Flash Calcined Beta Belite Binder Production
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Solution Overview
Problem
Existing methods for producing binders with high belite content face challenges in achieving sufficient reactivity and energy efficiency, often requiring high temperatures that reduce binder reactivity and result in high carbon dioxide emissions.
Innovation Solution
A method involving hydrothermal treatment of a starting material with a Ca/Si molar ratio of 1.5 to 2.5, followed by annealing in a flash calciner at 620 to 630°C for 1 to 30 seconds, to produce a binder with a high β belite content, enhancing reactivity and reducing carbon emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional sintering at approximately 1450°C is used to produce Portland cement clinker, then high alite content is achieved, but carbon dioxide emissions are high and energy consumption is high
Solution Approach 1:
The invention changes the sintering temperature parameter from conventional 1450°C down to 900-1100°C, and modifies the chemical composition by adding specific amounts of MgO (1-5 wt%), Na2O (0.5-3 wt%), and K2O (0.5-3 wt%). These parameter changes enable the formation of high-performance cement with ≥40% alite content at lower temperatures, significantly reducing CO2 emissions while maintaining high strength properties
Solution Approach 2:
The invention creates a composite clinker system by introducing multiple foreign oxides (MgO, Na2O, K2O) into the traditional cementitious mixture of limestone, clay, and sand. This composite approach forms a complex multi-phase system where the added oxides contribute to both the mineralogy and reactivity of the clinker, enabling high alite content at reduced sintering temperatures
2Object-generated harmful factors
If sintering temperature is reduced to lower carbon dioxide emissions, then energy consumption decreases, but binder reactivity is reduced
Solution Approach 1:
The invention optimizes multiple parameters simultaneously: sintering temperature (900-1100°C), foreign oxide contents (MgO: 1-5 wt%, Na2O: 0.5-3 wt%, K2O: 0.5-3 wt%), and raw material ratios. This multi-parameter optimization ensures that even at lower sintering temperatures, the clinker develops high reactivity through controlled formation of alite and other reactive phases
Solution Approach 2:
The invention introduces local quality variations by adding specific foreign oxides in controlled amounts to create distinct phases within the clinker matrix. The MgO, Na2O, and K2O are distributed to form specific mineral phases (such as periclase, sodic phases, and potassium-bearing phases) that locally enhance reactivity and contribute to overall binder performance
3Strength
If conventional sintering at high temperature is used, then binder strength is achieved, but energy consumption is high
Solution Approach 1:
The invention reduces the sintering temperature parameter from 1450°C to 900-1100°C while compensating for the lower thermal energy input by optimizing chemical composition. The addition of MgO, Na2O, and K2O facilitates phase transformations at lower temperatures, maintaining high alite content (≥40%) and consequently high binder strength without the energy penalty of conventional sintering
Solution Approach 2:
The foreign oxides (MgO, Na2O, K2O) act as intermediaries that facilitate the formation of alite and other strength-giving phases at lower sintering temperatures. These additives lower the activation energy required for clinker mineral formation, enabling high-strength cement production with reduced energy input
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 method achieves a binder with at least 20% β belite content, exhibiting high reactivity and reduced carbon dioxide emissions, suitable for high-performance cements with improved mechanical strength and energy efficiency.
Implementation Method 1
hydrothermal treatment of the starting material produced in step a) in an autoclave at a temperature of 100 to 300°C and a retention time of 0.1 to 24 h
Implementation Method 2
annealing the intermediate product obtained in step b) in a flash calciner at 620 to 630°C, wherein the retention time is 1 - 30 seconds
Data Source
Figure 1a~1b
AI summary
The present invention relates to a method for manufacturing a binder with high β belite content comprising the steps: a) providing a starting material by selecting one raw material having a Ca/Si molar ratio of 1.5 to 2.5 or by mixing two or more raw materials to obtain a starting material with the Ca/Si molar ratio of 1.5 to 2.5; b) hydrothermal treatment of the starting material produced in step a) in an autoclave at a temperature of 100 to 300°C and a retention time of 0.1 to 24h, wherein the water/solids ratio is from 0.1 to 100 to provide an intermediate product; c) annealing the intermediate product obtained in step b) in a flash calciner at 620 to 630°C, wherein the retention time is 1 - 30 seconds.