Production of nanoparticulate compressed tablets (pellets) from synthetic or natural materials using a specially developed grinding and compressing method

Patent metadata

Field	Value
Publication number	US-11656158-B2
Application number	US-201816619501-A
Country	US
Kind code	B2
Filing date	Jun 5, 2018
Priority date	Jun 8, 2017
Publication date	May 23, 2023
Grant date	May 23, 2023

Abstract

A method for producing nanoparticulate compressed tablets/pellets from synthetic and/or natural materials, and compressed tablets/pellets produced using the method for producing nanoparticulate compressed tablets/pellets from synthetic and/or natural materials and to uses thereof.

First claim

The invention claimed is:

1. A method for producing nanoparticulate compressed tablets/pellets from synthetic and/or natural materials comprising the steps of:
producing a fine-ground powder (p) with grain size<75 μm,
wet grinding (M) the fine-ground powder (p) in a grinding arrangement, jet-mill grinding arrangement and/or high-energy ball mill grinding arrangement to produce a ground material (p M ) with a particle size in the range of 30-150 nm and with a D 90 <1 μm;
transfering and drying, thermal drying or freeze-drying (G) the ground material (p M ) to produce a dried nanopowder (p MG );
re-homogenizing (R) the dried nanopowder (p MG ) to produce a dried and re-homogenized nanopowder (p MGR ), and
pressing (P) at least an aliquot of dried and re-homogenized nanopowder (p MGR ) into a tablet/pellet (t) in a high pressure press in the working range of 2 to 80 tons without addition of binder.

2. A method for producing nanoparticulate compressed tablets/pellets according to claim 1 ,
wherein
the pressing (P) in the high pressure press occurs with a polished sapphire, glass and/or diamond disk between a pressing tool and the aliquot of dried and re-homogenized nanopowder (p MGR ) and wherein the pressing tool is shaped according to the area of application.

3. A method for producing nanoparticulate compressed tablets/pellets according to claim 1 ,
wherein
the wet grinding (M) is carried out with a liquid, wherein the liquid is water and/or an organic solvent.

4. A method for producing nanoparticulate compressed tablets/pellets according to claim 1 , wherein the pressing (P) of the aliquot of dried and re-homogenized nanopowder (p MGR ) takes place in a high pressure press in the working range of 3 to 40 tons.

5. A method for producing nanoparticulate compressed tablets/pellets according to claim 1 , wherein the pressing (P) of the aliquot of dried and re-homogenized nanopowder (p MGR ) takes place in a high pressure press in the working range of 5-20 tons.

6. Compressed tablets/pellets made by the method of claim 1 .

7. A method for calibration of equipment for solid-state analysis, the method comprising first using a compressed tablet/pellet produced according to claim 1 as a reference material for the equipment for solid-state analysis or as a medium for direct solid-state analysis.

Assignees

• Univ Kiel Christian Albrechts

Inventors

• Garbe-Schoenberg Carl-Dieter
• Mueller Samuel
• Nordstad Simon

Classifications

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title

• G01N1/286 Primary

  involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising (microtomes G01N1/06; pulverising in general B02C; mixing in general B01F) · CPC title

• B22F1/056

  Submicron particles having a size above 100 nm up to 300 nm · CPC title

• G01N2001/2866

  Grinding or homogeneising · CPC title

• C04B35/62695 Primary

  Granulation or pelletising (devices for shaping artificial aggregates from ceramic mixtures B28B1/004) · CPC title