Inductive Plasma Silica Microsphere Manufacturing
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Solution Overview
Problem
Conventional methods for manufacturing silica microspheres result in low silica purity, difficulty in heat treating high-purity materials, and poor energy/material balance, leading to reduced yield, non-uniform particle size, and increased impurities.
Innovation Solution
A process involving the injection of silica microsphere precursors into an inductive plasma, doped with hydrocarbons, to form high-purity silica microspheres with controlled temperature and energy flux, allowing for enhanced silica enrichment and homogenization of particle size and structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional burner heat treatment is used, then silica microspheres can be manufactured, but silica purity remains low requiring additional chemical treatment
Solution Approach 1:
The patent replaces the conventional mechanical/chemical burner-based heat treatment system with an inductive plasma heating system. This substitution enables direct high-temperature heating (above 1600°C) that achieves high silica purity (>95%) in a single step, eliminating the need for subsequent chemical dealkalization treatments and thereby reducing process complexity while improving manufacturing precision.
Solution Approach 2:
The patent changes the temperature parameter from conventional burner ranges (1500-1750°C) to inductive plasma ranges (above 1600°C, potentially up to 2000°C). This parameter change enables complete melting and spheroidization of silica particles with high purity, achieving the desired silica content (>95%) directly without requiring additional chemical treatment steps.
2Temperature
If conventional burner is used for heat treatment, then particles can be heated, but high-purity base materials with higher melting points cannot be effectively treated
Solution Approach 1:
The patent raises the temperature parameter from conventional burner capabilities (1500-1750°C) to inductive plasma capabilities (above 1600°C, potentially 2000°C). This temperature increase enables effective heat treatment of high-purity silica and quartz materials with higher melting points, achieving complete melting, spheroidization, and high silica purity (>95%) that cannot be obtained with conventional burners.
3Productivity
If conventional burner process is used, then heat treatment can be performed, but energy and material balance are poorly controlled leading to waste
Solution Approach 1:
The inductive plasma system enables precise control of temperature and energy input through electromagnetic field coupling with the silica particles. This feedback-controlled heating process optimizes energy utilization, reduces energy waste, and improves material yield by achieving complete transformation at controlled temperatures, unlike conventional burners with poor energy balance control.
Solution Approach 2:
Replacing the conventional burner with inductive plasma heating provides superior energy efficiency through direct electromagnetic coupling with the material. This substitution eliminates energy losses associated with conventional combustion and heat transfer, achieving better energy and material balance with reduced waste and improved productivity.
4Manufacturing precision
If conventional burner process is used, then silica microspheres can be produced, but particle size uniformity is poor and silica nanoparticles are generated
Solution Approach 1:
The patent uses inductive plasma to achieve uniform heating at temperatures above 1600°C, enabling complete melting and controlled spheroidization of silica particles. This controlled high-temperature process produces uniform microsphere sizes while preventing the formation of unwanted silica nanoparticles, improving manufacturing precision and eliminating harmful byproducts compared to conventional burner processes.
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 process achieves silica microspheres with greater than 95% purity, improved mechanical strength, and uniformity, enabling their use in high-temperature applications while reducing health risks and energy waste.
Implementation Method 1
injecting at least one silica microsphere precursor into an inductive plasma
Implementation Method 2
into an inductive plasma, said inductive plasma being preferably doped with a hydrocarbon
Implementation Method 3
The degree of silica purity of the silica microspheres obtained by the process according to the invention, which depends on the degree of silica purity of the precursor
Implementation Method 4
said inductive plasma being preferably doped with a hydrocarbon, such as propane or methane
Data Source
AI summary
The invention concerns silica microspheres (M) having an outer diameter between 50 and 125 μm, preferably between 60 and 90 μm, a wall thickness not less than 1 μm, preferably between 1 and 3 μm and a density between 0.3 and 0.7/cm3, a manufacturing method by injecting silica microsphere precursors (MS, PR1, PR1′, PR2′) into an inductive plasma (P), assembly methods and possible uses of silica microspheres.