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Mixed waste salt recovery process

A salt recovery and process technology, applied in the direction of alkali metal compounds, alkali metal sulfite/sulfite, alkali metal chloride, etc., can solve the problems of organic residues and affecting the purity of salt compound products, so as to improve the purity, Uniform heating and improved removal efficiency

Inactive Publication Date: 2021-06-11
江苏固环环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned related technologies, the inventor believes that only by incineration to remove organic matter, it is easy to cause a lot of organic matter residues, which affects the purity of salt compound products

Method used

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Embodiment 1

[0049] The embodiment of the present application discloses a mixed waste salt recovery process.

[0050] Such as figure 1 Shown, a kind of mixed waste salt recovery process, comprises sequential steps successively:

[0051] This application takes the recovery of potassium salt as an example, wherein the mixed salt organic waste liquid is an acidic solution.

[0052] S1: Acid-base neutralization, add the mixed salt organic waste liquid into the homogeneous mixing tank and mix evenly, then add the mixed salt organic waste liquid into the neutralization reaction tank, add potassium hydroxide into the neutralization reaction tank, and finally And the pH of the solution in the reaction tank is adjusted to be 7, and the neutralized waste liquid is obtained. If the mixed salt organic waste salt becomes alkaline, add sulfuric acid into the neutralization reaction tank.

[0053] S2: Drying and dehydration: Detect the concentration of the neutralization solution, the concentration is...

Embodiment 2

[0060] Such as figure 2 As shown, the difference between embodiment 2 and embodiment 1 is that in step S2, the concentration of the neutralization solution is detected, and the concentration is between 10-15wt%, and the high-concentration neutralization waste liquid is directly sent to the thin layer for drying Dry in a container. The drying heat source comes from the heat-conducting oil furnace in the factory area, and the thin-layer dryer is in a negative pressure environment. The waste gas generated is condensed through the condenser, the condensed water is pumped to the sewage station of the factory area for treatment, and the non-condensable gas is sent to the secondary combustion chamber for incineration.

Embodiment 3

[0062] Such as image 3 As shown, the difference between embodiment 3 and embodiment 1 is that: in step S2, the concentration of the neutralization solution is detected, the concentration is between 5-10wt%, and the middle concentration neutralization waste liquid is added to the three-effect evaporator , and then the dope obtained by three-effect evaporation is sent to a thin-layer drier for drying. The drying heat source comes from the heat-conducting oil furnace in the factory area, and the thin-layer dryer is in a negative pressure environment. The waste gas generated is condensed through the condenser, the condensed water is pumped to the sewage station of the factory area for treatment, and the non-condensable gas is sent to the secondary combustion chamber for incineration.

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Abstract

The invention relates to a mixed waste salt recovery process. The process sequentially comprises the steps of S1, carrying out acid-base neutralization; S2, drying and dehydrating; S3, removing organic matters; and S4, carrying out salt mixing and salt separation. The step S3 comprises the steps of S3-1, carrying out firing treatment on the waste salt residues obtained in the step S2; S3-2, dissolving and filtering the waste salt residues, and obtaining a detoxified solution; and S3-3, carrying out catalytic oxidation on the detoxified solution to obtain the mixed salt. The salt in the mixed waste salt solution can be recycled, pollution of the mixed waste salt solution to the environment is reduced, meanwhile, the salt can be recycled, energy is saved, and the environment is protected.

Description

technical field [0001] The present application relates to the field of waste salt treatment, in particular to a mixed waste salt recovery process. Background technique [0002] In many industries such as pesticide, medicine and printing and dyeing, a large amount of mixed-salt organic wastewater will be produced in the production process. These mixed-salt organic wastewater usually contain high COD and high toxicity, and the mixed-salt organic wastewater is also difficult for biological Therefore, the treatment of mixed salt organic wastewater has attracted much attention in the field of wastewater treatment. However, there is another obvious feature of mixed-salt organic wastewater, that is, mixed-salt organic wastewater contains a large amount of salt compounds. With the improvement of people's environmental protection concept, how to recycle the salt compounds in mixed-salt organic wastewater, It has also become a hot spot in the field of wastewater treatment. [0003] ...

Claims

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Application Information

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IPC IPC(8): C01D3/06C01D5/00
CPCC01D3/06C01D5/00
Inventor 朱成朱化军于平平
Owner 江苏固环环境科技有限公司
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