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Method for recycling discharged water through carbon neutralization

A carbon neutralization and solution technology, which is applied in chemical instruments and methods, separation methods, water/sewage treatment, etc., can solve the problems of solution pH value and conductivity increase, high processing cost, and inability to meet industrial production requirements, etc. Achieve the effect of reducing the conductivity of the solution, meeting the requirements of the reuse index, and solving technical drawbacks

Pending Publication Date: 2022-02-08
LANZHOU PETROCHEM COLLEGE OF VOCATIONAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it does not solve the technical problem of increasing the pH value and conductivity of the solution
In addition, the cost of using the existing ultra-high calcium aluminum precipitation method is too high to meet the requirements of industrial production

Method used

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  • Method for recycling discharged water through carbon neutralization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Measure 100ml of external drainage into the reactor, slowly raise the temperature to 25°C, start stirring, and control the stirring speed at 380rpm / min. Add 0.62 g of calcium hydroxide slurry with a mass fraction of 60%, and react at a constant temperature of 25° C. for 30 minutes. After the reaction, the solution was filtered by vacuum filtration, and the filtrate was poured into the reactor again. Add 0.56g of calcium hydroxide and 0.30g of calcium metaaluminate mixed powder into the above reactor, and the initial reaction temperature and stirring speed remain unchanged. After constant temperature reaction for 20 minutes, adjust the stirring speed to 300 rpm / min, continue the reaction for 20 minutes, filter, and transfer the clear liquid into a pressure-resistant three-necked bottle. CO2 gas is introduced through the bottom, and the pressure is controlled at 0.05Mpa. N2 was injected above the three-neck bottle for supplementary pressure, so that the CO2 escape rate ...

Embodiment 2

[0041] Measure 100ml of external drainage into the reactor, slowly raise the temperature to 25°C, start stirring, and control the stirring speed at 380rpm / min. Add 0.50 g of calcium oxide slurry with a mass fraction of 55%, and react at a constant temperature of 25° C. for 30 minutes. After the reaction, the solution was filtered by vacuum filtration, and the filtrate was poured into the reactor again. Add 0.56g of calcium hydroxide and 0.30g of calcium metaaluminate mixed powder into the above reactor, and the initial reaction temperature and stirring speed remain unchanged. After constant temperature reaction for 20 minutes, adjust the stirring speed to 300 rpm / min, continue the reaction for 20 minutes, filter, and transfer the clear liquid into a pressure-resistant three-necked bottle. CO2 gas is introduced through the bottom, and the pressure is controlled at 0.05Mpa. N2 was injected above the three-neck bottle for supplementary pressure, so that the CO2 escape rate was ...

Embodiment 3

[0043]Measure 100ml of external drainage into the reactor, slowly raise the temperature to 25°C, start stirring, and control the stirring speed at 380rpm / min. Add 0.50 g of calcium oxide slurry with a mass fraction of 55%, and react at a constant temperature of 25° C. for 30 minutes. After the reaction, the solution was filtered by vacuum filtration, and the filtrate was poured into the reactor again. Add 0.43g of calcium oxide and 0.30g of calcium metaaluminate mixed powder into the above reactor, and the initial reaction temperature and stirring speed remain unchanged. After constant temperature reaction for 20 minutes, adjust the stirring speed to 300 rpm / min, continue the reaction for 20 minutes, filter, and transfer the clear liquid into a pressure-resistant three-necked bottle. CO2 gas is introduced through the bottom, and the pressure is controlled at 0.05Mpa. N2 was injected above the three-neck bottle for supplementary pressure, so that the CO2 escape rate was 50 bu...

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Abstract

The invention relates to the technical field of chloride ion removal and carbon neutralization recycling, in particular to a method for recycling discharged water through carbon neutralization. According to the method, sodium metaaluminate is replaced by calcium metaaluminate, so that the treatment cost is reduced, and a support is provided for later carbon neutralization. The reaction mechanism of an ultrahigh calcium aluminum precipitation method is that Ca(OH)2, Al(OH)3 and Cl<-> react to form a Freund's salt precipitate, and the added aluminate is hydrolyzed to form Al(OH)3. Besides, CO2 is adopted as a carbon neutralizer to replace traditional acid carbonate, the pH value of the solution can be regulated and controlled, the CO2 and the added calcium salt can form sediment, and the purpose of reducing the conductivity of the solution is achieved.

Description

technical field [0001] The invention relates to the technical field of chloride ion removal and carbon neutralization recycling, in particular to a method for recycling external drainage through carbon neutralization. Background technique [0002] At present, the feasible methods for removing chloride ions mainly include: membrane separation method, electrochemical method, ion exchange method, evaporation crystallization and precipitation method. Electrochemical, ion exchange and evaporative crystallization methods are no longer suitable for low-salt effluents. The initial investment of the membrane separation method is too large, and the later maintenance cost is too high. Therefore, the precipitation method has become the most economical and effective method for removing chloride ions in low-chlorine external drainage. Commonly used precipitants are silver nitrate, cuprous chloride and mercury nitrate. The silver nitrate method cannot be applied in industry because silve...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/00C02F1/52B01D53/62B01D53/78C01F11/46C01F11/02
CPCC02F1/00C02F1/5245B01D53/62B01D53/78C01F11/46C01F11/02Y02W30/91
Inventor 侯侠孙耀华王海王同麟卢勇魏贤张龙周超赵彦龙徐成唐蓉萍
Owner LANZHOU PETROCHEM COLLEGE OF VOCATIONAL TECH
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