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A medicament for removing chlorine ions in polluted acid wastewater, a method for removing chlorine, and its application

A technology of polluted acid wastewater and chloride ions, which is applied in separation methods, water/sewage treatment, chemical instruments and methods, etc., can solve the problem of high cost, restricting the smooth advancement of wastewater treatment and recycling technology of polluted acid wastewater, and a large amount of consumption. question

Active Publication Date: 2021-04-20
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with impurities such as heavy metals and arsenic, the concentration of chloride ions in this type of wastewater can reach thousands to tens of thousands of ppm, which is extremely difficult to remove
[0003] The current industrial method for removing chloride ions in this type of wastewater is to use copper sulfate and waste copper slag produced in the smelting process as chlorine removers, so that zero-valent copper and chloride ions contained in divalent copper and copper slag can be neutralized. Reaction generates cuprous chloride precipitation, thereby chlorine ion is removed, but this method removes chlorine efficiency low (only about 60%), and the concentration of chloride ion after treatment can't meet the requirement of polluted acid wastewater reuse, and the price of waste copper slag High, large amount, resulting in high cost of the method
[0004] In addition, the method of using bismuth oxide as a chlorine removal agent to react with chloride ions to produce bismuth oxychloride precipitation, thereby removing chloride ions, has also been widely accepted because of its high efficiency (up to 92%). Concern, but this method is only applicable to sewage acid wastewater containing sulfuric acid concentration higher than 70g / L, and the amount of bismuth oxide required is large, resulting in extremely high cost, which greatly limits the application of this method in industry
[0005] In view of the above-mentioned technical defects, the removal of chloride ions in sewage acid wastewater is still a big technical problem, which greatly limits the smooth progress of resource treatment and reuse technology of sewage acid wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for removing chloride ions in polluted acid wastewater, comprising: adding 1.47 g of sodium bismuthate dihydrate to 200 mL of polluted acid wastewater whose concentrations of hydrogen ions and chloride ions are respectively 1.02 mol / L and 2471 mg / L, Magnetic stirring at room temperature of 20°C, the stirring frequency is 100r / min, the residual concentration of chloride ions in the polluted acid wastewater after 80 minutes of reaction is 39.5mg / L (measured by the chloride ion selective electrode method), and the removal rate of chloride ions is 98.4% . The chlorine gas generated during the reaction was introduced into a 10mL absorption container containing 9wt% sodium hydroxide solution through the pipeline on the container for absorption to obtain a chlorine gas absorption solution with a concentration of 3.24wt%. The bismuth oxychloride solid product was suction filtered, washed, dried at 60°C for 30 minutes, then added to the above 10mL chlorine gas absorptio...

Embodiment 2

[0044]A method for removing chloride ions in polluted acid wastewater, comprising: adding 2.73 g of sodium bismuthate dihydrate in 400 mL of polluted acid wastewater whose concentrations of hydrogen ions and chloride ions are respectively 0.82 mol / L and 2300 mg / L. Under 20 ℃ of room temperature magnetic stirring, stirring frequency is 150r / min, and the chlorine ion residual concentration in the polluted acid wastewater after reaction 120min is 39.1mg / L (measured with the chloride ion selective electrode method), and the removal rate of chloride ion is 98.3%. The chlorine gas generated during the reaction was passed into a 20mL absorption container containing 10wt% sodium hydroxide solution through the pipeline on the container for absorption to obtain a chlorine gas absorption solution with a concentration of 3.01wt%. The bismuth oxychloride solid product was suction filtered, washed, dried at 60°C for 30 minutes, then added to the above 20mL chlorine gas absorption solution, s...

Embodiment 3

[0046] A method for removing chloride ions in polluted acid wastewater, comprising: adding 2.70 g of sodium bismuthate dihydrate to 400 mL of polluted acid wastewater whose concentrations of hydrogen ions and chloride ions are respectively 0.89 mol / L and 2272 mg / L. Under 30 ℃ of room temperature magnetic stirring, stirring frequency is 150r / min, and the chlorine ion residual concentration in the polluted acid waste water after reacting 90min is 25.0mg / L (measured with the chloride ion selective electrode method), and the removal rate of chloride ion is 98.9%. The chlorine gas generated during the reaction was passed into a 20mL absorption container containing 9wt% sodium hydroxide solution through the pipeline on the container for absorption to obtain a chlorine gas absorption solution with a concentration of 3.00wt%. The bismuth oxychloride solid product was suction filtered, washed, dried at 60°C for 30 minutes, then added to the above 20mL chlorine gas absorption solution, s...

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Abstract

The invention relates to a medicament for removing chlorine ions in polluted acid wastewater, a chlorine removal method and application thereof, and belongs to the technical field of industrial wastewater treatment and reuse. In order to solve the technical problems of limited dechlorination efficiency, large dosage and high cost of existing chlorine removal agents, the present invention provides a medicament for removing chlorine ions in polluted acid wastewater, including bismuth salt and / or bismuth salt hydration things. The chlorine removal agent provided by the invention is easy to use, has high chlorine removal efficiency up to 98.9%, and the chlorine removal agent can be regenerated and recycled, so that the cost is low, which not only solves the problem of chlorine ion removal in polluted acid wastewater, but also realizes Resource recovery and utilization of chloride ions in polluted acid wastewater.

Description

technical field [0001] The invention relates to a medicament for removing chlorine ions in polluted acid wastewater, a chlorine removal method and application thereof, and belongs to the technical field of industrial wastewater treatment and reuse. Background technique [0002] Sewage acid wastewater from sulfuric acid industry, non-ferrous metal smelting and other industries has a large amount of production, high acidity (sulfuric acid concentration of 5-20%), and usually contains high concentrations of heavy metals, arsenic, fluorine, chlorine and other impurities, which are extremely difficult to treat waste water. In order to realize resource management of polluted acid wastewater, in recent years, researchers have proposed to remove the impurities in the polluted acid wastewater, and the acidic solution after the removal of impurities is recycled as dilute sulfuric acid. Compared with impurities such as heavy metals and arsenic, the concentration of chloride ions in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/58C02F1/72B01D53/78B01D53/68C02F101/12
CPCB01D53/68B01D53/78B01D2251/302B01D2251/304B01D2251/404B01D2251/604C02F1/58C02F1/72C02F2101/12
Inventor 彭先佳窦文月胡星云孔令昊
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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