Search

CN-122010530-A - Method and system for preparing light ceramsite from high-temperature slag

CN122010530ACN 122010530 ACN122010530 ACN 122010530ACN-122010530-A

Abstract

The invention discloses a method and a system for preparing light ceramsite by high-temperature slag, and belongs to the technical field of industrial solid waste resource utilization. The method comprises the steps of feeding slag, steel slag or ferromolybdenum slag with the temperature higher than 1400 ℃ into a vertical or horizontal mixing furnace, adding industrial solid waste additives such as fly ash, coal gangue and the like, completing mineral phase reconstruction through mechanical or air flow stirring, dispersing the reconstructed high-temperature slag into balls through high-speed air flow carrying coal gangue ball cores, entering a horizontal rotary heat preservation furnace adjusting hole structure with the temperature not lower than 900 ℃, and finally screening through a rotary screen to obtain the light ceramsite with the particle size of 1-25 mm. The ceramsite prepared by the method has the density grade of 300-900, the cylinder pressure of 3-11 MPa and the water absorption rate of less than 10%. The invention realizes energy self-supply by utilizing the latent heat of the high-temperature slag, and the raw materials are all industrial solid wastes, so that the production cost of the ceramsite can be reduced, the pollution of the solid wastes can be reduced, and the invention is suitable for the production of light concrete aggregate in the projects of buildings, roads, bridges and the like.

Inventors

  • FENG GUANGQIN
  • FAN HAIHONG

Assignees

  • 陕西秦道新资源开发有限公司
  • 西安建筑科技大学

Dates

Publication Date
20260512
Application Date
20260209

Claims (10)

  1. 1. The method for preparing the light ceramsite by utilizing the high-temperature slag is characterized by comprising the following steps of: step 1, feeding high-temperature slag into a mixing furnace, and adding one or more additives of fly ash, coal gangue, gasified slag and red mud; Step 2, uniformly stirring the materials in the mixing furnace in a mechanical stirring or airflow stirring mode, and finishing the ore phase reconstruction reaction; Step 3, the reconstructed high-temperature slag flows out from the outlet of the bottom of the mixing furnace, is dispersed into balls by high-speed air flow carrying balloon producing cores, enters a holding furnace, and wraps the balloon producing cores in the holding furnace to form a high Wen Liaoqiu; step 4, preserving heat of the height Wen Liaoqiu in a heat preserving furnace, and finishing pore structure adjustment to form ceramsite; and 5, feeding the ceramsite flowing out of the heat preservation furnace into a rotary screen, and screening to obtain light ceramsite products with different particle sizes, wherein the light ceramsite is spherical particles with internal porous particle sizes of 1mm-25mm, the density grade is 300-900, the barrel pressure strength is 3MPa-11MPa, and the water absorption is less than 10%.
  2. 2. The method for preparing lightweight ceramsite by using high-temperature slag according to claim 1, wherein the high-temperature slag is slag, steel slag or ferromolybdenum slag, and the temperature is higher than 1400 ℃.
  3. 3. The method for preparing lightweight ceramsite by using high temperature slag as set forth in claim 1, wherein the mixing furnace in the step 1 is of a vertical or horizontal type structure.
  4. 4. The method for preparing lightweight ceramsite by using high-temperature slag according to claim 1, wherein the airflow stirring mode in the step 2 is specifically that a hood is arranged at the bottom of the mixing furnace, and air flows in at a high speed through the hood to stir the internal materials for mixing.
  5. 5. The method for preparing lightweight ceramsite by using high-temperature slag as set forth in claim 1, wherein the mechanical stirring in the step 2 is specifically that the mixing furnace drives the internal materials to rotate by rotating itself to achieve mixing.
  6. 6. The method for preparing lightweight ceramsite by using high-temperature slag according to claim 1, wherein the mechanical stirring mode in the step 2 is specifically that a high-temperature resistant stirring blade is arranged in a mixing furnace, and the material is driven to move by the rotation of the blade so as to realize mixing.
  7. 7. The method for preparing lightweight ceramsite by utilizing high-temperature slag according to claim 1, wherein the balloon-producing cores in the step 3 are coal gangue particles with the particle size of less than 1 mm.
  8. 8. The method for preparing lightweight ceramsite by using high-temperature slag as set forth in claim 1, wherein the holding furnace in the step 4 is a horizontal rotary furnace, and the temperature in the holding furnace is not lower than 900 ℃.
  9. 9. The method for preparing lightweight ceramsite by using high temperature slag as set forth in claim 1, wherein the ambient temperature of the ore phase reconstruction reaction in step 2 is not lower than 1400 ℃, and the reaction forms silicate ore phase.
  10. 10. The system for preparing the lightweight ceramsite from the high-temperature slag by using the method according to any one of claims 1-9 is characterized by comprising a mixing furnace, a ball core machine and a holding furnace, wherein the mixing furnace is used for receiving the high-temperature slag and additives and completing mineral phase reconstruction, the ball core machine is a Venturi jet pipe and is used for receiving high-speed air flow and a balloon core and accelerating the balloon core to 30 m/s, and the holding furnace is used for receiving the high-speed moving balloon core and the high-temperature slag after mineral phase reconstruction, forming high Wen Liaoqiu and completing pore structure adjustment.

