EP0109468A1 - Process for the selective recovery of lead from lead sulphides - Google Patents
Process for the selective recovery of lead from lead sulphides Download PDFInfo
- Publication number
- EP0109468A1 EP0109468A1 EP82402105A EP82402105A EP0109468A1 EP 0109468 A1 EP0109468 A1 EP 0109468A1 EP 82402105 A EP82402105 A EP 82402105A EP 82402105 A EP82402105 A EP 82402105A EP 0109468 A1 EP0109468 A1 EP 0109468A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lead
- solution
- metal
- electrolysis
- sulphides
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
- C25C1/18—Electrolytic production, recovery or refining of metals by electrolysis of solutions of lead
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B13/00—Obtaining lead
- C22B13/04—Obtaining lead by wet processes
Definitions
- the present invention relates to the extraction of lead from metallic sulfides such as common lead sulfides and ores and ore concentrates containing lead sulfide. It relates to a process which allows more particularly the selective extraction of lead (Pb) in the presence of other metals such as silver, copper or iron which may be in the state of sulfides with lead sulfide in this kind of minerals.
- hydrometallurgical processes have been developed for oxidizing various sulphides in an aqueous medium, in hydrochloric solutions. These processes apply to most metals; They use a combination of different chlorinated leaching reagents, such as' chlorine, hydrochloric acid, ferrous / ferric chloride, cupric chloride, manganic chloride, sodium chloride, calcium chloride.
- chlorinated leaching reagents such as' chlorine, hydrochloric acid, ferrous / ferric chloride, cupric chloride, manganic chloride, sodium chloride, calcium chloride.
- the reaction carried out consists of an oxidative dissolution and it leads to a chlorinated salt solution from which the metal is then recovered.
- the present invention overcomes the drawbacks of known techniques thanks to a process for treating metal sulfides, which uses the hydrometallurgical route and which, however, is effective in ensuring the extraction of lead, selectively in the presence of the other metals which are usually found in lead sulphide ores.
- the method according to the invention essentially comprises at least a first chemical etching step in which the metallic sulfide is subjected to oxidation in an aqueous solution of fluosilicic acid.
- it also comprises a second recovery stage in which the solution in a fluosilicon medium obtained is subjected to an electrolysis leading to the formation of lead metal at the cathode and of oxygen at the cathode.
- the first step it is also advantageous to use a redox oxidation couple with potential of between 0.7 and 1.4 volts relative to the normal hydrogen electrode. This is the case in particular of the couple 0 2 / H2 0 2 which appeared particularly favorable in the implementation of the invention.
- the method according to the invention already makes it possible to obtain good solubility of the starting sulphide, at the same time as the oxidative attack of lead preferentially over the other metals generally found associated with lead in metal sulphides. This effective and selective attack of lead has been proven by the experiments carried out by the applicants, whereas previous knowledge in no way foreshadowed it.
- the fluosilicic solution containing lead oxidized state 'of dissolved salts which are easily separated sulfur supernatant et.les any insoluble compounds, lead can be produced in the metallic state in different ways.
- the electrolytic route is preferred, in particular in accordance with the second step which has already been defined above.
- the fluosilicon medium preferably in conjunction with the use of the redox couple 0 2 / H 2 0 2 , lends itself remarkably to the combination of oxidative chemical dissolution in an aqueous electrolyte with the recovery of lead metal by electrolysis, because it appeared to be very particularly advantageous to carry out this electrolysis also in a fluosilicon medium, directly on the solution obtained after the first step. While lead metal is thus produced, the same electrolysis operation makes it possible to recover the oxygen and the fluosilicic solution, which can be recycled in the first step for dissolution.
- the recovery of lead metal by electrolysis of the fluosilicic solution of dissolution has moreover the advantage that at the same time, by the same operation, one regenerates oxygen and the acid solution, which one then in general has any interest in recycle at the first step, for dissolution.
- the invention thus allows the transformation of ores and metallic concentrates of lead sulphide at low cost, at atmospheric pressure, without the appearance of by-products and under optimum conditions of yield and selectivity.
- the fluosilicic acid and the oxidant are present in the attack solution in amounts at least equal to the stoichiometric amounts corresponding to the reaction for dissolving lead sulfide, ie a molecule of fluosilicic acid and a molecule d hydrogen peroxide per molecule of lead sulfide to be dissolved.
