Search

CN-121972126-A - Preparation method of adsorbent, adsorbent and high-temperature flue gas deacidification method

CN121972126ACN 121972126 ACN121972126 ACN 121972126ACN-121972126-A

Abstract

The application discloses a preparation method of an adsorbent, the adsorbent and a high-temperature flue gas deacidification method, wherein the preparation method of the adsorbent is based on waste incineration slag, the waste incineration slag is crushed, screened and dried to obtain pretreated slag, a calcium source is added into the pretreated slag and uniformly mixed to obtain a calcium-reinforced slag mixture, a hydrogen peroxide solution is added into the calcium-reinforced slag mixture, metal ions react with hydrogen peroxide by utilizing the alkaline environment of the waste incineration slag to obtain an in-situ generated metal peroxide solution, and the in-situ generated metal peroxide solution is subjected to primary drying and calcination to decompose in-situ generated metal peroxide so as to realize internal pore-forming, so that the adsorbent is obtained. The slag is converted into the adsorbent, so that solid waste disposal and flue gas purification are realized, the cost of raw materials is reduced, and the land occupation and pollution risk of slag landfill are reduced.

Inventors

  • MIAO QI
  • JIAO XIANFENG
  • RAN CONGHUA

Assignees

  • 深圳能源环保股份有限公司

Dates

Publication Date
20260505
Application Date
20251227

Claims (10)

  1. 1. A method for preparing an adsorbent based on refuse incinerator slag, which is characterized by comprising the following steps: crushing, screening and drying the waste incineration slag to obtain pretreated slag; adding a calcium source into the pretreated slag and uniformly mixing to obtain a calcium-enriched slag mixture; adding a hydrogen peroxide solution to the calcium-fortified slag mixture, reacting metal ions with hydrogen peroxide using the alkaline environment of the waste incineration slag to obtain an in situ generated metal peroxide solution, and And (3) primarily drying and calcining the in-situ generated metal peroxide solution to decompose the in-situ generated metal peroxide so as to realize internal pore-forming, thereby obtaining the acid gas adsorbent.
  2. 2. The method for preparing the adsorbent based on the garbage incinerator slag according to claim 1, which is characterized in that: The grain diameter of the garbage incinerator slag after screening is 100-150 mu m, and the water content of the pretreated slag obtained after drying is less than 3%.
  3. 3. The method for preparing the adsorbent based on the garbage incinerator slag according to claim 1 or 2, characterized in that: the pretreated slag contains not less than 5% of transition metal oxide.
  4. 4. The method for preparing the adsorbent based on the garbage incinerator slag according to claim 1, which is characterized in that: the calcium source is at least one of calcium oxide or calcium hydroxide.
  5. 5. The method for preparing the adsorbent based on the garbage incinerator slag according to claim 1, which is characterized in that: The addition amount of the calcium source is 10% -30% of the pretreated slag.
  6. 6. The method for preparing the adsorbent based on the garbage incinerator slag according to claim 1, which is characterized in that: The mass concentration of the hydrogen peroxide solution is 10% -15%; The pH value is controlled to be 10-12 and the temperature is controlled to be 15-30 ℃ during the process of adding the hydrogen peroxide solution into the calcium-fortified slag mixture.
  7. 7. The method for preparing the adsorbent based on the garbage incinerator slag according to claim 1, which is characterized in that: the temperature of the preliminary drying is 120 ℃, and the preliminary drying is carried out and then the calcination is carried out in a muffle furnace.
  8. 8. The method for preparing the adsorbent based on the garbage incinerator slag according to claim 7, wherein: The calcination is carried out by heating from room temperature to 450-550 ℃ at a heating rate of 3-8 ℃ per minute, preserving heat for 1-3 hours, and then cooling at room temperature.
  9. 9. The adsorbent produced by the process for producing a waste incineration slag-based adsorbent according to any one of claims 1 to 8, wherein the specific surface area of the acid gas adsorbent is 25 to 40m2/g and the porosity is not less than 40%.
  10. 10. A method for deacidifying high-temperature flue gas by using the adsorbent as claimed in claim 9, wherein the temperature of the high-temperature flue gas is 300-800 ℃, and the high-temperature flue gas contains sulfur dioxide and hydrogen chloride.

