WO1985003526A1 - New process for purifying lead - Google Patents
New process for purifying lead Download PDFInfo
- Publication number
- WO1985003526A1 WO1985003526A1 PCT/FR1985/000017 FR8500017W WO8503526A1 WO 1985003526 A1 WO1985003526 A1 WO 1985003526A1 FR 8500017 W FR8500017 W FR 8500017W WO 8503526 A1 WO8503526 A1 WO 8503526A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lead
- cauldron
- insulator
- fact
- temperature
- 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.)
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Classifications
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- 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
- C22B13/06—Refining
Definitions
- the subject of the present invention is a new process for the purification of an impure lead, often called “lead”. More particularly, it relates to a process for continuously descaling said lead.
- the lead is generally produced in a reduction furnace such as ovens called “water-jackets", rotary ovens or by ISP processes (Imperial Smelting Process) and leaves these ovens at a temperature of 1000 ⁇ C approximately.
- a reduction furnace such as ovens called “water-jackets”, rotary ovens or by ISP processes (Imperial Smelting Process) and leaves these ovens at a temperature of 1000 ⁇ C approximately.
- metals or metalloids are soluble in lead.
- metals metalloids or compounds, mention may be made of CU2S, PbS, Cu, As, Sb, Sn, etc.
- Skimming removes these impurities and produces a purer lead.
- this process has many drawbacks because it can only be carried out discontinuously. It is formed on the surface of large blocks which are difficult to foam and remove. We even obtain pasty products which do not allow any automatic recovery.
- This process allowed continuous purification of lead but lacks a lot of flexibility since it just maintains the relationships between sulfur, arsenic and copper within a certain range while maintaining the arsenic content at fairly low levels. This process is therefore not applicable to ores which lead to lead which deviates from certain copper, sulfur and arsenic contents.
- this object has been achieved by means of a process for the continuous purification of working lead by cooling, characterized in that said liquid working lead is introduced into a bath of liquid metallic lead thermostatically controlled at a temperature below about 500 ⁇ C and with stirring and by the fact that the pulverulent materials which collect on the surface are recovered.
- agitation must have two components, a peripheral component and a radial or convection component.
- the latter which corresponds to the downward movement along the axis of the tank towards the bottom then along the bottom towards the periphery of the tank, then upwards along the walls and finally on the surface of the bath of the periphery towards the center, is very important for heat exchange between the lead to be purified and the walls of the tank and for maintaining a low temperature gradient.
- the other component, the peripheral also plays a role in maintaining a low temperature gradient because a high peripheral linear speed induces vortex movements, which, through exchanges which they facilitate between the lead-tank interface and the lead located more inside said tank ensures a certain thermal homogeneity in the lead bath. Good results can be obtained by choosing a peripheral speed between 0.5 and 5 meters per second.
- the speed of the convection component in the vicinity of the vertical walls "of the tank is advantageously chosen to be less than the peripheral speed, preferably 0.1 to 0. , 5 times this last.
- the speed in the vicinity of the walls and the bottom of the tank, resulting from the combination of these two components, is such that there is advantageously a difference of at most 20, preferably at most 10 "C, between the temperature of the wall of the tank and that of lead 5 centimeters from this wall
- These components can be produced for example with two types of stirring mobile, the convection component with a turbine agitator whose diameter is less than laughing at half the diameter of the tank and the peripheral component with one or more mobile with substantially vertical blades.
- the temperature of the cauldron is maintained very precisely at the chosen value, less than 500 ⁇ C, preferably between 400 and 450 ⁇ C, and this regulation must be carried out with a tolerance less than 20 ⁇ C. In fact, it should not be too high in temperature, otherwise we would obtain the pasty products mentioned above or large blocks.
- this device for purifying lead from work is characterized in that it comprises a cauldron 1 surrounded by an insulator 3, an es- pace 2 being formed between the insulation 3 and the cauldron 1 to allow air to circulate in this space, to cool the cauldron said air being injected by means of a pipe 4 and evacuated by an annular opening 5 if- killed at the top of the cauldron, the insulator 3 being covered with a coil 6 allowing the cauldron to be heated by induction.
- a cooling phase is a phase of warming and reciprocally 'lies in less than a second.
- the product sold under the trade name "Microtherm” or compounds of similar characteristics, the thermal conductivity of which is less than 0.05, preferably less than 0.03 KCal, will be chosen as insulator. / m / h / ⁇ C, for an average temperature of 500 * C.
