Ceramic Firing Pressure Control for Carbonate Decomposition
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Solution Overview
Problem
The production of ceramic goods from raw materials containing carbonate results in significant carbon dioxide emissions during firing, particularly due to the decomposition of carbonates, which is environmentally detrimental and necessitates transportation of low-carbonate clayey materials from distant deposits to avoid these emissions.
Innovation Solution
Firing the raw materials at a pressure of at least 2 bar increases the decomposition temperature of carbonates, reducing or avoiding CO2 emissions and allowing the use of high-carbonate local deposits, thereby minimizing transportation-related emissions and enabling environmentally friendly production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional atmospheric pressure firing is used, then the firing process is simple and energy-efficient, but significant carbon dioxide is released from carbonate decomposition
Solution Approach 1:
The patent applies parameter changes by increasing the pressure during the firing process from conventional atmospheric pressure to at least 2 bar. This pressure change fundamentally alters the thermal decomposition behavior of carbonates, raising their decomposition temperature and preventing CO2 release during the firing cycle, thus eliminating the harmful emissions while maintaining process simplicity
2Object-generated harmful factors
If low-carbonate clayey materials from distant deposits are transported, then carbon dioxide emissions from firing are reduced, but transportation-related carbon dioxide emissions increase
Solution Approach 1:
The patent converts the previously harmful high-carbonate content of local deposits into a beneficial feature. By using pressure-controlled firing, the harmful carbonate decomposition is prevented, transforming the high-carbonate local materials into suitable firing feedstock. This eliminates the need to transport low-carbonate materials from distant deposits, thereby eliminating transportation emissions while utilizing local resources
3Loss of energy
If high-carbonate local deposits are used, then transportation emissions are eliminated, but conventional firing causes excessive carbonate decomposition and CO2 release
Solution Approach 1:
The patent applies parameter changes by increasing the pressure during the firing process from conventional atmospheric pressure to at least 2 bar. This pressure change fundamentally alters the thermal decomposition behavior of carbonates, raising their decomposition temperature and preventing CO2 release during the firing cycle, thus eliminating the harmful emissions while maintaining process simplicity
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 reduces or eliminates carbon dioxide emissions during the firing of ceramic goods, enabling the sustainable use of high-carbonate local deposits and eliminating the need for transporting low-carbonate materials, thus reducing overall environmental impact.
Implementation Method 1
the decomposition temperature of carbonates also increases with increasing pressure
Data Source
AI summary
In a process for producing ceramic ware from carbonate-containing blanks, it is proposed that the carbonate-containing blanks be fired at least temporarily at a pressure of at least 2 bar in one firing step.