IT9005127A1 - PROCEDURE FOR THE EXTRACTION OF ZINC, LEAD AND CADMIUM FROM DUST OF FUME ABATEMENT FROM ELECTRIC OVENS. - Google Patents
PROCEDURE FOR THE EXTRACTION OF ZINC, LEAD AND CADMIUM FROM DUST OF FUME ABATEMENT FROM ELECTRIC OVENS.Info
- Publication number
- IT9005127A1 IT9005127A1 IT005127A IT512790A IT9005127A1 IT 9005127 A1 IT9005127 A1 IT 9005127A1 IT 005127 A IT005127 A IT 005127A IT 512790 A IT512790 A IT 512790A IT 9005127 A1 IT9005127 A1 IT 9005127A1
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- Prior art keywords
- solution
- ammonia
- carbon dioxide
- treatment
- separation
- Prior art date
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims description 18
- 239000011701 zinc Substances 0.000 title claims description 18
- 229910052725 zinc Inorganic materials 0.000 title claims description 17
- 229910052793 cadmium Inorganic materials 0.000 title claims description 12
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 title claims description 11
- 238000000605 extraction Methods 0.000 title claims description 8
- 239000003517 fume Substances 0.000 title description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 42
- 238000000034 method Methods 0.000 claims description 33
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 32
- 229910021529 ammonia Inorganic materials 0.000 claims description 21
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 18
- 239000001569 carbon dioxide Substances 0.000 claims description 16
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 16
- 239000007787 solid Substances 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 238000002386 leaching Methods 0.000 claims description 12
- 150000002739 metals Chemical class 0.000 claims description 11
- 235000019270 ammonium chloride Nutrition 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 8
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 7
- 239000001099 ammonium carbonate Substances 0.000 claims description 7
- MFEVGQHCNVXMER-UHFFFAOYSA-L 1,3,2$l^{2}-dioxaplumbetan-4-one Chemical compound [Pb+2].[O-]C([O-])=O MFEVGQHCNVXMER-UHFFFAOYSA-L 0.000 claims description 6
- 229910000003 Lead carbonate Inorganic materials 0.000 claims description 6
- FMRLDPWIRHBCCC-UHFFFAOYSA-L Zinc carbonate Chemical compound [Zn+2].[O-]C([O-])=O FMRLDPWIRHBCCC-UHFFFAOYSA-L 0.000 claims description 6
- 235000012501 ammonium carbonate Nutrition 0.000 claims description 6
- 235000004416 zinc carbonate Nutrition 0.000 claims description 6
- 239000011667 zinc carbonate Substances 0.000 claims description 6
- 229910000010 zinc carbonate Inorganic materials 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- HWSZZLVAJGOAAY-UHFFFAOYSA-L lead(II) chloride Chemical compound Cl[Pb]Cl HWSZZLVAJGOAAY-UHFFFAOYSA-L 0.000 claims description 5
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 4
- 238000009835 boiling Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 229910021653 sulphate ion Inorganic materials 0.000 claims description 4
- 159000000007 calcium salts Chemical class 0.000 claims description 3
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 150000001805 chlorine compounds Chemical class 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 claims description 2
- 230000008020 evaporation Effects 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims 2
- 238000001354 calcination Methods 0.000 claims 2
- 238000006386 neutralization reaction Methods 0.000 claims 2
- 238000004064 recycling Methods 0.000 claims 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims 1
- 229910000019 calcium carbonate Inorganic materials 0.000 claims 1
- 150000004679 hydroxides Chemical class 0.000 claims 1
- 235000013980 iron oxide Nutrition 0.000 claims 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 claims 1
