http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-113697858-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_641c60eb9d774e922d3f8219b74e7ec4 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01G41-003 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01G41-00 |
| filingDate | 2021-07-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_bc985f79b9299b92665f9687e808ac70 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_fcdeaf776d6b858feac823f00f50a592 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_cf9538e84fbbcd687a33e79e930b824b |
| publicationDate | 2021-11-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-113697858-A |
| titleOfInvention | A kind of preparation method of tungstic acid |
| abstract | The invention discloses a method for preparing tungstic acid, which adopts an extraction method to replace multiple processes such as precipitation of artificial scheelite and acid decomposition of artificial scheelite in traditional processes. The industrial sodium tungstate solution uses the classical precipitation method to remove impurities such as arsenic, phosphorus, silicon, etc., and then adjusts the acidity of the sodium tungstate solution to pH 2-3, and then mixes the acidified organic phase with the sodium tungstate solution and extracts, After phase separation, tungsten is extracted into the organic phase, and the organic phase is back-extracted with hydrogen peroxide and citric acid to obtain a back-extraction solution, which is heated and boiled until there are no small bubbles, cooled, and allowed to stand for precipitation and filtration to obtain tungstic acid. The tungstic acid prepared by the invention meets the product requirements of H 2 WO 4-0 grade of tungstic acid "YS/T692-2009". |
| priorityDate | 2021-07-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 47.