Cube-like ZnSnO3 Composite Coated with Graphitized Fine Ash
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Solution Overview
Problem
The management and utilization of fine ash, a by-product from coal gasification, pose environmental pollution challenges due to its limited application, necessitating a method for its safe and effective utilization.
Innovation Solution
A cube-like ZnSnO3 composite coated with highly graphitized fine ash is prepared through a three-step acidification method and hydrothermal reaction, resulting in a material with adjusted dielectric and conductivity properties for improved impedance matching and microwave absorption performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fine ash is simply dumped, then disposal is easy, but environmental pollution occurs
Solution Approach 1:
The patent converts the harmful fine ash waste into a beneficial microwave absorption material by coating ZnSnO3 particles with fine ash and graphitic carbon. The fine ash, which would otherwise pollute the environment, is transformed into a functional shell that enhances electromagnetic wave absorption performance through dielectric loss and impedance matching.
2Ease of manufacture
If fine ash is used as microwave absorption material without modification, then utilization is simple, but absorption performance is insufficient
Solution Approach 1:
The patent creates a composite structure where ZnSnO3 particles are coated with fine ash and graphitic carbon layers. This composite design combines the dielectric properties of ZnSnO3 with the carbon-rich fine ash shell, achieving synergistic enhancement of microwave absorption through multiple mechanisms including dielectric loss, conductivity loss, and impedance matching.
Solution Approach 2:
The patent modifies the physical and chemical parameters of fine ash through high-temperature treatment (1000-1500°C) to increase its carbon content and graphitization degree. This parameter change transforms the fine ash into a material with optimized dielectric properties and conductivity, significantly enhancing its microwave absorption capability.
3Device complexity
If ZnSnO3 is prepared without fine ash coating, then synthesis is simpler, but dielectric loss capability and impedance matching are weaker
Solution Approach 1:
The patent performs preliminary preparation of fine ash by collecting and drying it before the main coating process. This preliminary action ensures the fine ash is ready for coating, making the subsequent synthesis process more efficient and the final composite material more effective in enhancing dielectric loss and impedance matching.
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 ZnSnO3@fine ash composite exhibits strong dielectric loss capability and broadband microwave absorption, with a maximum reflection loss of −47.8 dB and effective absorption bandwidth of 7.0 GHz, suitable for electromagnetic wave absorption applications.
Implementation Method 1
preparing the fine ash by adopting a three-step acidification method
Implementation Method 2
mixing with hydrochloric acid solution in a container, stirring and filtering
Implementation Method 3
ultrasonically dispersing for 20-40 min
Implementation Method 4
synthesizing a ZnSnO3@fine ash composite
Implementation Method 5
dropwise adding ammonia into the mixed solution and magnetically stirring until the pH value of the mixed solution is 12, heating the mixed solution
Implementation Method 6
the prepared composite reveals a good impedance matching performance and an improved MA performance
Implementation Method 7
application of a cube-like ZnSnO3 composite coated with highly graphitized fine ash prepared according to the above method in microwave absorption
Data Source
AI summary
A preparation method of a cube-like ZnSnO3 composite coated with highly graphitized fine ash comprises steps: S1: with the gasified fine slag of pulverized coal as a raw material, preparing the fine ash by adopting a three-step acidification method; and S2: adding the fine ash prepared in the S1 into a container filled with distilled water, ultrasonically dispersing for 20-40 min, adding equal molar masses of SnCl4·5H2O and (Zn(NO3)·6H2O respectively, uniformly stirring, dropwise adding ammonia into the mixed solution and magnetically stirring until the pH value of the mixed solution is 12, heating the mixed solution, washing the product obtained with deionized water and ethanol for 2-4 times, and finally drying to obtain a ZnSnO3@fine composite. With the dielectric property and conductivity adjusted, the composite prepared reveals a good impedance matching performance and an improved MA performance.