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A method and device for producing refined brine using bromine-extracting brine

A technology for refining brine and brine, which is applied in the purification of alkali metal halides, etc., can solve the problems of high dependence on weather conditions, large floor space, and large manpower consumption, so as to realize waste utilization, reduce refining costs, and avoid leakage loss effect

Active Publication Date: 2016-05-18
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this traditional utilization method is highly dependent on weather conditions, occupies a large area, consumes a lot of manpower, and is inefficient

Method used

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  • A method and device for producing refined brine using bromine-extracting brine
  • A method and device for producing refined brine using bromine-extracting brine
  • A method and device for producing refined brine using bromine-extracting brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In this example, the various components and indicators in the bromine-extracting brine: the pH value is 2.67, the oxide content is 1.95 ppm, the calcium ion content is 1120 mg / L, the magnesium ion content is 5562 mg / L, and the sulfate content is 11087 mg / L.

[0046] refer to figure 1 , the above-mentioned brine is sent into the pH value adjustment bucket, and the salt mud with a solid content of 9.95% is added therein, and the addition amount is 0.353g / L bromine-extracting brine in equivalent dry basis. After reacting for 20min, the pH value of the bromine-extracting brine is adjusted to 5.52, the overflow liquid from the upper part of the pH adjustment tank was clarified by the clarification tank, and the turbidity was 7.65NTU. After being filtered by the sand filter device filled with quartz sand and activated carbon, the turbidity was reduced to 2.87NTU, and the membrane material was PVDF ultrafiltration. After the device is filtered, the turbidity drops to 0.93NTU. ...

Embodiment 2

[0049] In this example, the various components and indicators in the bromine-extracting brine: the pH value is 2.78, the oxide content is 0.69 ppm, the calcium ion content is 950 mg / L, the magnesium ion content is 5250 mg / L, and the sulfate content is 10206 mg / L.

[0050] Put the above-mentioned brine into the pH adjustment bucket, add salt mud with a solid content of 9.91% to it, and add 0.426g / L bromine brine in equivalent dry basis, and adjust the pH value of the bromine brine to 7.10 after reacting for 16 minutes , After the overflow from the upper part of the pH value adjustment tank is clarified by the clarification tank, the turbidity is 8.59NTU. After being filtered by the screen type self-cleaning filter device, the turbidity is reduced to 2.69NTU. After being filtered by the ultrafiltration device whose membrane material is stainless steel, The turbidity dropped to 0.90NTU.

[0051] Add 2.80ppm of sodium bisulfite to the ultrafiltration product water, and completely ...

Embodiment 3

[0053] In this example, various components and indicators in the bromine-extracting brine: the pH value is 2.30, the oxide content is 3.20 ppm, the calcium ion content is 1000 mg / L, the magnesium ion content is 5100 mg / L, and the sulfate content is 9486 mg / L.

[0054] Put the above-mentioned brine into the pH adjustment bucket, add salt mud with a solid content of 9.95% to it, and add 0.301g / L bromine brine in equivalent dry basis, and adjust the pH value of the bromine brine to 5.22 after reacting for 20 minutes , After the overflow liquid from the upper part of the pH value adjustment barrel is clarified by the clarifier, the turbidity is 6.25NTU, and after being filtered by the sand filter device filled with pebbles, quartz sand and anthracite, the turbidity is reduced to 2.11NTU, and the membrane material is ceramic ultra-thin After filtering by the filter device, the turbidity dropped to 0.68NTU.

[0055] Add 15.57ppm of sodium bisulfite to the ultrafiltration product wat...

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Abstract

The invention discloses a method and a device for producing refined brine by utilizing bromine extraction brine. The method comprises the following steps: adjusting the pH value of the bromine extraction brine to 5-8, intercepting solid particles and mechanical impurities through mechanical microfiltration, adding a reducing agent to remove oxidized substances, carrying out ultrafiltration to remove small particles, colloids and macromolecular organic compounds, then, removing most of sulphate radicals and calcium and magnesium ions through nanofiltration interception so as to obtain brine dissolved raw salt, preparing the brine dissolved raw salt into saturated brine, further refining to remove the calcium and magnesium ions by adopting a chemical method so as to obtain refined brine and brine sludge, and returning the brine sludge back to the first step to adjust the pH value of the bromine extraction brine. By means of the method disclosed by the invention, high-efficiency utilization of sodium chloride in the bromine extraction brine is realized; the sun-curing and dissolving processes of a part of sodium chloride are saved; the leakage loss of underground salt brine resources in the salt basking process is avoided; the recovery rate of raw salt in the bromine extraction brine is increased; furthermore, the brine refining cost of a sodium carbonate factory is lowered, so that the production cost is lowered.

Description

technical field [0001] The invention relates to a method and a device for producing refined brine by using bromine-extracting brine, in particular to a method and a device for producing refined brine for soda ash and chlor-alkali production by using bromine-extracting brine. technical background [0002] Saturated brine is used in the production of soda ash and chlor-alkali, and it must be strictly refined to remove impurities such as calcium and magnesium ions. For example, the total content of calcium and magnesium ions in the brine entering the soda ash production system must be controlled within 20ppm. The requirements for removal of calcium and magnesium ions in brine are higher. Usually, the chemical methods for refining brine include ammonium carbonate method, lime-ammonium carbonate method, lime-soda ash method, lime Glauber's salt method and caustic soda-soda ash method. Using the above chemical methods can control the total content of calcium and magnesium ions in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/14
Inventor 刘建路迟庆峰张浩波王健孟凡祥王宗瑞陈晓宇
Owner CHINA NAT OFFSHORE OIL CORP
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