- this device allows the evacuation of calories through the walls of the cauldron while maintaining a very low temperature gradient within the latter and this by means of air circulation, or any other fluid. suitable, however that in the event of too rapid a drop in temperature in the cauldron or a temperature gradient between the outer wall and the bath that is too high, it is possible to rapidly supply a significant amount of heat by means of said coil which works by induction.
- the cauldron must also be equipped with a device for extracting powdery dross.
- This device can be chosen from all the devices already known that operate at said temperatures. We can cite for example pneumatic vacuum cleaners, wheels, shovels ...
- This extraction of dross can be carried out in two different ways: either directly in the quenching chau ⁇ drone, or in another tank placed in series. For an installation operating in series, it is advantageous to have a tank placed in series.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Control Of El Displays (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Paper (AREA)
- Glass Compositions (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Processing Of Solid Wastes (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
Description
NOUVEAU PROCÉDÉ DE PURIFICATION DU PLOMB La présente invention a pour objet un nouveau pro¬ cédé de purification d'un plomb impur, souvent appelé "plomb d'oeuvre". Elle a plus particulièrement pour objet un procédé de décuivrage en continu dudit plomb d'oeuvre. NEW LEAD PURIFICATION PROCESS The subject of the present invention is a new process for the purification of an impure lead, often called "lead". More particularly, it relates to a process for continuously descaling said lead.
Le plomb d'oeuvre est en général élaboré dans un four de réduction tels que les fours appelés "water-jacket" , les fours rotatifs ou bien par les procédés ISP (Impérial Smelting Process) et sort de ces fours à une température de 1 000βC environ.The lead is generally produced in a reduction furnace such as ovens called "water-jackets", rotary ovens or by ISP processes (Imperial Smelting Process) and leaves these ovens at a temperature of 1000 β C approximately.
A cette température, de très nombreux métaux ou métalloïdes sont solubles dans le plomb. Parmi ces métaux, métalloïdes ou composés, on peut citer CU2S, PbS, Cu, As, Sb, Sn, etc...At this temperature, many metals or metalloids are soluble in lead. Among these metals, metalloids or compounds, mention may be made of CU2S, PbS, Cu, As, Sb, Sn, etc.
Il est bien connu dans le domaine de la technique que l'on peut, par refroidissement, obtenir une purification du plomb parce qu'aux alentours de 500-600"C la solubilité de ces éléments ou composés dans le plomb baisse brutalement et un certain nombre dé. composés solides s'accumulent a la surface.It is well known in the art that one can, by cooling, obtain a purification of lead because around 500-600 "C the solubility of these elements or compounds in lead drops suddenly and a certain number of solid compounds accumulate on the surface.
Un écumage permet d'éliminer ces impuretés et d'obtenir un plomb plus pur. Toutefois, ce procédé présente de très nombreux inconvénients car il ne peut être réalisé que d'une manière discontinue. Il se forme en effet a la surface de gros blocs qui sont difficiles a écumer et a en¬ lever. On obtient même des produits pâteux qui ne permettent aucune récupération automatique.Skimming removes these impurities and produces a purer lead. However, this process has many drawbacks because it can only be carried out discontinuously. It is formed on the surface of large blocks which are difficult to foam and remove. We even obtain pasty products which do not allow any automatic recovery.
Le problème se présente depuis fort longtemps. On a maintes fois essayé de nouvelles techniques. Parmi cel¬ les-ci, une seule a été mise en oeuvre a l'échelle indus¬ trielle a Port Pirie. C'est un procédé qui propose d'établir un gradient de température entre, d'une part, la surface, de manière a maintenir liquide les composés relargués par le plomb, et d'autre part le plomb lui-même, de manière a faci¬ liter ce relarguage.The problem has been around for a long time. We have tried new techniques many times. Of these, only one has been implemented on an industrial scale in Port Pirie. It is a process which proposes to establish a temperature gradient between, on the one hand, the surface, so as to keep the compounds released by lead liquid, and on the other hand the lead itself, so as to faci¬ liter this release.
