Microbubble-Assisted Purification of Phosphoric Acid and Phosphogypsum
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Solution Overview
Problem
Existing methods for purifying phosphogypsum and phosphoric acid from wet-process phosphoric acid slurry are inefficient, costly, and require extensive post-treatment, failing to effectively remove colloidal silicon and carbon impurities during the reaction process, which complicates the production process and increases environmental pollution.
Innovation Solution
A method involving the addition of an impurity-removal agent to wet-process phosphoric acid slurry under a microbubble external field, followed by crystallization and solid-liquid separation, utilizing microbubbles to enhance impurity adhesion and separation, thereby achieving in-situ removal of colloidal silicon and carbon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If flotation impurity-removal method is used to purify phosphogypsum, then impurity removal effect is improved, but process complexity and treatment cost increase
Solution Approach 1:
The patent applies preliminary action by adding the impurity removal agent during the phosphogypsum generation reaction process rather than as a post-treatment step. The agent is introduced into the reaction system before phosphogypsum crystallization completes, allowing impurities to be removed in-situ during the formation process itself, thereby simplifying the overall process flow and reducing treatment costs while maintaining effective impurity removal.
2Manufacturing precision
If multiple extraction and concentration processes are applied to phosphoric acid, then phosphoric acid purity is improved, but production cost and process complexity increase
Solution Approach 1:
The patent removes impurities from the phosphoric acid phase in-situ during the reaction process by adding the impurity removal agent before phosphogypsum crystallization. This preliminary removal action prevents impurities from being incorporated into the phosphoric acid solution, eliminating or reducing the need for subsequent extraction and concentration processes, thereby simplifying the production process while ensuring high phosphoric acid purity.
3Manufacturing precision
If phosphogypsum is treated as post-product requiring separate purification, then impurity removal is achieved, but production efficiency decreases
Solution Approach 1:
The patent merges the impurity removal function with the phosphogypsum generation reaction process by adding the impurity removal agent directly to the reaction system. This combines two previously separate operations (phosphogypsum production and impurity removal) into a single integrated process, allowing both functions to occur simultaneously without requiring separate purification steps, thereby maintaining high production efficiency while achieving effective impurity removal.
4Manufacturing precision
If conventional flotation method with slurry preparation is used, then impurity separation is improved, but production time and resource consumption increase
Solution Approach 1:
The patent applies preliminary action by introducing the impurity removal agent during the reaction process rather than requiring separate slurry preparation steps. The agent is added to the reaction mixture before phosphogypsum crystallization completes, allowing impurities to be removed in-situ without the need for subsequent slurry preparation, filtration, and drying operations required by conventional flotation methods, thereby significantly reducing production time and resource consumption.
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
This method enables rapid and cost-effective separation of impurities during the phosphogypsum production process, reducing the need for post-treatment and resulting in low-impurity phosphoric acid and phosphogypsum products.
Implementation Method 1
the microbubbles are used to strengthen the adhesion of impurities, and the floating upward and breaking process of microbubbles can provide energy to break large phosphogypsum particles in the slurry
Implementation Method 2
adding an impurity-removal agent to the wet-process phosphoric acid slurry, mixing under the action of a microbubble external field to obtain a colloidal impurity-containing organic phase and an impurity-removed mineral slurry
Implementation Method 3
the impurity-removal agent and microbubble external field are coordinated, the microbubbles are used to strengthen the adhesion of impurities
Implementation Method 4
subjecting the impurity-removed mineral slurry to crystallization and solid-liquid separation in sequence to obtain the impurity-removed phosphoric acid and phosphogypsum
Data Source
AI summary
The present application provides a method for separating and purifying phosphoric acid and phosphogypsum from a wet-process phosphoric acid slurry, and phosphoric acid and phosphogypsum prepared thereby. The method is beneficial for the dissociation, precipitation and separation of colloidal silicon and carbon impurities, such that the aim of in-situ removal and rapid separation of colloidal impurities to obtain the ore slurry, from which impurities have been removed, during a reaction process for outputting phosphogypsum is realized, and a low-impurity phosphoric acid product and phosphogypsum product can be obtained after the ore slurry, from which impurities have been removed, has been further treated.