Solid-State Calcium Hydroxide Carbonation for Brightness and Energy
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Solution Overview
Problem
Conventional methods for producing calcium carbonate via precipitation require significant energy and resources due to the need for drying an aqueous solution, and often result in inadequate brightness characteristics of the extracted product.
Innovation Solution
Producing calcium carbonate through direct contact of solid-state calcium hydroxide particles with carbon dioxide, utilizing particles with specific surface area, moisture content, and porosity characteristics to enhance conversion efficiency and brightness, and iteratively milling and drying the particles to achieve desired composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional precipitation method is used to produce calcium carbonate, then calcium carbonate can be produced, but significant energy is needed to dry the aqueous solution
Solution Approach 1:
The patent changes the physical state parameter of the reaction system from aqueous solution to solid-state particles. By using solid calcium hydroxide particles instead of aqueous lime slurry, the reaction produces solid calcium carbonate directly without generating aqueous waste that requires energy-intensive drying. This parameter change eliminates the drying step and associated energy consumption.
Solution Approach 2:
The patent extracts and removes the aqueous solution component from the production process entirely. By using solid-state reactants and producing solid-state product, the process eliminates the need to handle, separate, and dry aqueous solutions, thereby removing the energy-intensive drying operation from the manufacturing workflow.
2Illumination intensity
If conventional precipitation method is used, then calcium carbonate is produced, but the brightness characteristics of the extracted product are inadequate
Solution Approach 1:
The patent changes the physical state parameter from aqueous to solid-state, which inherently improves product brightness. Solid-state reaction produces dry, free-flowing particles with superior optical properties compared to extracted precipitated calcium carbonate. The solid-state process eliminates the need for extraction and drying, preserving the brightness characteristics of the product.
3Productivity
If solid-state calcium hydroxide particles are used with specific surface area and porosity characteristics, then conversion efficiency is enhanced, but particle characterization and control become more complex
Solution Approach 1:
The patent optimizes particle parameters (surface area, porosity, moisture content) to enhance conversion efficiency. By controlling these physical parameters of the solid calcium hydroxide particles, the reaction rate and completeness are improved. The specific surface area and porosity characteristics facilitate better CO2 penetration and reaction kinetics, while moisture content control prevents clumping and maintains particle reactivity.
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 reduces energy consumption, enhances calcium carbonate brightness, and allows production from a wider range of raw materials, thereby lowering costs and increasing geographic availability of high-brightness calcium carbonate products.
Implementation Method 1
a first plurality of particles comprising solid-state calcium hydroxide is provided, and a gas stream comprising carbon dioxide is introduced to directly contact the calcium hydroxide and produce solid-state particles comprising calcium carbonate
Data Source
AI summary
Methods and systems for producing calcium carbonate from calcium hydroxide and carbon dioxide are disclosed herein. In some embodiments, a method for producing calcium carbonate comprises (i) providing a first plurality of particles comprising solid-state calcium hydroxide, and (ii) introducing a gas stream comprising carbon dioxide to the first plurality of particles to produce a second plurality of particles comprising calcium carbonate. Individual ones of the first plurality of particles can include a specific surface area of at least 20 m2/g and a free moisture content of from 2% to 20%. The second plurality of particles comprising calcium carbonate are not produced via precipitation.