Method for treating crystalline residual salt of salt-containing organic wastewater and application of method

A technology of organic wastewater and treatment methods, applied to the removal of solid waste, etc., can solve problems such as high toxicity, complex components, and high impurity content

Active Publication Date: 2019-12-10
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because of its complex components, high toxicity, and higher impurity content, it is more difficult to realize resource treatment, and the state manages it as hazardous waste

Method used

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  • Method for treating crystalline residual salt of salt-containing organic wastewater and application of method

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Experimental program
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Effect test

Embodiment 1

[0050] (1) Mix the crystalline residual salt of salt-containing organic wastewater with twice the mass fraction of 95% sulfuric acid, heat to 500° C., and react for 3 hours to obtain the miscellaneous salt containing sulfate;

[0051] (2) Mix the sulfate-containing miscellaneous salt obtained in step (1) with 4 times the mixed curing agent of kaolin: silica sand at a ratio of 1:2, grind to 100 mesh, and then roast at 1200°C for 2 hours to obtain water-insoluble mineral complex compounds.

[0052] The crystalline residual salt used in this example is from a pesticide factory in Weifang, Shandong Province, which is the residual salt evaporated from the concentrated mother liquor after fractional crystallization of the waste salt. The inorganic salts in the residual salt are mainly sodium chloride and sodium sulfate, and the TOC content in the residual salt is 8000mg / kg, calcium 620mg / kg, magnesium 73mg / kg, aluminum 95mg / kg, iron 40mg / kg, chromium 20mg / kg. The mineral complex c...

Embodiment 2

[0054] (1) Mix the crystalline residual salt of salt-containing organic wastewater with 1 times of sulfuric acid with a mass fraction of 98%, heat to 100° C., and react for 1 hour to obtain a sulfate-containing miscellaneous salt;

[0055] (2) Mix the sulphate-containing miscellaneous salt obtained in step (1) with 3 times red mud: fly ash mixed solidifying agent at a ratio of 1:3, grind to 20 mesh, and then roast at 700°C for 1 hour, A water-insoluble mineral complex compound is obtained.

[0056] The crystalline residual salt used in this example is from a pesticide factory in Weifang, Shandong Province, which is the residual salt evaporated from the concentrated mother liquor after fractional crystallization of the waste salt. The inorganic salts in the residual salt are mainly sodium chloride and sodium sulfate, and the TOC content in the residual salt is 8000mg / kg, calcium 620mg / kg, magnesium 73mg / kg, aluminum 95mg / kg, iron 40mg / kg, chromium 20mg / kg. The mineral complex...

Embodiment 3

[0058] (1) Mix the crystalline residual salt of salt-containing organic wastewater with 2.5 times of sulfuric acid with a mass fraction of 95%, heat to 400° C., and react for 3 hours to obtain a sulfate-containing miscellaneous salt;

[0059] (2) Mix the sulfate-containing miscellaneous salt obtained in step (1) with 4 times of fly ash, grind to 50 mesh, and then roast at 1150° C. for 2 hours to obtain a water-insoluble mineral complex compound.

[0060] The crystalline residual salt used in this example comes from the residual salt evaporated from the concentrated mother liquor after the waste salt of a certain chemical plant in Hebei is separated and crystallized. The inorganic salts in the residual salt are mainly potassium chloride and potassium sulfate, and the TOC content in the residual salt is 6500mg / kg, calcium 400mg / kg, magnesium 80mg / kg, aluminum 60mg / kg, iron 76mg / kg, chromium 26mg / kg. The mineral complex compound obtained by making the residual salt harmless has ...

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Abstract

The invention relates to a method for treating crystalline residual salt of salt-containing organic wastewater and application of the method. The method for treating the crystalline residual salt of the salt-containing organic wastewater comprises the following steps that (1) the crystalline residual salt of the salt-containing organic waste water and sulfuric acid are mixed and heated, so that inorganic salt in the crystalline residual salt is converted into sulfate to obtain sulfate-containing carnallite; and (2), the sulfate-containing carnallite in the step (1) is mixed with a curing agent, and then the mixture is pyrolyzed and solidified to obtain a mineral-state composite compound. The mineral-state composite compound obtained by the method can be comprehensively utilized as generalindustrial solid waste. The raw materials of the method for treating the crystalline residual salt of the salt-containing organic wastewater are cheap and easy to obtain, the technology is simple andthe cost is relatively low, the efficient removal of organic substances in the crystalline residual salt and the safe fixation of water-soluble salt can be realized, the resource utilization of the crystalline residual salt is realized, and industrial implementation is facilitated.

Description

technical field [0001] The invention relates to the technical field of solid waste disposal, in particular to a method for treating salt-containing organic waste crystal residual salt and its application. Background technique [0002] Coal chemical industry, chemical fertilizer industry, pesticide industry, pharmaceutical industry and other chemical and chemical industries will produce a large amount of saline organic wastewater in the process of wastewater treatment. In this type of wastewater, in addition to organic pollutants, it also contains a large amount of soluble inorganic salts, such as Cl - 、Na + , SO 4 2- , Ca 2+ wait. Only the removal of organic matter in saline organic wastewater and the separation and treatment of soluble salts are the final disposal goals of saline organic wastewater. For this reason, someone proposed the technology of "low-temperature heat utilization-evaporation-crystallization process for organic waste water containing salt" to treat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/626C03C1/00C04B18/02B09B3/00
CPCB09B3/00C03C1/002C04B18/027C04B35/62204C04B35/62605C04B35/62645C04B2235/3418C04B2235/349C04B18/023C04B18/0481C04B18/08C04B14/106
Inventor 徐红彬陈辉霞唐海燕张笛徐世红孙继远张红玲曹宏斌
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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