- 150000002736 metal compounds Chemical class 0.000 claims 1
- 229910000000 metal hydroxide Inorganic materials 0.000 claims 1
- 229910044991 metal oxide Inorganic materials 0.000 claims 1
- 150000004706 metal oxides Chemical class 0.000 claims 1
- 238000002156 mixing Methods 0.000 claims 1
- 229910052791 calcium Inorganic materials 0.000 description 7
- 239000011575 calcium Substances 0.000 description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- NEHMKBQYUWJMIP-UHFFFAOYSA-N chloromethane Chemical compound ClC NEHMKBQYUWJMIP-UHFFFAOYSA-N 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 229910000640 Fe alloy Inorganic materials 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 150000004673 fluoride salts Chemical class 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229920002359 Tetronic® Polymers 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Description
DESCRIZIONE dell’invenzione avente per titolo: PROCEDIMENTO _ PER L’ESTRAZIONE DI ZINCO, PIOMBO E CADMIO DA POLVERI DI AB-BATTIMENTO FUMI DA FORNI ELETTRICI DESCRIPTION of the invention entitled: PROCEDURE _ FOR THE EXTRACTION OF ZINC, LEAD AND CADMIUM FROM AB POWDERS - SMOKE BATCHING FROM ELECTRIC OVENS
RIASSUNTO - Procedimento per l'estrazione di zinco* piombo e cadmio da polveri di abbattimento fumi da forni elettrici e comprendente le fasi di trattamento dei suddetti materiali con soluzione di carbonato di ammonio, di trattamento del solido desolfatato con cloruro di ammonio solido a temperatura elevata, di successiva lisciviazione con soluzione ad alta concentrazione di ioni cloruri e di recupero dei metalli dalla soluzione ottenuta. SUMMARY - Process for the extraction of zinc * lead and cadmium from fume abatement powders from electric furnaces and including the phases of treatment of the aforementioned materials with ammonium carbonate solution, of treatment of the desulfated solid with solid ammonium chloride at high temperature , of subsequent leaching with a solution with a high concentration of chloride ions and recovery of the metals from the solution obtained.
FONDAMENTI DELL'INVENZIONE - L'invenzione BÌ riferisce al recupero dei metalli presenti nelle polveri di abbattimento fumi da forni elettrici in modo da ottenere un residuo costituìtq_ principalmente da ossido ferrico riutilizzabile come materia prima per la metallurgia ferrosa e comunque con bassi contenuti di metalli pesanti. BACKGROUND OF THE INVENTION - The invention B1 refers to the recovery of the metals present in the fume abatement powders from electric furnaces in order to obtain a residue consisting mainly of ferric oxide reusable as raw material for ferrous metallurgy and in any case with low contents of heavy metals .
Le polveri di abbattimento fumi da forni elettrici hanno una composizione tipica come da seguente tabella: The fume abatement powders from electric ovens have a typical composition as per the following table:
Ferro 20-40 % Iron 20-40%
Zinco 5-35 % Zinc 5-35%
Piombo 1-10 % Lead 1-10%
Cadmio 0,02-0,1 % Cadmium 0.02-0.1%
Calcio 1-20 % Football 1-20%
Solfati 0,5-7 % Sulphates 0.5-7%
Tra i metodi di estrazione dei metalli dalle suddette polveri si richiamano: Among the methods of extracting metals from the aforementioned powders, the following are mentioned:
- forno Waelz (processo HTR U.S.A. e Berzelius GERMANIA), processi al plasma (Tetronics INGHILTERRA, Tibur Howden CANADA) e processo Flame Reactor Process (F.R.P. Horsehead Reeource Developement U.S.A.) che producono materiali arricchiti in _ zinco, piombo e cadmio. - Waelz furnace (HTR U.S.A. and Berzelius GERMANY process), plasma processes (Tetronics INGHILTERRA, Tibur Howden CANADA) and Flame Reactor Process (F.R.P. Horsehead Reeource Development U.S.A.) which produce materials enriched in _ zinc, lead and cadmium.