Description

Preparation method of adsorbent, adsorbent and high-temperature flue gas deacidification method Technical Field The application belongs to the technical field of environmental engineering and adsorption materials, and particularly relates to a preparation method of an adsorbent, the adsorbent and a high-temperature flue gas deacidification method. Background Along with the acceleration of urban process and the continuous increase of household garbage production, the garbage incineration power generation technology has become one of the main modes of household garbage treatment due to the advantages of reduction, harmlessness and recycling. However, a large amount of acid gases such as sulfur dioxide (SO 2), hydrogen chloride (HCl), etc., as well as incinerator slag are generated during the garbage incineration process. Efficient treatment and recycling of these byproducts is a key challenge facing the current waste incineration industry. At present, the deacidification of the waste incineration flue gas mainly adopts a calcium-based deacidification agent, such as slaked lime (Ca (OH) 2), baking soda (NaHCO 3) and the like, and the neutralization reaction is carried out through a dry method or a semi-dry method process. Although the calcium-based deacidification agent has wide sources and low cost, the specific surface area is small, the porosity is low, the deacidification efficiency is limited, and the deacidification agent needs to be used in a large amount to meet the increasingly strict emission standard (such as the emission concentration of SO 2 is lower than 30mg/m < 3 >), SO that the operation cost is increased, and more fly ash is generated. In addition, the traditional deacidification process is mostly carried out at low temperature (200 ℃) and has the problems of high energy consumption, easy formation of dioxin, waste of flue gas waste heat and the like. In recent years, researchers have attempted to increase the specific surface area and the reactivity of deacidification agents by adding modifiers (such as KOH, lanthanum oxide, etc.) or by using industrial residues (such as carbide slag). There are also patents attempting to introduce rare earth slag into the deacidification agent composition, although the removal rate of dioxin is improved to some extent, the basic framework of medium-low temperature deacidification is not removed due to the limitation of poor high-temperature stability of the deacidification agent, and the cost is increased due to the addition of rare mineral components. However, these improvements have not fully utilized the resources of the incineration process itself nor effectively solved the problems associated with the high Wen Tuosuan. Disclosure of Invention The application provides a preparation method of an adsorbent, the adsorbent and a high-temperature flue gas deacidification method, wherein the incinerator slag is used as a raw material, transition metal oxide and calcium oxide (CaO) in the incinerator slag are compounded through an optimized treatment process to form the high-efficiency adsorbent with double functions of catalysis and absorption, and the adsorbent can be used for adsorbing acidic gas pollutants at high temperature. In order to achieve the above purpose, the present application adopts the following technical scheme: a method for preparing an adsorbent based on refuse incinerator slag, comprising the following steps: crushing, screening and drying the waste incineration slag to obtain pretreated slag; adding a calcium source into the pretreated slag and uniformly mixing to obtain a calcium-enriched slag mixture; adding a hydrogen peroxide solution to the calcium-fortified slag mixture, reacting metal ions with hydrogen peroxide using the alkaline environment of the waste incineration slag to obtain an in situ generated metal peroxide solution, and And (3) primarily drying and calcining the in-situ generated metal peroxide solution to decompose the in-situ generated metal peroxide so as to realize internal pore-forming, thereby obtaining the acid gas adsorbent. As a preferable scheme, the particle size of the sieved garbage incinerator slag is 100-150 mu m, and the water content of the pretreated slag obtained after drying is less than 3%. Preferably, the pretreated slag contains not less than 5% of transition metal oxide. Preferably, the calcium source is at least one of calcium oxide or calcium hydroxide. Preferably, the addition amount of the calcium source is 10% -30% of the pretreated slag. As a preferred scheme, the mass concentration of the hydrogen peroxide solution is 10% -15%; The pH value is controlled to be 10-12 and the temperature is controlled to be 15-30 ℃ during the process of adding the hydrogen peroxide solution into the calcium-fortified slag mixture. Preferably, the temperature of the primary drying is 120 ℃, and the primary drying is carried out and then the primary drying is carried out in a muffle furnace for calcination. P