Advanced treatment technique for brine

A kind of advanced treatment, brine technology, applied in the direction of alkali metal halide purification, alkali metal chloride and other directions, can solve the problems of large environmental pollution, high operating costs, waste of resources, etc., to reduce environmental pollution, reduce CO2 emissions, save alkali consumption effect

Active Publication Date: 2008-07-09
SHANGHAI CN WATER
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Problems solved by technology

The operating cost of this process is high, the environment...

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  • Advanced treatment technique for brine
  • Advanced treatment technique for brine

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with specific embodiment:

[0026] Brine advanced treatment process, the concentration of NaCl in the brine is greater than 200g / L, Na 2 SO 4 Concentration less than 50g / L, also contains Ca 2+ and Mg 2+ , Ca 2+ , Mg 2+ The concentration of the brine is 1.1-1.8g / L, 0.26-0.31g / L; the brine also contains suspended solids, and the concentration of the suspended solids is 50-500mg / L. The brine is pretreated, that is, NaOH is added to the brine and Na 2 CO 3 , the reaction overalkaline amount of NaOH is 0.1~0.4g / L, NaOH 2 CO 3 The overalkaline amount of the reaction is 0.2~0.6g / L, the reaction is complete, add sodium polyacrylate polymer flocculant and ferric chloride, the amount of polymer flocculant added is 0.5~3mg / L, FeCl 3 The amount of addition is 0-15mg / L, and the precipitate and suspended solids are removed by filtration, so that the Ca in the brine 2+ , Mg 2+ and SS concentration is less ...

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Abstract

The invention discloses a process of advanced treatment of brine, which is characterized by pretreating brine to enable the concentration of Ca2+, Mg2+ and SS to be smaller than 1.0mg/L, then adjusting the pH value of the brine to 5.0-9.0 and filtering by using a filtering unit of nano filter films. In the process of treatment of brine, multivalent ions and Na2SO4 are separated from saline water by employing the nano filter films, wherein the saline water with high concentration of Na2SO4 is used to produce solid NaCl and Na2SO4, and refined brine with low concentration of Na2SO4 is directly supplied for chlor-alkali plants to use. Then Na2SO4 can be recycled as a resource without consuming BaCl2, brine purification systems are saved, and affection of Ba2+ upon ionic membranes is eliminated.

Description

technical field [0001] The invention relates to a brine treatment process. Background technique [0002] Chlor-alkali enterprises at home and abroad now have a huge brine refining system, because its raw materials - solid salt and brine contain Ca 2+ , Mg 2+ , SiO 2 and SO 4 2- and other multivalent ions and solid impurities. In order to meet the requirements of the NaCl electrolysis ion membrane, these multivalent ions and solid impurities need to be removed. Removal of brine Ca 2+ , Mg 2+ , SO 4 2- Mainly by adding NaOH or Ca(OH) 2 、Na 2 CO 3 or CO 2 and BaCl 2 CaCO 3 , Mg(OH) 2 and BaSO 4 , and then run a variety of methods to reduce the SS in brine to below 1mg / L. For every ton of brine to be processed, 5-30kg of NaOH, Na 2 CO 3 and BaCl 2 (depending on the Ca of the original brine 2+ , Mg 2+ and SO 4 2- content), and produce 10-50kg of solid salt mud. The operating cost of this process is high, the environment is polluted, and it is a productio...

Claims

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Application Information

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IPC IPC(8): C01D3/04C01D3/14
Inventor 赵志安丁立平
Owner SHANGHAI CN WATER
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