Calcium Carbonate Refractory Matrix for Slag Resistance
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Solution Overview
Problem
Refractory structures and linings face mechanical erosion and corrosion from acidic and basic slags, as well as thermal shock, leading to premature failure during metal or metal alloy manufacturing processes.
Innovation Solution
A refractory material composition comprising 20-95% magnesia-based material, 2-10% calcium carbonate, and 0.1-6% binder, which forms a high-density matrix upon heating, providing resistance to slag and molten metal penetration and thermal shock through calcination of calcium carbonate into reactive calcia, enhancing durability and service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If refractory material is applied to protect against mechanical erosion and corrosion, then resistance to slag and molten metal penetration is improved, but the material becomes vulnerable to thermal shock causing premature failure
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating calcium carbonate (2-10 wt%) and magnesium oxide (85-97 wt%) in specific proportions. This compositional parameter change enables the material to form a high-density matrix that simultaneously resists slag penetration and withstands thermal shock, resolving the contradiction between erosion resistance and thermal shock vulnerability
Solution Approach 2:
The patent creates a composite refractory material combining calcium carbonate, magnesium oxide, and binder in a specific matrix structure. This composite formulation leverages the complementary properties of each component: calcium carbonate provides thermal shock resistance through calcination, magnesia provides structural integrity and slag resistance, and the binder holds the matrix together, achieving both protection against mechanical erosion and resistance to thermal shock
2Reliability
If calcium carbonate is added to enhance reactivity with infiltrating slag, then chemical resistance is improved, but particle size selection becomes critical for balancing reactivity and thermal shock resistance
Solution Approach 1:
The patent applies local quality by specifying different particle size ranges for different functional requirements: finer calcium carbonate particles (2-20 mesh) provide higher reactivity with infiltrating slag at the interface, while the overall distribution (2-48 mesh) ensures adequate thermal shock resistance. This localized optimization of particle characteristics within the composite resolves the contradiction between chemical reactivity and thermal shock performance
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 refractory material effectively protects against corrosive materials and thermal shock, extending the service life of refractory structures by forming a high-density matrix that resists slag penetration and molten metal attack, improving physical properties at high temperatures.
Implementation Method 1
Heat from the furnace or vessel which contacts the refractory material on the refractory structure accelerates the hardening and curing of the refractory material of the present invention by transmission of heat to the refractory material
Implementation Method 2
The calcium carbonate in the refractory material is calcined in place upon transfer of the heat from the furnace or vessel which is being processed in the refractory structure to which the refractory material is applied. Carbon dioxide gas evolves therefore after the refractory material is no longer in the plastic state
Data Source
AI summary
The composition applied to the refractory structure has a magnesia-based refractory material, calcia source and a binder. After application of the refractory material to a refractory structure and upon application of heat to the applied refractory material a matrix is formed which protects against penetration of the slag into the refractory material. The resulting refractory material has improved hot strength, slag resistance and durability.