Cold-Setting Refractory Mix with Phosphate Binder for Metallurgical Linings
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Solution Overview
Problem
Existing dry vibratable mixes for metallurgical vessels face issues such as machine abrasion, odor emissions, limited storage capability, and undesirable chemical releases, particularly when using organic or inorganic binders.
Innovation Solution
A refractory dry vibratable mix using magnesium oxide and alkali phosphate as a binder, combined with a carboxylic acid retardant, sets at room temperature upon water addition, forming crystalline potassium magnesium phosphate hexahydrate and annealing-resistant magnesium pyrophosphate upon heating, without the drawbacks of traditional binders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If water glass binder is used in dry vibratable mix, then setting at room temperature is achieved, but machine part abrasion occurs
Solution Approach 1:
The invention changes the chemical composition parameters of the binder system by using inorganic binders (water glass, esters, resin/phosphate combinations) instead of traditional organic binders, enabling cold setting while eliminating the abrasive effects of water glass through proper formulation and dosage control
Solution Approach 2:
The invention introduces esters and phosphate-based binders as intermediary substances that mediate between the need for cold setting and the requirement to prevent machine part abrasion, providing a binding mechanism that does not involve the abrasive properties of pure water glass
2Reliability
If resin binder is used in dry vibratable mix, then setting capability is achieved, but odor and emissions are released
Solution Approach 1:
The invention changes the chemical composition from organic resin binders to inorganic binder systems (water glass, esters, phosphate combinations), fundamentally altering the chemical reaction pathway to eliminate odor and emissions while maintaining setting capability through inorganic binding mechanisms
Solution Approach 2:
The invention converts the potential harm of using any binder (which could cause emissions) into a benefit by selecting inorganic binder systems that not only eliminate emissions but also provide superior setting characteristics and environmental compatibility
3Reliability
If traditional binder systems are used, then setting is achieved, but storage capability is limited
Solution Approach 1:
The invention optimizes the chemical composition parameters of the binder system by using inorganic binders with stable storage properties (water glass, esters, phosphate combinations) that maintain their binding effectiveness over extended storage periods without degradation, unlike traditional organic binders
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 solution provides a stable, odor-free, and storage-stable setting process for metallurgical vessel linings, avoiding machine abrasion and chemical emissions, while maintaining high thermal resistance.
Implementation Method 1
Magnesium oxide and potassium dihydrogen phosphate react by taking in water to form crystalline potassium magnesium phosphate hexahydrate (set product)
Implementation Method 2
The water which is added acts both as a solvent and as a reactant in which it is taken up as water of crystallization
Implementation Method 3
Beyond approximately 1000° C., this is converted into magnesium phosphate
Data Source
AI summary
The invention relates to a refractory dry vibratable mix which sets at room temperature when water is added, for use in metallurgical vessels and comprising a refractory main component, a binder and a retarder.