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Method for removing sulfate ion in bittern or industrial brine

A technology of sulfate ion and industrial brine, applied in water/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. simple effect

Inactive Publication Date: 2009-02-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this law also has the problem of excessive one-time investment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The concentration of sulfate ion in the raw brine of a soda factory in Jiangsu is 18.12 g / L. Sodium polyacrylate is added to the brine as a settling agent in an amount of 3‰ of the total mass of the brine. mud, its addition is 26% of the total volume of bittern, and after rapid stirring, it is placed for 30 minutes and then filtered. The concentration of sulfate ions in the treated bittern is 4.76 grams per liter, and the removal rate reaches 73.73%, which is much better than that of only Effect of calcium chloride on brine treatment.

[0022] It can be seen from the treatment process that the whole operation process is extremely simple and convenient, and only needs a few simple chemical processes of feeding, stirring, settling and filtering. Since the raw material used in the treatment is industrial waste residue such as soda white mud, there is almost no need to invest much money, which avoids the consumption of raw materials for the treatment agent in the process of...

Embodiment 2

[0024] The concentration of sulfate ions in the raw brine of an alkali factory in Tianjin was 13.63 g / L. A sedimentation agent, calcium polyacrylate, was added to the brine in an amount of 0.5‰ of the total mass of the brine. The addition amount is 23% (by volume) of the total volume of the brine, and after rapid stirring, it is placed for 30 minutes and then filtered. The concentration of sulfate ions in the treated brine is 4.52 g / L, and the removal rate is 66.84%.

[0025] The whole operation process is extremely simple and convenient, and only needs several simple chemical processes such as feeding, stirring, settling and filtering. Since the raw materials used for treatment are industrial waste residues such as soda white mud, there is almost no need to invest much money, which avoids the consumption of chemical raw materials for the treatment agent in the process of sulfate radical removal by other methods. Therefore, the treatment cost is only a small amount of raw mater...

Embodiment 3

[0027] The concentration of sulfate ion in the original brine of a certain alkali factory in Guangdong is 10.16 g / L, and the sedimentation agent polyacrylic acid is added to the brine in an amount of 8‰ of the total mass of the brine. The addition amount is 21% of the total volume of the brine, and after rapid stirring, it is placed for 30 minutes and then filtered. The concentration of sulfate ions in the treated brine is 3.60 g / L, and the removal rate reaches 64.6%.

[0028] It can be seen from the treatment process that the whole operation process is extremely simple and convenient, and only needs a few simple chemical processes of feeding, stirring, settling and filtering. Since the raw materials used for treatment are industrial waste residues such as soda white mud, there is almost no need to invest much money, which avoids the consumption of chemical raw materials for the treatment agent in the process of sulfate radical removal by other methods. Therefore, the treatment...

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Abstract

The invention discloses a method for removing the sulfate ions in brine water or industrial briny water. Sedimentation agent which takes up 0.5-8 permillages of the total weight of the brine water or the industrial briny water is added in the brine water or the industrial briny water the SO4<2-> concentration of which is more than 10 grams per liter. The sedimentation agent is stirred up until dissolving. Then, the lime sludge for making soda produced during ammonia soda production process is added and stirred up evenly, the adding amount of which is 20-30 percent of the total volume of the brine water or the industrial briny water. The SO4<2-> in the brine water or the industrial briny water can be removed after being filtrated. The method treats a waste with another waste, greatly reduced the removal cost of the sulfate ions to less than 5 RMB per ton of brine water, has simple technological flow, is convenient to be operated, can protect environment, does not bring secondary pollution to the brine water or the industrial briny water and surrounding environment, ensures that the content of the sulfate ions is reduced by more than sixty percents, and can meet the requirement that the sulfate ions content in the brine water or the industrial briny water is less than 5 grams per liter after being treated.

Description

technical field [0001] The invention relates to a method for removing sulfate ions in brine, in particular to a method for removing sulfate ions in brine or industrial brine in soda ash or chlor-alkali industries. Background technique [0002] In the production of brine and industrial brine, the removal of sulfate ions in brine or brine is a common problem. The sulfate ions mainly come from the original underground brine or industrial brine after seawater concentration, and the sulfate ion content in them is generally above 5 g / L. In the process of producing soda ash or caustic soda using brine and industrial brine, the existence of sulfate ions has a great impact on the production process and product purity. Therefore, the removal of sulfate ions in brine and industrial brine is of great practical value. Judging from the current research status, the more common removal methods are: BaCl 2 method, CaCl 2 method, freezing method, BaCO 3 method, ion exchange method and me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F9/04C02F1/28
Inventor 石林刘青
Owner SOUTH CHINA UNIV OF TECH
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