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Method for recycling chloride ions in wastewater

A chlorine ion and wastewater technology, applied in chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc., can solve the problems of difficult application of desulfurization system, immature recovery and utilization technology of small amount of ozone chlorine gas, etc., and achieve expansion Application fields, promotion of efficient utilization, and effect of reducing waste water discharge

Active Publication Date: 2017-06-23
HUADIAN ELECTRIC POWER SCI INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the ozone generator has been industrialized, the escape and control of ozone in the system and the recovery and utilization of a small amount of chlorine are not mature enough, and it is difficult to apply it to the desulfurization system in the near future

Method used

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  • Method for recycling chloride ions in wastewater
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Effect test

Embodiment 1

[0035] Chlorine-containing wastewater was selected from the desulfurization wastewater of a thermal power plant in Guizhou. After pretreatment, the ion-containing chloride ion content was 23606 mg / kg. The extraction-reextraction system sets the pulse frequency of the pulse sieve plate column to 3Hz, and the pulse amplitude to 5mm. During the extraction process, triethanolamine is used as the extraction agent, the volume ratio of the organic phase to the aqueous phase is 1.1:1, and sulfonated kerosene (not the scientific name, sulfonated kerosene is also It is called No. 260 solvent oil and No. 260 special kerosene-type solvent oil, which are usually sulfonated kerosene and are the most commonly used diluent in the extraction process. Solvent oil is determined according to its 98% distillation temperature or dry point (100% distillation temperature ) to classify, the distillation range of No. 260 solvent oil is 195~260°C.) as the diluent, the volume ratio of sulfonated kerosene ...

Embodiment 2

[0037] Chlorine-containing wastewater was selected from a high-alumina fly ash industrial demonstration base in Inner Mongolia that produced high-concentration chlorine-containing wastewater during the production of white carbon black by hydrochloric acid method. After pretreatment, the ion-containing chloride ion content was 8352 mg / kg.

[0038] In the extraction-reextraction system, the pulse frequency of the pulse sieve plate column is set at 3 Hz, and the pulse amplitude is 5 mm. During the extraction process, polyacrylamide is used as the extraction agent, the volume ratio of the organic phase to the aqueous phase is 1.5:1, and No. 5 paint solvent oil (not the scientific name, paint And cleaning forever solvent oil is a category of solvent oil, the distillation range is 140 ~ 200 ℃, No. 5 is a brand of paint and cleaning forever solvent oil. Solvent oil is based on its 98% distillation temperature or dry point (100% distillation According to the product distillation range,...

Embodiment 3

[0040] Chlorine-containing wastewater is selected from a chlor-alkali chemical plant in Chongqing, and its ion-containing chloride ion content after pretreatment is 650mg / kg. In the extraction-stripping system, the pulse frequency of the pulse sieve plate column is set at 2 Hz, and the pulse amplitude is 2.5 mm. During the extraction process, triethanolamine is used as the extraction agent, the volume ratio of the organic phase to the aqueous phase is 1:1, and sulfonated kerosene is used as the diluent. The volume ratio of triethanolamine and triethanolamine is 30%, and at 20°C, extract for 10 minutes; in the stripping process, the ammonia / ammonium chloride mixed solution is the stripping agent, the mass concentration of ammonia water is 8%, the mass concentration of ammonium chloride solution is 25%, and the ammonia The excess coefficient of the product is 0.25. At 40°C, back-extract for 30 minutes; during the regeneration and washing process of the organic phase, wash with wa...

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Abstract

The invention provides a method for recycling chloride ions in wastewater and relates to the technical field of industrial water treatment and comprehensive utilization of resources. The method provided by the invention comprises the following steps: pre-treating chloride-containing wastewater to remove suspension matters; conveying the wastewater into an extracting tower; taking an organic amine as an extracting agent, and carrying out countercurrent extraction and desulfurization to remove the chloride ions in the wastewater; discharging raffinate from an extracting system; when the content of the chloride ions in the raffinate does not reach circulating utilization or emission standards, carrying out reflux extraction; enabling an extracting solution to enter a back extraction tower; carrying out countercurrent back extraction on an ammonium chloride solution containing ammonia to generate ammonium chloride; separating by a water washing tower, cooling and crystallizing to obtain an ammonium chloride product; returning organic amine back into the extracting tower for recycling and returning a washing solution back to the water washing tower for recycling.

Description

technical field [0001] The invention belongs to the technical field of industrial water treatment and resource comprehensive utilization, and in particular relates to the treatment of chlorine-containing waste water in industries such as chlor-alkali chemical industry, chemical industry, metallurgy, electric power, chemical fertilizer, electroplating, and leather, and the recycling and utilization of chlorine resources. Background technique [0002] At present, the water resource crisis has become a worldwide problem, seriously restricting the sustainable development of human society, and it is urgent to solve the water resource crisis. With the dual benefits of water and environmental protection, solving the problem of water resource shortage through sewage reuse has become the only way for the sustainable development of water resources. [0003] With the development of various sewage treatment technologies, the treatment technology of industrial wastewater has become more ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01C1/16C02F1/26C02F101/12
Inventor 刘伟伟李勇辉姬海宏于卫卫
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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