Fluidized-Bed Granulation for Attrition-Stable Particles
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Solution Overview
Problem
The existing methods for producing granulated particles in fluidized-bed reactors result in particles with a rough surface, which negatively affects their attrition stability, a critical factor influencing the economics of chemical processes.
Innovation Solution
The method involves feeding inorganic particles with a D90 value between 1 μm and 15 μm into a fluidized-bed granulation reactor, dispersed in a medium, and subsequent calcination to produce spherical granulated particles with improved attrition stability, characterized by a D50 value of 100 μm to 5000 μm, high sphericity, and specific surface area, pore volume, and pore size distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluidized-bed granulation methods are used with larger inorganic particles, then production efficiency is maintained, but the surface roughness increases and attrition stability deteriorates
Solution Approach 1:
The invention changes the particle size parameter of the inorganic particles used in fluidized-bed granulation from conventional larger sizes to specifically 1-15 μm. This parameter change fundamentally alters the granulation process outcomes, producing particles with smooth surfaces and high attrition stability while maintaining production efficiency.
2Reliability
If inorganic particles with D90 value of 1-15 μm are used in fluidized-bed granulation, then attrition stability improves significantly, but the complexity of particle size control increases
Solution Approach 1:
The invention performs preliminary size reduction of inorganic particles to 1-15 μm D90 value before the granulation process. By preparing the particles to the correct size in advance, the actual granulation process becomes simpler and more controllable, while achieving superior attrition stability in the final product.
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 significantly enhances the attrition stability of the granulated particles, achieving an attrition value of less than 5%, with a D50 value of 400 μm to 1000 μm, and specific characteristics such as loose bulk density, specific surface area, and pore distribution, leading to improved performance in chemical processes.
Implementation Method 1
feeding inorganic particles dispersed in a dispersion medium into the fluidized-bed granulation reactor
Implementation Method 2
subsequent calcination to produce spherical granulated particles
Data Source
AI summary
The present invention relates to granulated particles with improved attrition and a method for producing granulated particles by fluidized bed granulation of inorganic particles wherein particles of reduced particle size are fed into a fluldized-bed granulation reactor thereby producing granulated particles with improved attrition.