Cement Clinker Low-Temperature Sintering Composition
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Solution Overview
Problem
The challenge is to produce a cement clinker with enhanced physical properties while reducing the sintering temperature below conventional levels without using mineralizers, and to increase the utilization of waste products as raw materials, which typically have high aluminum oxide content, affecting the composition of minerals like C3A and impacting the strength of cement.
Innovation Solution
A method involving raw materials with specific compositions: 22-35% C3A and C4AF, 3-18% C2S, 60% or more C3S, an iron modulus of 1.0-1.3, hydraulic modulus of 1.8-2.2, and silica modulus of 1.0-2.0, sintered at 1300-1400°C, and optionally mixed with gypsum and admixtures like blast furnace slag or fly ash, to achieve high strength and efficient waste product utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If waste products with high Al2O3 content are used as raw materials, then the sintering temperature can be reduced, but the content of C3A increases which negatively affects the production of other minerals and the physical properties of cement
Solution Approach 1:
The invention changes the chemical composition parameters of the clinker by precisely controlling the content of C3A (10-20 mass%) and C4AF (15-30 mass%), and by introducing specific modulus parameters (iron modulus 0.8-1.2, hydraulic modulus 1.8-2.2, silica modulus 1.0-2.0) to achieve optimal balance between low-temperature sintering and cement strength
Solution Approach 2:
The invention creates a composite mineral composition in the clinker that combines C3A, C4AF, C3S, and C2S in specific proportions, where C4AF acts as a complementary phase to C3A, enabling the system to achieve both low sintering temperature and high cement strength through synergistic effects of multiple minerals
2Use of energy by stationary object
If the sintering temperature is reduced below conventional levels, then energy costs are saved, but it becomes difficult to produce clinker with excellent physical properties
Solution Approach 1:
The invention changes the thermal processing parameters by sintering at reduced temperature (1300-1400°C instead of conventional 1450-1550°C) while compensating through optimized chemical composition parameters to maintain clinker quality and cement strength
Solution Approach 2:
The invention applies local quality optimization by specifically enhancing the content and distribution of C4AF (15-30 mass%) in conjunction with C3A, creating localized mineral phases that facilitate low-temperature sintering while maintaining overall clinker strength
3Strength
If conventional cement manufacturing is used, then excellent physical properties are achieved, but high energy costs and limited waste product utilization occur
Solution Approach 1:
The invention converts the harmful effect of high Al2O3 content in waste products (which typically raises sintering temperature) into a benefit by utilizing C4AF formation to lower the sintering temperature, thereby enabling waste utilization while reducing energy consumption
Solution Approach 2:
The invention creates a multi-functional clinker composition that simultaneously achieves: (1) waste product utilization, (2) reduced sintering temperature, (3) adequate C3A content for strength, and (4) environmental friendliness, making the manufacturing process serve multiple purposes
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
This method allows for a higher percentage of waste products to be used, reduces sintering temperature to 1300-1400°C, and maintains the strength development properties of conventional cement clinkers, achieving satisfactory mortar compressive strength and setting times.
Implementation Method 1
sintering the raw materials at 1,300 to 1,400°C
Data Source
AI summary
A cement clinker which can be sintered at 1, 300 to 1, 400°C which is lower than the conventional sintering temperature and develops excellent strength characteristics such as mortar compression strength. The cement clinker has a total content of C3A and C4AF calculated by Bogue's formulas of 22 mass% or more, a C3S content calculated by Bogue's formula of 60 mass% or more and an iron modulus (I.M.) of 1.3 or less, preferably 1.0 to 1.3. Since the total content of C3A and C4AF is 22 mass% or more, the cement clinker can be sintered at a low temperature and the reduction of strength when a cement composition is cured can be prevented by reducing the iron modulus of the cement clinker.