Ceramsite from Sludge and Seashells for Heavy Metal Adsorption
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Solution Overview
Problem
Current methods for producing ceramsite using seashell powder are either costly, have limited wastewater treatment effectiveness, or lack sufficient strength and bio-immobilization efficiency, while discarded seashells contribute to environmental pollution.
Innovation Solution
A ceramsite is produced using a mixture of river/lake/sea sludge and seashell powder, with specific proportions of kaolin, peat ash, siliceous shale, furnace slag, fly ash, zeolite, and peat, which are pulverized, mixed, granulated, and calcined to create a material with excellent adsorption performance and sewage treatment capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If seashell powder is used as raw material for ceramsite production, then environmental pollution from discarded shells is reduced, but the production cost increases and treatment effectiveness on heavy metal wastewater is limited
Solution Approach 1:
The patent combines seashell powder with multiple auxiliary materials including clay, peat ash, siliceous shale, furnace slag, fly ash, zeolite, and peat to create a composite ceramsite material. This composite approach enhances the treatment effectiveness for heavy metal wastewater while maintaining the environmental benefit of utilizing discarded shells. The synergistic combination of materials provides both structural integrity and enhanced adsorption capacity.
Solution Approach 2:
The patent optimizes the proportion of seashell powder within the range of 15-50 parts by weight and controls the water content of sludge at 45-60%. These parameter optimizations ensure that the ceramsite achieves both cost-effectiveness and reliable treatment performance for heavy metal removal while utilizing discarded shell resources.
2Reliability
If sludge is used as raw material for ceramsite production, then wastewater treatment capability is improved, but the production cost increases
Solution Approach 1:
The patent optimizes the water content parameter of sludge to 45-60% and controls the proportion of sludge at 10-30 parts by weight. These parameter optimizations balance the wastewater treatment capability with production cost considerations, ensuring that the ceramsite is both effective and cost-effective to produce.
Solution Approach 2:
The patent creates a composite material system that combines sludge with various auxiliary materials (clay, peat ash, siliceous shale, furnace slag, fly ash, zeolite, peat) to enhance wastewater treatment capability while controlling production costs through optimized material proportions.
3Strength
If high temperature sintering is used to produce ceramsite, then the strength and bio-immobilization efficiency are improved, but the energy consumption increases
Solution Approach 1:
The patent employs a composite material formulation containing multiple auxiliary materials that facilitate sintering at optimized temperatures. The combination of clay, peat ash, siliceous shale, furnace slag, fly ash, zeolite, and peat creates a material system that achieves sufficient strength and bio-immobilization efficiency at lower energy costs compared to traditional high-temperature sintering of single-material systems.
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 ceramsite effectively adsorbs heavy metals and harmful substances, reducing pollution, and can be used as a building material, offering a cost-effective and environmentally friendly solution for sewage treatment and waste management.
Implementation Method 1
The ceramsite has good sewage treatment effect, and is especially suitable for adsorption of heavy metal substances
Implementation Method 2
The ceramsite is achieved by granulating and sintering the above raw materials at a high temperature
Implementation Method 3
pulverized, mixed, granulated, and calcined to create a material with excellent adsorption performance
Data Source
AI summary
A ceramsite produced by using a river/lake/sea sludge and seashell powder as raw materials and a preparation method thereof are provided. The ceramsite is made of the following raw materials in parts by weight: 15-50 parts of shell powder, 5-15 parts of kaolin, 1-5 parts of peat ash, 15-30 parts of siliceous shale, 15-40 parts of furnace slag, 10-20 parts of fly ash, 15-40 parts of zeolite, 10-30 parts of river/lake/sea sludge, and 10-25 parts of peat. The shell powder is pulverized to a particle size of 60-200 mesh in fineness. A content of silica in the siliceous shale is 87.0%-89.5%. The preparation method of the ceramsite includes the following steps: taking raw materials, pulverizing, stirring, granulating, calcining, and naturally cooling, so as to obtain the ceramsite.