- processo al plasma (Scan Dust SVEZIA) che produce zinco metallo grado Prime Weste_rn - plasma process (Scan Dust SWEDEN) which produces Prime Weste_rn metal zinc
- lisciviazione earboammoniacale (U.S, Patent N° 4.071.357) nel quale il piombo resta nel residuo come carbonato - earboammoniacal leaching (U.S, Patent N ° 4.071.357) in which the lead remains in the residue as carbonate
- lisciviazione in ambiente alcalino forte (soda caustica) che prevede l'estrazione elettrolitica di zinco in bagno alcalino sotto forma di polvere (U.S. Patent N° 3,743,501 e processo. Promozinc FRANCIA) - leaching in a strong alkaline environment (caustic soda) which involves the electrolytic extraction of zinc in an alkaline bath in the form of a powder (U.S. Patent No. 3,743,501 and process. Promozinc FRANCE)
- lisciviazione con cloro ed elettrolisi del cloruro di zJ.nco in sali fusi (processo a bassa temperatura di B.K. Thomas e D.G. Fray INGHILTERRA) - chlorine leaching and electrolysis of zJ.nco chloride in molten salts (low temperature process by B.K. Thomas and D.G. Fray ENGLAND)
- lisciviazione con acido solforico in doppio stadio in autoclave (U.S. Patent N° 4.610.721) nella quale il piombo resta nel residuo come solfato. - two-stage leaching with sulfuric acid in an autoclave (U.S. Patent No. 4,610,721) in which the lead remains in the residue as sulphate.
Tra i metodi sopraccitati alcuni realizzano solo un arricchimento dei metalli, alcuni realizzano una produzione di metalli sotto forme scarsamente commerciabili ed alcuni realizzano solo l'estrazione dello zinco con consumo di reagenti per il piombo ed il calcio che restano nel residuo. _ Among the aforementioned methods, some carry out only an enrichment of the metals, some carry out a production of metals in poorly marketable forms and some carry out only the extraction of zinc with consumption of reagents for the lead and calcium that remain in the residue. _
Brevemente descritta la presente Invenzione consiste in: Briefly described, the present invention consists of:
1) trattamento delle suddette polveri con una soluzione di car^ bonato di ammonio in modo da trasformare alcuni composti di piombo e zinco in carbonati. In particolare^ i solfati vengono trasformati in carbonati insolubili e viene cosi solubilizzato lo ione solfato. Il solido viene separato dalla soluzione che, addizionata di carbonato di ammonio o di ammoniaca e_anidride carbonica, sarà riutilizzata per il trattamento sopra descritto fino a che sarà spurgata nella fase 7) 1) treatment of the aforesaid powders with a solution of ammonium carbonate so as to transform some compounds of lead and zinc into carbonates. In particular, the sulphates are transformed into insoluble carbonates and the sulphate ion is thus solubilized. The solid is separated from the solution which, with the addition of ammonium carbonate or ammonia and carbon dioxide, will be reused for the treatment described above until it is purged in step 7)
2) il solido ottenuto nella fase 1) viene miscelato con cloruro di ammonio solido e il tutto viene portato e mantenuto ad una temperatura da 120 a 450°C fino, a _quando_non si. ha più fuoriuscita di ammoniaca. In queste condizioni operative avvengono reazioni del tipo: 2) the solid obtained in step 1) is mixed with solid ammonium chloride and the whole is brought and maintained at a temperature from 120 to 450 ° C until, when it is not. has more ammonia leaking. Under these operating conditions, reactions such as:
MeO 2HH CI = MeCl H 0 2ilH MeO 2HH CI = MeCl H 0 2ilH
4 2 2 3 - - 4 2 2 3 - -
MeCO 2NH CI s MeCl H 0 2NH CO MeCO 2NH CI s MeCl H 0 2NH CO
3 - 4 2 2 3 - 2 <~ ~ >MeSiO 2NH CI = MeCl H 0 2NH SiO 3 - 4 2 2 3 - 2 <~ ~> MeSiO 2NH CI = MeCl H 0 2NH SiO
3 4 2 2 3 2 MeOFe 0 2NH CI = MeCl H 0 2NH Fe 0 3 4 2 2 3 2 MeOFe 0 2NH CI = MeCl H 0 2NH Fe 0
23 4 2 2 3 23 dove per Me si intendono metalli come Ph, Zn, Cd, Ca, Cu ecc. L'ammoniaca e^ 1'anidride carbonica che si sviluppano dalle reazioni vengono recuperate e riutilizzate nel processo. 23 4 2 2 3 23 where by Me we mean metals such as Ph, Zn, Cd, Ca, Cu etc. The ammonia and carbon dioxide which develop from the reactions are recovered and reused in the process.
