Calcium Aluminate Clinker Refractory for Aluminum Cells

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Solution Overview

Problem

Conventional calcium aluminate clinker with high C12A7 content melts at elevated temperatures, limiting its utility as a refractory aggregate due to lack of porosity and increased reactivity, while existing refractory materials fail to effectively trap harmful substances in aluminum production processes.

Innovation Solution

Development of calcium aluminate clinker compositions with reduced C12A7 content and optional barium addition, forming phases like CA6, C3A, and BC2A4, which enhance porosity and resistance to molten aluminum penetration, and serve as a chemical trap for harmful substances, allowing use at elevated temperatures and in chemical processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional calcium aluminate clinker with high C12A7 content is used, then the material has good chemical reactivity, but it melts at elevated temperatures and loses porosity, making it unsuitable as a refractory aggregate

Engineering Contradiction:

Improvechemical protection capabilityVSAvoidmelting temperature

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent changes the chemical composition parameters by reducing C12A7 content from high levels to below 30% (preferably 10-20%), and adjusting CaO and Al2O3 ratios to achieve a composition that resists melting at elevated temperatures while maintaining chemical reactivity for harmful substance trapping

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite clinker material containing multiple phases (C3A, CA, CA2, C12A7, and Al2O3) in specific proportions, where each phase contributes different properties: C3A and CA provide chemical reactivity, while Al2O3 and controlled C12A7 levels provide high-temperature stability and porosity retention

Inventive Principle:

Principle #40Composite materials

2Reliability

If calcium aluminate clinker is used as a refractory aggregate, then it provides chemical protection, but existing materials lack sufficient porosity for effective insulation

Engineering Contradiction:

Improvechemical protectionVSAvoidthermal insulation

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent specifically designs the clinker to contain 10-40% porosity through controlled composition and processing, creating a porous structure that provides thermal insulation while the remaining solid phases (C3A, CA, CA2) maintain chemical protection capabilities against harmful substances

Inventive Principle:

Principle #31Porous materials

3Strength

If barium is added to calcium aluminate clinker, then penetration resistance to molten aluminum is improved, but the material composition becomes more complex

Engineering Contradiction:

Improvepenetration resistanceVSAvoidcomposition complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent incorporates barium at specific local concentrations (0.1-5.0% by weight) within the clinker matrix, creating localized regions of enhanced penetration resistance without uniformly complicating the entire composition, thus maintaining overall compositional simplicity while achieving improved performance

Inventive Principle:

Principle #3Local 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 resulting calcium aluminate clinker provides improved insulation, resistance to penetration, and effective trapping of harmful substances, enabling its use as a refractory aggregate and chemical trap in aluminum production, maintaining structural integrity and safety at elevated temperatures.

Implementation Method 1

these phases, including the C12A7, naturally resist penetration of molten aluminum

Methodology Applied

Scientific EffectPhase resistance to molten penetration: Refractory Material

Implementation Method 2

the shape of the aggregate is rounded making it easier to create a free flowing material. Also, because of the raw materials used to make the product, it tends to form into porous spheres. The porosity of the spheres becomes important if an insulation material, as a final product, is desired

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Implementation Method 3

the applicant believes that this last benefit is via chemical trapping (trapping of a material by reaction with another material)

Methodology Applied

Scientific EffectChemical trapping: Chemical Bonding

Data Source

PatentUS8216435B2Calcium aluminate clinker as a refractory aggregate with and without barium addition and use thereof

Publication Date: 2012.07.10 ALLIED MINERAL PROD LLC

AI summary

A method of providing a safety lining in an industrial processing container, such as an aluminum electrolytic cell, is provided comprising providing a container having an interior and a at least one primary lining in juxtaposition to said interior of said shell, and adding a calcium aluminate clinker and/or castable layer between the primary lining and the shell of the container. Further, a method of trapping one or more gasses, elements or compounds produced from industrial processes is provided using the container having the calcium aluminate layer as herein described. An electrolytic cell is disclosed comprising a shell having an interior, one or more primary linings in juxtaposition to the interior of the shell, and one or more safety linings located between the primary lining and the shell, wherein at least one of the safety linings comprises a calcium aluminate clinker and/or castable.