Asphalt Shingle Recycling via Mechanical Size Reduction and Density Separation
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Solution Overview
Problem
Current methods for recycling residential roofing products, such as asphalt shingles, face challenges with viscosity issues in recycled asphalt shingle blending, environmental impact due to landfill space occupation, and the need for chemical additives or processes that can be hazardous, such as explosions.
Innovation Solution
A progressive method involving mechanical reduction, screening by size and density, and beneficiation to separate and extract raw materials from asphalt shingles, producing a final ultrafine asphalt powder product less than 300 microns in size with a mean size of less than 150 microns, without the use of chemicals or additives, utilizing techniques like hammermill crushing and density separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical extraction methods are used to recover asphalt from shingles, then extraction efficiency is improved, but safety risks increase due to potential explosions
Solution Approach 1:
The patent replaces chemical extraction methods with a mechanical system consisting of a hammermill crusher and density separator. The hammermill mechanically reduces shingle material to particles smaller than 300 microns with a mean size of less than 150 microns, and the density separator uses gravity-based separation to recover asphalt without chemical reactions, thereby eliminating explosion risks while maintaining extraction efficiency
Solution Approach 2:
The patent changes the physical parameters of the shingle material through mechanical reduction, achieving particle sizes less than 300 microns with a mean size of less than 150 microns. This parameter change enables effective asphalt recovery through density separation without requiring chemical extraction, thus improving safety while maintaining productivity
2Reliability
If additives are used to rejuvenate old asphalt, then asphalt performance is improved, but process complexity increases
Solution Approach 1:
The patent extracts and recovers original asphalt from shingles through mechanical reduction and density separation without adding any rejuvenating additives. The process obtains clean asphalt material directly from the shingle composite, eliminating the need for additional chemical substances and simplifying the overall process while maintaining asphalt performance
Solution Approach 2:
The patent enables the shingle material to serve itself by recovering its original asphalt component through mechanical means. The density separator naturally separates asphalt from other shingle components based on density differences, allowing the asphalt to be recovered in its original state without requiring external additives or complex rejuvenation processes
3Ease of manufacture
If shingles are landfilled, then disposal is simplified, but environmental impact worsens due to landfill space occupation and slow decomposition
Solution Approach 1:
Instead of discarding shingles in landfills, the patent recovers valuable materials including asphalt, fiberglass, and mineral particles through mechanical reduction and density separation. This recovery process converts waste material into reusable resources, eliminating environmental harm while maintaining operational simplicity
Solution Approach 2:
The patent segments the shingle composite material into its constituent components through mechanical reduction to particles smaller than 300 microns and subsequent density separation. This segmentation allows each material component (asphalt, fiberglass, minerals) to be separately recovered and reused, transforming a single waste stream into multiple valuable resources
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 effectively recycles asphalt shingles into reusable raw materials, reducing environmental impact by minimizing landfill use and avoiding chemical hazards, while producing a high-asphalt-content product suitable for new roofing shingles and paving mixes, enabling the reuse of materials in various applications.
Implementation Method 1
separating the medium aggregate products by density, wherein the density separation results in the formation of reusable clean granules, fractured granule powder, and asphalt coated limestone powder
Data Source
AI summary
This invention relates to a progressive method of separating and extracting raw materials from residential roofing products for re-use as ingredients for asphalt and fiberglass related products, including roofing materials. The method includes reduction, separation, beneficiation and extraction of raw materials. The resulting products are alternative roofing granules, asphalt coated limestone, limestone, recycled asphalt and recycled fiberglass strand powders.