Microbubble Silicon Defluorination in Phosphate Rock Acid Decomposition
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Solution Overview
Problem
Existing methods for fluorine recovery from phosphate rock in the wet process for phosphoric acid production are inefficient in removing and recovering fluorine impurities, leading to high fluorine content in phosphogypsum and waste of fluorine resources.
Innovation Solution
A method involving the use of a microbubble coupled silicon additive during the acid-decomposition process of phosphate rock, enhancing the conversion of fluorine into volatile fluoride for separation and recovery, utilizing the synergistic effect of microbubbles and active silicon additives to accelerate reactions and facilitate gas stripping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing defluorination processes are applied to wet-process phosphoric acid, then fluorine removal is performed, but fluorine impurities cannot be removed from the source and phosphogypsum still contains high fluorine content
Solution Approach 1:
The patent applies preliminary action by adding silicon additive and microbubbles during the acid decomposition process of phosphate rock, before the main phosphoric acid production process. This converts fluorine to volatile fluoride form in advance, enabling source removal and preventing fluorine from entering subsequent processes, thereby solving both the harmful fluorine content in phosphogypsum and achieving high fluorine recovery
Solution Approach 2:
The patent uses silicon additive as an intermediary substance that reacts with fluorine during acid decomposition to form volatile fluoride compounds. The microbubbles serve as another intermediary that facilitates the release and separation of these volatile fluorides from the reaction system, enabling effective fluorine removal at the source
2Productivity
If microbubbles are used to strengthen release of fluorine-containing gases, then existing fluorine release is enhanced, but transformation of other fluorine-containing substances is difficult
Solution Approach 1:
The patent applies parameter changes by introducing silicon additive that chemically transforms fluorine-containing substances into volatile fluoride forms with different physical and chemical properties. This parameter change (from non-volatile to volatile form) enables complete conversion and efficient release of all fluorine species, not just pre-existing volatile fluorides
Solution Approach 2:
The patent uses a composite approach by combining silicon additive with microbubble technology. The silicon additive provides chemical transformation capability while microbubbles provide physical separation and release enhancement, creating a synergistic system that achieves both complete fluorine conversion and high release efficiency
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
Achieves a high fluorine recovery rate of 43.9% or more, effectively separating fluorine from the source and preventing its entry into subsequent phosphoric acid processes, reducing fluorine content in phosphogypsum.
Implementation Method 1
enhancing the conversion of fluorine into volatile fluoride for separation and recovery, utilizing the synergistic effect of microbubbles and active silicon additives to accelerate reactions
Implementation Method 2
utilizing the synergistic effect of microbubbles and active silicon additives to accelerate reactions and facilitate gas stripping
Data Source
AI summary
The present application provides a method for fluorine separation and recovery from phosphate rock enhanced with a microbubble coupled silicon additive, which includes: mixing the phosphate rock, phosphoric acid, and an active silicon additive, and subjecting the mixture to reaction to obtain a slurry; subjecting the slurry to microbubble generation treatment to obtain a microbubble slurry, and subjecting the microbubble slurry to recycling and returning to the reaction, where a released volatile fluoride is recovered; and after completing the reaction, a defluorinated slurry is obtained; and subjecting the obtained defluorinated slurry to acid-decomposition reaction and then solid-liquid separation to obtain phosphoric acid and phosphogypsum. In the method provided by the present application, a synergistic effect of microbubbles and the active silicon additive is used in the phosphoric acid acid-decomposition of phosphate rock, enhancing the fluorine impurities in phosphate rock to convert into volatile fluoride SiF4 and HF, achieving the highly efficient separation and recovery of fluorine, and a recovery rate of fluorine reaches 43.9% or more; moreover, the fluorine impurities are separated from the source in the acid decomposition of phosphate rock, thereby preventing fluorine from entering the subsequent wet phosphoric acid process.