- lead sulfide ie a molecule of fluosilicic acid and a molecule d hydrogen peroxide per molecule of lead sulfide to be dissolved.
- the sulfur in lead sulfide is therefore transformed into elemental sulfur while the metal is dissolved in the form of Pb ++ ions.
- sulfur floats on the solution; There is no appearance of passivating layers which would considerably slow down the reaction.
- the selectivity of the process results in the fact that for most minerals, the other metals present, such as silver, copper, iron, zinc, or bismuth, are not or only very little dissolved.
- the solid residue from the attack can moreover be treated with a view to the recovery of these metals, in particular by the hydrochloric route.
- the lead metal is thus recovered, which is deposited on the cathode, and, in parallel, the oxygen which is released at the anode.
- the pH conditions linked to the implementation of the attack of the first stage are directly favorable, without there being any need to intervene there between the two operations, and on the other hand, it is easy to adjust the current density so as to best promote the above reactions, to the detriment of the concurrent anode reaction which leads to the formation of lead oxide.
- the oxygen recovered at the anode is generally recycled in the dissolution stage, as is the fluosilicic solution which is regenerated by electrolysis substantially to its original acidity. The only reagent consumed by the whole process is then the oxidant (hydrogen peroxide more often), which is used in excess for the dissolution of lead sulfide.
- the attack solution is an aqueous solution of fluosilicic acid having the following composition:
- the kinetics of dissolution are such that after one hour, a proportion of 40% of the lead sulfide is already dissolved.
- the conditions applied for electrolysis are as follows: The electrical energy consumption is 0.5 kWh per kilogram of lead obtained.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Electrolytic Production Of Metals (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
La présente invention a trait à l'extraction du plomb à partir de sulfures métalliques tels que les sulfures de plomb communs et les minerais et concentrés de minerais contenant du sulfure de plomb. Elle a pour objet un procédé qui permet plus particulièrement l'extraction sélective du plomb (Pb) en présence d'autres métaux comme l'argent, le cuivre ou le fer pouvant se trouver à l'état de sulfures avec le sulfure de plomb dans ce genre de minerais.The present invention relates to the extraction of lead from metallic sulfides such as common lead sulfides and ores and ore concentrates containing lead sulfide. It relates to a process which allows more particularly the selective extraction of lead (Pb) in the presence of other metals such as silver, copper or iron which may be in the state of sulfides with lead sulfide in this kind of minerals.
Le traitement pyrométallurgique des sulfures de plomb est cher, polluant et il nécessite souvent l'élimination d'un sous-produit, le dioxyde de soufre.Pyrometallurgical treatment of lead sulphides is expensive, polluting and often requires the elimination of a by-product, sulfur dioxide.
Pour remédier aux inconvénients du procédé pyrométallurgique, et plus particulièrement à la pollution, des procédés dits hydrométallurgiques ont été mis au point pour oxyder divers sulfures en milieu aqueux, au sein de solutions chlorhydriques. Ces procédés s'appliquent à la plupart des métaux ; Ils utilisent une combinaison de différents réactifs chlorés de lessivage, tels que 'le chlore, l'acide chlorydrique, le chlorure ferreux/ferrique, le chlorure cuivrique, le chlorure manganique, le chlorure de sodium, le chlorure de calcium. La réaction -mise en oeuvre consiste en une dissolution oxydante et elle conduit à une solution de sel chloré d'où l'on récupère ensuite le métal.To remedy the drawbacks of the pyrometallurgical process, and more particularly to pollution, so-called hydrometallurgical processes have been developed for oxidizing various sulphides in an aqueous medium, in hydrochloric solutions. These processes apply to most metals; They use a combination of different chlorinated leaching reagents, such as' chlorine, hydrochloric acid, ferrous / ferric chloride, cupric chloride, manganic chloride, sodium chloride, calcium chloride. The reaction carried out consists of an oxidative dissolution and it leads to a chlorinated salt solution from which the metal is then recovered.
