Solid Waste Porous Material for Coal Gangue Hill Restoration
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Solution Overview
Problem
Existing methods for ecological restoration of coal gangue hills face challenges in maintaining a healthy ecosystem and promoting plant growth due to difficulties in sustaining fungal growth and forming a conducive substrate.
Innovation Solution
The development of solid waste-based porous materials composed of coal gangue powder, fly ash, cement, desulfurization gypsum, and a foaming agent, processed through granulation and flue gas curing, which are then mixed with low-rank coal and organic matter, and used in conjunction with mycorrhizal agents to create a fertile substrate for plant growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional substrate methods are used for ecological restoration, then initial plant coverage can be achieved, but long-term fungal growth and ecosystem formation are difficult to sustain
Solution Approach 1:
The patent utilizes porous materials formed by flue gas curing of granulated coal gangue, fly ash, and other solid wastes. The porous structure created during curing provides adequate air circulation and moisture retention, creating an optimal environment for fungal growth and ecosystem development while maintaining substrate stability over time.
Solution Approach 2:
The substrate is formulated as a composite material containing coal gangue powder (40-80%), fly ash (0-40%), cement (5-20%), desulfurization gypsum (0-10%), and lime (0-5%). This composite composition combines the advantages of different materials to provide structural stability, nutrient content, and appropriate porosity for sustaining fungal growth and promoting ecosystem formation.
2Object-affected harmful factors
If solid waste materials are used to create substrate, then natural resources are conserved and pollution is reduced, but the substrate quality may be insufficient for plant growth
Solution Approach 1:
The patent converts harmful solid wastes (coal gangue, fly ash) into beneficial substrate materials through flue gas curing. The curing process transforms these waste materials into a stable, porous structure that provides excellent growth conditions for plants and fungi, thereby eliminating pollution while creating high-quality substrate.
Solution Approach 2:
The flue gas curing process induces parameter changes in the solid waste materials, including pore structure formation, strength development, and chemical composition optimization. These parameter changes transform the raw waste materials into a substrate with appropriate physical and chemical properties for supporting plant growth.
3Strength
If flue gas curing is used to process solid waste particles, then material strength and porosity are improved, but curing time and energy consumption increase
Solution Approach 1:
The flue gas curing process utilizes waste flue gas from industrial sources to cure the substrate materials. This self-service approach uses otherwise wasted thermal energy and chemical components to accelerate the curing process, reducing both time and energy consumption while improving material strength and porosity.
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 approach enhances soil structure, promotes plant growth, and supports long-term mycorrhizal activity, leading to effective ecological restoration of coal gangue hills while reducing environmental pollution and the need for natural restoration materials.
Implementation Method 1
0.7-3‰ of a foaming agent
Implementation Method 2
The boiler flue gas may include acid gas such as carbon dioxide, sulfur dioxide, nitrogen dioxide, etc., which may be used to cure and neutralize the alkaline substance in the material, so that pH of the obtained porous material is lowered to neutral
Implementation Method 3
adding 40-80% of coal gangue powder, 0-40% of fly ash, 5-20% of cement, 0-10% of desulfurization gypsum, and 0-5% of lime into a granulator or a screening granulator, preparing particles with 1-8 mm of particle size in the granulator or screening granulator
Data Source
AI summary
The present disclosure relates to the field of ecological restoration of a coal gangue hill, and in particular, to a solid waste-based porous material, a method for preparing the solid waste-based porous material, and a method of ecological restoration of the coal gangue hill by applying the solid waste-based porous material. A coal-based solid waste restoration material and mycorrhizal solid bacterial agent are mixed to restore the coal gangue hill, the coal-based solid waste restoration material is prepared by mixing coal-based solid waste porous materials, low-rank coal, and waste organic matter and adding a microbial quickly decomposition agent for aerobic fermentation and standing.