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Method for extracting bromine from potassium extraction old brine and producing sodium bromide

A technology of sodium bromide and old halogen, applied in the direction of alkali metal bromide, chemical industry, improvement of process efficiency, etc., to avoid storage and transportation safety problems and environmental pollution risks, avoid pH increase, and the effect of simple process

Pending Publication Date: 2022-08-09
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as far as the old brine for extracting potassium from rock salt mines is concerned, after the extraction of bromine resources, it needs to be solidified and backfilled. Due to the limitation of the backfill process, the old brine after bromine extraction must be neutral.

Method used

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  • Method for extracting bromine from potassium extraction old brine and producing sodium bromide
  • Method for extracting bromine from potassium extraction old brine and producing sodium bromide
  • Method for extracting bromine from potassium extraction old brine and producing sodium bromide

Examples

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Effect test

Embodiment 1

[0049] Adopt the above-mentioned method provided by the invention to extract bromine and prepare sodium bromide from the old brine containing bromine and potassium, and its brine composition and concentration are:

[0050]

[0051] The specific experimental process is as follows:

[0052] (1) the anode chamber of ion-exchange membrane two-chamber electrolysis device is passed into the old halogen containing bromine and potassium, and the anode material in the described anode chamber is a graphite electrode; The resin adsorption effluent is passed into the cathode chamber, and the negative electrode in the described cathode chamber is passed into the cathode chamber. The material is platinum metal electrode; at 40A / m 2 In the constant current mode, a direct current is passed through the two-chamber electrolysis device of the ion exchange membrane, and the bromine ion undergoes an electrolysis reaction at the anode to generate elemental bromine;

[0053] (2) pass the pretrea...

Embodiment 2

[0059] Adopt the above-mentioned method provided by the invention to extract bromine and prepare sodium bromide from the old brine containing bromine and potassium, and its brine composition and concentration are:

[0060]

[0061] The specific experimental process is as follows:

[0062] (1) the anode chamber of ion-exchange membrane two-chamber electrolysis device is passed into the old halogen containing bromine and potassium, and the anode material in the described anode chamber is a graphite electrode; The resin adsorption effluent is passed into the cathode chamber, and the negative electrode in the described cathode chamber is passed into the cathode chamber. The material is platinum metal electrode; at 50A / m 2 In the constant current mode, a direct current is passed through the two-chamber electrolysis device of the ion exchange membrane, and the bromine ion undergoes an electrolysis reaction at the anode to generate elemental bromine;

[0063] (2) pass the pretrea...

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Abstract

The invention provides a method for extracting bromine from potassium extraction old brine and producing sodium bromide, which comprises the following steps of: introducing the potassium extraction old brine into an anode chamber of an electrolysis device, introducing resin adsorption effluent into a cathode chamber, and reacting through direct current and bromine ions in a constant current mode to generate elemental bromine; enabling the potassium extraction old brine in the anode chamber to pass through anion exchange resin, enabling the bromine simple substance to be adsorbed on the resin to form bromine-loaded resin, and enabling the potassium extraction old brine to pass through the resin to obtain resin adsorption effluent; introducing a reducing agent into the bromine-loaded resin, reducing the bromine simple substance adsorbed on the bromine-loaded resin into bromine ions, and adding sodium hydroxide to react to obtain a mixed solution of sodium sulfate and sodium bromide; and performing quality-divided crystallization on the mixed solution to obtain a sodium sulfate solid and a sodium bromide product. According to the method, the storage and transportation safety problem and the environmental pollution risk caused by traditional chlorine oxidation are avoided, meanwhile, the old brine obtained after bromine extraction is converted to be neutral, and the influence on the curing and backfilling process is reduced.

Description

technical field [0001] The invention belongs to the technical field of bromine extraction from inorganic chemical old brine, and in particular relates to a method for extracting bromine from potassium extraction old brine and producing sodium bromide. Background technique [0002] Sodium bromide is an inorganic compound, which is colorless cubic crystal or white granular powder, odorless, salty and slightly bitter, widely used in photosensitive industry, pharmaceutical industry, perfume industry, printing and dyeing industry, etc. It can also be used in Manufacture of bromide, organic synthesis, photographic paper, etc. [0003] At present, the method that sodium hydroxide absorbs bromine is generally adopted in industry, or the method that utilizes hydrobromic acid and sodium hydroxide to neutralize produces sodium bromide, and the above two methods all produce impurity sodium bromate. For example, bromine is generally used in industry to react with sodium hydroxide hot so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/24C25B1/50C01D3/10
CPCC25B1/24C25B1/50C01D3/10Y02P20/10
Inventor 杨颖苏晨昱宋兴福于建国
Owner EAST CHINA UNIV OF SCI & TECH
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