Néanmoins, ces procédés hydrométallurgiques connus ne conviennent pas à l'extraction du plomb à partir des sulfures métalliques contenant du plomb, notamment à partir des minerais sulfurés de plomb. Les difficultés rencontrées sont liées principalement à un problème de solubilité du plomb dans le milieu, ainsi qu'à la récupération du métal à partir de la forme chlorure. On doit en général déplorer par ailleurs une grande consommation d'énergie, la réduction du PbCl2 se faisant, soit sous forme pyrométallurgique, soit par électrolyse avec un voltage élevé.However, these known hydrometallurgical processes are not suitable for extracting lead from metallic sulphides containing lead, especially from lead sulphide ores. The difficulties encountered are mainly linked to a problem of solubility of lead in the medium, as well as to the recovery of the metal from the chloride form. In general, we must deplore a large energy consumption, the reduction of PbCl 2 being done either in pyrometallurgical form, or by electrolysis with a high voltage.
En fait, on ne connaît aucun procédé hydrométallurgique qui soit applicable industriellement au traitement des minerais sulfurés ou autres sulfures métalliques en vue de l'extraction du plomb.In fact, no hydrometallurgical process is known which can be applied industrially to the treatment of sulphide ores or other metal sulphides with a view to extracting lead.
La présente invention permet de pallier aux inconvénients des techniques connues grâce à un procédé de traitement de sulfures métalliques, qui utilise la voie hydrométallurgique et qui cependant est efficace pour assurer l'extraction du plomb, sélectivement en présence des autres métaux qui se trouvent habituellement dans les minerais sulfurés de plomb.The present invention overcomes the drawbacks of known techniques thanks to a process for treating metal sulfides, which uses the hydrometallurgical route and which, however, is effective in ensuring the extraction of lead, selectively in the presence of the other metals which are usually found in lead sulphide ores.
Le procédé selon l'invention comprend essentiellement au moins une première étape d'attaque chimique dans laquelle le sulfure métalliqùe est soumis à oxydation dans une solution aqueuse d'acide fluosilicique. De préférence, il comporte en outre une seconde étape de récupération dans laquelle on soumet la solution en milieu fluosilicique obtenue à une électrolyse conduisant à la formation de plomb métal à la cathode et d'oxygène à la cathode.The method according to the invention essentially comprises at least a first chemical etching step in which the metallic sulfide is subjected to oxidation in an aqueous solution of fluosilicic acid. Preferably, it also comprises a second recovery stage in which the solution in a fluosilicon medium obtained is subjected to an electrolysis leading to the formation of lead metal at the cathode and of oxygen at the cathode.
Dans la première étape, il est par ailleurs avantageux d'utiliser un couple d'oxydation' rédox à potentiel compris entre 0,7 et 1,4 volts par rapport à l'électrode normale à hydrogène. Ceci est le cas en particulier du couple 02/H202 qui est apparu particulièrement favorable dans la mise en oeuvre de l'invention. A ce stade, le procédé selon l'invention permet déjà d'obtenir une bonne solubilité du sulfure de départ, en même temps que l'attaque oxydante du plomb préférentiellement aux autres métaux se trouvant en général associés au plomb dans les sulfures métalliques. Cette attaque efficace et sélective du plomb a été prouvée par les expériences effectuées par les demandeurs, alors que les connaissances antérieures ne le laissaient nullement présager.In the first step, it is also advantageous to use a redox oxidation couple with potential of between 0.7 and 1.4 volts relative to the normal hydrogen electrode. This is the case in particular of the couple 0 2 / H2 0 2 which appeared particularly favorable in the implementation of the invention. At this stage, the method according to the invention already makes it possible to obtain good solubility of the starting sulphide, at the same time as the oxidative attack of lead preferentially over the other metals generally found associated with lead in metal sulphides. This effective and selective attack of lead has been proven by the experiments carried out by the applicants, whereas previous knowledge in no way foreshadowed it.
On notera que par le procédé de l'invention, appliqué au plomb, on évite bien des inconvénients - que présentent les procédés hydrométallurgiques classiques en milieu chloré même dans leur application à d'autres' métaux : rendements d'attaque variables et mal maîtrisés, défaut de sélectivité (notamment dans l'attaque par le chlorure ferrique), solution cristallisant trop facilement, difficultés de contrôle du potentiel rédox, formation de sulfates qui se déposent sur les particules de sulfures et freinent la réaction.Note that the method of the invention, applied to lead, avoids many drawbacks - posed by conventional hydrometallurgical processes at the same chlorinated conditions in their application to other 'metals: Variable Attack returns and poorly controlled, lack of selectivity (especially in attack with ferric chloride), solution which crystallizes too easily, difficulties in controlling the redox potential, formation of sulphates which deposit on the sulphide particles and slow down the reaction.
