Concrete Sludge Carbonation for Low-Energy CO2 Fixation
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Solution Overview
Problem
Existing carbon dioxide fixation technologies for concrete sludge are inefficient and costly, requiring complex processes and significant energy consumption, and do not effectively utilize the calcium components in concrete sludge for carbon dioxide adsorption.
Innovation Solution
A carbon dioxide fixation apparatus that adds water to concrete sludge, removes aggregates, and introduces a carbon dioxide-containing gas to react with calcium components at normal temperature and pressure, producing a composite powder with fixed carbon dioxide without the need for heating or additional energy sources, using a simple process that includes water addition, gas supply, and natural dewatering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional carbon dioxide fixation technologies are used for concrete sludge, then calcium components can react with carbon dioxide to produce calcium carbonate, but the process requires significant energy consumption and complex operations
Solution Approach 1:
The concrete sludge itself serves as the reaction medium and calcium source, eliminating the need for external energy input. The natural calcium hydroxide in the sludge reacts with carbon dioxide at ambient conditions, making the system self-sufficient and energy-free
Solution Approach 2:
The invention changes the reaction parameters from conventional high-temperature and high-pressure conditions to ambient temperature and pressure. This parameter change enables the reaction to proceed spontaneously without external energy input while maintaining high carbon dioxide fixation efficiency
2Quantity of substance
If conventional carbon dioxide fixation technologies are used for concrete sludge, then calcium carbonate can be produced, but the process is costly and complex
Solution Approach 1:
The invention extracts and utilizes the calcium hydroxide component already present in concrete sludge, eliminating the need for complex preprocessing steps. By directly using the sludge as-is, the process complexity is dramatically reduced while maintaining calcium carbonate production efficiency
Solution Approach 2:
The concrete sludge serves multiple functions simultaneously: it is the raw material, the reaction medium, and the calcium source. This self-service approach eliminates the need for separate processing equipment and complex operational procedures required by conventional methods
3Productivity
If conventional carbon dioxide fixation technologies are used, then carbon dioxide can be fixed, but the efficiency is low and waste generation is high
Solution Approach 1:
The invention converts concrete sludge, which is typically discarded as waste, into a valuable carbon dioxide fixation medium. What was previously harmful waste material becomes the key resource driving high-efficiency carbon dioxide capture, simultaneously solving waste management and carbon fixation problems
Solution Approach 2:
Instead of discarding concrete sludge, the invention recovers and utilizes its calcium hydroxide content for carbon dioxide fixation. This recovery approach transforms waste into a functional material, achieving both waste reduction and high-efficiency carbon capture
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 apparatus efficiently produces a composite powder with fixed carbon dioxide at a lower cost, achieving high carbon dioxide fixation rates and large-scale production, while reducing energy consumption and waste generation, and the produced powder can be used as a carbon dioxide adsorbent and filler material.
Implementation Method 1
water addition part for adding water to cement paste sludge, which is concrete sludge from which coarse aggregate and fine aggregate have been removed, with stirring
Implementation Method 2
supply part for supplying a carbon dioxide-containing gas to the first intermediate to obtain a second intermediate... calcium components in concrete sludge (cement slurry) generated in the concrete production process to react with carbon dioxide to obtain calcium carbonate
Implementation Method 3
water drain part for draining water from the second intermediate to produce powder containing precipitated calcium carbonate... natural dewatering
Data Source
AI summary
To provide a carbon dioxide fixation apparatus and a method for fixing carbon dioxide, which can inexpensively fix carbon dioxide and also can inexpensively produce powder having carbon dioxide fixed therein in large quantities. The carbon dioxide fixation apparatus includes water addition means for adding water to concrete sludge from which coarse aggregate and fine aggregate have been removed with stirring, supply means for supplying a carbon dioxide-containing gas to a first intermediate which has passed through the water addition means, and water drain means for draining water from a second intermediate which has passed through the supply means to produce powder containing precipitated calcium carbonate, which is calcium carbonate crystals, cement carbonatized powder in which calcium components in cement particles are carbonatized on the surface of the cement particles, and unreacted cement particles.