High-Purity Calcium Hydroxide via Controlled Electrolysis
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Solution Overview
Problem
Existing methods for producing high-purity calcium hydroxide are complex and uneconomical, particularly due to the challenges in purifying calcium hydroxide compositions and the inefficiencies in electrolysis processes.
Innovation Solution
A process involving calcium-based electrolytes and controlled electrolysis conditions is used to produce calcium hydroxide particles with specific impurity levels and particle sizes, followed by separation and hydration to achieve high-purity calcium hydroxide compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional purification steps are used to produce high-purity calcium hydroxide, then product purity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent extracts and removes impurities (Al, Fe, Mn, Si, S, C) from the calcium hydroxide production process through controlled electrolysis conditions and selective precipitation, achieving high purity (lower than 150 ppm Al, lower than 2000 ppm Fe, etc.) without requiring multiple complex purification steps. The impurities are selectively removed during the electrolysis process itself rather than through separate purification operations.
Solution Approach 2:
The patent changes the electrolysis parameters (current density, temperature, electrolyte composition) to control the precipitation of calcium hydroxide and simultaneously control impurity levels. By adjusting these parameters, the process achieves both high purity and efficient production in a single operation, eliminating the need for multiple purification steps.
2Productivity
If electrolysis is used to transform calcium carbonate into calcium hydroxide, then production efficiency is improved, but product purity deteriorates due to impurity accumulation
Solution Approach 1:
The patent converts the harmful effect of impurity accumulation during electrolysis into a beneficial selective precipitation process. By controlling the electrolysis conditions (current density, temperature, electrolyte composition), the process causes impurities to precipitate separately from calcium hydroxide, allowing both efficient production and high purity simultaneously. The impurities that would normally accumulate are instead selectively removed through controlled precipitation.
Solution Approach 2:
The patent introduces an intermediary separation mechanism during electrolysis where impurities are selectively precipitated and separated from the calcium hydroxide product. This intermediary precipitation step acts as a built-in purification mechanism that operates during the production process itself, eliminating the need for post-production purification steps while maintaining high efficiency.
3Manufacturing precision
If multiple purification steps are implemented, then calcium hydroxide purity is improved, but production cost increases
Solution Approach 1:
The patent merges the production and purification operations into a single integrated electrolysis process. Instead of producing calcium hydroxide and then performing separate purification steps, the process simultaneously achieves both production and purification through controlled electrolysis conditions and selective precipitation, thereby reducing costs while maintaining high purity.
Solution Approach 2:
The electrolysis process itself provides the purification function through controlled precipitation of impurities. The process is self-sufficient, using the electrolysis conditions to simultaneously produce calcium hydroxide and remove impurities, eliminating the need for external purification operations and reducing overall production costs.
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 process results in calcium hydroxide particles with low impurity levels and controlled particle sizes, suitable for applications in the food industry, cement compositions, CO2 capture, and flue gas purification, while optimizing production efficiency.
Implementation Method 1
US2022064063 proposes an electrolysis reactor adapted to transform calcium carbonate into calcium hydroxide
Implementation Method 2
heating the calcium carbonate particles of the first group in a reactor of a first circuit up to a temperature range in which carbon dioxide of said calcium carbonate particles is released
Implementation Method 3
contacting the calcium oxide particles with water to form calcium hydroxide particles
Data Source
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AI summary
Calcium hydroxide particulates having a d50 comprised in the range from 10 to 40 microns, preferably in the range from 15 to 25 microns and a specific surface BET lower than 0.75 m2/g, preferably lower than 0.6 m2/g.