Une fois obtenue la solution fluosilicique contenant le plomb oxydé à l'état 'de sels dissous, dont on sépare aisément le soufre qui surnage et.les composés insolubles éventuels, le plomb peut être produit à l'état métallique de différentes manières. On peut faire appel à tous schémas de traitement en eux-mêmes connus, comme la cémentation ou l'extraction par solvant. Cependant, on préfère la voie électrolytique, conformément en particulier à la seconde étape que l'on a déjà définie ci-dessus. Le milieu fluosilicique, de préférence en conjonction avec l'emploi du couple rédox 02/H202, se prête d'une manière remarquable à la combinaison de la dissolution chimique oxydante dans un électrolyte aqueux avec la récupération du plomb métal par électrolyse, car il est apparu tout spécialement avantageux d'effectuer cette électrolyse également en milieu fluosilicique, directement sur la solution obtenue après la première étape. Pendant que l'on produit ainsi le plomb métal, la même opération d'électrolyse permet de récupérer l'oxygène et la solution fluosilicique, qui peuvent être recyclés à la première étape pour la dissolution. On évite là d'autres inconvénients que présenteraient les milieux chlorhydriques si l'on cherchait à soumettre une solution de dissolution de sulfures classique à l'électrolyse : incertitude sur une réaction anodique qui est alors du type Fe++/Fe+++ ou Cl-/Cl2, présence de fer en solution, avec comme conséquence un rendement cathodique faible, à moins d'aller jusqu'à la production de fer électrolytique.Once obtained the fluosilicic solution containing lead oxidized state 'of dissolved salts, which are easily separated sulfur supernatant et.les any insoluble compounds, lead can be produced in the metallic state in different ways. We can use any treatment scheme known per se, such as case hardening or solvent extraction. However, the electrolytic route is preferred, in particular in accordance with the second step which has already been defined above. The fluosilicon medium, preferably in conjunction with the use of the redox couple 0 2 / H 2 0 2 , lends itself remarkably to the combination of oxidative chemical dissolution in an aqueous electrolyte with the recovery of lead metal by electrolysis, because it appeared to be very particularly advantageous to carry out this electrolysis also in a fluosilicon medium, directly on the solution obtained after the first step. While lead metal is thus produced, the same electrolysis operation makes it possible to recover the oxygen and the fluosilicic solution, which can be recycled in the first step for dissolution. This avoids other drawbacks that hydrochloric media would present if one sought to subject a conventional sulphide dissolution solution to electrolysis: uncertainty on an anodic reaction which is then of the type Fe ++ / Fe +++ or Cl- / Cl 2 , presence of iron in solution, with as a consequence a low cathodic yield, unless going to the production of electrolytic iron.
La récupération du plomb métal par électrolyse de la solution fluosilicique de dissolution a en outre comme avantage que dans le même temps, par la même opération, on régénère l'oxygène et la solution acide, que l'on a alors en général tout intérêt à recycler à la première étape, pour la dissolution. Globalement, l'invention permet ainsi la transformation des minerais et concentrés métalliques de sulfure de plomb à faible coût, à la pression atmosphérique, sans apparition de sous-produits et dans des conditions optimales de rendement et de sélectivité.The recovery of lead metal by electrolysis of the fluosilicic solution of dissolution has moreover the advantage that at the same time, by the same operation, one regenerates oxygen and the acid solution, which one then in general has any interest in recycle at the first step, for dissolution. Overall, the invention thus allows the transformation of ores and metallic concentrates of lead sulphide at low cost, at atmospheric pressure, without the appearance of by-products and under optimum conditions of yield and selectivity.
