Preconditioned Resin Aggregate from Mixed Plastic Waste
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Solution Overview
Problem
Existing lightweight aggregates and plastic recycling methods are inefficient and result in a significant portion of plastic waste ending up in landfills, while traditional recycling is costly and difficult due to the complexity of sorting and processing multi-layered, contaminated plastics.
Innovation Solution
A method of converting mixed plastic waste into preconditioned absorptive resin aggregate (PRA) using calcium oxide and/or calcium hydroxide as a preconditioning agent, combined with pozzolans, through hot extrusion and processing to form lightweight construction materials, which can be used in construction, road building, and waste-to-fuel applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional plastic recycling methods are used, then plastic sorting and processing can be performed, but the process is costly and difficult due to the complexity of sorting and processing multi-layered, contaminated plastics
Solution Approach 1:
The invention extracts and removes the problematic multi-layered and contaminated plastic materials from the recycling stream, treating them differently from clean, single-layer plastics. By separating these difficult-to-recycle materials and applying specific preprocessing treatments (mechanical size reduction, thermal drying, chemical treatment), the system makes them suitable for aggregate production without requiring complex sorting infrastructure for all plastic types.
Solution Approach 2:
The invention changes the physical and chemical parameters of contaminated and multi-layered plastics through preprocessing treatments. Mechanical size reduction changes particle size parameters, thermal drying changes moisture content, and chemical treatments alter surface properties. These parameter changes transform unsuitable plastic waste into appropriate feedstock for aggregate manufacturing.
2Loss of substance
If mixed plastic waste is used directly as aggregate, then landfill waste is reduced, but the plastic lacks the necessary mechanical and chemical properties for construction applications
Solution Approach 1:
The invention performs preliminary actions on mixed plastic waste before it can be used as aggregate. Preprocessing steps including mechanical size reduction, thermal drying, and chemical treatment are applied in advance to ensure the plastic waste achieves the necessary mechanical strength, chemical stability, and physical properties required for construction aggregate applications.
Solution Approach 2:
The invention creates composite materials by combining treated plastic waste with binding agents or other materials that enhance mechanical properties. This composite approach allows the use of mixed plastic waste while achieving the strength and durability requirements for construction applications through synergistic material combinations.
3Weight of moving object
If lightweight aggregates are produced from conventional materials, then low density construction materials are available, but environmentally benign and high-value aggregates are not achieved
Solution Approach 1:
The invention converts harmful plastic waste materials into beneficial lightweight aggregate products. By transforming contaminants and waste materials into construction aggregates, the process eliminates environmental harm while creating valuable low-density building materials. The harmful aspect of plastic waste is converted into the beneficial property of lightweight, durable construction aggregate.
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 method effectively transforms low-value plastic waste into a lightweight, environmentally benign aggregate that can be used in construction products, reducing landfill waste and providing a safe, inert feedstock for various industries, while also offering improved mechanical and chemical cohesion in cement products.
Implementation Method 1
treating the supply of granulated mixed plastic waste with a preconditioning agent that comprises, consists or consists essentially of calcium oxide (quicklime or burnt lime) and/or calcium hydroxide (slaked lime)
Implementation Method 2
hot extruding the plastic waste mixture to form an extruded product comprising waste plastic material
Implementation Method 3
cooling the extruded product
Data Source
AI summary
Systems and methods are provided for making aggregate from comingled waste plastics. For example, there is provided a method of making a preconditioned absorptive resin aggregate, the method including: obtaining a supply of granulated mixed plastic waste treated with a preconditioning agent that comprises at least one of calcium oxide and calcium hydroxide; mixing the supply of granulated mixed plastic waste treated with the calcium oxide preconditioning agent with one or more additives to form a plastic waste mixture, the one or more additives comprising pozzolans; hot extruding the plastic waste mixture to form an extruded product comprising waste plastic material; cooling the extruded product; and processing the extruded product to form an aggregate. Products incorporating such aggregates, such as, for example, lightweight construction blocks, are also provided. Also provided are methods of forming a waste plastics feedstock.