Calcium Hexa Aluminate Refractory Linings for Alkali Environments
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Solution Overview
Problem
Existing refractory materials fail to effectively resist chemical attack and maintain structural integrity in high alkali/alkaline environments, particularly at elevated temperatures, leading to erosion and wear in industrial processes.
Innovation Solution
A method utilizing a calcium hexa aluminate (CA6) composition as a refractory aggregate with specific particle size distribution and potential barium substitution, forming a durable chemical barrier and refractory that resists alkali and alkaline attack, suitable for use in high-temperature environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional refractory materials (e.g., mullite) are used in high alkali/alkaline environments, then the initial structural integrity is maintained, but chemical wear and erosion occur over time, reducing operational lifespan
Solution Approach 1:
The invention changes the chemical composition parameters of the refractory aggregate by using calcium hexa aluminate (CA6) with specific Al2O3 content (50-90 wt%) and CaO content (10-50 wt%), which fundamentally alters the material's resistance to alkali/alkaline chemical attack compared to traditional mullite materials
Solution Approach 2:
The invention employs a composite refractory composition consisting of CA6 aggregate combined with binding phases (calcium aluminate cement, hydratable alumina, or ceramic bonding), creating a multi-phase material system that provides both chemical resistance and structural integrity in high alkali environments
2Object-affected harmful factors
If refractory materials are designed for high chemical resistance, then erosion resistance improves, but manufacturing complexity increases due to specific particle size distribution requirements and composition control
Solution Approach 1:
The invention specifies precise particle size distribution parameters for CA6 aggregate (ranging from fine powders to coarse particles) and chemical composition parameters (Al2O3: 50-90 wt%, CaO: 10-50 wt%), which standardizes the manufacturing process while achieving optimal erosion resistance
Solution Approach 2:
The invention applies different particle size fractions of CA6 aggregate in specific zones or combinations within the refractory structure, optimizing local chemical resistance properties while maintaining overall structural integrity
Data Source
AI summary
A method for improving the insulating character/and or penetration resistance of a surface comprising lining a surface of a lime kiln, a cement kiln, a roasting kiln, a thermal oxidizer, or a fluidized bed reactor that is subject to wear by an alkali environment and/or an alkaline environment with a refractory composition comprising a refractory aggregate consisting essentially of a calcium hexa aluminate clinker having the formula CA6, wherein C is equal to calcium oxide, wherein A is equal to aluminum oxide, and wherein the hexa aluminate clinker has from zero to less than about fifty weight percent C12A7, and wherein greater than 98 weight percent of the calcium hexa aluminate clinker having a particle size ranging from −20 microns to +3 millimeters, for forming a liner of the surface.