On décrira maintenant plus en détails le procédé selon l'invention, dans des conditions de mise en oeuvre pratiques, qui ne sont cependant pas limitatives. En général, on part d'un minerai ou concentré à base de sulfure de plomb, préalablement broyé, à une granulométrie qui peut être notamment de l'ordre de 50 à 500 microns et on le met en suspension dans une solution d'acide fluosilicique, de pH avantageusement inférieur à 2 ou au plus égal à 2, contenant un oxydant. Cet oxydant peut être de l'eau oxygénée et/ou de l'oxygène. On peut en particulier utiliser au départ une solution d'acide fluosilicique contenant en outre de l'eau oxygénée et mélanger ensuite la bouillie formée avec le sulfure intimement avec un gaz porteur d'oxygène, en y faisant barboter ce gaz, qui peut être de l'oxygène pur ou de l'air, éventuellement enrichi en oxygène. On maintient le mélange sensiblement à la pression atmosphérique, et à une température inférieure ou au plus égale à la température d'ébullition de l'électrolyte, et généralement supérieure à 50°C environ.The method according to the invention will now be described in more detail, under practical conditions of implementation, which however are not limiting. In general, one starts with an ore or concentrate based on lead sulphide, previously ground, to a particle size which can in particular be of the order of 50 to 500 microns and is suspended in an acid solution. fluosilicon, with a pH advantageously less than 2 or at most equal to 2, containing an oxidant. This oxidant can be hydrogen peroxide and / or oxygen. One can in particular initially use a solution of fluosilicic acid containing moreover hydrogen peroxide and then mix the slurry formed with the sulphide intimately with an oxygen-carrying gas, by bubbling this gas there, which can be pure oxygen or air, possibly enriched with oxygen. The mixture is maintained substantially at atmospheric pressure, and at a temperature lower than or at most equal to the boiling point of the electrolyte, and generally higher than about 50 ° C.
De préférence, l'acide fluosilicique et l'oxydant sont présents dans la solution d'attaque en des quantités au moins égales aux quantités stoechiométriques correspondant à la réaction de dissolution du sulfure de plomb, soit une molécule d'acide fluosilicique et une molécule d'eau oxygénée par molécule de sulfure de plomb à dissoudre. Ces quantités théoriques correspondent à la réaction :
La consommation réelle d'eau oxygénée varie de une à deux fois la proportion stoechiométrique, tandis que pour l'acide la consommation réelle reste proche de la quantité stoechiométrique.The actual consumption of hydrogen peroxide varies from one to two times the stoichiometric proportion, while for acid the actual consumption remains close to the stoichiometric amount.
Conformément à cette réaction, le soufre du sulfure de plomb est donc transformé en soufre élémentaire tandis que le métal est mis en solution sous forme d'ions Pb++. En pratique, le soufre surnage sur la solution ; On ne constate pas d'apparition de couches passivantes qui ralentiraient considérablement la réaction. Par ailleurs, la sélectivité du procédé se traduit par le fait que pour la plupart des minerais, les autres métaux présents, tels que l'argent, le cuivre, le fer, le zinc, ou le bismuth, ne sont pas ou que très peu dissous. Le résidu solide de l'attaque peut d'ailleurs être traité en vue de la récupération de ces métaux, notamment par la voie chlorhydrique.In accordance with this reaction, the sulfur in lead sulfide is therefore transformed into elemental sulfur while the metal is dissolved in the form of Pb ++ ions. In practice, sulfur floats on the solution; There is no appearance of passivating layers which would considerably slow down the reaction. Furthermore, the selectivity of the process results in the fact that for most minerals, the other metals present, such as silver, copper, iron, zinc, or bismuth, are not or only very little dissolved. The solid residue from the attack can moreover be treated with a view to the recovery of these metals, in particular by the hydrochloric route.
La solution fluosilicique contenant les ions de plomb Pb++ est ensuite transférée dans une cellule d'électrolyse, qui peut être notamment une cellule de type courant comportant un diaphragme de séparation entre les compartiments cathodique et anodique et une anode insoluble. L'électrolyse provoque les réactions suivantes :
- - à la cathode :
- - à l'anode :
- - at the cathode:
- - at the anode:
On récupère ainsi le plomb métal, qui se dépose sur la cathode, et, parallèlement l'oxygène qui se dégage à l'anode. Les conditions de pH liées à la mise en oeuvre de l'attaque de la première étape sont directement favorables, sans qu'il y ait lieu d'intervenir dessus entre les deux opérations, et d'autre part, il est facile de régler la densité de courant de manière à favoriser au mieux les réactions ci-dessus, au préjudice de la réaction anodique concurrente qui conduit à la formation d'oxyde de plomb. L'oxygène récupéré à l'anode est en général recyclé à l'étape de dissolution, de même que la solution fluosilicique qui est régénérée par l'électrolyse sensiblement à son acidité d'origine. Le seul réactif consommé par le procédé dans son ensemble est alors l'oxydant (eau oxygénée le plus souvent), qui est utilisé en excès pour la dissolution du sulfure de plomb.The lead metal is thus recovered, which is deposited on the cathode, and, in parallel, the oxygen which is released at the anode. The pH conditions linked to the implementation of the attack of the first stage are directly favorable, without there being any need to intervene there between the two operations, and on the other hand, it is easy to adjust the current density so as to best promote the above reactions, to the detriment of the concurrent anode reaction which leads to the formation of lead oxide. The oxygen recovered at the anode is generally recycled in the dissolution stage, as is the fluosilicic solution which is regenerated by electrolysis substantially to its original acidity. The only reagent consumed by the whole process is then the oxidant (hydrogen peroxide more often), which is used in excess for the dissolution of lead sulfide.