Ce procédé a permis une purification du plomb en continu mais manque énormément de souplesse puisqu'il con¬ vient de maintenir les rapports entre le soufre, l'arsenic et le cuivre dans une certaine plage tout en maintenant la teneur en arsenic a des niveaux assez bas. Ce procédé n'est donc pas applicable a des minerais qui conduisent a des plombs qui s'écartent de certaines teneurs en cuivre, en soufre et en arsenic.This process allowed continuous purification of lead but lacks a lot of flexibility since it just maintains the relationships between sulfur, arsenic and copper within a certain range while maintaining the arsenic content at fairly low levels. This process is therefore not applicable to ores which lead to lead which deviates from certain copper, sulfur and arsenic contents.
C'est la raison pour laquelle. a Demanderesse a cherché a mettre en oeuvre de nouveaux procédés qui permet¬ tent de fonctionner en continu tout en étant capables d'ac¬ cepter n'importe quelle teneur en cuivre et en arsenic. Selon la présente invention, ce but a été atteint au moyen d'un procédé dé purification en continu du plomb d'oeuvre par refroidissement, caractérisé par le fait que l'on introduit ledit plomb d'oeuvre liquide dans un bain de plomb métallique liquide thermostaté a une température infé- rieure a environ 500βC et sous agitation et par le fait que l'on récupère les matières pulvérulentes qui s'accumulent a 1 a surface.This is the reason. The Applicant has sought to implement new methods which allow it to operate continuously while being capable of accepting any content of copper and arsenic. According to the present invention, this object has been achieved by means of a process for the continuous purification of working lead by cooling, characterized in that said liquid working lead is introduced into a bath of liquid metallic lead thermostatically controlled at a temperature below about 500 β C and with stirring and by the fact that the pulverulent materials which collect on the surface are recovered.
En effet, on a démontré que lorsque l'on trempe le plomb d'oeuvre brutablement d'une température de 1 OOO'C à une température inférieure a 500*C, on obtient un produit pulvérulent, fluide, non collant, non pâteux et facile a éliminer de la surface du bain de plomb fondu.Indeed, it was demonstrated that when the works of quenched lead brutablement a temperature OOO'C 1 to a temperature below 500 ° C, one obtains a powder product, fluid, non-tacky, non-pasty and easy to remove from the surface of the molten lead bath.
Il a été montré au cours de l'étude qui a mené a la présente invention que certaines contraintes d'agitation doivent être remplies. Ainsi, l'agitation doit avoir deux composantes, une composante périphérique et une composante radiale ou de convection. Cette dernière, qui correspond au mouvement descendant le long de l'axe de ia cuve vers le fonds puis le long du fonds vers la périphérie de la cuve, ensuite vers le haut en longeant les parois et enfin en sur¬ face du bain de la périphérie vers le centre, est très im¬ portante pour l'échange de chaleur entre le plomb à purifier et les parois de la cuve et pour le maintien d'un faible gradient de température. L'autre composante, Ta périphérique, joue égale¬ ment un rôle dans le maintien d'un faible gradient de tempé¬ rature car une forte vitesse linéaire périphérique induit des mouvements tourbillonaires , lesquels, par les échanges thermiques qu'ils facilitent entre l'interface plomb-cuve et le plomb situé plus a l'intérieur de ladite cuve assure une certaine ho ogénéïté thermique dans le bain de plomb. On peut obtenir de bons résultats en choisissant une vitesse périphérique comprise entre 0,5 et 5 mètres par seconde.It has been shown during the study which led to the present invention that certain agitation constraints must be fulfilled. Thus, agitation must have two components, a peripheral component and a radial or convection component. The latter, which corresponds to the downward movement along the axis of the tank towards the bottom then along the bottom towards the periphery of the tank, then upwards along the walls and finally on the surface of the bath of the periphery towards the center, is very important for heat exchange between the lead to be purified and the walls of the tank and for maintaining a low temperature gradient. The other component, the peripheral, also plays a role in maintaining a low temperature gradient because a high peripheral linear speed induces vortex movements, which, through exchanges which they facilitate between the lead-tank interface and the lead located more inside said tank ensures a certain thermal homogeneity in the lead bath. Good results can be obtained by choosing a peripheral speed between 0.5 and 5 meters per second.
Pour diverses raisons et notamment pour éviter une réoxydation du plomb a la surface du bain la vitesse de la composante de convection au voisinage des parois verticales" de la cuve est avantageusement choisie inférieure a la vi- tesse périphérique, de préférence 0,1 a 0,5 fois cette der¬ nière.For various reasons and in particular to avoid reoxidation of the lead on the surface of the bath, the speed of the convection component in the vicinity of the vertical walls "of the tank is advantageously chosen to be less than the peripheral speed, preferably 0.1 to 0. , 5 times this last.
