Ceramic Mix Reducing Crystalline Free Silica
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Solution Overview
Problem
Ceramic articles manufactured with traditional mixes contain high levels of crystalline free silica, which is a carcinogen, posing health risks and lacking effective methods to reduce its content.
Innovation Solution
A ceramic mix comprising a frit with silicon dioxide, calcium or magnesium oxide, aluminum oxide, flux materials like tectosilicates, and binding materials like phyllosilicates, without kaolinitic clay, that reacts at temperatures above 600°C to form a ceramic article with less than 1% crystalline free silica, utilizing a process involving grinding, hydration, pressing, drying, and firing to achieve a safe and strong product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional ceramic mixes are used, then ceramic articles can be manufactured with standard mechanical properties, but crystalline free silica content becomes high posing health risks
Solution Approach 1:
The patent changes the chemical composition parameters of the ceramic mix by replacing kaolinitic clay with specific combinations of clays (ball clay, kaolin, kaolinitic clay in controlled amounts), feldspars, and quartz. This parameter modification enables the formulation of mixes that produce ceramic articles with crystalline free silica content reduced to less than 1% while maintaining required mechanical properties through optimized ingredient ratios and firing conditions
Solution Approach 2:
The patent employs composite material formulation by combining multiple clay types (ball clay, kaolin, kaolinitic clay), feldspars (orthoclase, microcline, analcime), and quartz in specific proportions. This composite approach creates a synergistic effect where the combination of materials produces ceramic articles with reduced crystalline free silica content while preserving mechanical strength and other essential properties
2Object-affected harmful factors
If crystalline free silica content is reduced to below 1%, then health safety is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-formulating the ceramic mix composition with optimized ratios of clays, feldspars, and quartz before manufacturing. The mix is prepared in advance with precise ingredient quantities designed to produce less than 1% crystalline free silica upon firing, eliminating the need for complex post-production adjustments and simplifying the overall manufacturing process
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 significantly reduces crystalline free silica content to below 1% in ceramic articles, making them safer for human health while maintaining mechanical strength and aesthetic properties.
Implementation Method 1
These temperatures cause chemical reactions between the components of the mix, including decomposition reactions and phase transitions
Implementation Method 2
Firing is a fundamental operation in the technological process of manufacturing ceramic articles as it determines the formation of the ceramic material, transforming the raw materials of the mix into new crystalline and vitreous compounds
Implementation Method 3
the firing processes of ceramic mixes consist of heat treatments at temperatures above 600° C.
Data Source
AI summary
A mix for the manufacture of ceramic articles comprising at least two of the following components a frit comprising silicon dioxide present in a concentration by weight, evaluated with respect to the total weight of the frit, comprised between 30% and 75%; calcium oxide or magnesium oxide present in a concentration by weight, evaluated with respect to the total weight of the frit, comprised between 0.01% and 50%; aluminum oxide, present in a concentration by weight, evaluated with respect to the total weight of the frit, comprised between 0.01% and 30%; one or more flux materials comprising tectosilicates; one or more binding materials comprising phyllosilicates.