http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CA-2815708-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0b75a05785dbfd86d27a87ddcdc5a524 |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y02P10-20 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C22B34-36 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C22B3-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C22B3-08 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C22B3-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C22B34-36 |
| filingDate | 2011-11-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_839be76a0b3505aa50a2ace41a00eb3b http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e20735c34309185c85cd62f232e0d94e |
| publicationDate | 2012-06-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CA-2815708-A1 |
| titleOfInvention | Method for extracting tungsten from scheelite |
| abstract | Disclosed is a method for extracting tungsten from scheelite, which comprises: introducing mixed acid consisted of sulfuric acid and phosphoric acid into a decomposition reactor, heating to 70-100?, and then adding scheelite, maintaining the solid-liquid ratio at 3:1-8:1L/kg, filtrating after 1-6h of reaction, crystallizing the obtained filtrate which is compensated with sulfuric acid consumed by the reaction to obtain phosphotungstic acid crystal, dissolving phosphotungstic acid crystal in water and transforming it to obtain ammonium tungstate solution containing 200-300g/L of WO3, which is used for preparing APT, while returning the obtained crystal mother liquor for ore leaching after being compensated with phosphoric acid and water to the initial level. The invention saves cost of phosphorus-removal reagent and loss of Tungsten; is capable of high efficient scheelite leaching at normal pressure, and overcomes the problems such as Cl- corrosion and heavy volatilization of HCl in traditional acid decomposition process; realizes the recycling of phosphoric acid in general, and greatly reduces the cost of leaching and the quantity of wastewater discharging; and has short flow process, convenient operation, and is adaptive for industrial application. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-114427039-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-116143174-B http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-116143174-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-114427039-B |
| priorityDate | 2010-12-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 42.