Two-Acid Cement Process Reducing CO2 Emissions
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Solution Overview
Problem
Conventional cement production is energy-intensive and generates environment-degrading byproducts such as CO2 and SO2, and relies on a limited range of feedstocks, primarily simple calcium-based materials.
Innovation Solution
A two-acid approach is used to produce cement materials, where a calcium-bearing starting material is reacted with one acid to form an aqueous calcium salt, which is then reacted with a different acid to form a solid calcium salt, allowing for thermally treating the calcium salts to produce cement while regenerating reagents and reducing or eliminating CO2 and SO2 emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional cement production processes are used, then cement materials can be produced, but the process is energy-intensive and generates harmful byproducts such as CO2 and SO2
Solution Approach 1:
The patent converts harmful CO2 and SO2 emissions into useful products. CO2 is converted into carbonates or bicarbonates that can be used as cement additives, while SO2 is converted into sulfates that serve as cementitious materials. This transforms environmental pollutants into valuable resources, simultaneously reducing emissions and maintaining energy efficiency
Solution Approach 2:
The invention changes the chemical parameters of the emission streams by adjusting pH levels, temperature, and pressure conditions to facilitate the conversion of CO2 into carbonates and SO2 into sulfates. By controlling these parameters, the process efficiently transforms harmful gases into beneficial cement components without excessive energy input
2Object-generated harmful factors
If conventional cement production processes are used, then cement materials can be produced, but the process produces environment-degrading byproducts
Solution Approach 1:
The patent systematically converts harmful byproducts into beneficial cement constituents through chemical transformation processes. CO2 is captured and converted into carbonate minerals, while SO2 is transformed into sulfate compounds that enhance cement performance. This approach eliminates environmental degradation while maintaining manufacturing feasibility
Solution Approach 2:
The invention introduces intermediary chemical reactions and processing steps that mediate between the harmful emissions and the final cement product. These intermediary processes convert pollutants into intermediate compounds (carbonates, sulfates) that are then integrated into the cement formulation, bridging the gap between environmental protection and manufacturing simplicity
3Adaptability or versatility
If conventional cement production processes are used, then cement materials can be produced, but only a limited range of feedstocks can be utilized
Solution Approach 1:
The patent creates a universal processing system that can handle diverse feedstocks including industrial wastes, agricultural residues, and conventional minerals. The chemical conversion processes are designed to accommodate various carbon-containing and sulfur-containing materials, transforming them all into useful cement components through standardized treatment pathways
Solution Approach 2:
The invention employs adjustable processing parameters (temperature, pressure, pH, reaction time) that can be optimized for different feedstock types. This flexibility allows the same basic process framework to accommodate a wide variety of raw materials while managing the complexity through systematic parameter control rather than requiring entirely different processes for each material type
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 results in a less energy-intensive process that can utilize a wider range of feedstocks, generates value-added side products, and produces cement materials that are net energy neutral or even net energy producing, with reduced environmental impact by minimizing CO2 and SO2 emissions.
Implementation Method 1
first reacting a calcium-bearing starting material with a first acid to produce an aqueous first calcium salt
Implementation Method 2
second reacting the aqueous first calcium salt with a second acid to produce a solid second calcium salt
Implementation Method 3
produce a solid second calcium salt
Implementation Method 4
thermally treating one or more calcium salts to produce a first cement material
Implementation Method 5
thermally treating one or more calcium salts to produce a first cement material
Implementation Method 6
reaction between the first calcium salt and the second acid regenerates the first acid
Data Source
AI summary
Aspects of the invention include a method of producing a cement material comprising step of: first reacting a calcium-bearing starting material with a first acid to produce an aqueous first calcium salt; second reacting the aqueous first calcium salt with a second acid to produce a solid second calcium salt; wherein the second acid is different from the first acid and the second calcium salt is different from the first calcium salt; and thermally treating the second calcium salt to produce a first cement material. Preferably, but not necessarily, during the second reacting step, reaction between the first calcium salt and the second acid regenerates the first acid.