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A method for extracting fluoride ions in solution

A fluoride ion extraction technology, applied in the direction of liquid solution solvent extraction, separation method, solvent extraction, etc., can solve the problems of inefficient extraction of fluoride ion, increase production cost, increase operation process, etc., and achieve good and effective separation and extraction effect The effect of recovery and high extraction rate

Active Publication Date: 2021-02-02
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In summary, amines and phenols cannot efficiently extract fluoride ions as extraction agents, so multi-stage extraction is required during extraction, which increases the operation process and increases the production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] For the extraction of sulfur-phosphorus mixed acid leaching solution of phosphate rock, the fluorine ion concentration of the phosphate rock leach solution is 0.364g / L. The volume fraction of phosphoric acid monoester in the oil phase is 30%, and the volume fraction of polyorganosiloxane is 70%. The oil phase is mixed and left to stand for 5 minutes before being used as an extractant. The extractant and phosphate rock leaching solution were mixed according to the volume ratio of 1:5, and the extraction was stirred rapidly at 50°C for 60 minutes. According to the GB / T1872-1995 fluoride ion selective electrode method, the extraction efficiency reached 94.6%.

Embodiment 2

[0031] For the extraction of fluorine-containing wastewater, the fluoride ion concentration in the fluoride-containing wastewater is 0.384g / L. The volume fraction of phosphoric acid monoester in the oil phase is 50%, and the volume fraction of polyorganosiloxane is 50%. The oil phase is mixed and left to stand for 6 minutes before being used as an extractant. The extractant and phosphate rock leaching solution were mixed according to the volume ratio of 1:5, and the extraction was stirred rapidly at 40°C for 40 minutes. According to the GB / T 1872-1995 fluoride ion selective electrode method, the extraction efficiency reached 97.8%.

Embodiment 3

[0033] For the extraction of sulfur-phosphorus mixed acid leaching solution of phosphate rock, the fluorine ion concentration of the phosphate rock leach solution is 0.364g / L. The volume fraction of phosphoric acid monoester in the oil phase is 60%, the volume fraction of polyorganosiloxane is 40%, and the oil phase is mixed and left to stand for 7 minutes before being used as an extractant. The extractant and phosphate rock leachate were mixed according to the volume ratio of 1:5, and the extraction was carried out under rapid stirring at 60°C for 60 minutes. According to the GB / T1872-1995 fluoride ion selective electrode method, the extraction efficiency reached 98.0%.

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Abstract

The invention discloses a method for extracting fluoride ions in a solution, which comprises the following steps: 1) pretreating the solution to be extracted to obtain product A; 2) mixing a phosphate organic solvent and a silicon-containing organic solvent to obtain product B ;3) Add product B to product A for extraction reaction. The invention not only has the characteristics of good separation and extraction effect, good selectivity, cleaner and lower cost, but also has the characteristics of high extraction efficiency and simple operation.

Description

technical field [0001] The invention relates to a method for extracting fluoride ions, in particular to a method for extracting fluoride ions in a solution. Background technique [0002] Fluorine is a halogen chemical element, its chemical symbol is F, its atomic number is 9, and its molecular formula is F 2 . Due to the small size of the atom, 9 mutually repulsive electrons are squeezed out, so it is the most active element among non-metallic elements. It is a strong oxidant, fluorinating agent, extremely corrosive, highly toxic, and corrosive in the halogen group. The most sexual and toxic. But its compounds are stable and versatile, such as the corrosion-resistant "king of plastics" polytetrafluoroethylene. Fluorine is an indispensable trace element in the human body, but because fluorine and some of its compounds are toxic and highly corrosive, once ingested in excess, it will cause serious harm to human health. Fluorine and its compounds can inhibit the catalytic fu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D11/04
CPCB01D11/04B01D11/0492
Inventor 陈前林左永辉
Owner GUIZHOU UNIV
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