Carbon Dioxide Capture Using Steelmaking Slag Particles

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Solution Overview

Problem

Current carbon dioxide capture technologies in the steel industry have low carbon fixation efficiency and require additional pretreatment or modification, making them costly and inefficient.

Innovation Solution

A method involving particles containing magnesium oxide, calcium oxide, or a combination thereof, which are contacted with a mixture gas containing water vapor, carbon dioxide, and nitrogen oxide, to capture carbon dioxide and form carbonated particles, optimizing conditions such as relative humidity, nitrogen oxide concentration, and temperature.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional carbon dioxide capture technologies are used, then carbon dioxide can be captured, but carbon fixation efficiency is low and additional pretreatment or modification is required

Engineering Contradiction:

Improvecarbon fixation efficiencyVSAvoidpretreatment and modification requirements

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent uses steelmaking slag directly as the carbonation substrate without requiring additional pretreatment or modification. The slag naturally contains calcium oxide and magnesium oxide which react with carbon dioxide, eliminating the need for external preparation steps and reducing system complexity while maintaining high carbon fixation efficiency

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent optimizes reaction parameters including temperature (20-100°C), pressure (1-1.8 atm), relative humidity (25-95%), and gas composition (CO2 concentration 0.05-15%, nitrogen oxide 20-2000 ppm) to maximize carbonation efficiency of the steelmaking slag, transforming the reaction conditions to achieve high productivity without complex equipment

Inventive Principle:

Principle #35Parameter changes

2Reliability

If additional pretreatment or modification is applied to capture carbon dioxide, then capture capability is improved, but cost increases

Engineering Contradiction:

Improvecarbon dioxide capture capabilityVSAvoidcost of capture

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent utilizes steelmaking slag, an industrial waste byproduct, as the carbonation substrate. This inexpensive material effectively captures carbon dioxide without requiring costly pretreatment or modification, achieving reliable capture capability while minimizing costs by using a readily available, low-cost material

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent converts steelmaking slag, which is typically a waste byproduct requiring disposal, into a valuable carbonation substrate. This transforms a harmful environmental waste stream into a beneficial resource for carbon dioxide capture, reducing both disposal costs and capture costs simultaneously

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Ease of manufacture

If steelmaking slag is used directly as the particle, then cost decreases and environmental impact is reduced, but carbonation efficiency must be optimized

Engineering Contradiction:

Improvecost and environmental impactVSAvoidcarbonation efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent optimizes carbonation efficiency by controlling reaction parameters: temperature (20-100°C), pressure (1-1.8 atm), relative humidity (25-95%), and gas composition (CO2 concentration 0.05-15%, nitrogen oxide 20-2000 ppm, sulfur dioxide 20-500 ppm). These parameter adjustments maximize the reactivity of steelmaking slag with carbon dioxide, achieving high productivity without requiring costly material modifications

Inventive Principle:

Principle #35Parameter changes

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 achieves a higher carbonation efficiency, reduces the cost of carbon dioxide capture, and allows for the direct use of steelmaking slag as the particle, further decreasing costs and environmental impact.

Implementation Method 1

the particle captures the carbon dioxide to form a carbonated particle

Methodology Applied

Scientific EffectCarbonation reaction: Chemical Bonding

Implementation Method 2

the mixture gas includes water vapor... the particle captures the carbon dioxide to form a carbonated particle

Methodology Applied

Scientific EffectHydration: Mineral Hydration

Implementation Method 3

the mixture gas includes... nitrogen oxide... the particle captured at the different CO2 concentration of tail gas includes... magnesium nitrite, calcium nitrite

Methodology Applied

Scientific EffectChemical reaction with nitrogen oxide: Chemical Bonding

Data Source

PatentEP4556102A1Method of capturing carbon dioxide

Publication Date: 2025.05.21 IND TECH RES INST

AI summary

A method of capturing carbon dioxide, including providing a particle containing magnesium oxide, calcium oxide, or a combination thereof; and providing a mixture gas to contact the particle, wherein the mixture gas includes water vapor, carbon dioxide, and nitrogen oxide, and the particle captures the carbon dioxide to form a carbonated particle and a treated gas. The mixture gas has a relative humidity of 25% to 95%, a nitrogen oxide concentration of 20 ppm to 2000 ppm, and a carbon dioxide concentration of 0.05% to 15%.