Salt leaching and in-situ oxidation combined method for refined treatment of industrial waste salt containing organic matters

A technology for refining and treating industrial waste salt, which is applied in the purification of alkali metal chlorides, alkali metal halides, alkali metal sulfite/sulfate, etc. It can solve the problems of poor removal of organic pollutants, low purity of recovered salt, and The problem of small application range can achieve the effect of avoiding high energy consumption and pollution of incineration tail gas, reducing production cost and energy consumption

Inactive Publication Date: 2019-11-15
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the removal effect of organic pollutants by this method is poor, the purity of recovered salt is low, and the application range is small.

Method used

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  • Salt leaching and in-situ oxidation combined method for refined treatment of industrial waste salt containing organic matters

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Effect test

Embodiment 1

[0066] This embodiment provides a method for refining and treating industrial waste salt containing organic matter by washing salt combined with in-situ oxidation, which specifically includes the following steps:

[0067] (I) preparation concentration is 30wt% sodium chloride solution (washing salt solution) at 60 ℃, under stirring condition, add the sodium chloride waste salt that COD content is 100000mg / L, the volume of washing salt solution and sodium chloride The mass ratio of waste salt is 10m 3 : 1t, the temperature of the slurry is controlled to be 90°C, and the stirring is continued for 6h;

[0068] (II) In the rinsing slurry that step (I) obtains, add the mixed oxidizing agent of required theoretical amount 10 times, comprise hydrogen peroxide (3 times of theoretical amount), sodium hypochlorite (3 times of theoretical amount) and oxygen (theoretical amount) in the mixed oxidizing agent 4 times of that), add hydrochloric acid to adjust the pH=3, carry out the oxidati...

Embodiment 2

[0073] This embodiment provides a method for refining and treating industrial waste salt containing organic matter by washing salt combined with in-situ oxidation, which specifically includes the following steps:

[0074] (1) preparation concentration is 10wt% sodium sulfate solution (washing salt solution) at 30 DEG C, add COD content under stirring condition and be the sodium sulfate waste salt of 35000mg / L, the volume of washing salt solution is the same as that of sodium sulfate waste salt The mass ratio is 7m 3 : 1t, the temperature of the slurry is controlled to be 50°C, and the stirring is continued for 2h;

[0075] (II) Add 7 times the required theoretical amount of sodium peroxide to the rinsing slurry obtained in step (I) to carry out an oxidation reaction, control the oxidation reaction temperature to 50° C., and continue stirring for 2 hours;

[0076] (Ⅲ) The reaction product obtained in step (II) is subjected to solid-liquid separation, and the liquid obtained is...

Embodiment 3

[0080] This embodiment provides a method for refining and treating industrial waste salt containing organic matter by washing salt combined with in-situ oxidation, which specifically includes the following steps:

[0081] (I) preparation concentration is 0wt% sodium chloride solution (washing salt solution) at 30 DEG C, under stirring condition, add the sodium chloride waste salt that COD content is 100mg / L, the volume of washing salt solution and sodium chloride The mass ratio of waste salt is 3m 3 : 1t, the temperature of the slurry is controlled to be 95°C, and the mixing and suspension operation is 0.5h;

[0082] (II) Add ozone 5 times the required theoretical amount to the rinsing slurry obtained in step (I) to carry out an oxidation reaction, control the oxidation reaction temperature to 95° C., and continue stirring for 8 hours;

[0083] (Ⅲ) solid-liquid separation is carried out to the reaction product obtained in step (II), and the obtained liquid is returned to step...

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Abstract

The invention provides a salt leaching and in-situ oxidation combined method for refined treatment of industrial waste salt containing organic matters. The refined treatment method includes: mixing and rinsing an industrial waste salt and a salt leaching solution, then subjecting the obtained rinsing slurry to oxidation reaction with an oxidant, and conducting solid-liquid separation to obtain a refined crystalline salt. The method provided by the invention uses slurry rinsing to cooperate with in-situ oxidation, realizes refining and purification of the industrial waste salt, at the same timereduces the COD content of the industrial waste salt, avoids the high energy consumption and incineration tail gas pollution caused by incineration method and evaporative crystallization method, realizes resource regeneration of the waste salt, not only has a green and environment-friendly process, but also can realize effective removal of organic matters, and the obtained refined crystalline salt has high purity.

Description

technical field [0001] The invention belongs to the technical field of refining and purification, and relates to a refining treatment method for industrial waste salt containing organic matter, in particular to a refining treatment method for industrial waste salt containing organic matter by combining slurry rinsing and in-situ oxidation. Background technique [0002] Industrial waste salt is one of the most common pollutants in my country's existing industries. Waste salt mainly comes from the chemical industry. As a kind of pollutant that is difficult to deal with, it has a large output. The general treatment method is to use water to dissolve it and then dilute it for discharge. This treatment causes serious land pollution. In the face of increasingly stringent environmental protection policies, the treatment and disposal of waste salt has become an urgent problem to be solved. [0003] Industrial salt is not only an important chemical raw material, but also a national s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/14C01D3/04C01D5/16
CPCC01D3/04C01D3/14C01D5/16C01P2006/80
Inventor 徐红彬张笛孙晓岩陈辉霞唐海燕张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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