http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-461117-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0a5833e4922b4538d04b39111878f7e4 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01F7-22 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01F7-22 |
| filingDate | 1936-06-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1937-02-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-461117-A |
| titleOfInvention | Improvements in or relating to a process of recovering alumina from aluminous silicious material containing a substantial proportion of silica |
| abstract | In a process for the recovery of alumina from aluminiferous materials high in silica such as clay, siliceous bauxite, coal ash, blast furnace slag, or feldspar, a portion, say from 5 to 15 per cent, of the initial material is first sintered at say 900--1200 DEG C., with an alkali metal chloride in the presence of steam to form silico-alkali metal-aluminate and liberate hydrochloric acid, and the remainder of the initial material is then sintered, say at 1100--1400 DEG C., with an alkaline-earth metal compound, the silico-alkali metal-aluminate, and an alkali metal compound to obtain sodium or potassium aluminate and calcium or other alkaline-earth metal silicate. The alkali metal compound for the main charge is recovered from the spent lye when alumina is precipitated from the solution of alkali metal aluminate obtained by leaching the furnace product, and the amount of silico-aluminate is calculated to be sufficient to replace losses of alkali in the furnace processes, whilst a substance high in alumina may be added to the charge for the second furnacing operation in order to remedy any deficiency of alumina. In the first furnacing operation, the proportions are so chosen that 1 to 2 mols. of Na2O are present for each mol of Al2O3, and in the second, that 2 mols of CaO are present for each mol. of silica, and 1 to 1,7 mols. of Na2O are present for each mol. of alumina. Alumina may be precipitated from the solution of sodium aluminate by the Bayer process, and a portion of the spent lye may be used to dissolve sodium aluminate from the furnace product. |
| priorityDate | 1936-06-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 22.