La vitesse au voisinage des parois et du fonds de la cuve, issue de la combinaison de ces deux composantes, est telle qu'il y a avantageusement une différence d'au plus 20, de préférence d'au plus 10"C, entre la température de la paroi de la cuve et celle du plomb a 5 centimètres de cette paroi. Ces composantes peuvent être réalisées par exemple avec deux types de mobile d'agitation, la composante de con¬ vection avec un agitateur turbine dont le diamètre est infé- rieur a la moitié du diamètre de la cuve et la composante périphérique avec un ou plusieurs mobiles a pales sensible¬ ment verticales.The speed in the vicinity of the walls and the bottom of the tank, resulting from the combination of these two components, is such that there is advantageously a difference of at most 20, preferably at most 10 "C, between the temperature of the wall of the tank and that of lead 5 centimeters from this wall These components can be produced for example with two types of stirring mobile, the convection component with a turbine agitator whose diameter is less than laughing at half the diameter of the tank and the peripheral component with one or more mobile with substantially vertical blades.
Par ailleurs, il est nécessaire que la température du chaudron soit maintenue de manière très précise a la va- leur choisie, inférieure a 500βC, de préférence entre 400 et 450βC, et il faut que cette régulation soit effectuée avec une tolérance inférieure a 20βC. En effet, il convient de ne pas être trop élevé en température, faute de quoi on obtien¬ drait les produits pâteux évoqués ci-dessus ou des gros blocs.Furthermore, it is necessary that the temperature of the cauldron is maintained very precisely at the chosen value, less than 500 β C, preferably between 400 and 450 β C, and this regulation must be carried out with a tolerance less than 20 β C. In fact, it should not be too high in temperature, otherwise we would obtain the pasty products mentioned above or large blocks.
En outre, il convient d'éviter une solidification du plomb sur les bords. C'est la raison pour laquelle la De¬ manderesse a été contrainte de concevoir et de mettre en oeuvre un dispositif particulier qui permette une mise en oeuvre aisée dudit procédé.In addition, solidification of the lead at the edges should be avoided. This is the reason why the Applicant has been forced to design and implement a particular device which allows easy implementation of said method.
En se reportant a la figure unique, ce dispositif pour purifier le plomb d'oeuvre est caractérisé par le fait qu'il comporte un chaudron 1 entouré d'un isolant 3, un es- pace 2 étant pratiqué entre l'isolant 3 et le chaudron 1 pour permettre a de l'air de circuler dans cet espace, pour refroidir le chaudron ledit air étant injecté au moyen d'une canalisation 4 et évacué par une ouverture annulaire 5 si- tuée a la partie supérieure du chaudron, l'isolant 3 étant recouvert d'un bobinage 6 permettant de chauffer le chaudron par induction. Par ce système on peut passer d'une phase de refroidissement a une phase de réchauffement et réciproque-' ment en moins d'une seconde. De préférence, on choisira comme isolant le pro¬ duit vendu sous l'appellation commerciale "Microtherme" ou des composés de caractéristiques voisines, dont la caracté¬ ristique de conductibilité thermique est inférieure a 0,05, de préférence inférieure a 0,03 KCal/m/h/βC, pour une te pé- rature moyenne de 500*C.Referring to the single figure, this device for purifying lead from work is characterized in that it comprises a cauldron 1 surrounded by an insulator 3, an es- pace 2 being formed between the insulation 3 and the cauldron 1 to allow air to circulate in this space, to cool the cauldron said air being injected by means of a pipe 4 and evacuated by an annular opening 5 if- killed at the top of the cauldron, the insulator 3 being covered with a coil 6 allowing the cauldron to be heated by induction. Through this system you can go from a cooling phase is a phase of warming and reciprocally 'lies in less than a second. Preferably, the product sold under the trade name "Microtherm" or compounds of similar characteristics, the thermal conductivity of which is less than 0.05, preferably less than 0.03 KCal, will be chosen as insulator. / m / h / β C, for an average temperature of 500 * C.
