http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-995052-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1e70c0aeade92d7571d955d3b90ea06e |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C22B13-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C22B13-06 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C22B13-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C22B13-02 |
| filingDate | 1963-06-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1965-06-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-995052-A |
| titleOfInvention | Improvements in or relating to the recovery of metallic lead |
| abstract | Lead is recovered from a lead product, especially a by-product, in the manufacture of tetraalkyllead compound by reacting on alkyl chloride with lead monosodium alloy, which contains finely divided metallic lead, water and lesser amounts of PbO and PbS, by mixing the lead product with 0.4-1.2% by weight NaOH based on the metallic lead, drying the mixture by heating it at 100-160 DEG C. with agitation until the water content is reduced to 1-6% by weight, heating the dried mixture in a reverberatory furnace at 650-1200 DEG C. to melt the lead and convert PbO and PbS to metallic lead, and separating the molten lead from the reaction mixture. The lead product usually consists of by weight 76-89% of finely divided metallic lead, 9-19% of water, 0-0.05% NaOH, up to 2% total of PbO and PbS and 0-4.5% total of graphite and aluminium hydroxide (latter present when by-product of tetramethyllead). The NaOH may be mixed with the lead product in the form of an aqueous solution or as anhydrous flake. The drying may be effected continuously in a steam-heated drier containing a screw type agitator and conveyer. Up to 10% of lead dross, based on the weight of the lead product, may be added to the dried mixture in the furnace, the dross consisting of by weight 86-97% of metallic lead, 2-8% PbO and 1-6% PbS. U.S.A. Specifications 2,691,575, 2,692,197 and 2,899,296 are referred to. |
| priorityDate | 1962-06-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 22.