Abstract
This preliminary study describes a metallurgical process that will extract, recover and produce REE oxides from beach sands obtained from Ombo, San Vicente, northern Palawan. The beach sands contain REE minerals of allanite and small amounts of monazite. Allanite is a sorosilicate mineral containing rare earths, thorium and uranium. Monazite is the anhydrous phosphate of cerium and the lanthanum group of rare earths with thorium commonly present in replacement for cerium and lanthanum. Collected beach sand were first pan-concentrated in-situ to produce heavy mineral concentrates. Screening using a 32 mesh (0.500 mm) sieve was done at the Nuclear Materials Research Laboratory to remove oversize sand particles. The -32 mesh fraction was treated with bromoform (sp. gr. 2.89) to separate the heavy minerals from siliceous gangue. Grinding to -325 mesh size (0.044mm) followed to liberate the minerals prior to leaching. Two acids leachants were used - concentrated HCl for the first trial and a mixture of concentrated HCl and HNO{sub 3} (10:1 volume ratio) for the second trial. Both leaching trials were carried out at 180{sup o}C for 7 hours or until dry. The resulting leached residues were re-dissolved in concentrated HCl and filtered. Ionquest{sup R} 801, an organophosphorous extractant, was
More>>
Petrache, Cristina A;
Santos, Jr, Gabriel P;
Fernandez, Lourdes G;
Castillo, Marilyn K;
Tabora, Estrellita U;
Intoy, Socorro P;
Reyes, Rolando Y
[1]
- Nuclear Materials Research Section, Atomic Research Division, Philippine Nuclear Research Institute, Diliman Quezon City (Philippines)
Citation Formats
Petrache, Cristina A, Santos, Jr, Gabriel P, Fernandez, Lourdes G, Castillo, Marilyn K, Tabora, Estrellita U, Intoy, Socorro P, and Reyes, Rolando Y.
The recovery of rare earth elements (REE) from beach sands.
Philippines: N. p.,
2005.
Web.
Petrache, Cristina A, Santos, Jr, Gabriel P, Fernandez, Lourdes G, Castillo, Marilyn K, Tabora, Estrellita U, Intoy, Socorro P, & Reyes, Rolando Y.
The recovery of rare earth elements (REE) from beach sands.
Philippines.
Petrache, Cristina A, Santos, Jr, Gabriel P, Fernandez, Lourdes G, Castillo, Marilyn K, Tabora, Estrellita U, Intoy, Socorro P, and Reyes, Rolando Y.
2005.
"The recovery of rare earth elements (REE) from beach sands."
Philippines.
@misc{etde_20616751,
title = {The recovery of rare earth elements (REE) from beach sands}
author = {Petrache, Cristina A, Santos, Jr, Gabriel P, Fernandez, Lourdes G, Castillo, Marilyn K, Tabora, Estrellita U, Intoy, Socorro P, and Reyes, Rolando Y}
abstractNote = {This preliminary study describes a metallurgical process that will extract, recover and produce REE oxides from beach sands obtained from Ombo, San Vicente, northern Palawan. The beach sands contain REE minerals of allanite and small amounts of monazite. Allanite is a sorosilicate mineral containing rare earths, thorium and uranium. Monazite is the anhydrous phosphate of cerium and the lanthanum group of rare earths with thorium commonly present in replacement for cerium and lanthanum. Collected beach sand were first pan-concentrated in-situ to produce heavy mineral concentrates. Screening using a 32 mesh (0.500 mm) sieve was done at the Nuclear Materials Research Laboratory to remove oversize sand particles. The -32 mesh fraction was treated with bromoform (sp. gr. 2.89) to separate the heavy minerals from siliceous gangue. Grinding to -325 mesh size (0.044mm) followed to liberate the minerals prior to leaching. Two acids leachants were used - concentrated HCl for the first trial and a mixture of concentrated HCl and HNO{sub 3} (10:1 volume ratio) for the second trial. Both leaching trials were carried out at 180{sup o}C for 7 hours or until dry. The resulting leached residues were re-dissolved in concentrated HCl and filtered. Ionquest{sup R} 801, an organophosphorous extractant, was added to the filtrate to separate the radioactive thorium from REE. Sodium hydroxide was added to the aqueous phase to precipitate the REE. After filtering the precipitate, it was dissolved in HCl. The acid solution was repeatedly extracted three (3) times with Ionquest{sup R} 801 to remove iron and other contaminants. Ammonium hydroxide was added to the final solution to precipitate the REE, which was then dried in the oven. The precipitate was calcined/roasted in the furnace at two different temperatures for different periods of time to burn off the organic matter and to form oxides. Results of the XRD analysis showed peaks of the calcined precipitate matching with the peaks of lanthanum oxide standard (99.0% min) indicating the presence of this oxide in the precipitate. This precipitate contains {approx}26% REE as analyzed using XRF. (Authors)}
journal = []
volume = {33}
journal type = {AC}
place = {Philippines}
year = {2005}
month = {Apr}
}
title = {The recovery of rare earth elements (REE) from beach sands}
author = {Petrache, Cristina A, Santos, Jr, Gabriel P, Fernandez, Lourdes G, Castillo, Marilyn K, Tabora, Estrellita U, Intoy, Socorro P, and Reyes, Rolando Y}
abstractNote = {This preliminary study describes a metallurgical process that will extract, recover and produce REE oxides from beach sands obtained from Ombo, San Vicente, northern Palawan. The beach sands contain REE minerals of allanite and small amounts of monazite. Allanite is a sorosilicate mineral containing rare earths, thorium and uranium. Monazite is the anhydrous phosphate of cerium and the lanthanum group of rare earths with thorium commonly present in replacement for cerium and lanthanum. Collected beach sand were first pan-concentrated in-situ to produce heavy mineral concentrates. Screening using a 32 mesh (0.500 mm) sieve was done at the Nuclear Materials Research Laboratory to remove oversize sand particles. The -32 mesh fraction was treated with bromoform (sp. gr. 2.89) to separate the heavy minerals from siliceous gangue. Grinding to -325 mesh size (0.044mm) followed to liberate the minerals prior to leaching. Two acids leachants were used - concentrated HCl for the first trial and a mixture of concentrated HCl and HNO{sub 3} (10:1 volume ratio) for the second trial. Both leaching trials were carried out at 180{sup o}C for 7 hours or until dry. The resulting leached residues were re-dissolved in concentrated HCl and filtered. Ionquest{sup R} 801, an organophosphorous extractant, was added to the filtrate to separate the radioactive thorium from REE. Sodium hydroxide was added to the aqueous phase to precipitate the REE. After filtering the precipitate, it was dissolved in HCl. The acid solution was repeatedly extracted three (3) times with Ionquest{sup R} 801 to remove iron and other contaminants. Ammonium hydroxide was added to the final solution to precipitate the REE, which was then dried in the oven. The precipitate was calcined/roasted in the furnace at two different temperatures for different periods of time to burn off the organic matter and to form oxides. Results of the XRD analysis showed peaks of the calcined precipitate matching with the peaks of lanthanum oxide standard (99.0% min) indicating the presence of this oxide in the precipitate. This precipitate contains {approx}26% REE as analyzed using XRF. (Authors)}
journal = []
volume = {33}
journal type = {AC}
place = {Philippines}
year = {2005}
month = {Apr}
}