En fonctionement, ce dispositif permet l'évacua¬ tion des calories par les parois du chaudron tout en mainte¬ nant un très faible gradient de température au sein de ce dernier et ce au moyen de la circulation d'air, ou de tout autre fluide convenable, cependant qu'en cas de baisse trop rapide de la température dans le chaudron ou d'un gradient de température entre la paroi extérieure et le bain trop élevé, il est possible d'apporter rapidement une quantité importante de chaleur au moyen dudit bobinage qui fonctionne par induction.In operation, this device allows the evacuation of calories through the walls of the cauldron while maintaining a very low temperature gradient within the latter and this by means of air circulation, or any other fluid. suitable, however that in the event of too rapid a drop in temperature in the cauldron or a temperature gradient between the outer wall and the bath that is too high, it is possible to rapidly supply a significant amount of heat by means of said coil which works by induction.
Le chaudron doit également être équipé d'un dispo¬ sitif d'extraction des crasses pulvérulentes. Ce dispositif peut être choisi dans tous les dispositifs déjà connus fonc¬ tionnant auxdites températures. On peut citer par exemple les aspirateurs pneumatiques, les roues, les pelles...The cauldron must also be equipped with a device for extracting powdery dross. This device can be chosen from all the devices already known that operate at said temperatures. We can cite for example pneumatic vacuum cleaners, wheels, shovels ...
Cette extraction des crasses peut être réalisée de deux manières différentes : soit directement dans le chau¬ dron de trempe, soit dans une autre cuve placée en série. Pour une installation fonctionnant en série, on a intérêt a avoir une cuve placée en série.This extraction of dross can be carried out in two different ways: either directly in the quenching chau¬ drone, or in another tank placed in series. For an installation operating in series, it is advantageous to have a tank placed in series.
On peut poursuivre l'affinage du plomb après l'avoir débarassé de ses crasses (parfois désignées par l'anglicisme "dross") en réitérant la même opération a l'aide d'un système identique au premier mais a une tempéra¬ ture qui est régulée avec précision (± 5βC, de préférence ± 2*C) autour d'une valeur choisie entre 320 et 340βC. Cette opération peunt être, dans certains cas, avantageusement utilisée avec un apport de composés susceptibles d'engendrer du soufre tels que par exemple la pyrite et le soufre élé¬ mentaire lui-même.We can continue the refining of lead after having rid it of its filth (sometimes designated by anglicism "dross") by repeating the same operation a using a system identical to the first but with a temperature which is precisely regulated (± 5 β C, preferably ± 2 * C) around a value chosen between 320 and 340 β C. This operation can be, in certain cases, advantageously used with a contribution of compounds capable of generating sulfur such as for example pyrite and the elementary sulfur itself.
On peut également réaliser une adjonctin de tout composé susceptible de faire avec le cuivre des insolubles . dans le plomb a haut point de fusion, c'est-â-dire à un point de fusion sensiblement supérieur a celui du plomb en cours d'affinage. One can also make an adjunctin of any compound capable of making insoluble materials with copper. in lead with a high melting point, that is to say at a melting point appreciably higher than that of lead during refining.
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BR8505003A BR8505003A (en) | 1984-02-03 | 1985-02-04 | CONTINUOUS PURIFICATION PROCESS FOR WORKING LEAD BY COOLING AND DEVICE TO PURIFY WORKING LEAD |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR84/01740 | 1984-02-03 | ||
| FR8401740A FR2559161A1 (en) | 1984-02-03 | 1984-02-03 | NEW LEAD PURIFICATION PROCESS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1985003526A1 true WO1985003526A1 (en) | 1985-08-15 |
Family
