Cement Clinker Cooling Profile for Lightness at Lower Burning Temperature
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Solution Overview
Problem
Existing cement clinker production methods face challenges in achieving equivalent color tone to conventional Portland cement clinkers while reducing burning temperatures for energy-saving, and existing solutions either fail to provide sufficient lightness or increase production costs.
Innovation Solution
Control the cooling temperature and time duration by annealing cement clinker at a rate of 20°C or lower from 1300 to 1200°C and then quenching from 1000°C to produce cement clinker with 22 to 40% C3A and C4AF, an iron modulus of 0.8 to 1.3, and a Blaine specific surface area of 2800 to 4500 cm²/g, thereby adjusting lightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the burning temperature is reduced to save energy, then energy consumption decreases, but the lightness of the cement clinker deteriorates
Solution Approach 1:
The patent changes the cooling parameters (cooling rate and holding temperature) to control the lightness of cement clinker. Specifically, cooling at a rate of 5-50°C/min to a holding temperature of 800-1000°C, then holding for 5-60 minutes before quenching, produces clinker with L values of 45-55, solving the lightness problem while maintaining low burning temperatures of 1200-1400°C.
Solution Approach 2:
The patent applies preliminary cooling treatment (annealing) before the final quenching step. This preliminary action of controlled cooling and holding allows the formation of specific mineral phases that determine the lightness property, ensuring the desired L value is achieved before the clinker is fully cooled.
2Temperature
If the Fe2O3 content is increased to enable lower temperature burning, then burning temperature decreases, but the lightness of the cement clinker deteriorates
Solution Approach 1:
The patent changes the cooling parameters (cooling rate and holding temperature) to control the lightness of cement clinker. Specifically, cooling at a rate of 5-50°C/min to a holding temperature of 800-1000°C, then holding for 5-60 minutes before quenching, produces clinker with L values of 45-55, solving the lightness problem while maintaining low burning temperatures of 1200-1400°C.
3Use of energy by stationary object
If the C4AF content is increased to reduce burning temperature, then energy consumption decreases, but the lightness of the cement clinker deteriorates
Solution Approach 1:
The patent changes the cooling parameters (cooling rate and holding temperature) to control the lightness of cement clinker. Specifically, cooling at a rate of 5-50°C/min to a holding temperature of 800-1000°C, then holding for 5-60 minutes before quenching, produces clinker with L values of 45-55, solving the lightness problem while maintaining low burning temperatures of 1200-1400°C and high C4AF content.
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 allows for lower temperature burning, increased use of waste products, and equivalent lightness to conventional cement clinkers, while maintaining desirable strength properties.
Implementation Method 1
annealing the raw materials after the burning at a cooling rate of 20 degree Celsius or lower at least to 1200 degree Celsius and then quenching the raw materials from at lowest 1000 degree Celsius
Implementation Method 2
quenching the raw materials from at lowest 1000 degree Celsius
Data Source
AI summary
Portland cement clinker that includes C3A and C4AF in total from 22 to 40 mass % calculated by Bogue's formulas and has an iron modulus (I.M.) of 0.8 to 1.3 is produced. The burned raw materials are annealed at a cooling rate of 20 degree Celsius or lower at least to 1200 degree Celsius so that the lightness of the cement clinker is made high. When annealing till lower temperatures, the lightness value becomes generally higher, but the effect becomes negligible lower at 1000 degree Celsius. Therefore, the raw materials are quenched at 1000 degree Celsius and lower for improving the productiveness.