3) il solido ottenuto in 2) viene lisciviato con una soluzione ad alta concentrazione di ioni cloruri (fino a 16,5 Moli/litro) ad una temperatura da 70 a 110°C per un tempo da 0,5 a 5 ore; si ha così la solufailizzazione dei cloruri ed in particolare di quello di piombo che va a formare ioni complessi del tipo 1- 2-(PbCl^) e (PbCl^) . La soluzione viene separata dal residuo che, essendo stato scaricato dai metalli pesanti, può essere utilizzato come ossido ferrico per leghe ferrose (acciai ecc.), 4) la soluzione ottenuta in 3) viene raffreddata e si ha la cristallizzazione di cloruro di piombo che viene separato. 3) the solid obtained in 2) is leached with a solution with a high concentration of chloride ions (up to 16.5 moles / liter) at a temperature from 70 to 110 ° C for a time from 0.5 to 5 hours; there is thus the solufailization of the chlorides and in particular of that of lead which forms complex ions of the type 1- 2- (PbCl ^) and (PbCl ^). The solution is separated from the residue which, having been discharged from heavy metals, can be used as ferric oxide for ferrous alloys (steels, etc.), 4) the solution obtained in 3) is cooled and lead chloride crystallizes which is separated.
5) la soluzione, ottenuta in 4) viene neutralizzata, ad esempio con ammoniaca ad un pH da 2 a 4,5 per precipitare eventuale ferro diecAolto nella fase 3); il solido ottenuto è idrato ferrico e.verrà separato dalla soluzione per essere utilizzato come materia,prima per leghe ferrose 5) the solution obtained in 4) is neutralized, for example with ammonia at a pH from 2 to 4.5 to precipitate any iron diecAolith in step 3); the solid obtained is ferric hydrate and will be separated from the solution to be used as raw material for ferrous alloys
6) la soluzione ottenuta in 5) viene trattata con polvere di zinco che fa precipitare il cadmio e i metalli più nobili dello zinco sotto forma di cementi che vengono separati dal liquido. 6) the solution obtained in 5) is treated with zinc powder which precipitates cadmium and the noblest metals of zinc in the form of cements which are separated from the liquid.
7) la soluzione ottenuta in 6) viene mescolata con la soluzione spurgata nella fase 1) e successivamente addizionata di ammoniaca mantenendo un pH da 8 a 14; si ha così la precipitazione del calcio come solfato e fluoruro; (questa operazione può essere realizzata in due stadi separati in modo da ottenere i due sali di calcio non mescolati tra loro). I sali di calcio vengono separati dalla soluzione. 7) the solution obtained in 6) is mixed with the solution purged in step 1) and subsequently added with ammonia maintaining a pH from 8 to 14; in this way calcium precipitates as sulphate and fluoride; (this operation can be carried out in two separate stages in order to obtain the two calcium salts not mixed together). The calcium salts are separated from the solution.
8) la soluzione ottenuta in 7) viene addizionata di anidride carbonica o di carbonato di ammonio e riscaldata all'ebollizione per scacciane l'ammoniaca (strippaggio); si ha così la precipitazione di carbonato di zinco che viene separato dalla soluzione. 8) the solution obtained in 7) is added with carbon dioxide or ammonium carbonate and heated to boiling to remove the ammonia (stripping); thus there is the precipitation of zinc carbonate which is separated from the solution.
