Methods to recover cesium or rubidium from secondary ore

Patent metadata

Field	Value
Publication number	US-9458524-B2
Application number	US-201414191468-A
Country	US
Kind code	B2
Filing date	Feb 27, 2014
Priority date	Mar 5, 2013
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

A method to recover cesium, rubidium, or both from secondary ore is described and involves using scans and sorting techniques. Refined secondary ore is further described.

First claim

The invention claimed is:

1. A method to recover cesium, rubidium, or both from secondary ore, wherein said secondary ore comprises 25 wt % Cs 2 O or less based on overall weight of said secondary ore and the majority of said secondary ore comprise pieces having at least one dimension that is over 5 inches (12.7 cm),
said method comprising:
obtaining crushed ore from said secondary ore and separating into at least three different size fractions, wherein said crushed ore comprising individual pieces, each having a size capable of passing through a U.S. standard sieve mesh/screen opening of 3 inches (76.2 mm);
conducting an initial calibration step, wherein before said passing of said crushed ore through a sorter, passing through, as size fractions, known rocks and minerals having size fractions that are the same as the at least three different size fractions of separated secondary ore, and that are representative of the rocks and minerals in said secondary ore to be sorted so as to calibrate said sorter, for each size fraction, with respect to what is representative of a “Grade 1 piece” or what is representative of a “Grade 2 piece” or both based on scanned properties of atomic number or material density or both;
setting the sorter to sort for a desired size fraction selected from one of said at least three different size fractions;
passing said desired size fraction of said crushed ore through said sorter to conduct a sorting at a feed rate of at least 1 ton/hour, wherein said sorter determines whether each individual piece of crushed ore is said “Grade 1 piece” or said “Grade 2 piece”, based on said sorter conducting at least one scan of each individual piece and determining atomic number or material density or both of each individual piece, wherein said “Grade 1 piece” comprises Cs 2 O, or Cs 2 O and Rb 2 O together, in an amount of at least 10% based on the weight of said individual piece and said “Grade 2 piece” is any of said crushed ore that is not a “Grade 1 piece”;
separating said Grade 1 pieces from said Grade 2 pieces, whereby wt % Cs 2 O of said Grade 1 pieces is at least 10% by weight higher than wt % Cs 2 O in said secondary ore, and wherein said secondary ore comprises pollucite, nanpingite, carnallite, rhodozite, pezzottaite, rubicline, borate ramanite, beryls, voloshonite, cesstibtantite, avogadrite, margaritasite, kupletskite, nalivkinite, petalite, spodumene, lepidolite, biotite, mica, muscovite, feldspar, microcline, Li-muscovite, lithiophilite, amblygonite, illite, cookeite, albite, analcime, squi, amphiboles, lithian mica, amphibolite, lithiophospahe, apatite, londonite, or any combinations thereof.

2. The method of claim 1 , further comprising a second sorting step comprising passing said Grade 2 pieces through a second sorter, which is the same or different from said sorter, wherein said second sorter determines whether each individual piece of said Grade 2 pieces is a “Grade 2A piece” or “Grade 2B piece”, based on said second sorter conducting at least one scan of each individual piece and determining atomic number or material density or both of each individual piece, wherein said “Grade 2A piece” comprises Cs 2 O and Rb 2 O in an amount of at least 4% based on the weight of said individual piece, and said “Grade 2B piece” is any Grade 2 piece that is not a Grade 2A piece and then separating said Grade 2A pieces from said Grade 2B pieces.

3. The method of claim 2 , wherein said second sorter is set such that said Grade 2A piece is determined based on an atomic number of at least 50.

4. The method of claim 2 , wherein said second sorter is set such that said Grade 2A piece is determined based on an atomic number of from 60 to 150.

5. The method of claim 1 , further comprising extracting cesium, rubidium or both by subjecting said Grade 1 pieces to at least one acid treatment.

6. The method of claim 1 , wherein said secondary ore comprises 15 wt % Cs 2 O or less.

7. The method of claim 1 , wherein said secondary ore comprises 1 wt % to 15 wt % Cs 2 O.

8. The method of claim 1 , wherein said secondary ore comprises 1 to 5 wt % pollucite based on the weight of said secondary ore.

9. The method of claim 1 , wherein said first sorter detects and selects said Grade 1 piece based on an atomic number of at least 80.

10. The method of claim 1 , wherein said first sorter detects and selects said Grade 1 piece based on an atomic number of from 80 to 150.

11. The method of claim 1 , wherein said method captures at least about 40% by weight of available Cs 2 O present in said secondary ore.

12. The method of claim 1 , wherein said method captures at least about 10% by weight of available Rb 2 O present in said secondary ore.

13. The method of claim 2 , wherein said second sorting captures at least about 10% by weight of available Cs 2 O present in said secondary ore, based on weight of said secondary ore at start.

14. The method of claim 2 , wherein said second sorting captures at least about 20% by weight of available Rb 2 O present in said secondary ore, based on weight of said secondary ore at start.

15. The method of claim 2 , wherein said second sorting captures at least about 65% by weight of available Rb 2 O present in said secondary ore, based on weight of said secondary ore at start.

16. The method of claim 2 , wherein said first sorting and said second sorting combined capture at least 85% by weight of available Cs 2 O present in said secondary ore, based on weight of said secondary ore at start.

17. The method of claim 1 , wherein said first sorter conducts at least 2 scans of each individual piece, wherein one scan determines atomic number and the other scan determines material density.

18. The method of claim 2 , wherein second sorter is set such that said Grade 2A is determined based on atomic number and material density.

19. The method of claim 1 , wherein said “Grade 1 piece” is determined based on being within 10% of the scanned property of atomic number or material density or both for the representative Grade 1 piece for that size fraction.

Assignees

• Cabot Corp

Inventors

• Bakke Bart
• Deveau Claude

Classifications

• C22B26/10 Primary

  Obtaining alkali metals · CPC title

• C22B3/04

  by leaching (C22B3/18 takes precedence) · CPC title

• Y10T428/2982

  Particulate matter [e.g., sphere, flake, etc.] · CPC title

• G01N2223/635

  fluids, granulates · CPC title

• B02C23/08

  Separating or sorting of material, associated with crushing or disintegrating (B02C23/18 takes precedence {; beater mills combined with sifting devices B02C13/13, B02C13/14; for tumbling mills B02C17/1835}) · CPC title