Carbon Dioxide Fixing Sludge Fine Powder Production
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Solution Overview
Problem
Existing methods for utilizing sludge fine powder as a binder in concrete face challenges such as reduced workability and limited carbon dioxide fixation, making it difficult to effectively replace cement and reduce carbon dioxide emissions.
Innovation Solution
A method to produce carbon dioxide fixing sludge fine powder by subjecting a sludge cake from residual or returned concrete to crushing-drying under hot air and highly concentrated carbon dioxide, ensuring a high unhydrated cement content and improved workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If sludge fine powder is used as a binder to replace cement, then carbon dioxide emissions are reduced, but workability (fluidity) of the slurry decreases
Solution Approach 1:
The patent applies parameter changes by controlling the specific surface area of sludge fine powder within 3,000 to 15,000 cm²/g and adjusting the replacement ratio of cement to 10-50% to optimize both carbon dioxide emission reduction and workability maintenance
Solution Approach 2:
The patent creates a composite binder system combining sludge fine powder with remaining cement and admixtures, where the composite material achieves both environmental benefits and operational performance
2Ease of manufacture
If sludge fine powder is produced by conventional drying methods, then production cost is reduced, but unhydrated cement content decreases due to hydration reactions
Solution Approach 1:
The patent applies preliminary action by adding water-reducing admixtures and protective coatings to sludge fine powder before drying and storage, preventing hydration reactions in advance while maintaining low production costs
Solution Approach 2:
The patent uses water-reducing admixtures and protective coatings as intermediaries between the sludge fine powder and water, preventing unwanted hydration reactions while allowing controlled reactivity when needed
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 resulting carbon dioxide fixing sludge fine powder acts as an effective binder, reducing carbon dioxide emissions while maintaining or improving the workability of concrete, thus offering a low-carbon alternative for cement replacement.
Implementation Method 1
subjecting a sludge cake to a predetermined treatment... crushing-drying under hot air
Implementation Method 2
subjecting a sludge cake to a predetermined treatment... highly concentrated carbon dioxide... fix carbon dioxide in the fine powder
Data Source
AI summary
A production method of carbon dioxide fixing sludge fine powder as a low-carbon binder. Water is added to residual concrete or returned concrete to form it into a slurry, gravel and sand are separated and removed therefrom, fine sand is separated and removed from the sludge water by a wet cyclone to obtain concentrated sludge water, and the concentrated sludge water is dehydrated to obtain a sludge cake. The sludge cake is put into a rotary drum, hot air and highly concentrated carbon dioxide are supplied into the rotary drum, the carbon dioxide is fixed and is crushed and dried to obtain carbon dioxide fixing sludge fine powder. Alternatively, the sludge cake is crushed and fractured to obtain sludge fine powder. This sludge fine powder is exposed to highly concentrated carbon dioxide to obtain carbon dioxide fixing sludge fine powder.