Flue Gas CO2 Mineralized Lightweight Aggregate Without High-Temperature Curing
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Solution Overview
Problem
Current methods for preparing green building materials from industrial solid wastes lack the ability to optimize the internal structure of aggregates, limiting their CO2 absorption and mineralization capabilities, and often involve high-temperature curing that can damage the structure and increase environmental pollution.
Innovation Solution
A method involving pre-curing, mineralization curing, and assisted hardening curing is employed to regulate the internal structure of aggregates, using a flow that includes calculating raw material ratios, pre-treatment, granulation, pre-curing, carbon dioxide mineralization, and assisted hardening, optimizing the structure to enhance CO2 absorption and mineralization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-temperature curing is used to accelerate the carbonization reaction, then the reaction rate is improved, but the structure and comprehensive quality of the building materials deteriorate and secondary pollution is generated
Solution Approach 1:
The patent changes the temperature parameter from high-temperature curing to normal temperature carbonization, and introduces pressure as a new parameter to accelerate the reaction rate. This resolves the contradiction by achieving fast reaction speed without high temperature damage through parameter substitution and optimization.
Solution Approach 2:
The patent replaces thermal energy (heat) with mechanical energy (pressure) to drive the carbonization reaction. By using high-pressure CO2 environment instead of high temperature, the reaction rate is accelerated without causing structural damage or secondary pollution associated with high-temperature curing.
2Ease of manufacture
If solid wastes and base materials are directly blended and mineralized, then the production process is simplified, but the internal structure optimization of aggregates is limited and CO2 absorption capability is insufficient
Solution Approach 1:
The patent applies preliminary actions including grinding solid wastes to fine powder, screening to uniform particle size, and pre-mixing with base materials before mineralization. These preliminary steps optimize the internal structure of aggregates, creating a configuration that maximizes CO2 absorption capability while maintaining production efficiency.
Solution Approach 2:
The patent optimizes the local quality of aggregate internal structure by controlling particle size distribution, shape, and arrangement through grinding and screening processes. This localized structural optimization enhances the overall CO2 absorption capability without requiring complex production processes.
3Object-affected harmful factors
If normal temperature carbonization is used to avoid structural damage and pollution, then the building material quality is maintained, but the carbonization reaction rate is slow
Solution Approach 1:
The patent makes the CO2 environment serve multiple functions: it provides the carbon source for mineralization and simultaneously acts as a high-pressure medium to accelerate the reaction. This multi-functionality allows normal temperature carbonization to achieve both structural preservation and fast reaction rate.
Solution Approach 2:
The patent employs periodic action through staged pressure application and multi-stage curing processes. By controlling CO2 pressure in stages and combining with appropriate curing periods, the reaction rate is accelerated while maintaining structural integrity and avoiding pollution.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively increases the CO2 absorption and mineralization capabilities of the aggregates, reduces environmental pollution, and improves the overall quality of the building materials by avoiding high-temperature curing and utilizing waste incineration flue gas for CO2 curing.
Implementation Method 1
The basic mechanism of carbon dioxide mineralization is that CO2 reacts with oxide/hydroxide of alkaline or alkaline-earth metals (e.g. Ca and Mg and the like) to generate carbonate minerals (e.g. CaCO3 and MgCO3 and the like) with stable physical and chemical properties
Implementation Method 2
pouring the solid waste powder, dihydrate gypsum and gel material into a granulator, mixing uniformly at a first rotation speed, and then taking a part of the mixture, and then at a second rotation speed, stirring the remaining mixture with a proper amount of deionized water sprayed until spherical kernels are formed
Implementation Method 3
placing the aggregate in a drying oven with constant temperature and humidity to perform hydration reaction
Implementation Method 4
placing the hydrated aggregate into a baking oven to dry and remove water in pores
Implementation Method 5
placing the ceramic granules into a reaction kettle, introducing a combustion flue gas containing CO2 for mineralization reaction under a given condition of temperature, humidity and pressure
Data Source
AI summary
A method of preparing a high-performance green building material based on combustion flue gas carbon dioxide mineralization, including: calculating a raw material ratio; taking each industrial solid waste material to obtain a solid powder; pouring the solid powder, dihydrate gypsum and gel material into a granulator, mixing uniformly, and then taking a part of the mixture, and then stirring the remaining mixture with deionized water sprayed until spherical kernels are formed, uniformly adding the previously-taken part of mixture to prepare an aggregate; performing hydration reaction on the aggregate; drying the hydrated aggregate to prepare spherical ceramic granules; placing the ceramic granules into a reaction kettle and introducing a combustion flue gas containing CO2 for mineralization reaction, and taking out reacted ceramic granules and putting into drying oven for drying to prepare a cold-bonded lightweight aggregate; supplementing water to the lightweight aggregate to perform hydration reaction and obtain a finished product.