Active Calcium Silicate Particle Diameter Control
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Solution Overview
Problem
Active calcium silicate particles tend to agglomerate into large flocculated particles during paper production, leading to difficulties in sieving and potential powder-dropping issues due to their high particle size and strong adsorption properties.
Innovation Solution
A method involving the mixing of lime milk, fly ash desilicated liquid, and a particle diameter control agent such as pyrophosphoric acid salts or polyacrylic acid esters, followed by drying and sieving, to control the particle diameter and prevent flocculation, thereby reducing the average particle size and large particle content of active calcium silicate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active calcium silicate particles are used in paper production, then high porosity and strong adsorption properties are achieved, but particles agglomerate into large flocculated particles causing sieving difficulties and powder-dropping issues
Solution Approach 1:
A dispersant is introduced as an intermediary substance between active calcium silicate particles to prevent their direct contact and agglomeration. The dispersant adsorbs onto particle surfaces, creating electrostatic or steric barriers that maintain particle separation during paper production processes, thereby preserving adsorption properties while eliminating flocculation problems.
Solution Approach 2:
The surface charge parameters of active calcium silicate particles are modified through chemical treatment or dispersion agents. By adjusting zeta potential, pH, or surface chemistry, the particles maintain stable dispersion states that prevent flocculation while retaining their high porosity and adsorption capabilities.
2Object-generated harmful factors
If particle diameter of active calcium silicate is reduced to prevent flocculation, then large flocculated particles are eliminated, but manufacturing complexity increases
Solution Approach 1:
Particle size control agents or dispersants are added to the active calcium silicate before the flocculation process occurs during paper production. This preliminary treatment establishes stable particle dispersion and size distribution in advance, preventing subsequent agglomeration without requiring complex post-processing equipment or procedures.
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 method effectively reduces the average particle diameter and large particle content of active calcium silicate, improving its uniformity and quality, making it more suitable for papermaking processes by minimizing sieving difficulties and powder-dropping risks.
Implementation Method 1
the nano-lamellar bodies have edges which show strong nano-properties and adsorption with each other
Implementation Method 2
mixing a lime milk, a fly ash desilicated liquid and a particle diameter control agent and reacting them
Data Source
AI summary
The present invention provides a method for preparing an active calcium silicate. The method comprises: mixing a lime milk, a fly ash desilicated liquid and a particle diameter control agent and reacting them, to obtain a active calcium silicate slurry. The particle diameter control agent is one of a pyrophosphoric acid salt, a metaphosphoric acid salt, a polyphosphoric acid salt, a polyacrylic acid ester, and a polyacrylic acid salt. The preparation method of the present invention can efficiently reduce large particles of the active calcium silicate, so as to reduce the influence of the large particles on papermaking process and paper quality.