Selective Fluoride Removal from Iodide Aqueous Solutions
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Solution Overview
Problem
Existing methods, such as electrodialysis, are inadequate in sufficiently reducing fluoride ion concentrations in untreated water containing iodide ions, necessitating an alternative approach.
Innovation Solution
An inorganic flocculant with iodide ion non-selectivity is used to form aggregates with fluoride and phosphate ions, allowing for their separation from iodide ions, followed by a solid-liquid separation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If electrodialysis method is used to selectively recover iodide ions, then iodide ion recovery is improved, but fluoride ion removal is insufficient
Solution Approach 1:
The patent introduces an inorganic flocculant as an intermediary substance that selectively binds to fluoride ions and phosphate ions to form aggregates. This mediator enables the separation of fluoride/phosphate from iodide through aggregate formation and subsequent solid-liquid separation, resolving the contradiction where electrodialysis could recover iodide but failed to sufficiently remove fluoride ions.
2Manufacturing precision
If inorganic flocculant is used to form aggregates with fluoride ions, then fluoride ion removal is improved, but iodide ion recovery must be maintained
Solution Approach 1:
The inorganic flocculant exhibits selective reactivity with specific ions (fluoride and phosphate) while remaining non-selective toward iodide ions. This local quality difference in chemical reactivity allows the flocculant to form aggregates preferentially with fluoride/phosphate ions, enabling their removal while leaving iodide ions in solution for subsequent recovery, thus resolving the contradiction between fluoride removal efficiency and iodide recovery.
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 effectively reduces fluoride and phosphate ion concentrations while maintaining high iodide ion recovery rates, producing treated water suitable for effluent standards.
Implementation Method 1
a flocculation step of bringing an inorganic flocculant that selectively reacts with fluoride ions and/or phosphate ions more than with iodide ions into contact with untreated water containing iodide ions and fluoride ions and/or phosphate ions, to obtain an aggregate formed by a reaction between the fluoride ions and/or the phosphate ions and the inorganic flocculant
Implementation Method 2
a separation step of removing the aggregate from the untreated water to leave the iodide ions in the untreated water, to obtain treated water
Data Source
Figure 1~2
AI summary
A method for producing an iodine component-containing aqueous solution according to the present invention includes a flocculation step of bringing an inorganic flocculant that selectively reacts with fluoride ions and/or phosphate ions more than with iodide ions into contact with untreated water containing iodide ions and fluoride ions and/or phosphate ions, to obtain an aggregate formed by a reaction between the fluoride ions and/or the phosphate ions and the inorganic flocculant, and a separation step of removing the aggregate from the untreated water to leave the iodide ions in the untreated water, to obtain treated water.