Les exemples chiffrés qui suivent illustrent la mise en oeuvre du procédé selon l'invention, à titre purement indicatif et nullement limitatif :The numerical examples which follow illustrate the implementation of the method according to the invention, by way of purely indicative and in no way limitative:
Dans une solution d'attaque, agitée par agitateur magnétique, dans laquelle on fait barboter de l'air, on disperse le minerai de sulfure de plomb finement broyé, à une granulométrie inférieure à 100 microns.In an etching solution, stirred by magnetic stirrer, in which air is bubbled, the finely ground lead sulphide ore is dispersed, with a particle size less than 100 microns.
La solution d'attaque est une solution aqueuse d'acide fluosilicique présentant la composition suivante :
Température de la solution : 70°C.Solution temperature: 70 ° C.
La cinétique de dissolution est telle qu'au bout d'une heure, une proportion de 40 % du sulfure de plomb est déjà dissoute.The kinetics of dissolution are such that after one hour, a proportion of 40% of the lead sulfide is already dissolved.
Après filtrage de la solution contenant le plomb à l'état dissous, on procède à son électrolyse dans une cellule à diaphragme, avec anode de titane platinisé, pour obtenir le plomb à l'état métallique.After filtering the solution containing lead in the dissolved state, its electrolysis is carried out in a diaphragm cell, with platinized titanium anode, to obtain lead in the metallic state.
Les conditions appliquées pour l'électrolyse sont les suivantes :
Il s'agit de l'attaque d'une galène contenant une proportion importante de sulfures autres que le sulfure de plomb. Les conditions de l'opération sont celles indiquées dans l'exemple 1.It is the attack on a galena containing a significant proportion of sulphides other than lead sulphide. The conditions of the operation are those indicated in Example 1.
Pour quantifier le caractère sélectif de la dissolution, on détermine pour chaque élément le coefficient de partage défini de la manière suivante : si A est le rapport de la quantité de l'élément considéré à la quantité de plomb, dans le minerai, et si B est le rapport de la quantité de ce même élément dissous à la quantité de plomb dissous, donc dans la solution, le coefficient de partage est :
K = A/B.To quantify the selective nature of the dissolution, the partition coefficient defined for each element is determined as follows: if A is the ratio of the quantity of the element considered to the quantity of lead in the ore, and if B is the ratio of the quantity of this same dissolved element to the quantity of dissolved lead, so in the solution, the partition coefficient is:
K = A / B.
Dans le tableau ci-après, on a relevé pour chaque élément, sa proportion Q en pourcentage pondéral moyen dans le minerai, les rapports A et B ci-dessus définis et le coefficient de partage K :
Ces chiffres démontrent la haute sélectivité du procédé. La dissolution des métaux autre que le plomb est très faible et celle de l'argent est nulle.These figures demonstrate the high selectivity of the process. The dissolution of metals other than lead is very weak and that of silver is zero.
