Slag Bed Calcium Extraction for High-Purity CO2 Fixation
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Solution Overview
Problem
Existing methods for fixing carbon dioxide using alkaline earth metal-containing substances result in decreased purity due to fine powder generation and require complex operations, limiting applications and efficiency.
Innovation Solution
A method involving the circulation of a solvent containing a polyol compound through a slag layer formed by charging slag with calcium, where the solvent is circulated at a velocity that prevents the slag layer from flowing, followed by aeration with carbon dioxide and solid-liquid separation to inhibit fine powder generation and enhance purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If agitation is performed to mix the alkaline earth metal-containing substance in the aqueous solution, then calcium extraction efficiency is improved, but fine powder of the slag is generated causing decreased purity
Solution Approach 1:
The patent replaces mechanical agitation with a chemical extraction system where the aqueous solution flows through a column containing the alkaline earth metal-containing substance. Calcium is extracted by chemical reaction as the solution percolates through the bed, eliminating mechanical stirring that generates fine powder. This substitution of mechanical mixing with chemical extraction in a flow-through system resolves the contradiction between extraction efficiency and purity maintenance.
Solution Approach 2:
The patent uses hydraulic flow of the aqueous solution through the slag layer in a column configuration. The solution is circulated through the bed by pressure-driven flow, allowing calcium extraction without mechanical agitation. This hydraulic system enables efficient mass transfer and calcium extraction while preventing fine powder generation, thus resolving the technical contradiction.
2Reliability
If agitation and aeration are performed in different reaction containers, then calcium extraction and carbon dioxide fixation can be performed, but operational complexity increases
Solution Approach 1:
The patent combines calcium extraction and carbon dioxide fixation into a single integrated column operation. The aqueous solution extracts calcium from the slag layer in the column, then the same column is used for aeration with carbon dioxide to precipitate calcium carbonate. This merging of extraction and fixation steps into one continuous process in a single column reduces operational complexity while maintaining process reliability.
Solution Approach 2:
The patent implements a continuous cyclic operation where the aqueous solution continuously flows through the slag layer for extraction, then the same solution is aerated with CO2 in the same column for carbonate precipitation. The solution is reused in continuous cycles, maintaining continuous useful action without requiring separate batch operations in multiple containers, thus reducing complexity while ensuring reliable process operation.
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
This method efficiently extracts calcium from slag, allowing for high-purity carbon dioxide fixation and carbonate production, reducing operational complexity and costs.
Implementation Method 1
circulating a solvent containing a polyol compound through a slag layer formed by charging slag containing calcium in a container
Implementation Method 2
aerating, with a gas containing carbon dioxide, a calcium extract obtained by passage of the solvent through the slag layer
Implementation Method 3
fixing carbon dioxide to a calcium extract extracted by the extraction method
Implementation Method 4
separating, by solid-liquid separation, a precipitate precipitated from a mixed solution obtained in the aerating
Data Source
AI summary
A method for fixing carbon dioxide may include: circulating a solvent containing a polyol compound through a slag layer formed by charging slag containing calcium in a container; aerating, with a gas containing carbon dioxide, a calcium extract obtained by passage of the solvent through the slag layer in the circulating; and separating, by solid-liquid separation, a precipitate precipitated from a mixed solution obtained in the aerating. In the circulating, the solvent may be circulated at a velocity at which the slag layer does not flow.