Method for the Preparation of Phosphoric Acid from Phosphorus-Containing Primary and Secondary Raw Materials

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This invention describes a method for producing high-purity phosphoric acid from both phosphorus-rich primary raw materials (such as phosphate ores) and secondary raw materials (such as sewage sludge ash, animal bone ash, and industrial waste) using a process that combines chemical acid leaching and electrodialysis. The method enables efficient extraction and separation of phosphoric acid by utilizing monovalent mineral acids (like hydrochloric or nitric acid), followed by purification using selective membranes and liquid-liquid extraction. The process allows for efficient recovery of valuable phosphoric acid, minimizes waste and the use of chemicals, and recycles process reagents, making it suitable for processing various and previously underutilized phosphorus sources.

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• Production of high-purity phosphoric acid for use in fertilizers, food industry, or electronics.
• Recycling phosphorus from secondary waste streams such as sewage sludge ash, animal bone ash, or industrial by-products.
• Treatment and valorization of waste containing phosphorus, reducing landfill and environmental impact.
• Manufacturing processes requiring cost-effective, high-quality phosphoric acid as an intermediate or end-product.
• Integration into existing chemical plants to enhance resource efficiency and reduce raw material dependency.

BenefitsContent extracted from patent full text and abstract with AI.

• Enables recovery of high-purity phosphoric acid from both primary (ores) and secondary (waste) phosphorus sources.
• Reduces waste disposal challenges and associated environmental impact by recycling phosphorus from waste streams.
• Significantly reduces chemical usage, processing costs, and energy consumption compared to traditional methods.
• Minimizes the production of low-value or non-marketable by-products (such as gypsum), increasing overall process profitability.
• Highly adaptable to a wide range of input materials, including otherwise unprocessable secondary resources.
• Efficient regeneration and recycling of process acids, increasing economic and ecological sustainability.
• Compatible with renewable energy sources and can help stabilize power grids due to controllable electrodialysis steps.

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Patent Abstract

Die Erfindung betrifft ein Verfahren zur Herstellung von Phosphorsäure aus phosphorhaltigen Primär- und/oder Sekundärrohstoffen mittels Aufschluss der phosphorhaltigen Primär- und/oder Sekundärrohstoffe durch eine einwertige mineralische Aufschlusssäure und Separation von festen Rückständen zum Erhalt einer Aufschlusslösung, enthaltend Rohphosphorsäure und Calcium- und /oder Magnesiumsalze der Aufschlusssäure, gekennzeichnet dadurch, dass die Aufschlusslösung in einen Diluat-Prozesskreislauf einer Elektrodialysevorrichtung mit Anionen- und Kationenaustauschermembranen eingebracht wird, dass durch Anlegen eines elektrischen Feldes Calcium- und /oder Magnesiumionen und Aufschlusssäureanionen aus der Aufschlusslösung in einen Konzentrat-Prozesskreislauf der Elektrodialysevorrichtung migrieren und dabei von der Rohphosphorsäure im Diluat abgetrennt werden, dass nach der Abtrennung die Elektrodialyse gestoppt und dass das Diluat weiter konzentriert und aufgearbeitet wird