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CN-121988595-A - CO (carbon monoxide)2Tail gas and metallurgical slag recycling system and using method

CN121988595ACN 121988595 ACN121988595 ACN 121988595ACN-121988595-A

Abstract

The invention relates to the technical field of steel slag carbonization, and discloses a CO 2 tail gas and metallurgical slag recycling system and a using method thereof, wherein the system comprises a mill, a mixer, a humidifier and a carbonization reactor, wherein an air box is arranged on the bottom surface of the inner wall of the carbonization reactor and the side surface of the inner wall of the carbonization reactor, low-pressure flue gas enters from the side surface of the carbonization reactor, high-pressure flue gas enters from the bottom surface of the inner wall of the carbonization reactor and the side surface of the inner wall of the carbonization reactor, and enters into the carbonization reactor through the air box, and the flue gas moves from bottom to top and passes through the humidifying mixture; the kinetic energy of the flue gas is dynamically coupled with the posture of the flue gas, the high-pressure flue gas enters the carbonization reactor from the bottom surface and the side surface of the inner wall, the kinetic energy of the high-pressure flue gas is utilized to change the falling posture and drive the materials to flow, the materials are fully contacted with CO 2 in the flue gas in the blanking process, the carbonization reaction efficiency is improved, the emission concentration of CO 2 in the flue gas is reduced, and the comprehensive utilization of the steel metallurgical slag is realized.

Inventors

  • Zhang yasen
  • SONG LIHUI
  • MENG WENSHENG
  • ZHAI WEIWEI

Assignees

  • 浙江哈斯科节能技术有限公司

Dates

Publication Date
20260508
Application Date
20260312

Claims (8)

  1. 1. The utility model provides a CO 2 tail gas and metallurgical sediment resource utilization system, includes mill and blender and humidifier and carbonization reactor, wherein the mill is used for processing the mixture of metallurgical sediment and gypsum, the blender is used for mixture and auxiliary agent to mix and obtains the auxiliary agent mixture, humidifier regulation and control auxiliary agent mixture humidity obtains the humidification mixture, its characterized in that: After the humidifying mixture is fed and homogenized, the humidifying mixture is fed and homogenized through the upper part of the carbonization reactor, the bottom surface of the inner wall of the carbonization reactor and the side surface of the inner wall of the carbonization reactor are both provided with air boxes, low-pressure smoke enters from the side surface of the carbonization reactor, high-pressure smoke enters from the bottom surface of the inner wall of the carbonization reactor and the side surface of the inner wall of the carbonization reactor and enters into the carbonization reactor through the air boxes, and the smoke moves from bottom to top and passes through the humidifying mixture.
  2. 2. The recycling system for CO 2 tail gas and metallurgical slag according to claim 1, wherein a chain stirrer is arranged in the carbonization reactor and is positioned above the low-pressure flue gas inlet.
  3. 3. The recycling system for CO 2 tail gas and metallurgical slag according to claim 1, wherein the lower part of the carbonization reactor is designed into a conical discharging hopper, and the conical angle of the conical discharging hopper is more than or equal to 55 degrees.
  4. 4. The recycling system for CO 2 tail gas and metallurgical slag according to claim 1, wherein the discharging end of the carbonization reactor is provided with two valves, namely a manual gate valve and a pneumatic flow valve from top to bottom.
  5. 5. The recycling system for CO 2 tail gas and metallurgical slag according to claim 4, wherein a conveying device is arranged below the pneumatic flow valve, the conveying device is an air chute, and the conveying device adopts high-pressure flue gas as a conveying medium.
  6. 6. The recycling system for CO 2 tail gas and metallurgical slag according to claim 1, wherein the outer layer platform of the carbonization reactor is provided with at least 4 carbon monoxide fixed alarms.
  7. 7. The recycling system for CO 2 tail gas and metallurgical slag according to claim 1, wherein the high-pressure flue gas pipeline is regulated and controlled by a pressure regulating mechanism and then is conveyed to the gas tank.
  8. 8. The method for using the CO 2 tail gas and metallurgical slag recycling system according to any one of claims 1 to 7, which is characterized by comprising the following steps: S1, preparing a mixture according to a proportion, wherein the proportion of the metallurgical slag micro powder to the desulfurized gypsum is (90% -95%) (5% -10%), grinding the mixed mixture by a mill, and the specific surface area of the mixture is more than or equal to 500m 2 /Kg; S2, adding an auxiliary agent into the ground mixture, and putting the mixture into a mixer to obtain an auxiliary agent mixture, wherein the auxiliary agent mixture enters a humidifier to regulate and control humidity to obtain a humidifying mixture, and the material humidity of the humidifying mixture is less than 3%; s3, putting the humidified mixture into a carbonization reactor, wherein the reaction temperature is 30-60 ℃, the curing reaction pressure is 0.2-0.5 Mpa, low-pressure flue gas is symmetrically mixed into two sides of the carbonization reactor, and the low-pressure flue gas and the mixture at the upper part are fully chemically reacted in the reactor; And S4, using high-pressure flue gas as a medium, enabling the high-pressure flue gas to pass through a gas box at the bottom and the inner wall of the carbonization reactor, enabling the high-pressure flue gas to fully contact and react with the mixture from bottom to top, and playing a role of homogenization, and enabling the chain stirrer to increase the contact area of the material and CO 2 in the flue gas by stirring the material, so that the humidification mixture and carbon dioxide are subjected to chemical reaction to generate carbonate.