Claims (10)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19820402105 EP0109468B1 (en) | 1982-11-18 | 1982-11-18 | Process for the selective recovery of lead from lead sulphides |
| DE8282402105T DE3276910D1 (en) | 1982-11-18 | 1982-11-18 | Process for the selective recovery of lead from lead sulphides |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19820402105 EP0109468B1 (en) | 1982-11-18 | 1982-11-18 | Process for the selective recovery of lead from lead sulphides |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0109468A1 true EP0109468A1 (en) | 1984-05-30 |
| EP0109468B1 EP0109468B1 (en) | 1987-08-05 |
Family
ID=8189949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19820402105 Expired EP0109468B1 (en) | 1982-11-18 | 1982-11-18 | Process for the selective recovery of lead from lead sulphides |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0109468B1 (en) |
| DE (1) | DE3276910D1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102828035A (en) * | 2012-09-25 | 2012-12-19 | 四川巨宏科技有限公司 | Method for producing high-purity zinc oxide through decarbonization on electrolytic zinc acid leaching slag by adopting ammonia process |
| CN102828032A (en) * | 2012-09-25 | 2012-12-19 | 四川巨宏科技有限公司 | Method for producing lithopone by utilizing electrolytic zinc acid leaching slag |
| CN102863013A (en) * | 2012-09-25 | 2013-01-09 | 四川巨宏科技有限公司 | Method for producing lithopone by matching low-grade zinc oxide ores with gypsum |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR320097A (en) * | 1902-04-01 | 1902-12-01 | Betts | Improvements in and relating to the electrolytic refining of lead and lead alloys |
| FR1474663A (en) * | 1966-04-06 | 1967-03-24 | Electrolyt Zinc Australasia | Metal extraction process |
| US3960681A (en) * | 1974-02-21 | 1976-06-01 | Mitsui Mining & Smelting Co., Ltd. | Method for producing electrolytic high purity lead using large-sized electrodes |
| US3972790A (en) * | 1975-09-26 | 1976-08-03 | Uop Inc. | Production of metallic lead |
| US4026776A (en) * | 1970-12-02 | 1977-05-31 | Mitsui Mining & Smelting Co., Ltd. | Method for producing high purity lead |
| FR2446863A1 (en) * | 1979-01-22 | 1980-08-14 | Uop Inc | Lead recovery from sulphidic source - comprises halogenation, brine leaching and purification of leach soln. by redn., then oxidn. |
| US4229271A (en) * | 1979-05-24 | 1980-10-21 | Rsr Corporation | Method of recovering lead values from battery sludge |
| FR2453906A1 (en) * | 1979-04-12 | 1980-11-07 | Uop Inc | Hydrometallurgical extn. of lead from sulphide - by halogenating, brine leaching, crystallising, forming carbonate, dissolving in hydro:fluosilicic acid and electrowinning |
| FR2505876A1 (en) * | 1981-05-12 | 1982-11-19 | Noual Patrick | Selective winning of lead from sulphide ores - by leaching with hot aq. hydro:fluorosilicic acid soln. contg. hydrogen peroxide and air so only lead is dissolved |
-
1982
- 1982-11-18 EP EP19820402105 patent/EP0109468B1/en not_active Expired
- 1982-11-18 DE DE8282402105T patent/DE3276910D1/en not_active Expired
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR320097A (en) * | 1902-04-01 | 1902-12-01 | Betts | Improvements in and relating to the electrolytic refining of lead and lead alloys |
| FR1474663A (en) * | 1966-04-06 | 1967-03-24 | Electrolyt Zinc Australasia | Metal extraction process |
| US4026776A (en) * | 1970-12-02 | 1977-05-31 | Mitsui Mining & Smelting Co., Ltd. | Method for producing high purity lead |
| US3960681A (en) * | 1974-02-21 | 1976-06-01 | Mitsui Mining & Smelting Co., Ltd. | Method for producing electrolytic high purity lead using large-sized electrodes |
| US3972790A (en) * | 1975-09-26 | 1976-08-03 | Uop Inc. | Production of metallic lead |
| FR2446863A1 (en) * | 1979-01-22 | 1980-08-14 | Uop Inc | Lead recovery from sulphidic source - comprises halogenation, brine leaching and purification of leach soln. by redn., then oxidn. |
| FR2453906A1 (en) * | 1979-04-12 | 1980-11-07 | Uop Inc | Hydrometallurgical extn. of lead from sulphide - by halogenating, brine leaching, crystallising, forming carbonate, dissolving in hydro:fluosilicic acid and electrowinning |
| US4229271A (en) * | 1979-05-24 | 1980-10-21 | Rsr Corporation | Method of recovering lead values from battery sludge |
