Polyhalite Composite Fertiliser Pellet Sustained Release
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Solution Overview
Problem
Existing fertiliser compositions, particularly those using polyhalite, face challenges in bioavailability, uniform application, and environmental dependency, leading to unpredictable effectiveness and difficulties in spreading due to irregular shapes and hygroscopic properties.
Innovation Solution
A fertiliser pellet comprising a core of polyhalite with a higher solubility micronutrient fertiliser composition and a lower solubility micronutrient fertiliser composition, either mixed homogeneously or layered, to provide a sustained release of nutrients, enhancing bioavailability and application uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polyhalite is applied in raw crushed form to minimise processing costs, then manufacturing cost is reduced, but the mineral takes time to break down delaying bioavailability of nutrients
Solution Approach 1:
The polyhalite mineral is pre-crushed and granulated into smaller, more uniform particles before application. This segmentation increases the surface area and reduces the time required for natural breakdown in the soil, thereby accelerating nutrient bioavailability while still maintaining cost-effectiveness compared to finer grinding methods
Solution Approach 2:
The polyhalite undergoes preliminary mechanical processing (crushing and granulation) before field application. This pre-treatment prepares the mineral to break down more quickly in the soil environment, ensuring faster nutrient release and plant availability without requiring extensive chemical or thermal processing
2Ease of manufacture
If polyhalite is applied in chipped form, then processing cost is reduced, but the irregular shape and size cause difficulties in uniform application
Solution Approach 1:
The polyhalite is crushed and granulated to produce particles with consistent size ranges and more uniform shapes compared to chipped form. This controlled segmentation enables better flow characteristics and more even distribution during spreading operations, achieving uniform application while avoiding the high costs of精细 grinding
Solution Approach 2:
The physical parameters of the polyhalite (particle size distribution, shape factor) are optimized through controlled crushing and granulation processes. This creates particles that maintain low processing costs while achieving the uniformity required for reliable mechanical spreading and consistent field application
3Ease of operation
If polyhalite is powdered to improve spreadability, then application ease is improved, but the hygroscopic nature causes mechanical properties to vary radically over time
Solution Approach 1:
The polyhalite is granulated into small but not fine particles, creating a size that maintains good flow and spreadability characteristics. This granulated form reduces the hygroscopic surface area exposure compared to powder, thereby stabilizing mechanical properties over time while preserving adequate spreadability for agricultural application
Solution Approach 2:
The particle size parameter is optimized to a specific range that balances spreadability with stability. The granulated form has sufficient surface area for good flow characteristics but limited enough exposure to moisture to prevent rapid changes in mechanical properties, achieving a stable compromise between these competing requirements
4Quantity of substance
If multiple distinct fertiliser compositions are applied to provide multiple nutrients, then nutrient completeness is improved, but the number of spreading operations increases
Solution Approach 1:
Multiple nutrient sources (polyhalite providing K, Ca, Mg, S and separate micronutrient sources) are combined into a single composite granulated fertiliser product. This merging allows all necessary nutrients to be applied simultaneously in one spreading operation, improving efficiency while maintaining complete nutritional coverage for crop requirements
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 pellet design ensures a controlled and sustained release of nutrients, improving plant growth and development with a single spreading operation, while minimizing processing costs and application difficulties.
Implementation Method 1
the third fertiliser composition having a lower solubility than the second fertiliser composition
Data Source
AI summary
A fertiliser pellet comprising: a first fertiliser composition capable of providing (a) two or more alkali metal and/or alkaline earth metal nutrients and (b) sulphur; a second fertiliser composition capable of providing a first micronutrient; and a third fertiliser composition capable of providing a second micronutrient, the third fertiliser composition having a lower solubility than the second fertiliser composition.