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Treatment method for removing fluorine and chlorine ions in acidic wastewater

A treatment method and chloride ion technology, applied in water/sewage treatment, degassed water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of low removal efficiency, incomplete separation, high heat consumption, etc. Achieve the effect of high separation efficiency, energy saving and low cost

Inactive Publication Date: 2016-07-06
云南世邦环保科技发展有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this process needs to consume a lot of heat, F and Cl will combine with metal ions in the sewage acid, and it is not easy to form volatile gas substances, the removal efficiency is low, and the separation is not complete

Method used

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  • Treatment method for removing fluorine and chlorine ions in acidic wastewater

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Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: the processing method of removing fluorine, chloride ion in polluted acid, comprises the following steps: after the polluted acid that contains fluorine 430mg / L, chlorine 530mg / L collects, concentrates in the concentrating tower, described polluted acid liquid from The top of the concentration tower is sprayed down to form small droplets. Hot air enters from the bottom of the concentration tower, and the countercurrent contact is performed for heat exchange. The dirty acid solution is quickly heated to 100°C, and a saturated vapor pressure zone of water is formed above the concentration tower. The obtained steam flows into the circulating pool after being condensed, and the dirty acid solution is concentrated in the concentration tower for multiple cycles until the mass percentage of sulfuric acid is 50%; It enters from the bottom of the tower and contacts in countercurrent for heat exchange. The volume ratio of gas to liquid is 10, and the concentrated liq...

Embodiment 2

[0024] Embodiment 2: the processing method of removing fluorine, chloride ion in polluted acid, comprises the following steps: after the polluted acid that contains fluorine 430mg / L, chlorine 530mg / L collects, concentrates in concentration tower, described polluted acid liquid from Spray down from the top of the concentration tower to form small droplets. Hot air enters from the bottom of the concentration tower and contacts in countercurrent for heat exchange. The dirty acid solution is quickly heated to 120°C, forming a saturated vapor pressure zone of water above the concentration tower. The obtained steam flows into the circulating pool after being condensed, and the dirty acid solution is concentrated in the concentration tower for multiple cycles until the mass percentage of sulfuric acid is 50%; It enters from the bottom of the tower, contacts in countercurrent for heat exchange, the volume ratio of gas to liquid is 50, and the concentrated liquid is heated to 200°C, the...

Embodiment 3

[0025]Embodiment 3: the processing method of removing fluorine, chloride ion in polluted acid, comprises the following steps: after the polluted acid that contains fluorine 430mg / L, chlorine 530mg / L collects, concentrates in the concentration tower, described polluted acid liquid from The top of the concentration tower is sprayed down to form small droplets. Hot air enters from the bottom of the concentration tower, and the countercurrent contact performs heat exchange. The dirty acid solution is quickly heated to 110°C, forming a saturated vapor pressure zone of water above the concentration tower, and Use a hydrophilic membrane to filter the steam, and the obtained steam flows into the circulating water pool after being condensed, and the dirty acid solution is concentrated in the concentration tower for multiple cycles until the mass percentage of sulfuric acid is 60%; the concentrated solution obtained by concentration is sprayed from the top of the stripping tower Next, th...

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Abstract

The invention discloses a treatment method for removing fluorine and chlorine ions in acidic wastewater. The method comprises the steps of concentration, air stripping, vulcanization and alkali solution elution. The method specially comprises the following steps: after the acidic wastewater is collected, the acidic wastewater is concentrated in a concentrating tower: the acidic wastewater is quickly heated to 100-120 DEG C, and is circulated repeatedly in the concentrating tower until the mass percent of the sulfuric acid is not less than 50%; the concentrated solution is heated to 150-200 DEG C, so that the contained chlorine and fluorine ions form hydrogen chloride and hydrogen fluoride which are volatilized into steam; the contained sulfuric acid can not be easily volatilized so as to form the concentrated acid solution; a vulcanizing agent is added into the obtained concentrated acid solution, so that impurities in the concentrated acid form an insoluble sulfide precipitate; and filtration is performed to obtain regenerated acid and sulfides. The air can be heated by residual heat, various impurities can be separated out of the sulfuric acid waste solution, no wastewater is generated, and the treated regenerated acid can be recovered. Thus, the method has the advantages of simple technique, high separation efficiency, lower cost and the like.

Description

technical field [0001] The invention belongs to the technical field of industrial waste acid treatment, and relates to a method for removing impurities from waste acid and polluted acid, in particular to a method for removing chlorine and fluorine ions from polluted acid. Background technique [0002] In metal smelting production, metal electrolysis, flue gas acid production and other industries, smelting flue gas contains a large amount of SO 2 As well as some harmful metal components, most smelters have built two-to-two-suction acid production systems to realize smoke and dust recovery and SO 2 Sulfuric acid is produced, but in this process, a large amount of strongly acidic wastewater containing heavy metals will be produced, referred to as dirty acid. The polluted acid produced contains fluorine, chlorine, mercury, arsenic, cadmium and other toxic substances, and the content is higher than that of ordinary industrial wastewater, which is difficult to treat. The most wi...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/12C02F101/14C02F103/18
CPCC02F1/048C02F1/10C02F1/20C02F1/5236C02F9/00C02F2101/12C02F2101/14C02F2103/18
Inventor 韦建初张浩朱永强彭国庆李婷李金艳张福靖
Owner 云南世邦环保科技发展有限公司
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