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Alkaline wastewater modified fly ash adsorbent and preparation method thereof

The technology of fly ash and adsorbent is applied in the field of preparation of alkaline wastewater modified fly ash adsorbent, which can solve the problem of wasting acid and alkali resources, and achieve the effect of high-efficiency adsorbent.

Pending Publication Date: 2022-03-11
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acid-alkali neutralization is a common method to treat alkaline wastewater, but it will waste a lot of acid and alkali resources

Method used

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  • Alkaline wastewater modified fly ash adsorbent and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) will contain KHCO 3 、K 2 CO 3 Concentrate the waste water with KCl at 80°C until a crystal film layer appears on the surface, and pass through the 2 Exhaust gas, K 2 CO 3 Absorb CO 2 After conversion to insoluble KHCO 3 , keep warm and crystallize at 65°C, KHCO is precipitated 3 Precipitated, KHCO was achieved by centrifugation 3 Separation of crystals from KCl solution; KHCO 3 The crystal is heated to 300°C and transforms into K 2 CO 3 , water and pure CO 2 , the CO produced by decomposition 2 collect and store

[0023] (2) Weigh 20g fly ash, impregnate it with 25wt% sulfuric acid solution at 90°C for 2 hours, the liquid-to-solid ratio of sulfuric acid solution to fly ash is 5, then wash with deionized water until neutral, 100 Dry at °C for 12 h;

[0024] (3) Use the K obtained in step 1 2 CO 3 Prepare the solution, weigh 2g of fly ash and add to 20mL concentration of 10wt% K 2 CO 3 solution, magnetically stirred at room temperature for 12 h, and ...

Embodiment 2

[0027] (1) will contain KHCO 3 、K 2 CO 3 Concentrate the waste water with KCl at 80°C until a crystal film layer appears on the surface, and pass through the 2 Exhaust gas, K 2 CO 3 Absorb CO 2 After conversion to insoluble KHCO 3 , keep warm and crystallize at 65°C, KHCO is precipitated 3 Precipitated, KHCO was achieved by centrifugation 3 Separation of crystals from KCl solution; KHCO 3 The crystal is heated to 300°C and transforms into K 2 CO 3 , water and pure CO 2 , the CO produced by decomposition 2 collect and store

[0028] (2) Weigh 20g fly ash, impregnate it with 25wt% sulfuric acid solution at 90°C for 2 hours, the liquid-to-solid ratio of sulfuric acid solution to fly ash is 5, then wash with deionized water until neutral, 100 Dry at °C for 12 h;

[0029] (3) Use the K obtained in step 1 2 CO 3 Prepare the solution, weigh 2g of fly ash and add to 20mL concentration of 20wt% K 2 CO 3 solution, magnetically stirred at room temperature for 12 h, and ...

Embodiment 3

[0032] (1) will contain KHCO 3 、K 2 CO 3 Concentrate the waste water with KCl at 80°C until a crystal film layer appears on the surface, and pass through the 2 Exhaust gas, K 2 CO 3 Absorb CO 2 After conversion to insoluble KHCO 3 , keep warm and crystallize at 65°C, KHCO is precipitated 3 Precipitated, KHCO was achieved by centrifugation 3 Separation of crystals from KCl solution; KHCO 3 The crystal is heated to 300°C and transforms into K 2 CO 3 , water and pure CO 2 , the CO produced by decomposition 2 collect and store

[0033] (2) Weigh 20g fly ash, impregnate it with 25wt% sulfuric acid solution at 90°C for 2 hours, the liquid-to-solid ratio of sulfuric acid solution to fly ash is 5, then wash with deionized water until neutral, 100 Dry at °C for 12 h;

[0034](3) Use the K obtained in step 1 2 CO 3 Prepare the solution, weigh 2g of fly ash and add to 20mL concentration of 30wt% K 2 CO 3 solution, magnetically stirred at room temperature for 12 h, and d...

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Abstract

The invention discloses an alkaline wastewater modified fly ash adsorbent and a preparation method thereof. The preparation method comprises the following specific steps: concentrating wastewater containing KHCO3, K2CO3 and KCl at the temperature of 80 DEG C until a crystal film layer appears on the surface, introducing waste gas containing CO2, converting K2CO3 into insoluble KHCO3 after absorbing CO2, carrying out heat preservation crystallization at the temperature of 65 DEG C, separating out KHCO3 precipitate, and carrying out centrifugation to realize separation of KHCO3 crystals and a KCl solution; heating the KHCO3 crystal to 300 DEG C, converting the KHCO3 crystal into K2CO3, water and pure CO2, and collecting and storing CO2 generated by decomposition; the method comprises the following steps: weighing 20 g of fly ash, dipping the fly ash in a 25 wt% sulfuric acid solution at 90 DEG C for 2 h, washing the fly ash with deionized water until the fly ash is neutral, and drying the fly ash at 100 DEG C for 12 h, the method comprises the following steps: weighing 2g of fly ash, adding the fly ash into 20mL of K2CO3 solution with the concentration of 10wt%-30wt%, magnetically stirring at room temperature for 12h, and drying at 80 DEG C by adopting a rotary evaporator; the dried sample is placed in a muffle furnace to be calcined for 4 h at the temperature of 400 DEG C, the heating rate is 10 DEG C / min, and the obtained sample is marked as K2CO3 (10)-CA.

Description

technical field [0001] The invention belongs to the technical field of resource utilization and carbon capture, and in particular relates to a preparation method and application of an alkaline waste water modified fly ash adsorbent. Background technique [0002] The emission of carbon dioxide is the main culprit of global warming. In recent years, the annual emission of carbon dioxide produced by global fuel combustion has continued to exceed 30 billion tons. The importance of carbon emission reduction is self-evident. In 2020, China proposed a double carbon target. In 2021, The online trading of China's carbon market was officially launched. Carbon capture technology can capture carbon dioxide from flue gas or air on a large scale, so that the content of carbon dioxide in the atmosphere can be substantially reduced and form negative emissions. This is the only way recognized by the International Energy Agency. Carbon capture can obtain carbon dioxide and lay the foundation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30B01D53/02
CPCB01J20/103B01J20/043B01D53/02B01D2257/504Y02C20/40
Inventor 宋夫交魏航汤子建徐千尧曹燕许琦
Owner YANCHENG INST OF TECH