Fertilizer Mixture with Iron Compounds for Dust Control
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Solution Overview
Problem
The challenge is to create a cost-effective, quick, and low-dust fertilizer mixture that contains calcium carbonate and/or magnesium carbonate and sulfur, capable of pH regulation in soils while providing sulfur in a form available to plants, as existing methods face issues with dust generation and sulfur deficiency.
Innovation Solution
A free-flowing fertilizer mixture comprising calcium and/or magnesium carbonate, sulfur compounds, and iron hydroxide or oxyhydroxide, with a neutralization value of at least 20, an aluminum content of less than 3.6%, and an iron content of 0.2 to 9% by weight, where sulfur is at least partially in sulfate form, produced by mixing granular solid components, water-soluble iron salts, and optional further components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If finely ground limestone or dolomite is used to rapidly increase soil pH, then the neutralization effect is improved, but dust generation increases significantly
Solution Approach 1:
The invention combines finely ground limestone or dolomite with iron compounds (such as iron sulfate, iron oxide, or iron hydroxide) to create a composite fertilizer mixture. The iron compounds act as dust-reducing agents that bind to the fine carbonate particles, reducing dust generation while maintaining the rapid neutralization effect of the finely ground material.
Solution Approach 2:
Iron compounds serve as an intermediary substance that mediates between the finely ground limestone/dolomite and the environment. The iron compounds coat or bind to the fine particles, preventing them from becoming airborne dust while allowing the neutralization function to proceed.
2Object-generated harmful factors
If measures such as granulation or moistening are applied to reduce dust, then dust generation is reduced, but process complexity and costs increase
Solution Approach 1:
The invention merges the dust-reduction function with the fertilization function by combining limestone/dolomite with iron compounds that serve dual purposes: reducing dust and providing nutritional value to plants. This eliminates the need for separate granulation or moistening processes.
Solution Approach 2:
The iron compounds in the mixture self-regulate dust generation without requiring external processing steps. The chemical interaction between the iron compounds and carbonate particles naturally reduces dust emission, eliminating the need for additional equipment or process steps.
3Quantity of substance
If sulfur is added to fertilizers to address sulfur deficiency, then plant nutrition is improved, but soil acidification worsens
Solution Approach 1:
The fertilizer mixture serves multiple functions simultaneously: the limestone/dolomite component neutralizes soil acidity and increases pH, while the iron compounds provide sulfur nutrition to plants. This multi-functional approach addresses both sulfur deficiency and prevents additional acidification.
Solution Approach 2:
The invention changes the chemical form and composition parameters of the fertilizer by using iron compounds instead of traditional sulfur fertilizers like ammonium sulfate. This parameter change allows sulfur delivery without the associated acidification problem.
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 solution results in a homogeneous, low-dust fertilizer mixture that effectively regulates soil pH and provides available sulfur, reducing dust formation and improving crop yields while minimizing environmental contamination.
Implementation Method 1
a granular solid component containing CaCO3 and/or CaMg(CO3)2 which has an aluminum content of < 3.6% by weight, based on its dry mass, and an iron content of 0.2 to 9% by weight
Implementation Method 2
The addition of lime or dolomite can neutralize acids in the soil and leads to an improvement in nutrient availability and soil structure
Data Source
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AI summary
The invention relates to a method for production of a fertilizer mixture which is as dust-free as possible and simultaneously reactive, contains at least calcium carbonate and/or (calcium) magnesium carbonate and sulfur, and is in particular free-flowing. The fertilizer mixture should enable a pH adjustment of the ground to be fertilizer and to provide the sulfur in a form available for plants. The fertilizer mixture contains calcium carbonate and/or magnesium carbonate, sulfur and iron compounds, preferably iron hydroxide compounds and/or iron oxide compounds, and furthermore is characterized in that the neutralization value (as CaO) of the fertilizer mixture is at least 20, and the fertilizer mixture has, based on the dry mass thereof determined by drying at 50 °C to weight constancy, at least for 24 h, a) an aluminium content of < 3.6 wt%, (calculated as Al2O3) and b) has a Fe content of 0.2 to 9 wt%, and c) wherein the sulfur is present at least partially in sulfate form.