Steel slag waste heat comprehensive utilization and f-CaO grading digestion method and system

A steel slag and waste heat technology, applied in the field of resource utilization of steel slag, can solve the problems of poor stability of steel slag, achieve high stability, improve energy efficiency, and reduce operating costs

Active Publication Date: 2022-04-12
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of poor stability of steel slag caused by incomplete elimination of free calcium oxide in the prior art, the present invention provides a method and system for comprehensive utilization of steel slag waste heat and f-CaO graded digestion

Method used

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  • Steel slag waste heat comprehensive utilization and f-CaO grading digestion method and system
  • Steel slag waste heat comprehensive utilization and f-CaO grading digestion method and system
  • Steel slag waste heat comprehensive utilization and f-CaO grading digestion method and system

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Embodiment 1

[0034] A comprehensive utilization of steel slag waste heat and f-CaO graded digestion system, such as figure 1 As shown, the overall use of the concept of source quenching and tempering, particle size control, and process intensification improves the comprehensive utilization rate of waste heat in steel slag and the f-CaO digestion rate. Including the following steps:

[0035] Source quenching and tempering: pour the molten steel slag into the molten steel slag buffer 1, add a certain amount of silicon-containing steel slag modifiers such as fly ash, iron tailings, etc. into the molten steel slag buffer 1, pass Liquid mixing is carried out mechanically, so that the added steel slag modifier reacts with the f-CaO in the steel slag, thereby reducing the f-CaO content in the steel slag;

[0036] Particle size control: through the centrifugal granulator 2, the modified steel slag is centrifugally granulated and the particle size is controlled by adjusting the centrifugal speed, ...

Embodiment 2

[0043] Such as figure 2 As shown, a steel slag waste heat comprehensive utilization and f-CaO graded digestion system includes a cold steel slag buffer 6 and a cold steel slag breaker 7 . Pour the cold steel slag piled up in the steel plant into the cold steel slag buffer 6, which is connected to the cold steel slag breaker 7. The steel slag is mixed, and the cold steel slag is heated by the waste heat of the steel slag, and then enters the heat exchange moving bed 3, and the subsequent process operation is carried out in sequence, which can process a large amount of existing cold steel slag and realize the resource utilization of solid waste.

Embodiment 3

[0045] Such as image 3 As shown, the scrubber 8 is used to treat the flue gas / CO from the top of the pressurized moving bed 4 2 Separated from the steam mixture flow, the water introduced into the scrubber 8 can realize CO 2 It is separated from water vapor and connected to the pressurized moving bed through pipelines for recycling.

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Abstract

The invention belongs to the technical field of steel slag resource utilization, and particularly relates to a steel slag waste heat comprehensive utilization and f-CaO graded digestion method which comprises the following steps: mixing and adding a steel slag modifier into molten steel slag; carrying out centrifugal granulation on the steel slag; waste heat of the steel slag is absorbed through cold air and water, and hot air and water vapor are generated; heating water through the hot air to generate water vapor; and performing graded digestion on f-CaO in the steel slag by utilizing flue gas of a steel mill and the water vapor. According to the technological process, high-grade sensible heat is recycled from the molten steel slag, the energy efficiency of the system is improved, CO2 in flue gas of a steel plant is consumed in the f-CaO grading digestion process, and carbon emission of the steel plant is further reduced.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of steel slag, and in particular relates to a method and system for comprehensive utilization of steel slag waste heat and f-CaO graded digestion. Background technique [0002] The main composition of steel slag is the same as that of common building materials. In theory, using steel slag as concrete admixture or aggregate in building materials can make it be utilized to a certain extent. However, due to the problem of the stability of steel slag, the performance of building materials containing steel slag, especially the volume stability, increases the hidden danger, and the main reason for the poor volume stability of steel slag is due to the f-CaO and f-MgO exist. Therefore, there is a requirement for the content of free calcium oxide in steel slag as a building material, which limits the use of steel slag to a certain extent. Therefore, reducing the content of f-CaO and f-MgO in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C21B3/08
CPCY02W30/50
Inventor 吴志强张榕江马广举杨伯伦张博张杰
Owner XI AN JIAOTONG UNIV
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