ID=9300771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR1985/000017 Ceased WO1985003526A1 (en) | 1984-02-03 | 1985-02-04 | New process for purifying lead |
Country Status (13)
| Country | Link |
|---|---|
| EP (1) | EP0152332B1 (en) |
| JP (1) | JPH0613740B2 (en) |
| AT (1) | ATE45188T1 (en) |
| BR (1) | BR8505003A (en) |
| CA (1) | CA1259494A (en) |
| DE (1) | DE3572010D1 (en) |
| ES (1) | ES8602146A1 (en) |
| FI (1) | FI78124C (en) |
| FR (1) | FR2559161A1 (en) |
| GR (1) | GR850275B (en) |
| MA (1) | MA20339A1 (en) |
| MX (1) | MX168094B (en) |
| WO (1) | WO1985003526A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2659665B1 (en) * | 1990-03-15 | 1992-07-24 | Metaleurop Sa | PROCESS FOR REFINING, ESPECIALLY DE-PITCHING, LEAD. |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2956871A (en) * | 1958-02-10 | 1960-10-18 | American Smelting Refining | Vacuum dezincing of lead |
| FR1369339A (en) * | 1962-12-27 | 1964-08-14 | Broken Hill Ass Smelter | Process for skimming unrefined lead copper and apparatus for its implementation |
| US3392011A (en) * | 1963-08-12 | 1968-07-09 | Metallgesellschaft Ag | Method for removal of copper from lead |
| GB2013248A (en) * | 1978-01-30 | 1979-08-08 | Kloeckner Humboldt Deutz Ag | Refining molten metal |
| US4425160A (en) * | 1982-11-23 | 1984-01-10 | Gnb Batteries Inc. | Refining process for removing antimony from lead bullion |
| US4427629A (en) * | 1982-11-23 | 1984-01-24 | Gnb Batteries Inc. | Process for metal-enrichment of lead bullion |
| EP0099711A2 (en) * | 1982-07-16 | 1984-02-01 | BNF Metals Technology Centre | Continuous method of removing tin from lead |
-
1984
- 1984-02-03 FR FR8401740A patent/FR2559161A1/en not_active Withdrawn
-
1985
- 1985-01-30 MA MA20563A patent/MA20339A1/en unknown
- 1985-01-31 EP EP85400154A patent/EP0152332B1/en not_active Expired
- 1985-01-31 GR GR850275A patent/GR850275B/el unknown
- 1985-01-31 ES ES540013A patent/ES8602146A1/en not_active Expired
- 1985-01-31 CA CA000473256A patent/CA1259494A/en not_active Expired
- 1985-01-31 AT AT85400154T patent/ATE45188T1/en not_active IP Right Cessation
- 1985-01-31 MX MX204189A patent/MX168094B/en unknown
- 1985-01-31 DE DE8585400154T patent/DE3572010D1/en not_active Expired
- 1985-02-01 JP JP60018465A patent/JPH0613740B2/en not_active Expired - Lifetime
- 1985-02-01 FI FI850430A patent/FI78124C/en not_active IP Right Cessation
- 1985-02-04 WO PCT/FR1985/000017 patent/WO1985003526A1/en not_active Ceased
- 1985-02-04 BR BR8505003A patent/BR8505003A/en not_active IP Right Cessation
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2956871A (en) * | 1958-02-10 | 1960-10-18 | American Smelting Refining | Vacuum dezincing of lead |
| FR1369339A (en) * | 1962-12-27 | 1964-08-14 | Broken Hill Ass Smelter | Process for skimming unrefined lead copper and apparatus for its implementation |
| US3392011A (en) * | 1963-08-12 | 1968-07-09 | Metallgesellschaft Ag | Method for removal of copper from lead |
| GB2013248A (en) * | 1978-01-30 | 1979-08-08 | Kloeckner Humboldt Deutz Ag | Refining molten metal |
| EP0099711A2 (en) * | 1982-07-16 | 1984-02-01 | BNF Metals Technology Centre | Continuous method of removing tin from lead |
| US4425160A (en) * | 1982-11-23 | 1984-01-10 | Gnb Batteries Inc. | Refining process for removing antimony from lead bullion |
| US4427629A (en) * | 1982-11-23 | 1984-01-24 | Gnb Batteries Inc. | Process for metal-enrichment of lead bullion |
Also Published As
| Publication number | Publication date |
|---|---|
| FI850430A0 (en) | 1985-02-01 |
| EP0152332A2 (en) | 1985-08-21 |
| FI850430L (en) | 1985-08-04 |
| FI78124B (en) | 1989-02-28 |
| MA20339A1 (en) | 1985-10-01 |
| GR850275B (en) | 1985-05-28 |
| ES540013A0 (en) | 1985-11-16 |
| BR8505003A (en) | 1986-01-21 |
| FI78124C (en) | 1989-06-12 |
| ES8602146A1 (en) | 1985-11-16 |
| MX168094B (en) | 1993-05-03 |
| JPH0613740B2 (en) | 1994-02-23 |
| FR2559161A1 (en) | 1985-08-09 |
| ATE45188T1 (en) | 1989-08-15 |
| CA1259494A (en) | 1989-09-19 |
| JPS60234929A (en) | 1985-11-21 |
| EP0152332A3 (en) | 1985-09-18 |
| EP0152332B1 (en) | 1989-08-02 |
| DE3572010D1 (en) | 1989-09-07 |
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