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Method used for applying bromine extraction bittern to sodium carbonate production

A technology of brine and soda ash, which is applied in the direction of chemical instruments and methods, alkali metal chlorides, alkali metal compounds, etc., can solve problems such as unrealized, and achieve the effect of reducing the amount of addition

Inactive Publication Date: 2015-08-19
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because its pH value is between 2 and 4, it contains oxidizing substances such as hypochlorous acid, and the content of impurities such as calcium, magnesium, and sulfate is too high, if purely chemical methods are used to remove impurities such as calcium, magnesium, and sulfate It is uneconomical, so the scheme of directly using bromine brine for pure alkalization salt has not been realized for a long time

Method used

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  • Method used for applying bromine extraction bittern to sodium carbonate production
  • Method used for applying bromine extraction bittern to sodium carbonate production
  • Method used for applying bromine extraction bittern to sodium carbonate production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this example, the various components and indicators in the bromine extraction brine: the pH value is 2.6, the oxide content is 0.95ppm, the calcium ion content is 1006 mg / L, the magnesium ion content is 7749 mg / L, and the sulfate content is 11087 mg / L. L, sodium chloride content 89.8g / L, suspended matter content 23mg / L.

[0032] After the bromine-extracting brine was dried in the solar decomposition tank for 3 days, the pH value increased to 3.1, and the oxide content dropped to 0.80 ppm. After adding 1.1 ppm sodium sulfite, the pH value of the bromine-extracting brine increased to 5.5, and the oxide content was zero. Send this bromine-extracting brine into a sand filter device filled with anthracite, activated carbon and quartz sand, and then into an ultrafiltration device whose membrane material is PVDF. ppm.

[0033] Add 5ppm antiscalant (sodium hydroxyethyl diphosphonate, polyepoxysuccinic acid, phosphonic acid butane-1,2,4 tricarboxylic acid according to the mo...

Embodiment 2

[0037] In this embodiment, the various components and indicators in the bromine-extracting brine: the pH value is 2.8, the oxide content is 1.15ppm, the calcium ion content is 1408 mg / L, the magnesium ion content is 6163 mg / L, and the sulfate content is 11087 mg / L , sodium chloride content 91.5g / L, suspended matter content 18mg / L.

[0038] After the bromine-extracting brine was dried in the solar decomposition tank for 8 days, the pH value increased to 3.3, and the oxide content dropped to 0.51ppm. After adding 0.8ppm sodium sulfite, the pH value of the bromine-extracting brine increased to 5.8, and the oxide content was zero. Send this bromine-extracting brine into a sand filter device filled with modified fiber balls and pebbles, and then into an ultrafiltration device with PS membrane material. The osmotic pressure of the ultrafiltration is 0.36MPa, and the suspended matter content in the filtrate is reduced to 0.11 ppm.

[0039] Add 8ppm antiscalant (polymaleic acid-acryl...

Embodiment 3

[0043] In this embodiment, the various components and indicators in the bromine-extracting brine: the pH value is 2.0, the oxide content is 1.2ppm, the calcium ion content is 952 mg / L, the magnesium ion content is 5684 mg / L, and the sulfate content is 9749 mg / L. L, sodium chloride content 90.2g / L, suspended matter content 10mg / L.

[0044] After the bromine-extracting brine was dried in the solar decomposition tank for 4 days, the pH value increased to 3.1, and the oxide content dropped to 0.77ppm. After adding 1.05ppm sodium sulfite solution, the pH value of the bromine-extracting brine increased to 5.6, and the oxide content was zero. The bromine-extracting brine is sent to a sand filter device filled with emery and fiber balls, and then sent to an ultrafiltration device whose membrane material is stainless steel. The osmotic pressure of the ultrafiltration is 0.5 MPa, and the suspended matter content in the filtrate is reduced to 0.16 ppm.

[0045] Add 5ppm antiscalant (hexa...

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Abstract

The invention provides a method used for applying bromine extraction bittern to sodium carbonate production. The method comprises following steps: pH value of the bromine extraction bittern is adjusted so as to remove oxidizing substances in the bromine extraction bittern, and solid particles are removed via sand filtration so as to obtain a bittern containing no oxidizing substances or solid particles, wherein the pH value of the obtained bittern ranges from 5 to 7; fine particles, colloids, and macromolecular organic compounds are removed via ultrafiltration, and the vast majority of sulfate radicals and the great mass of calcium and magnesium ions are intercepted via nanofiltration; and an obtained refined bittern is delivered into a sodium carbonate production system for salt dissolving. According to the method, sodium chloride in the bromine extraction bittern is used with high efficiency, and cost decreasing and benefit increasing of sodium carbonate production are realized.

Description

technical field [0001] The invention relates to a method for applying bromine-extracting brine to the production of soda ash, in particular to a method for applying the bromine-extracting brine to the production of soda ash after treating the bromine-extracting brine with a combination of physical and chemical methods. technical background [0002] The underground brine resources in the Laizhou Bay area of ​​the Bohai Sea in my country are rich in brine resources, and the content of brine is high. At present, during the utilization of this bromine-containing brine, the bromine is extracted first, and the bromine-extracted brine still contains a large amount of brine, and then it is sun-dried to obtain raw salt. From raw salt to soda ash production system, seawater must first be dissolved to make saturated brine. Because the raw salt itself and the seawater used contain high levels of impurities such as calcium, magnesium, and sulfate, it must be purified to make refined brin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/06C01D7/00
Inventor 迟庆峰张浩波刘建路潘玉强王健张少华张涛
Owner CHINA NAT OFFSHORE OIL CORP
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