초록 ▼

Fluorine or fluorine compounds dissolved at low concentrations in water are efficiently separated by use of hydrated rare earth oxides or insoluble hydrated rare earth salts, particularly hydrous rare earth fluorides or hydrous rare earth phosphates, as the adsorbent. By bringing fluorine dissolved

Fluorine or fluorine compounds dissolved at low concentrations in water are efficiently separated by use of hydrated rare earth oxides or insoluble hydrated rare earth salts, particularly hydrous rare earth fluorides or hydrous rare earth phosphates, as the adsorbent. By bringing fluorine dissolved water of pH 2-7 into contact with said adsorbent, fluorine is adsorbed on the adsorbent, and the adsorbed fluorine can be desorbed by contact with an alkali solution of pH 10 to 14 to regenrate said adsorbent. Also, by addition of a precipitating agent for fluorine to the desorbed solution, fluorine compounds can be separated by precipitation and the filtrate can be reused as the regenerating solution for the adsorbent.

대표청구항 ▼

A process for separating dissolved fluorine or fluorine compounds, which comprises: bringing a solution having a pH ranging from 2 to 5 and containing fluorine or fluorine compounds dissolved thereinto into contact with a hydrated rare earth oxide or insoluble hydrated rate earth salt as an adsorben

A process for separating dissolved fluorine or fluorine compounds, which comprises: bringing a solution having a pH ranging from 2 to 5 and containing fluorine or fluorine compounds dissolved thereinto into contact with a hydrated rare earth oxide or insoluble hydrated rate earth salt as an adsorbent.