Hot Aluminosilicate Waste Mixing for Shaped Articles
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Solution Overview
Problem
Existing processes for producing cementitious materials from fly ash often result in products with insufficient compressive strength, resistance to acid attack, or longevity, limiting their suitability for construction applications.
Innovation Solution
A process that involves mixing freshly produced aluminosilicate-containing particulate waste material with a metal oxide, an alkali, a water soluble silicate, and water before it cools to ambient temperature, shaping the mixture, and curing it to produce shaped articles with enhanced physical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fly ash is allowed to cool to ambient temperature before mixing, then it becomes easier to handle and process, but its reactivity is significantly decreased requiring more other components
Solution Approach 1:
The invention performs the mixing operation before the fly ash cools to ambient temperature, taking advantage of its higher reactivity state. This preliminary action captures the window of opportunity when the material is most reactive, before the crust forms and reactivity decreases, thereby reducing the quantity of additional components needed.
Solution Approach 2:
The invention changes the temperature parameter of the fly ash by utilizing it in a hot state rather than allowing it to cool. This parameter change (maintaining elevated temperature) directly affects the chemical reactivity of the aluminosilicate minerals, enabling reduced component quantities while achieving the same product properties.
2Ease of operation
If fly ash is allowed to cool to ambient temperature before mixing, then it becomes easier to process, but the production efficiency is reduced due to longer mixing and curing times
Solution Approach 1:
The invention changes the temperature parameter from ambient to elevated, which accelerates the chemical reactions during mixing and curing. This parameter change reduces the time required for these processes, thereby improving production efficiency despite the slightly increased complexity of handling hot material.
Solution Approach 2:
The mixing operation is performed preliminarily while the fly ash is still hot and reactive, before cooling occurs. This timing strategy reduces subsequent curing time and accelerates the overall production cycle, improving productivity.
3Ease of operation
If fly ash is allowed to cool to ambient temperature before mixing, then it becomes easier to handle, but the reactivity of the aluminosilicate minerals is significantly decreased
Solution Approach 1:
The invention performs the critical mixing operation preliminarily while the fly ash maintains high reactivity due to its elevated temperature. This timing ensures that the aluminosilicate minerals are fully reactive before cooling reduces their reactivity, thereby maintaining reliable and consistent product properties.
Solution Approach 2:
The invention maintains the temperature parameter at an elevated level during mixing to preserve the reactivity of the aluminosilicate minerals. This parameter control ensures reliable chemical reactions and product formation, overcoming the handling difficulties of hot material through process design.
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 increases the reactivity of the waste material, reducing the required amounts of other components by up to 50% and potentially shortening mixing and curing times, resulting in shaped articles with comparable or superior physical properties to those made with Portland cement.
Implementation Method 1
mixing the waste material into a mixture, wherein the mixture comprises the aluminosilicate, a metal oxide, an alkali, a water soluble silicate and water... whereby the shaped article is produced
Implementation Method 2
before the waste material cools to ambient temperature
Data Source
Figure 1
Figure 2
AI summary
Disclosed herein is a method and an apparatus for producing a shaped article. The method comprises obtaining a freshly produced aluminosilicate-containing particulate waste material and, before the waste material cools to ambient temperature, mixing the waste material into a mixture, wherein the mixture comprises the aluminosilicate, a metal oxide, an alkali, a water soluble silicate and water; shaping the mixture; and curing the shaped mixture, whereby the shaped article is produced.