9) il carbonato di zj.nco ottenuto in 8) può essere.calcinato per ottenere ossido oppure lisciviato in acidi (ad esempio acldo solforico) per l'estrazione elettrolitica .dal-metallo.; in entrambi i casi si otterrà anidride carbonica da riutilizzare nel processo. 9) the zinc carbonate obtained in 8) can be calcined to obtain oxide or leached in acids (for example sulfuric acid) for electrolytic extraction from the metal. in both cases carbon dioxide will be obtained to be reused in the process.
10) il cloruro di piombo ottenuto in 4) viene trattato con soluzione di ammoniaca e anidride carbonica che lo trasformano per reazione di doppio sicambio in carbonato di piombo; il carbonato di piombo viene separato dalla soluzione di cloruro di ammonio. 10) the lead chloride obtained in 4) is treated with a solution of ammonia and carbon dioxide which transform it by a double exchange reaction into lead carbonate; the lead carbonate is separated from the ammonium chloride solution.
11) il carbonato di piombo ottenuto in 10) può essere calcinato per ottenere ossido oppure essere lisciviato in acidi (ad esempio acido fluoborico) per l'estrazione elettrolitica.del metallo; in entrambi i casi si otterrà anidride carbonica da riutilizzare nel processo. 11) the lead carbonate obtained in 10) can be calcined to obtain oxide or be leached into acids (for example fluoboric acid) for the electrolytic extraction of the metal; in both cases carbon dioxide will be obtained to be reused in the process.
12) le soluzioni ottenute in 8) e 10) vengono sottoposte ad evaporazione e raffreddamento per cristallizzare cloruro di ammonio da utilizzare nella fase 2); le acque madri della.cristaliizzazione, data l'alta concentrazione di ioni cloruri, verranno utilizzate nella fase di lisciviazione descritta in 3). Il procedimento qui descritto, cne mostra una delle possibili applicazioni praticho dell'invenzione in oggetto. è rappresene, tato graficamente nello schema di flusso allegato, 12) the solutions obtained in 8) and 10) are subjected to evaporation and cooling to crystallize ammonium chloride to be used in phase 2); the mother liquors of the crystallization, given the high concentration of chloride ions, will be used in the leaching step described in 3). The process described herein shows one of the possible practical applications of the present invention. is represented graphically in the attached flow chart,
Il procedimento secondo la seguente invenzione verrà.ora jpe- _ glio compreso con riferimento all'esempio qui di seguito riportato e dato a semplice titolo illustrativo delle fasi più significative. The process according to the following invention will now be better understood with reference to the example reported below and given merely by way of illustration of the most significant steps.
ESSirPIO - 500 grammi di polvere da abbattimento fumi da forni elettrici aventi la composizione: ESSirPIO - 500 grams of dust from smoke abatement from electric ovens having the composition:
Ferro 35 r,ó Iron 35 r, ó
Zinco 18,G Γί Zinc 18, G Γί
Piombo 4,3 3⁄4 Lead 4.3 3⁄4
Calcio 2 % Calcium 2%
Cadmio 0,07 % Cadmium 0.07%
Solfati 2,8 Sulphates 2.8
Fluoruri 0,4 % Fluorides 0.4%
sono stati trattati per 4 ore con 3 litri di soluzione di car-_ bonato di ammonio (80 g/1) ad una temperatura di 45-50°C.,_ _ La soluzione ottenuta dr questa lisciviazione ha una composi- _ zione: were treated for 4 hours with 3 liters of ammonium carbonate solution (80 g / l) at a temperature of 45-50 ° C. The solution obtained by this leaching has a composition:
Solfati 4,44 g/1 Sulphates 4.44 g / 1
Fluoruri 0,21 g/1 Fluorides 0.21 g / 1
Piombo 0,015 g/1 Lead 0.015 g / 1
Calcio meno di 0,001 g/1 Calcium less than 0.001 g / 1
Zinco 9,5 o/l Zinc 9.5 o / l
Il residuo solido della lisciviazione è stato miscelato con 450 grammi di cloruro di ammonio ed il tutto è stato portato e mantenuto ad una temperatura di 260-280°C per 4 ore. The solid residue of the leaching was mixed with 450 grams of ammonium chloride and the whole was brought and maintained at a temperature of 260-280 ° C for 4 hours.
