http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CA-2103679-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_8c149d5de29f0ada53965a2a657e6365 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01F7-50 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01F7-30 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01F7-30 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01F7-50 |
| filingDate | 1992-02-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0917579cc992007fa34d17c9ba45594a http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_40c29d9eef84b2835113739b187687c4 |
| publicationDate | 1992-08-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CA-2103679-A1 |
| titleOfInvention | Process for recovering aluminium and fluorine from fluorine containing waste materials |
| abstract | Aluminium and fluorine are recovered from fluorine containing waste materials from the production of aluminium metal (FCWM) as AlF2OH hydrate by a process comprising: leaching FCWM with dilute sulphuric acid at a pH value within the range 0-3, if needed adding aluminium in an acid soluble form; adjusting the pH value of the aqueous phase to a value within the range 3.7-4.1 at the end of the leaching period by addition of a caustic aqueous solution; precipitating silica at a temperture not exceeding 60 ·C; separating the reaction mixture into a solid phase containing precipitated silica and non-soluble residues of the FCWM and a purified solution; and precipitating AlF2OH hydrate from the purified solution at a temperature within the range 90-100 ·C and at a pH value not exceeding about 4.1 by controlled continuous addition of an aqueous caustic solution. Reducing and/or non-oxidizing operating conditions are maintained during all these process steps. The precipitated AlF2OH may be calcined at a temperature within the range 500-600 ·C to produce AlF3, Al2O3, which is expedient for use in processes for the production of aluminium metal by electrolytic production of alumina. |
| priorityDate | 1991-02-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 55.