Method for removing organic matters from high organic matter carnallite and recycling inorganic salt

A technology for organic matter and inorganic salts, applied in chemical instruments and methods, alkali metal sulfite/sulfate purification, alkali metal halide purification, etc., can solve the problems of low organic matter removal rate and poor quality of inorganic salts, and achieve Significant energy saving effect, low cost and high salt recovery rate

Inactive Publication Date: 2017-09-08
BEIJING GUODIAN FUTONG SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of low organic matter removal rate and poor quality of inorganic salts in the existing high-organic miscellaneous salt w...

Method used

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  • Method for removing organic matters from high organic matter carnallite and recycling inorganic salt
  • Method for removing organic matters from high organic matter carnallite and recycling inorganic salt

Examples

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Effect test

Embodiment 1

[0040] COD content in wastewater 30000mg / L, Ca 2+ Content 20mg / L, Na + Content 25000mg / L, Cl - Content 38000mg / L, SO 4 2- The content is 1000mg / L, and the technological process of separating and recovering sodium chloride is shown in figure 1 ,include:

[0041] Step 1: Wastewater with high organic content and miscellaneous salt enters the evaporator at 115°C and evaporates under normal pressure until the mass percentage of inorganic salt is 22%; the evaporated water vapor and organic matter with low boiling point are condensed and subjected to biochemical treatment, and the condensed water obtained is reused in step 4;

[0042] Step 2: spray-dry the concentrated solution in step 1 at a temperature of 200°C, and dry to 85% of the content to obtain solid granular salt;

[0043] Step 3: Put the solid in step 2 into a dry distillation furnace, and treat it at 300°C for 300 minutes;

[0044] Step 4: add water to the solid after dry distillation, the mass ratio of water to wat...

Embodiment 2

[0048] COD content in wastewater 20000mg / L, Ca 2+ Content 15mg / L, Na + Content 16500mg / L, Cl - Content 25000mg / L, SO 4 2- The content is 500mg / L, and the technological process of separating and recovering sodium chloride is shown in figure 2 ,include:

[0049] Step 1: Wastewater with high organic content and mixed salt enters the evaporator and distills it under reduced pressure at 100°C until the mass percentage of inorganic salt is 25%; the evaporated water vapor and organic matter with low boiling point are condensed and subjected to biochemical treatment, and the condensed water obtained is reused in step 4;

[0050] Step 2: Add carbon powder to the concentrated solution in step 1, wherein the ratio of the concentrated solution to the carbon powder is 1:0.6, and the unit is mL:g, mix it with the concentrated solution, and stir evenly to obtain a powder;

[0051] Step 3: Put the solid in step 2 into a dry distillation furnace, and treat it at 400°C for 200 minutes;

[...

Embodiment 3

[0056] COD content in wastewater 10000mg / L, Ca 2+ Content 10mg / L, Na + Content 13800mg / L, Cl - Content 600mg / L, SO 4 2- The content is 28000mg / L, and the methods for separating and recovering sodium sulfate include:

[0057] Step 1: Wastewater with high organic content and miscellaneous salt enters the evaporator and distills it under reduced pressure at 90°C until the mass percentage of inorganic salt is 25%; the evaporated water vapor and organic matter with low boiling point are condensed and subjected to biochemical treatment, and the condensed water obtained is reused in step 4;

[0058] Step 2: Add fly ash to the concentrated solution in step 1, wherein the ratio of the concentrated solution to the fly ash is 1:4, and the unit is mL:g, mix it with the concentrated solution, and stir evenly to obtain a powder;

[0059] Step 3: Put the solid in step 2 into a dry distillation furnace, and treat it at 550°C for 60 minutes;

[0060] Step 4: add water to the solid after d...

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Abstract

The invention relates to a method for removing organic matters from high organic matter carnallite and recycling inorganic salt, and belongs to the field of treatment of waste water and hazardous waste. The method for removing organic matters from high organic matter carnallite and recycling inorganic salt comprises the following steps: step 1, introducing high organic matter carnallite waste water into an evaporator to conduct normal pressure or reduced pressure evaporation until the mass percent of the inorganic salt is 20%-25%, or conducting evaporative crystallization to obtain inorganic salt and a small amount of mother solution; step 2, preparing the concentrated solution or mother solution in the step 1 into a shaped solid; step 3, loading the solid in the step 2 into a dry distillation furnace, and conducting treatment at 300-700DEG C for 30-300min; step 4, adding water to the solid after dry distillation, conducting stirring and liquid solid separation, removing insoluble solid to obtain a saline solution; and step 5, crystallizing the saline solution in the step 4 to obtain the inorganic salt. The method for removing organic matters from high organic matter carnallite and recycling inorganic salt has high removal rate (above 99%) of organic matters, innocent treatment of the technical process, no secondary emission of hazardous waste and low cost.

Description

technical field [0001] The invention relates to the field of wastewater and hazardous waste treatment, in particular to a method for removing organic matter and recovering inorganic salts from high-organic miscellaneous salts. Background technique [0002] With the tightening of national environmental protection policies, direct discharge of industrial wastewater is no longer allowed, and "zero discharge" technology has become an important way to solve the contradiction between industrial development and water resources and the environment. The developed zero-discharge process removes organic matter to a certain extent through ion exchange, biochemical, membrane methods and other methods, and realizes purification and salt production by discharging high-concentration mother liquor, but it brings about the disposal of mother liquor. In addition, the miscellaneous salt produced by the near-zero emission projects that have been launched is still hazardous waste. Enterprises nee...

Claims

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Application Information

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IPC IPC(8): C02F1/04C02F9/14C10B53/08C10B57/14C01D3/14C01D5/16C01D9/16
CPCC02F1/048C01D3/14C01D5/16C01D9/16C01P2006/80C02F3/00C10B53/08C10B57/14
Inventor 滕济林李若征张旭辉田颖赵崇李惠宇苗文华刘晓宇李星伟
Owner BEIJING GUODIAN FUTONG SCI & TECH DEV
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