http://rdf.ncbi.nlm.nih.gov/pubchem/patent/TW-425430-B
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_e87c8091fa44af8fd857221e2d3a8304 |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y02P10-20 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01D2251-504 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01D47-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C22B3-065 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C22B7-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C22B7-006 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C22B7-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01D47-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C22B3-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C22B7-00 |
| filingDate | 1996-10-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2001-03-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7dece6643833c9ba5aaeac554d7f15f9 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ac682b75efbc2796ceb81b94e9d61bdd |
| publicationDate | 2001-03-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | TW-425430-B |
| titleOfInvention | Metallurgical dust recycle process |
| abstract | An improved method and apparatus for treating metallurgical dust (e.g. electric are furnace (EAF) dust) and recovering valuable chemical commodities, comprising the steps of: leaching salts such as chloride from the dust with water to create a washed EAF dust; reacting the washed EAF dust in a nitric acid solution resulting in a nearly complete dissolution of the zinc, cadmium, copper, magnesium, calcium, manganese and lead from a filtrate, nitric fumes exuded during this step are recycled into nitric acid by a nitric recycle process; removing iron from the step b filtrate by raising pH in the system with basic zinc carbonate, the resulting iron oxide precipitate can be sent to the furnace as iron ore, zinc reagent goes with the zinc already in the filtrate to be recovered later; removing cadmium, copper and lead in an electrolytic cell, where elemental copper and elemental cadmium are collected at the cathode, and lead is collected at the anode, filtrate entering the next step is free of lead, cadmium and copper; evaporating and decomposing the filtrate to obtain metal oxides and anhydrous calcium nitrate, the nitric gases given off during the evaporation and decomposition are recycled to nitric acid by the nitric recycle; leaching the solid residue with water separates calcium nitrate in a marketable form; removing the zinc from the magnesium and manganese by leaching the residue with an amine solution; stripping the filtrate of ammonium carbonate to yield zinc precipitated as a zinc oxycarbonate; dividing the zinc oxycarbonate obtained in the heat strip into a first stream and a second stream, the first stream serves as a pH adjuster to precipitate iron, the second stream prepares highly pure zinc products for sale, by reacting the zinc complex with acid to produce a zinc product; and separating a residue containing magnesium and manganese by dissolving magnesium in acid, whereby liquid filtrate contains marketable magnesium nitrate or sulfate. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/TW-I614072-B |
| priorityDate | 1995-10-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 287.