| FR2505876A1 (en) * | 1981-05-12 | 1982-11-19 | Noual Patrick | Selective winning of lead from sulphide ores - by leaching with hot aq. hydro:fluorosilicic acid soln. contg. hydrogen peroxide and air so only lead is dissolved |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102828035A (en) * | 2012-09-25 | 2012-12-19 | 四川巨宏科技有限公司 | Method for producing high-purity zinc oxide through decarbonization on electrolytic zinc acid leaching slag by adopting ammonia process |
| CN102828032A (en) * | 2012-09-25 | 2012-12-19 | 四川巨宏科技有限公司 | Method for producing lithopone by utilizing electrolytic zinc acid leaching slag |
| CN102863013A (en) * | 2012-09-25 | 2013-01-09 | 四川巨宏科技有限公司 | Method for producing lithopone by matching low-grade zinc oxide ores with gypsum |
| CN102828035B (en) * | 2012-09-25 | 2014-06-18 | 四川锌鸿科技有限公司 | Method for producing high-purity zinc oxide through decarbonization on electrolytic zinc acid leaching slag by adopting ammonia process |
| CN102863013B (en) * | 2012-09-25 | 2014-06-18 | 四川锌鸿科技有限公司 | Method for producing lithopone by matching low-grade zinc oxide ores with gypsum |
| CN102828032B (en) * | 2012-09-25 | 2015-03-11 | 四川锌鸿科技有限公司 | Method for producing lithopone by utilizing electrolytic zinc acid leaching slag |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0109468B1 (en) | 1987-08-05 |
| DE3276910D1 (en) | 1987-09-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9322104B2 (en) | Recovering lead from a mixed oxidized material | |
| AU669906B2 (en) | Production of metals from minerals | |
| CA2636122C (en) | Process of leaching gold | |
| US9322105B2 (en) | Recovering lead from a lead material including lead sulfide | |
| US20040144208A1 (en) | Process for refining raw copper material containing copper sulfide mineral | |
| FR2907795A1 (en) | Recovering cobalt from a raffinate from the solvent extraction of nickel includes adding a sulfide to precipitate cobalt and zinc sulfides | |
| US3961028A (en) | Method of producing cuprous sulfate and bisulfate solutions | |
| CH679158A5 (en) | ||
| US4030990A (en) | Process for recovering electrolytic copper of high purity by means of reduction electrolysis | |
| FR2505876A1 (en) | Selective winning of lead from sulphide ores - by leaching with hot aq. hydro:fluorosilicic acid soln. contg. hydrogen peroxide and air so only lead is dissolved | |
| PL111879B1 (en) | Method of recovery of copper from diluted acid solutions | |
| EP0109468B1 (en) | Process for the selective recovery of lead from lead sulphides | |
| WO1984001964A1 (en) | Process for selectively extracting lead from lead sulphides | |
| US5939042A (en) | Tellurium extraction from copper electrorefining slimes | |
| CA1211290A (en) | Selective extraction of leau from its sulphides | |
| EP1042518B1 (en) | Oxidising elutriation of contaminated sludge containing iron with separation of zinc and lead | |
| US5156721A (en) | Process for extraction and concentration of rhodium | |
| EP0102299B1 (en) | Process for the selective dissolution of lead | |
| JPS62500388A (en) | Production of zinc from ores and concentrates | |
| FR2589885A1 (en) | PROCESS FOR SEPARATING AND RECOVERING METALS FROM MIXTURES OF METAL SULFIDES, SUCH AS LEAD ORES | |
| FR2463201A1 (en) | Electrolytic winning of cobalt from moist cobalt hydroxide filter cake - by treating with spent electrolyte and reducing agent to obtain soln. from which other metals are sepd. before electrolysis | |
| BE1001781A6 (en) | Treatment method for materials containing heavy metals by acid leaching | |
| MX2008003602A (en) | Process for the lixiviation and recovery of silver and gold with copper ammonia thiosulfate solutions. | |
| AU654774B2 (en) | Electrochemical system for recovery of metals from their compounds | |
| SE446463B (en) | MAKE SURE TO BE LEAD FROM PAINTS AND CONCENTRATE |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Designated state(s): BE DE GB IT SE |
|
| 17P | Request for examination filed |
Effective date: 19840813 |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): BE DE GB IT SE |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19870831 |
|
| REF | Corresponds to: |
Ref document number: 3276910 Country of ref document: DE Date of ref document: 19870910 |
|
| ITF | It: translation for a ep patent filed |
Owner name: DR. ING. A. RACHELI & C. |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed | ||
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19891118 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Effective date: 19891130 |
|
| BERE | Be: lapsed |
Owner name: EXTRAMET Effective date: 19891130 |
|
| GBPC | Gb: european patent ceased through non-payment of renewal fee | ||
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19900801 |