KR960031351A - Separation and Regeneration of Rare Earths from Mixed Rare Earths Residues - Google Patents

Abstract

The mixed rare earth residue composed mainly of the rare earth fluoride compound is made into an acidic suspension, followed by sieving and magnetic separation to obtain a clay fluoride concentrate. Sodium hydroxide is added to the rare earth residue and heated at 150 ° C. for 30 minutes to remove from the mixed clay residue. It is a method of economically separating and producing expensive rare earths, and at the same time, it is an economic method of directly producing dissolved fluorine remover.

Description

Separation and Regeneration of Rare Earths from Mixed Rare Earths Residues

Since this is an open matter, no full text was included.

Claims (11)

The waste residue containing the fluoride rare earth compound as a main component is separated and concentrated by physical treatment; Treating the concentrated residue with a chemical treatment method; A process for separating rare earths from mixed rare earth-containing residues comprising a step. The rare earth separation method according to claim 1, further comprising a step of making the mixed rare earth residue into an acidic suspension having a pH of 4 or less before the physical treatment. 3. The method of claim 2, further comprising the step of sonicating said suspension prior to performing said physical treatment method. The method of claim 1, wherein the physical treatment is a sieve. The rare earth separation method according to claim 1, wherein the physical treatment method is magnetic separation. The rare earth separation method according to claim 1, wherein the chemical treatment method is an alkali method. 7. The method for separating rare earth according to claim 6, wherein the alkali method is a caustic soda method. The rare earth separation method of claim 7, wherein the caustic soda is heated at 100 to 200 ° C. for 10 to 60 minutes by adding caustic soda in a weight ratio of 0.5 to 3 times. A method of treating a wastewater treatment residue comprising a fluorinated rare earth compound using the method of claim 1. A rare earth production method comprising the step of separating the rare earth from the residue of the waste water containing the rare earth compound. A dissolved fluorine ion remover containing a rare earth is added to a fluorine ion-containing solution to remove dissolved fluorine ions, thereby producing a mixed rare earth residue composed mainly of the rare fluoride compounds, and physically treating the mixed rare earth residue composed mainly of the rare fluoride compounds. Concentration by separation; Treating the concentrated mixed rare earth residue with caustic soda to produce a mixed rare earth solution and a solution of sodium fluoride; Preparing a dissolved fluorine ion remover using the mixed rare earth solution; A method of regenerating a dissolved fluorine ion remover comprising rare earth comprising processes. ※ Note: The disclosure is based on the initial application.