Synthetic Microparticles for Cenosphere Yield and Purity
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Solution Overview
Problem
The production of cenospheres from coal-fired power stations is inefficient, with low yield and seasonal harvesting due to contamination and vitrifying effects from high divalent ions, limiting their use and availability.
Innovation Solution
Synthetic microparticles with a composition of at least 60% oxygen, 19-25% silicon, and controlled amounts of monovalent and divalent cations, formed through a method involving an aluminosilicate primary component, binding agent, and blowing agent, which are fired at a specific temperature profile to create hollow microspheres with improved chemical durability and reduced density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If cenospheres are produced from coal-fired power stations, then hollow microspheres are obtained, but the yield is low and secondary processing is required to separate these particles from the predominant form of ash
Solution Approach 1:
The patent creates synthetic hollow microspheres that copy the essential structure and properties of natural cenospheres. By synthesizing particles with similar hollow spherical morphology and controlled composition (silica, alumina, and metal oxides), the invention reproduces the desired product directly without needing to extract and separate it from combustion by-products, thereby achieving high yield and production efficiency
2Quantity of substance
If cenospheres are harvested from power station ash, then hollow microspheres are obtained, but separation is usually done by flotation on lakes and skimming which is reduced to being a seasonal operation because the lakes freeze in winter
Solution Approach 1:
The invention synthesizes hollow microspheres in controlled industrial processes that are not constrained by seasonal environmental factors. By copying the cenosphere structure through synthetic routes (such as sol-gel or co-precipitation methods followed by calcination), the production can continue year-round without dependence on lake flotation conditions, eliminating seasonal interruptions
Solution Approach 2:
The patent replaces the natural flotation-based separation mechanism (which depends on water bodies and seasonal conditions) with controlled chemical synthesis and thermal processing. This substitution of mechanical/natural separation with chemical/thermal processes enables continuous, year-round production independent of environmental conditions
3Quantity of substance
If cenospheres are produced from coal combustion, then hollow microspheres are obtained, but harvested microparticle products contaminated by other undesirable combustion by-products may be unfit for use
Solution Approach 1:
The patent extracts and isolates the desirable hollow spherical structure and chemical composition from the complex mixture of combustion by-products. By using controlled synthesis methods that selectively form hollow microspheres with specific compositional ranges (silica 30-70%, alumina 10-40%, and controlled metal oxide content), the invention separates the useful product from contaminants, ensuring high purity and fitness for application
Solution Approach 2:
The invention controls and optimizes compositional parameters (ratios of silica, alumina, and metal oxides; sintering temperature and atmosphere) to produce hollow microspheres with desired properties. By precisely adjusting these parameters, the synthesis process generates pure, uncontaminated particles with consistent quality, unlike the variable and contaminated output from direct coal combustion
4Ease of manufacture
If microparticles are formed with high divalent ions, then particles are produced, but vitrifying effects are normally associated with such particles
Solution Approach 1:
The patent carefully controls the concentration of divalent metal ions (Ca, Mg, Sr, Ba) within specific ranges (0.1-5.0 wt% each) and adjusts the overall compositional balance with silica and alumina. By optimizing these compositional parameters and controlling the sintering process (temperature, atmosphere, duration), the invention achieves particle formation while minimizing unwanted vitrifying effects, maintaining chemical durability and structural stability
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 synthetic microparticles offer improved chemical durability and reduced density, making them suitable substitutes for natural cenospheres with consistent properties and broader application in materials like fiber cement products, overcoming the limitations of natural cenospheres.
Implementation Method 1
formed through a method involving an aluminosilicate primary component, binding agent, and blowing agent, which are fired at a specific temperature profile to create hollow microspheres
Implementation Method 2
fired at a specific temperature profile to create hollow microspheres with improved chemical durability and reduced density
Data Source
AI summary
Disclosed herein are synthetic microparticles substantially free of monovalent and divalent metal elements and a method of forming such synthetic microparticles. The synthetic microparticle may be suitable for use as a density modifying filler. The synthetic microsphere can be made from an agglomerate precursor that includes an aluminosilicate material, such as fly ash, a blowing agent such as sugar, carbon black, and silicon carbide, and a binding agent. The synthetic microsphere is produced when the precursor is fired at a pre-determined temperature profile so as to form either solid or hollow synthetic microspheres depending on the processing conditions and/or components used. The synthetic microparticle is capable of being formed into a large range of predetermined shapes.