Phosphate Fertilizer Granulation Reactor Grinding
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Solution Overview
Problem
Existing methods for producing fertilizer granules from phosphate-containing raw materials are either cost-intensive or result in inert raw material particles that clog devices, such as nozzles, during the granulation process.
Innovation Solution
A method involving a grinding process in the reactor unit to comminute phosphate-containing raw materials, increasing their surface area and reactivity, followed by spray granulation or drying, which enhances process stability, reduces clogging risks, and improves the even conversion of raw materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If phosphate-containing raw materials are mixed with acid to form suspension for granulation, then fertilizer granules can be produced, but the raw material particles are inert and tend to clog at narrow points in devices such as nozzles
Solution Approach 1:
The patent applies preliminary action by performing a grinding process on phosphate-containing raw materials before mixing them with acid to form suspension. This pre-grinding reduces particle size and eliminates inert characteristics, preventing clogging at narrow points in subsequent granulation equipment while maintaining production efficiency
2Device complexity
If large raw material particles are used in suspension, then the process is simpler, but the reaction participation is low and conversion is uneven
Solution Approach 1:
The patent changes the particle size parameter of phosphate-containing raw materials through a grinding process before suspension formation. This parameter change increases the surface area to volume ratio, improving reaction participation and ensuring even conversion during the acid treatment and granulation processes
3Use of energy by moving object
If no grinding process is applied, then energy consumption is lower, but the raw material particles remain coarse and cause blockages
Solution Approach 1:
The patent replaces coarse mechanical mixing with a controlled grinding process that uses mechanical energy efficiently to reduce particle size. This substitution ensures particles are fine enough to flow through nozzles without blockages while optimizing energy consumption through targeted size reduction rather than excessive grinding
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 reactivity of raw material particles, accelerates reaction kinetics, and reduces the risk of blockages, leading to more efficient and cost-effective production of fertilizer granules with improved quality and availability of phosphate content.
Implementation Method 1
the grinding process comminutes the phosphate-containing raw materials that have large raw material particles
Implementation Method 2
the suspension is then fed to a spray device for granulation and/or drying
Implementation Method 3
Spray granulation is preferably carried out, in particular by means of a fluidization apparatus, such as a fluidized or spouted bed apparatus
Data Source
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AI summary
The invention relates to a process for producing fertilizer granules, wherein a suspension of a phosphate-containing raw material and an acid is first produced in a reactor unit (4) having a reactor (3), and wherein a grinding process takes place in the reactor unit (4) and the suspension is then fed to a spray device (10) for granulation and/or drying.