Method for preparing building materials by integrated absorption-mineralization of CO2 in exhaust gas

The method of preparing building materials by integrating CO2 absorption and mineralization in waste gas solves the problems of high energy consumption, high cost and low product purity in existing technologies, and realizes efficient and stable CO2 capture and building material preparation, expanding the applicability of waste gas types.

CN118164782BActive Publication Date: 2026-07-21SHANDONG IRON & STEEL CO LTD
View PDF 5 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANDONG IRON & STEEL CO LTD
Filing Date
2024-03-11
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing CO2 capture and mineralization technologies suffer from high energy consumption, high cost, low product purity, and poor applicability. In particular, the performance of carbonization curing products is unstable due to uneven CO2 concentration and mismatched flow rates in multi-source exhaust gases.

Method used

An integrated CO2 absorption-mineralization method is adopted in the waste gas. CO2 is absorbed by amine to form a rich liquid, which is then combined with high calcium and magnesium minerals and solid waste for pressing and molding. Liquid phase carbonization curing is then carried out to prepare negative carbon building materials, blocking harmful gases from entering the carbonization curing chamber and using liquid phase absorbents to buffer changes in flue gas.

Benefits of technology

It achieves low-cost and high-efficiency CO2 capture and mineralization, with the product being a high-value building material. The product quality is stable, the process is simplified, the applicability of waste gas types is expanded, and energy consumption and environmental pollution are reduced.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN118164782B_ABST
    Figure CN118164782B_ABST
Patent Text Reader

Abstract

The application discloses a method for preparing building materials by integrating CO2 absorption and mineralization in waste gas, wherein in the absorption tower, the amine method is used for CO2 capture by taking waste gas as the CO2 source to form CO2-rich liquid, and the ultra-low concentration CO2 can be quickly captured. In the desorption tower, high calcium and magnesium minerals and solid waste are used as raw materials, the CO2-rich liquid is used for curing, and high-value carbon-negative building materials are prepared, and the low-cost and efficient desorption and regeneration of the CO2 absorbent are realized. The CO2-lean liquid in the desorption tower is recycled to the absorption tower for CO2 capture, so that the raw material cost of the absorbent and the pollution to the environment are greatly reduced. The method can block harmful gases (such as CO and CH4) from entering the carbonization curing chamber, effectively solves the problem of poor applicability of multi-source waste gas due to different compositions, greatly expands the types of waste gas for technical application, effectively alleviates the problem of difficulty in regulating the macroscopic and microscopic performance of the carbonization curing product caused by different CO2 concentrations of the waste gas, different CO2 flow rates and mineralization rates, and ensures the stable production of the carbon-negative building materials.
Need to check novelty before this filing date? Find Prior Art