A Process for Coupling Acidification and Carbonization Modified Steel Slag

A technology of steel slag modification, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of low carbonation reaction rate, severe comprehensive treatment of steel slag, high pressure and other problems, and achieve the elimination of volume stability Sexuality problems, elimination of poor volume stability, and the effect of increasing the reaction rate

Active Publication Date: 2022-05-27
SHANDONG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the current research uses the direct carbonation reaction of steel slag, and there are the following problems: (1) The reaction conditions are harsh, requiring higher CO 2 (2) The carbonation reaction rate is low, and the f-CaO and f-MgO in the steel slag cannot be effectively eliminated through the carbonation reaction, which leads to the failure to promote and apply the steel slag carbonation technology, and the comprehensive treatment of steel slag has become increasingly serious.

Method used

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  • A Process for Coupling Acidification and Carbonization Modified Steel Slag
  • A Process for Coupling Acidification and Carbonization Modified Steel Slag
  • A Process for Coupling Acidification and Carbonization Modified Steel Slag

Examples

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Effect test

Embodiment 1

[0073] A process for coupling acidification and carbonization to modify steel slag:

[0074] (1) The steel slag particles are transported into the acidification and carbonization coupling reaction unit. For details of the equipment number, please refer to figure 2 , enter the reaction chamber 9 through 1, add circulating water into the reaction device through 6, set the liquid-solid ratio at 5:1 to control the amount of water added, start the motor 7 to drive the stirring shaft 8 with a spiral blade to move, and pass the acetic acid in batches. The solid acetic acid was added to the feed port 3, and after stirring and reacting for 20 minutes, tributyl phosphate was added through the tributyl phosphate feed port 4, and at the same time, CO containing CO was sprayed through the lime kiln flue gas nozzle 10. 2 The flue gas from the lime kiln was controlled at 0.1MPa, and ethanolamine (5%) was added in batches through the ethanolamine feed port 5 to increase the CO 2 Solubility ...

Embodiment 2

[0078] A process for coupling acidification and carbonization to modify steel slag:

[0079] (1) The steel slag particles are transported into the acidification and carbonization coupling reaction unit. For details of the equipment number, please refer to figure 2 , which enters the reaction chamber 9 through 1, the circulating water is added to the reaction device through 6, the liquid-solid ratio is set at 20:1 to control the amount of water added, the motor 7 is started to drive the stirring shaft 8 with a spiral blade to move, and the acetic acid is passed in batches. The solid acetic acid was added to the feed port 3, and after stirring and reacting for 60 minutes, tributyl phosphate was added through the tributyl phosphate feed port 4, and at the same time, the CO containing CO was sprayed through the lime kiln flue gas nozzle 10. 2 The flue gas from the lime kiln was controlled at 2MPa, and ethanolamine (20%) was added in batches through the ethanolamine feed port 5 to...

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Abstract

The invention belongs to the technical field of resource utilization of metallurgical solid waste, and in particular relates to a modified steel slag coupled with acidification and carbonization and its preparation process and application. The process is specifically: using acetic acid, tributyl phosphate, ethanolamine, NaOH and Ca(OH) 2 Emulsion as reaction enhancer, enriched with CO in lime kiln 2 The steel slag is modified together with flue gas. The process for modifying steel slag by coupling acidification and carbonization provided by the present invention has simple reaction conditions and does not require high-pressure CO 2 At the same time, it can greatly increase the carbonation reaction rate and effectively eliminate f-CaO and f-MgO in steel slag.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of metallurgical solid waste, and particularly relates to an acidification and carbonization coupled modified steel slag and a preparation process and application thereof. Background technique [0002] The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] Steel production is CO 2 One of the main industries that emits, according to the principle of mineral carbonation, the use of lime kilns rich in CO 2 The carbonation pretreatment of the steel slag by the flue gas can not only play the role of carbon fixation, but also improve the performance of the steel slag. However, the direct carbonation reaction of steel sla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/02C04B18/14
CPCC04B20/023C04B18/142C04B20/02Y02W30/91C21B2400/02C21B3/04C04B7/425C04B18/141C04B5/06C04B7/17C21C7/0087
Inventor 常景彩王勇梁晓杰王鹏李蜀生马春元刘衍卉
Owner SHANDONG UNIV
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