Description

CO 2 tail gas and metallurgical slag recycling system and using method Technical Field The invention relates to the technical field of steel slag carbonization, in particular to a CO 2 tail gas and metallurgical slag recycling utilization system and a use method. Background The steel slag mainly contains CaO, siO 2 and the like, the mineral composition contains C 3S、C2 S and other components with gelling activity, the activity is far lower than that of cement, the hydration reaction in water is slow, the later hydration can produce C-S-H gelling products, but the early effect is insufficient, and the steel slag further contains f-CaO and f-MgO, so that the problems of hydration expansion, unstable stability and the like of the products are caused, and the comprehensive utilization rate of the steel slag is low. The problems of the prior art are 1 that the system has low flue gas pressure and poor material homogenization effect, the reaction efficiency of the material and carbon dioxide in the flue gas is low, and 2, the material fluidization effect is poor. Chinese patent discloses a method for preparing solid waste cementing material by micro-carbonized steel slag (CN 119707328A), the patent discloses that micro-carbonized steel slag powder is matched with gypsum, and a carbonization reactor is carbonized under the environment of 0.1-0.5MPa and 20-60 ℃ in temperature range, but the technical scheme does not consider the problem of mass transfer efficiency, so that the carbonization period is long. Disclosure of Invention The invention aims to provide a CO 2 tail gas and metallurgical slag recycling system and a using method thereof, low-pressure flue gas enters the carbonization reactor from the middle upper part of the carbonization reactor, the kinetic energy of the flue gas is dynamically coupled with the posture of the flue gas, high-pressure flue gas enters the carbonization reactor from the bottom surface and the side surface of the inner wall, the kinetic energy of the high-pressure flue gas is utilized to change the falling posture and drive the low-pressure flue gas to flow, the material blanking process is fully contacted with CO 2 in the flue gas, the carbonization reaction efficiency is improved, the emission concentration of CO 2 in the flue gas is reduced, and the comprehensive utilization of iron and steel metallurgical slag is realized, so as to solve the problems in the background technology. In order to achieve the above purpose, the present invention provides the following technical solutions: The utility model provides a CO 2 tail gas and metallurgical slag resource utilization system, includes mill and blender and humidifier and carbonization reactor, wherein the mill is used for processing the mixture of metallurgical slag and gypsum, the blender is used for mixture and auxiliary agent to mix and obtain the auxiliary agent mixture, humidifier regulation and control auxiliary agent mixture humidity obtains the humidification mixture, and humidification mixture feed homogenization back is put in through carbonization reactor top, carbonization reactor's inner wall bottom surface with carbonization reactor inner wall side all settles the gas tank, and low pressure flue gas gets into from carbonization reactor's side, and high pressure flue gas gets into from carbonization reactor's inner wall bottom surface and inner wall side, and through the gas tank gets into in the carbonization reactor, and flue gas upward moves from down and passes humidification mixture. As a still further proposal of the invention, a chain type stirrer is arranged in the carbonization reactor, and the chain type stirrer is positioned above the low-pressure flue gas inlet. As a still further proposal of the invention, the lower part of the carbonization reactor is designed into a conical discharging hopper, and the conical angle of the conical discharging hopper is more than or equal to 55 degrees. As a still further scheme of the invention, the discharging end of the carbonization reactor is provided with two valves, namely a manual gate valve and a pneumatic flow valve from top to bottom. As a still further proposal of the invention, a conveying device is arranged below the pneumatic flow valve, the conveying device is an air chute, the design angle of the air chute is 12 degrees, and the conveying device adopts high-pressure flue gas as a conveying medium. As a still further scheme of the invention, at least 4 carbon monoxide fixed alarms are arranged on the outer layer platform of the carbonization reactor. As a still further scheme of the invention, the high-pressure flue gas pipeline is regulated and controlled by the pressure regulating mechanism and then is conveyed to the gas tank. As a still further scheme of the invention, the using method is as follows: S1, preparing a mixture according to a proportion, wherein the proportion of the metallurgical slag micro powder to the desulfurized gypsum is (90% -95