Air-Stream Mill for Thermally Insulating Silica Mixtures
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Solution Overview
Problem
Existing methods for producing thermally insulating mixtures result in low throughput, high handling complexity, and high manufacturing costs due to separate grinding and mixing processes, leading to inefficient production and high capital requirements.
Innovation Solution
A continuous method using an air-stream mill to introduce a premixed stream of silica and opacifier particles with a carrier gas for grinding and mixing, followed by separation and classification, allowing for high throughput and improved mixing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate grinding and mixing processes are used, then manufacturing manageability is improved, but throughput decreases and handling complexity increases
Solution Approach 1:
The patent combines grinding and mixing operations into a single air-stream mill unit. The air-stream mill performs both functions simultaneously by introducing particles into a high-velocity air stream where they are ground against each other and mixed through turbulent flow, eliminating the need for separate grinding and mixing equipment and operations.
Solution Approach 2:
The air-stream mill serves multiple functions within a single device: it grinds particles, mixes materials, and can perform classification. This multi-functional approach replaces what would traditionally require separate specialized equipment for each operation, improving throughput while maintaining manufacturing manageability.
2Adaptability or versatility
If separate grinding and mixing units are used, then process flexibility is improved, but plant use increases and manufacturing costs rise
Solution Approach 1:
By merging grinding and mixing into one air-stream mill unit, the patent reduces the number of separate pieces of equipment required in the plant. This consolidation decreases plant complexity and capital requirements while the air-stream mill itself maintains flexibility through adjustable operating parameters.
Solution Approach 2:
The air-stream mill achieves process flexibility through parameter adjustments such as air flow rate, particle feed rate, and mill configuration rather than requiring multiple specialized devices. This allows the single unit to adapt to different production requirements without increasing plant complexity.
3Manufacturing precision
If intensive separate grinding and mixing are performed, then mixture quality is improved, but manufacturing time increases and productivity decreases
Solution Approach 1:
The air-stream mill performs grinding and mixing in a continuous process where particles are constantly introduced, ground, and mixed in a continuous air stream. This eliminates the batch-to-batch transitions and idle times associated with separate sequential operations, maintaining high mixture quality while significantly improving productivity.
Solution Approach 2:
The air-stream mill performs preliminary grinding and mixing actions simultaneously as particles enter the system, rather than requiring sequential intensive processing steps. The turbulent air stream immediately begins both grinding and mixing actions, reducing total processing time while achieving adequate mixture quality.
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 method achieves high throughput and improved thermally insulating properties with reduced manufacturing costs and complexity, enabling the production of pulverulent mixtures with enhanced thermal insulation capabilities.
Implementation Method 1
a premixed stream comprising a carrier gas, silica particles and opacifier particles is introduced into an fine impact mill
Implementation Method 2
ground and mixed therein, after which the solid is separated from the gas stream, wherein the fine impact mill is an air-stream mill
Implementation Method 3
The mode of operation of an air-stream mill, in which particles are picked up by a carrier gas stream, set in turbulent motion and ground by collision of the particles with one another
Implementation Method 4
ground and mixed therein, after which the solid is separated from the gas stream
Implementation Method 5
ground by collision of the particles with one another and collision with the components of the mill
Implementation Method 6
A subsequent classifier zone separates fine product from coarse product, and the coarse product is returned continuously to the lower grinding zone
Implementation Method 7
The air-stream mill may be provided with a downstream filter cyclone, in which a classifier system may optionally be integrated, which separates the air from the product produced
Data Source
AI summary
A method for continuous production of a thermally insulating mixture comprising silica particles and opacifier particles, in which a premixed stream comprising a carrier gas, silica particles and opacifier particles is introduced into a fine impact mill, ground and mixed therein, after which the solid is separated from the gas stream, wherein the fine impact mill is an air-stream mill comprising grinding tracks arranged one above the other on a rotatable shaft.