Ferrous Phosphate Synthesis from Waste Materials
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Solution Overview
Problem
Current methods for correcting iron chlorosis in plants are either economically inefficient or toxic, and they do not effectively utilize waste materials, while existing fertilizers fail to produce a compound similar to vivianite efficiently from industrial by-products and waste water.
Innovation Solution
A method involving the mixing of waste materials containing phosphoric acid and industrial by-products with Fe(II) to produce a ferrous phosphate compound with a composition similar to vivianite, adjusting pH to precipitate and dry the compound, resulting in a stable and cost-effective fertilizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ferrous sulphate and phosphoric acid are mixed to produce vivianite compound, then the fertilizer effectiveness is improved, but the manufacturing cost increases and waste materials are not utilized
Solution Approach 1:
The invention converts waste materials (ferrous sulphate by-products and phosphoric acid waste streams) into a valuable vivianite fertilizer compound. By treating these waste streams as resources rather than disposal problems, the process achieves both environmental benefit and economic value, producing an effective iron-phosphorus fertilizer at low cost.
Solution Approach 2:
The invention optimizes the chemical parameters of the reaction process, specifically controlling pH levels and Fe:P ratios to maximize vivianite formation from waste materials. By adjusting these parameters, the process efficiently converts low-value waste inputs into high-value fertilizer product with optimal nutritional properties for correcting iron chlorosis.
2Reliability
If conventional iron compounds are applied to correct iron chlorosis, then the treatment effectiveness varies, but the frequency of application must be increased and environmental toxicity increases
Solution Approach 1:
The invention creates a composite fertilizer material containing both iron and phosphorus in the vivianite compound structure. This dual-nutrient composition provides synergistic benefits: iron corrects chlorosis while phosphorus supports overall plant growth. The composite nature of the compound also improves stability and reduces environmental toxicity compared to conventional single-nutrient iron supplements.
3Object-generated harmful factors
If waste materials are utilized to produce ferrous phosphate, then environmental friendliness is improved, but the manufacturing complexity increases
Solution Approach 1:
The invention employs a self-service approach where waste materials contain most of the necessary components for vivianite formation. The waste ferrous sulphate and phosphoric acid streams naturally provide the Fe and P precursors, requiring minimal additional processing or additives. This self-service characteristic simplifies the manufacturing process while maintaining environmental benefits.
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 produces a stable ferrous phosphate compound with improved resistance to drying and higher yield, effectively correcting iron chlorosis in plants while being economically viable and environmentally friendly.
Implementation Method 1
adjusting the pH of the resulting solution or suspension to a value between 6.5 and 7.5 with a mixture comprising at least one of NH4OH, NaOK and KOH, thereby precipitating the product comprising ferrous phosphate
Data Source
Figure 1~2
Figure 3~4
AI summary
Methods are described for obtaining a compound with a composition similar to vivianite from waste materials or by-products containing phosphoric acid and/or phosphates as sources of P and ferrous waste compounds as a source of Fe(II), so obtaining an iron and phosphorous compound with a composition similar to the vivianite which is useful as a solid fertilizer, which is a nutritional source of phosphorous and iron and is also useful in the preventive or corrective treatment of iron chlorosis in plants.