SrO-Modified Binder for Monolithic Refractory Erosion Resistance
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Solution Overview
Problem
Conventional binders for monolithic refractories, such as alumina cement, exhibit insufficient high-temperature erosion resistance and rapid degradation when exposed to molten iron or slag, leading to increased erosion loss and reduced durability, which is inadequate for the stringent conditions in modern steel production processes.
Innovation Solution
A binder comprising a mixture of Ca x Sr 1-x Al 2 O 4 , Ca y Sr 1-y Al 4 O 7 , and 12(CaO) z (SrO) 1-z ·7Al 2 O 3 , with Al 2 O 3 blended in specific proportions, forming a solid solution that enhances high-temperature stability and erosion resistance by increasing the melting point and hydraulic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional alumina cement is used as a binder for monolithic refractories, then the refractory can be easily manufactured and installed, but the erosion resistance at high temperature becomes insufficient
Solution Approach 1:
The invention changes the chemical composition parameters of the binder by incorporating SrO (strontium oxide) in addition to CaO (calcium oxide) and Al2O3 (alumina). This compositional parameter change results in the formation of new mineral phases with different properties, specifically improving high-temperature erosion resistance while maintaining binding strength through the synergistic effect of the modified chemistry.
Solution Approach 2:
The invention creates a composite binder system combining CaO-Al2O3-SrO components that interact to form a complex mineralogical structure. The composite nature of this binder, with multiple phases including strontium-containing compounds, provides both the necessary binding strength for manufacturing and enhanced erosion resistance at high temperatures, resolving the contradiction between these two requirements.
2Duration of action of stationary object
If alumina cement is used as a binder, then the monolithic refractory can be produced with adequate initial strength, but the service life at high temperature becomes insufficient due to rapid degradation
Solution Approach 1:
The invention performs preliminary action by incorporating SrO into the binder composition before the refractory is exposed to high-temperature service conditions. This pre-modification of the binder chemistry ensures that the mineral phases formed during initial setting and early heating provide both adequate binding strength and pre-established resistance to thermal degradation, extending service life without sacrificing initial strength.
Solution Approach 2:
By changing the chemical composition parameters of the binder to include SrO, the invention modifies the thermal stability and phase transformation behavior of the binder system. This parameter change ensures that the binder maintains its binding strength over extended periods at high temperature, thereby extending service life while preserving the necessary mechanical properties.
3Reliability
If conventional binders are used, then the manufacturing process is simple, but the high-temperature stability becomes insufficient leading to increased erosion loss
Solution Approach 1:
The invention modifies the binder composition parameters by adding SrO to the conventional CaO-Al2O3 system. This parameter change leads to the formation of Sr-containing mineral phases that provide superior high-temperature stability. The increased stability compensates for the slightly more complex composition, as the SrO can be incorporated using similar manufacturing processes while delivering significantly improved performance at elevated temperatures.
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 proposed binder significantly improves the erosion resistance and service life of monolithic refractories, allowing them to maintain strength and integrity under high-temperature conditions, extending their service life and enhancing durability in industrial kiln environments.
Implementation Method 1
A binder which comprises a mixture of Ca x Sr 1-x Al 2 O 4 , Ca y Sr 1-y Al 4 O 7 , and 12(CaO) z (SrO) 1-z ·7Al 2 O 3 into which Al 2 O 3 is blended
Data Source
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AI summary
A binder for monolithic refractories characterized by containing ingredients comprised of a chemical composition of at least one of CaxSr1-xAl2O4, and CaySr1-yAl4O7 or these plus 12(CaO)z(SrO)1-z·7Al2O3 (where, 0<x<1, 0<y<1, and 0<z<1) and a binder for monolithic refractories and monolithic refractories superior in erosion resistance to slag or molten iron by monolithic refractories comprised of this binder and refractory aggregates are provided.