Method for the separation of a mixture of fine particles
US4191727A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 22, 1978 |
| Grant date | Mar 4, 1980 |
| Priority date | — |
| Expiry date | May 22, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB03B1/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for the separation of a mixture of fine particles wherein the fraction to be separated has a surface which is more reactive chemically than the remaining fractions by grinding the mixture so that the fraction to be separated has a particle size of less than 50.mu., suspending the ground mixture at a temperature less than 100.degree. C. in a diluted aqueous solution of zirconium oxychloride or zirconium oxynitrate, allowing the solution to settle and decanting the deposited material and then adding a base to the decantate to precipitate the residue therein. This process allows selective separation of the fractions having a more chemically reactive surface without the use of complex equipment and with a minimum use of expensive additives and chemicals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.