Granulator Temperature Control for Hydrous Nitrate Salt Granules
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Solution Overview
Problem
The existing methods for granulating hydrous nitrate mineral salt-based compositions struggle to produce granules with a round shape and minimal dust production, due to challenges in controlling the water content within the granulator.
Innovation Solution
A method is developed that involves granulating a melt of hydrous nitrate mineral salt-based composition using a granulator operating on the agglomeration principle, where the temperature in the granulator is controlled between 90 to 96°C by adjusting the recycled amounts of granules, thereby maintaining optimal liquid phase content and preventing both wet and dry granulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the amount of water in the granulator is not controlled, then the granulation process can proceed, but the granules will not have a round shape and dust production increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the temperature parameter in the granulator to maintain the liquid phase content within a specific range (90-96°C). This temperature control directly influences the water content in the granulation process, enabling the formation of round granules while minimizing dust production without requiring direct measurement or addition of water.
2Manufacturing precision
If the water content in the granulator is not precisely measured, then the granulation can continue, but both wet and dry granulation occur resulting in poor granule quality
Solution Approach 1:
The patent replaces direct mechanical measurement of water content with temperature measurement. By measuring temperature in the granulator and using it to calculate liquid phase content through established relationships, the system avoids the complexity and inaccuracies of direct water content measurement while achieving precise control over granulation quality.
Solution Approach 2:
Temperature serves as an intermediary parameter that indirectly controls water content. Instead of directly measuring or adding water, the system uses temperature as a mediator to regulate the liquid phase content, thereby controlling granulation outcomes without requiring direct water management.
3Manufacturing precision
If more liquid is added to the granulator to prevent dry granulation, then granule formation improves, but wet granulation occurs with oversized granules
Solution Approach 1:
The patent uses temperature parameter changes to precisely regulate liquid phase content. By maintaining temperature within 90-96°C, the system ensures optimal liquid content for granule formation without excess that would cause wet granulation and oversized particles, thereby achieving uniform granule size distribution.
4Shape
If less liquid is added to the granulator to prevent wet granulation, then oversized granule formation is prevented, but dry granulation occurs with porous and uneven granules
Solution Approach 1:
The patent applies temperature control to maintain optimal liquid phase content. By keeping temperature within the 90-96°C range, the system ensures sufficient liquid for forming dense, strong granules while preventing wet granulation and oversized particle formation, achieving both uniform size and high density.
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 method effectively produces granules with a round shape and significantly reduces dust production, as the controlled temperature ensures optimal liquid phase content within the granulator, resulting in high-quality granules.
Implementation Method 1
measuring a temperature in the granulator, said temperature ranges from 90 to 96°C
Implementation Method 2
controlling the percentage of liquid phase inside the granulator
Implementation Method 3
granulation according to the agglomeration principle is defined as the process during which a powder is in contact with a liquid binder, thereby causing the wet powder particles to become cohesive and agglomeration to occur during particle collisions
Data Source
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AI summary
The present disclosure relates to a method for controlling the temperature in a granulator in which a melt of an hydrous nitrate mineral salt-based composition is granulated. The method comprises the steps of granulating the melt, separat- ing out the undersized and oversized particles at the outlet of the granulator and recycling the undersized and oversized particles to the granulator, measuring the temperature in the granulator, adjusting the amounts of undersized and over- sized particles recycled to the granulator according to the measured temperature in the granulator. The present disclosure further relates to low dust producing uncoated granules of a hydrous nitrate mineral salt-based composition.