Il solido arrostito è stato poi lisciviato con 1 litro di soluzione di cloruro sodio (250 g/1) per 2 ore a 90°C. The roasted solid was then leached with 1 liter of sodium chloride solution (250 g / 1) for 2 hours at 90 ° C.
Il residuo di questa lisciviazione, lavato con acqua bollente, ha un peso secco di 280 grammi ed ha una composizione: The residue of this leaching, washed with boiling water, has a dry weight of 280 grams and has a composition:
Ferro 58,5 3⁄4 Iron 58.5 3⁄4
Zinco 6,6 % Zinc 6.6%
Piombo 0,25 % Lead 0.25%
Calcio 0,4 % Calcium 0.4%
Cadmio 0,005 % Cadmium 0.005%
Nella soluzione ottenuta da questa lisciviazione si riscontra una acidità libera corrispondente a pH 1 ed una quantità di ferro disciolto che rappresenta il 7 % del ferro contenuto nel solido iniziale. In the solution obtained from this leaching there is a free acidity corresponding to pH 1 and a quantity of dissolved iron which represents 7% of the iron contained in the initial solid.
Da questa soluzione per raffreddamento si ottengono cristalli di cloruro di piombo che vengono separati. From this solution by cooling lead chloride crystals are obtained which are separated.
Si aggiunge poi ammoniaca fino ad un pH di 3,5 e si ha precipi-tazione di idrato ferrico; nella soluzione finale si ha un tenore di ferro inferiore a 0,010 g/1. Ammonia is then added up to a pH of 3.5 and ferric hydrate precipitates; in the final solution there is an iron content lower than 0.010 g / 1.
In seguito la soluzione, depurata da calcio e dai metalli più nobili dello zinco, per strippaggio dell'ammoniaca ha dato un carbonato di zinco con la seguente composizione: Subsequently, the solution, purified from calcium and from the noblest metals of zinc, by stripping the ammonia gave a zinc carbonate with the following composition:
Zn f>0 C1. 0,036 F 0,023 Pb 0,001 Cd 0,005 Ili 0,002 Cu 0,001 Fe 0,013 Zn f> 0 C1. 0.036 F 0.023 Pb 0.001 Cd 0.005 Ili 0.002 Cu 0.001 Fe 0.013
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT5127A IT1238670B (en) | 1990-03-02 | 1990-03-02 | Extraction procedures for zinc, iron and cadmium from smoke abatement dusts from electric ovens. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT5127A IT1238670B (en) | 1990-03-02 | 1990-03-02 | Extraction procedures for zinc, iron and cadmium from smoke abatement dusts from electric ovens. |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| IT9005127A0 IT9005127A0 (en) | 1990-03-02 |
| IT9005127A1 true IT9005127A1 (en) | 1991-09-03 |
| IT1238670B IT1238670B (en) | 1993-09-01 |
Family
ID=11118023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT5127A IT1238670B (en) | 1990-03-02 | 1990-03-02 | Extraction procedures for zinc, iron and cadmium from smoke abatement dusts from electric ovens. |
Country Status (1)
| Country | Link |
|---|---|
| IT (1) | IT1238670B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116970817B (en) * | 2023-09-20 | 2023-12-29 | 矿冶科技集团有限公司 | Method for recovering potassium and sodium from rotary hearth furnace smoke dust |
-
1990
- 1990-03-02 IT IT5127A patent/IT1238670B/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| IT1238670B (en) | 1993-09-01 |
| IT9005127A0 (en) | 1990-03-02 |
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