C01F 7/0646
Separation of the insoluble residue
Official title: Separation of the insoluble residue, e.g. of red mud
C01F7/0646 (Separation of the insoluble residue) appears on 75 US grants and 48 published applications in this corpus.
Search patents in C01F- Granted patents
- 75
- Published applications
- 48
- Assignees
- 30
- Inventors
- 135
- Latest grant
- 20 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 5 | 0 |
| 1995 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 5 | 0 |
| 1999 | 1 | 0 |
| 2000 | 5 | 0 |
| 2001 | 2 | 0 |
| 2002 | 3 | 1 |
| 2003 | 4 | 1 |
| 2004 | 1 | 3 |
| 2005 | 0 | 0 |
| 2006 | 1 | 3 |
| 2007 | 1 | 3 |
| 2008 | 0 | 2 |
| 2009 | 2 | 2 |
| 2010 | 2 | 1 |
| 2011 | 1 | 2 |
| 2012 | 2 | 5 |
| 2013 | 0 | 5 |
| 2014 | 4 | 2 |
| 2015 | 3 | 0 |
| 2016 | 1 | 6 |
| 2017 | 1 | 3 |
| 2018 | 1 | 0 |
| 2019 | 3 | 2 |
| 2020 | 0 | 3 |
| 2021 | 3 | 0 |
| 2022 | 1 | 2 |
| 2023 | 1 | 1 |
| 2024 | 1 | 0 |
| 2025 | 1 | 0 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Acid wash of red mud (bauxite residue)20 Jan 2026US 12,528,709 B2Worcester Polytechnic Institute
- Use of calcium fluoride in the bayer process29 Jul 2025US 12,371,337 B2Rio Tinto Alcan International Limited
- Acid wash of red mud (bauxite residue)30 Jul 2024US 12,049,409 B2Worcester Polytechnic Institute
- Systems and methods for alumina production21 Feb 2023US 11,584,657 B2Solenis Technologies, L.P.
- Method for aluminum-enhanced dealkalization of red mud and separation and recovery of aluminum and iron17 May 2022US 11,332,380 B2Kunming University of Science and Technology
- Method for resource recovery from a bauxite residue6 Aug 2026US 2026/0225111 A1Ermafa Environmental Technologies GmbH
- Acid wash of red mud (bauxite residue)16 Feb 2023US 2023/0051612 A1Worcester Polytechnic Institute
- Acid wash of red mud (bauxite residue)16 Jun 2022US 2022/0185688 A1Worcester Polytechnic Institute
- Use of Calcium Fluoride in the Bayer Process5 May 2022US 2022/0135417 A1Rio Tinto Alcan International Limited
- Method for aluminum-enhanced dealkalization of red mud and separation and recovery of aluminum and iron24 Sep 2020US 2020/0299145 A1Kunming University of Science and Technology
Most cited
By later US patents
- Polymers containing hydroxamic acid groups for reduction of suspended solids in bayer process streams62US 4,767,540 AAmerican Cyanamid Company · 1988
- Rheology modification of settled solids in mineral processing44US 6,365,116 B1Nalco Chemical Company · 2002
- Recovery of alumina from bauxite43US 5,008,089 AAllied Colloids Limited · 1991
- Use of dextran as a filtration aid for thickener overflow filtration in Kelly filters in the Bayer process29US 5,091,159 ANalco Chemical Company · 1992
- Process for settling red mud in the digestion of bauxite28US 3,975,496 AAllied Colloids Limited · 1976