Description

Method and system for preparing light ceramsite from high-temperature slag Technical Field The invention belongs to the technical field of industrial solid waste resource utilization, and particularly relates to a method and a system for preparing light ceramsite from high-temperature slag. Background The high-temperature slag is waste generated in the metal smelting process and mainly contains Ca, si, al, mg, fe and other elements. On the one hand, most of high-temperature slag has stable mineral phase structure and low activity due to the high-temperature process of 1450 ℃ or more, and cannot be fully utilized, such as steel slag, molybdenum-iron slag and the like. The traditional treatment mode is open-air stacking or landfill, which is extremely easy to cause secondary pollution. On the other hand, the high temperature slag discharged from the metallurgical furnace is mostly higher than 1450 ℃, and a large amount of energy is discharged to cause energy waste. How to recycle sensible heat of waste slag while recycling metallurgical slag is a new direction for realizing the double carbon target in the metallurgical industry. Under the guidance of the national dual-carbon strategy, light concrete required by the building material industry is paid attention to by the industry because of the advantages of light weight, heat preservation, sound insulation and the like, wherein the light ceramsite prepared by utilizing industrial solid waste is one of the focuses of attention as light concrete aggregate. The light ceramsite in the market at present is mainly produced by taking clay, shale, coal gangue and the like as main raw materials and coal dust or natural gas as fuel, and consumes a large amount of resources and energy. The chemical composition of high-temperature slag and the abundant latent heat of the high-temperature slag are utilized to realize the cooperation of metal smelting and ceramsite production, and the method has important significance for double targets in the metallurgical industry and low-carbon production in the building material industry. There are no reports of relevant aspects. Disclosure of Invention In order to solve the problems, the invention provides a method for preparing light ceramsite by using high-temperature slag, which comprises the following steps: step 1, feeding high-temperature slag into a mixing furnace, and adding one or more additives of fly ash, coal gangue, gasified slag and red mud; Step 2, uniformly stirring the materials in the mixing furnace in a mechanical stirring or airflow stirring mode, and finishing the ore phase reconstruction reaction; Step 3, the reconstructed high-temperature slag flows out from the outlet of the bottom of the mixing furnace, is dispersed into balls by high-speed air flow carrying balloon producing cores, enters a holding furnace, and wraps the balloon producing cores in the holding furnace to form a high Wen Liaoqiu; step 4, preserving heat of the height Wen Liaoqiu in a heat preserving furnace, and finishing pore structure adjustment to form ceramsite; and 5, feeding the ceramsite flowing out of the heat preservation furnace into a rotary screen, and screening to obtain light ceramsite products with different particle sizes, wherein the light ceramsite is spherical particles with internal porous particle sizes of 1mm-25mm, the density grade is 300-900, the barrel pressure strength is 3MPa-11MPa, and the water absorption is less than 10%. Preferably, the high temperature slag is slag, steel slag or ferromolybdenum slag, and the temperature is higher than 1400 ℃. Preferably, the mixing furnace in the step 1 is of a vertical or horizontal structure. Preferably, the air flow stirring mode in the step 2 specifically comprises that a hood is arranged at the bottom of the mixing furnace, air flows in at a high speed through the hood, and internal materials are stirred to realize mixing. Preferably, the mechanical stirring mode in the step 2 is specifically that the mixing furnace drives the internal materials to rotate by rotating the mixing furnace so as to realize mixing. Preferably, the mechanical stirring mode in the step 2 is specifically that a high-temperature resistant stirring blade is arranged in the mixing furnace, and the blade rotates to drive the materials to move so as to realize mixing. Preferably, the balloon producing core in the step 3 is coal gangue particles with the particle size smaller than 1mm. Preferably, the holding furnace in the step 4 is a horizontal rotary furnace, and the temperature in the holding furnace is not lower than 900 ℃. Preferably, the ambient temperature of the ore phase reconstruction reaction in the step 2 is not lower than 1400 ℃, and the reaction forms silicate ore phases. The invention also provides a system for preparing the lightweight ceramsite by using the high-temperature slag, which comprises a mixing furnace, a ball core machine and a holding furnace, wherein the mixing furnace is us