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
CN104743582BActive Publication Date: 2016-05-18CHINA NAT OFFSHORE OIL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA NAT OFFSHORE OIL CORP
Publication Date
2016-05-18

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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.
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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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