liquid, which is measured by an inductively coupled plasma spectrometer. ind...

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Abstract

The invention relates to a brine purification device for removing the strontium element from sodium sulfate type brine, and the device comprises sedimentation devices such as a reaction barrel, a membrane separator and an ion exchange device. The method for removing the strontium element from the sodium sulfate type brine by using the device comprises the steps that ionic impurities such as most calcium, magnesium and strontium in liquid salt are removed by the sedimentation devices, small calcium and magnesium ions in the sodium sulfate type brine are removed by the membrane separator, and the ion exchange device can effectively remove trace of strontium ions in the liquid salt. The content of the strontium ions in the liquid salt treated deeply by the device can be reduced to be or lower than 0.1 ppm.

Description

technical field [0001] The invention relates to a brine purification device and method for removing strontium elements from mirabilite brine. Background technique [0002] Compared with the production of the same amount of solid salt, the energy consumption of liquid salt production can save 100kg standard coal / ton of salt, and liquid salt is widely used in chlor-alkali production enterprises. Liquid salt is a relatively cheap raw material for the production of chlorine and caustic soda. The ionic membrane used in the chlor-alkali production process has very high requirements for the feed liquid salt. Taking the Japanese Asahi Kasei ionic membrane’s requirements for liquid salt impurities as an example, the content of strontium element should be lower than 0.1ppm. Excessive strontium impurities will cause the cell voltage to rise , so that the production efficiency of chlor-alkali is reduced, and the life of the ionic membrane is shortened. Therefore, the removal of stront...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/14
CPCC01D3/14
Inventor 蒋璨姚金华刘凯陈留平李文华赵营峰
Owner CHINASALT JINTAN
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