Calcium Carbonate Surface Modification with Lithium Ions
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Solution Overview
Problem
Current methods for producing calcium carbonate-containing materials in suspensions or dry forms fail to achieve high dry matter concentration with low Brookfield viscosity that remains stable over time, while maintaining good pH buffer capacity and minimizing dispersant or grinding aid usage, which is essential for paper production.
Innovation Solution
The process involves modifying the surface of calcium carbonate particles with lithium ion-containing compounds, such as lithium oxide or organic salts, to enhance adsorption properties, allowing for the creation of suspensions with high dry solids content and stable pH, even at reduced dispersant levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water soluble polymers based on polyacrylic acid are used as grinding aid agents, then aqueous mineral suspensions can be obtained, but the refinement and viscosity criteria are not met and pH stability over time is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the grinding aid by using partially neutralized polyacrylic acid with specific neutralization degrees (50-100%) and controlled molecular weights (10,000-1,000,000), thereby achieving both refined particle size and stable pH characteristics that previous formulations could not provide
2Productivity
If high dry matter concentration is achieved in calcium carbonate suspensions, then productivity increases, but Brookfield viscosity becomes too high and unstable
Solution Approach 1:
The patent optimizes the molecular weight parameters of the polyacrylic acid dispersant (specifically 100,000-500,000) and its neutralization degree (70-100%), which enables the suspension to maintain low and stable Brookfield viscosity even at high dry matter concentrations of 60-80%, thereby improving productivity without sacrificing stability
3Ease of manufacture
If dispersant quantity is reduced to lower costs, then manufacturing cost decreases, but the ability to maintain low viscosity and high stability is compromised
Solution Approach 1:
The patent changes the quality parameters of the dispersant to use partially neutralized polyacrylic acid with optimal molecular weight (100,000-500,000) and neutralization degree (70-100%), which significantly improves dispersant efficiency. This allows reduction of dispersant dosage while maintaining suspension stability and low viscosity, thereby reducing manufacturing 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
This approach results in calcium carbonate materials with improved dispersant adsorption properties, achieving stable Brookfield viscosity and pH over time, even at high dry solids concentrations, without undesirable side reactions, and maintains excellent optical properties for paper applications.
Implementation Method 1
certain lithium ion-containing compounds act as adsorption properties modifier of the surface of the calcium carbonate particles
Data Source
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AI summary
The invention relates to a process for manufacturing calcium carbonate materials having a particle surface with improved adsorption properties of dispersant, using at least one lithium ion-containing compound, the calcium carbonate material obtained by this process, the use of the calcium carbonate materials in paper, paints and plastics, as well as the use of the lithium ion-containing compounds in the manufacturing process.