Method of ball milling aluminum metaphosphate

Patent metadata

Field	Value
Publication number	US-9968941-B2
Application number	US-201514723737-A
Country	US
Kind code	B2
Filing date	May 28, 2015
Priority date	May 30, 2014
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A method of preparing an aluminum metaphosphate (ALMP) particulate product includes charging a milling chamber of a ball mill with grinding media and loading an ALMP feedstock into the milling chamber. The ALMP feedstock is milled with the grinding media into ALMP particles at a particle reduction index in a range from 0.25 to 0.5. At a plurality of time steps during a period in which the milling is carried out, a fine fraction of the ALMP particles is removed from the milling chamber while a coarse fraction of the ALMP particles remains in the milling chamber for additional milling. An ALMP particulate product with a particle size distribution having a median particle size in a range from 100 μm to 700 μm is prepared from the ALMP particles removed from the milling chamber.

First claim

The invention claimed is:

1. A method of preparing an aluminum metaphosphate particulate product, comprising:
charging a milling chamber of a ball mill with grinding media;
loading an aluminum metaphosphate feedstock into the milling chamber;
milling the aluminum metaphosphate feedstock with the grinding media into aluminum metaphosphate particles at a particle reduction index in a range from 0.25 to 0.5;
at a plurality of time steps during a period in which the milling is carried out, removing a fine fraction of the aluminum metaphosphate particles from the milling chamber while leaving a coarse fraction of the aluminum metaphosphate particles in the milling chamber for additional milling; and
preparing an aluminum metaphosphate particulate product with a particle size distribution having a median particle size in a range from 100 μm to 700 μm from the aluminum metaphosphate particles removed from the milling chamber.

2. The method of claim 1 , wherein charging the milling chamber with grinding media comprises selecting grinding media made of a ceramic material.

3. The method of claim 2 , wherein selecting grinding media made of a ceramic material comprises selecting grinding media made of alumina.

4. The method of claim 2 , wherein charging the milling chamber comprises selecting a milling chamber lined with a ceramic material.

5. The method of claim 4 , wherein selecting a milling chamber lined with a ceramic material comprises selecting a milling chamber lined with alumina.

6. The method of claim 1 , wherein the fine fraction of aluminum metaphosphate particles comprises particle sizes in a range from 100 μm to 700 μm.

7. The method of claim 1 , wherein the aluminum metaphosphate particulate product has a particle size distribution with a median particle size of greater than 100 μm.

8. The method of claim 1 , wherein the aluminum metaphosphate feedstock has an aggregate particle size range of 0.1 mm to 5.0 mm.

9. The method of claim 1 , wherein the fine fraction is removed at the plurality of time steps without pausing the milling of the aluminum metaphosphate feedstock.

10. The method of claim 1 , wherein the particle size distribution of the aluminum metaphosphate particulate product has a median particle size in a range from 400 μm to 700 μm.

11. The method of claim 10 , wherein the grinding media comprises a plurality of individual balls, each ball having a size 10 to 15 times larger than the largest particle in the aluminum metaphosphate feedstock.

12. The method of claim 10 , wherein an input specific energy to the ball mill during the milling is in a range from 0.5 to 2 kWh/ton.

Assignees

• Corning Inc

Inventors

• Hill Kimberly Errin
• Murtagh Martin Joseph

Classifications

• B02C23/14 Primary

  with more than one separator · CPC title

• C01P2004/51

  Particles with a specific particle size distribution · CPC title

• C01B25/44 Primary

  Metaphosphates · CPC title

• B02C17/10

  with one or a few disintegrating members arranged in the container · 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