Ceramic Cyclone Recovery in Spray-Dried Ceramic Granules
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Solution Overview
Problem
Existing methods for producing granules for ceramic production, particularly those with a particle diameter of 100 µm or less, suffer from high fine powder loss, leading to decreased yield and contamination issues due to metallic impurities, which affect the sinterability and appearance of the final ceramic product.
Innovation Solution
A method involving slurry preparation, granulation using a spray drying device with a ceramic-coated cyclone, recovery of fine powder, and mixing it with the granulated substance to enhance yield and purity, while minimizing metallic impurity contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If spray drying is used to produce granules with particle diameter of 100 μm or less, then the granules are suitable for press molding, but fine powder loss increases and yield decreases
Solution Approach 1:
The patent recovers fine powder that would otherwise be discarded through cyclone separation during the spray drying process. The recovered fine powder is then mixed back with the granulated substance, transforming waste material into a useful component that improves chargeability and maintains yield.
Solution Approach 2:
The patent converts the harmful effect of fine powder loss into a benefit by demonstrating that the recovered fine powder, when mixed with granulated substance, improves chargeability into molds. The fine powder that causes yield loss is transformed into a valuable additive that enhances packing efficiency.
2Productivity
If conventional cyclone is used for fine powder recovery, then fine powder can be collected, but metallic impurity contamination occurs
Solution Approach 1:
The patent introduces a ceramic coating as an intermediary layer between the cyclone's metal surface and the fine powder. This ceramic layer acts as a barrier that prevents direct contact between metallic surfaces and the powder, thereby eliminating metallic impurity contamination while maintaining effective powder recovery.
Solution Approach 2:
The patent applies ceramic coating specifically to the inner surface of the cyclone where contact with fine powder occurs. This localized treatment provides contamination-free recovery without requiring the entire cyclone system to be made of ceramic material, optimizing both purity and practicality.
3Productivity
If fine powder is mixed with granulated substance, then yield and chargeability improve, but iron content increases
Solution Approach 1:
The ceramic-coated cyclone serves as an intermediary that enables fine powder recovery without metallic contamination. This allows the fine powder to be safely mixed with granulated substance to improve yield and chargeability, while the ceramic barrier ensures iron content remains controlled at 20 ppm or less.
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 increases the tamped bulk density of granules, improves chargeability, and ensures stable sinterability and appearance of the ceramic product by reducing metallic impurities to 20 ppm or less, resulting in high-quality ceramics suitable for electronic applications.
Implementation Method 1
an exhaust step of exhausting an atmospheric gas within the spray drying device via a cyclone having a surface made of ceramic
Implementation Method 2
a granulation step of introducing the slurry into a spray drying device to form a granulated substance containing the inorganic compound
Data Source
Figure 1
AI summary
The present invention aims to provide a method for producing granules for ceramic production, the method having high productivity and making it possible to obtain a ceramic which, when produced by press molding the granules and firing the resulting press molded product, has physical properties kept from lowering. The present invention is characterized by including: a slurry preparation step of preparing a slurry including a mixture containing a powder of an inorganic compound, a binder, and a solvent; a granulation step of introducing the slurry into a spray drying device to form a granulated substance containing the inorganic compound; an exhaust step of exhausting an atmospheric gas within the spray drying device via a cyclone having a surface made of ceramic; and a step of mixing a fine powder, which has been recovered by the cyclone during the exhaust step, with the granulated substance obtained in the granulation step.