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WO2013013321A1 - Utilisation d'un flux de sel tertiaire de nacl, kcl et mgcl2 pour la purification d'aluminium et d'alliages d'aluminium, et procédé correspondant - Google Patents

Utilisation d'un flux de sel tertiaire de nacl, kcl et mgcl2 pour la purification d'aluminium et d'alliages d'aluminium, et procédé correspondant Download PDF

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Publication number
WO2013013321A1
WO2013013321A1 PCT/CA2012/050507 CA2012050507W WO2013013321A1 WO 2013013321 A1 WO2013013321 A1 WO 2013013321A1 CA 2012050507 W CA2012050507 W CA 2012050507W WO 2013013321 A1 WO2013013321 A1 WO 2013013321A1
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Prior art keywords
weight
naci
particles
kci
mgci
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Ceased
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PCT/CA2012/050507
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English (en)
Inventor
Sylvain Tremblay
Luc Desrosiers
Daniel LÉVESQUE
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Pyrotek Inc
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Pyrotek Inc
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Publication date
Priority claimed from CA 2747650 external-priority patent/CA2747650A1/fr
Priority claimed from US13/192,889 external-priority patent/US20120017726A1/en
Application filed by Pyrotek Inc filed Critical Pyrotek Inc
Publication of WO2013013321A1 publication Critical patent/WO2013013321A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • C22B21/00—Obtaining aluminium
    • C22B21/06—Obtaining aluminium refining
    • C22B21/062—Obtaining aluminium refining using salt or fluxing agents
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium

Definitions

  • the published US patent application No. US-2010-0307293 relates to the use of a binary salt flux comprising NaCI and MgC ⁇ for the purification of a metal selected from the group consisting of aluminum and aluminum alloys, more particularly for the removal of alkali and alkaline-earth metals.
  • This invention also relates to a method for the purification of said metal with said binary salt flux.
  • Those NaCI/MgC binary mixtures have shown unexpected economical advantages with respect to KCI/MgC binary mixtures and few NaCI/KCI/MgC tertiary mixtures that were also known, for the purification of a metal selected from the group consisting of aluminum and aluminum alloys, more particularly for the removal of alkali and alkaline-earth metals.
  • these selected tertiary mixtures according to the invention further show a low melting point.
  • the invention also relates to a method for the purification of said metal with said selected ternary salt flux.
  • Fluxes can be used to form a protecting layer at the surface of an alloy to prevent oxidation.
  • fluxes contain chemical active agents, they can be used to clean furnace walls by softening accumulated layers of corundum. Some exothermic fluxes are also used for cleaning dross and removing aluminum trapped in oxide layers.
  • Fluxes that are based on alkali chlorides and alkaline-earth chlorides are also used for the refining of alloys. Those skilled in the art generally define refining as the removal of alkali and alkaline-earth metals, non metallic inclusions and hydrogen from the alloys.
  • Sodium and calcium are always present as impurities in aluminum obtained from the Hall-Heroult process. Lithium fluoride is often added to the electrolytic bath to improve the efficiency of cells. However, a small amount in the metallic state is found dissolved in the aluminum. These impurities entail quality issues. For example, in an alloy containing magnesium, the presence of sodium may interfere during the hot rolling processes. The presence of sodium in aluminum and silicon alloys neutralize the effect of phosphorus used for the refining of grains. For the above-mentioned reasons, the use of fluxes containing sodium is not recommended for aluminum and its alloys, more particularly for aluminum alloys comprising a magnesium content higher than 3 % by weight or a silicon content higher than 10 % by weight. [0009] Also, the presence of hydrogen in too high concentration may lead to a too high porosity of the aluminum during its solidification. During the recycling of aluminum, the presence of non metallic inclusions is important.
  • MgCI 2 is one of the chemical active agents used for the withdrawal of impurities in alloys. Its concentration has a direct effect on the kinetic of withdrawal of calcium and sodium. Its melting point is 714 ⁇ , but in common fluxes, it is mixed with other salts to obtain a melting point between 400 and 550 ⁇ . However, MgCI 2 is hygroscopic and can not be exposed for a long period of time to the surrounding air. Fluxes obtained by fusion of salts comprising magnesium chloride have hygroscopic properties. Consequently, the packaging is an important factor in limiting the absorption of humidity during the manufacturing of such fluxes.
  • US patent no. 1 ,377,374 relates to the use of a flux having an equimolar composition of sodium chloride and magnesium chloride for the production of manganese or magnesium alloys.
  • US patent no. 1 ,754,788 relates to the use of this same flux in a process for the cleaning of magnesium.
  • US patent no. 1 ,519,128 relates to the addition of calcium chloride to this composition and
  • US patent no. 2,262,105 relates to the addition of potassium chloride and magnesium oxide in addition to the calcium chloride.
  • US patent no. 5,405,427 mentions a flux based on sodium chloride, magnesium chloride, potassium chloride and carbon for the treatment of metal.
  • the refining fluxes are usually composed of alkali chlorides or alkaline- earth chlorides, which are mixed to obtain melting points that are lower than the operating temperature of alloys - the melting point of pure compounds being usually quite high.
  • US patent no. 4,099,965 relates to a method where a flux of KCI and MgCI 2 is added in solid form in the bottom of a preheated container before the addition of aluminum. More currently, fluxes are added by an inert gas in a pipe under the surface of the metal (lance fluxing). Recently, a method was developed where a hollow shaft brings the salt flux in the alloy with a gas carrier, and the salt flux is dispersed by an agitator (rotary flux injection). This method reduces the amount of salt flux required for carrying out the purification while increasing the dispersion of this salt flux in the alloy.
  • salt fluxes such as binary mixtures of magnesium chloride and potassium chloride
  • costs related to salt fluxes are high.
  • the use of salt fluxes having a substantial content in sodium chloride is not recommended by those skilled in the art due to perceived negative effects of sodium content in the resulting aluminum or aluminum alloys.
  • sodium chloride when sodium chloride is present in fluxes for the purification of aluminum or aluminum alloys, those skilled in the art currently will avoid or limit the use of sodium chloride. More particularly, in the case of certain kinds of alloys such as, for example, aluminum alloys having silicon content higher than 10% by weight and more particularly aluminum alloys having magnesium content higher than 3% by weight, those skilled in the art currently recommend not using sodium chloride in salt flux.
  • these selected tertiary salt fluxes of NaCI, KCI, and MgCI 2 also relates to a method for the purification of said metal with said selected ternary salt flux.
  • Embodiments of the selected tertiary salt fluxes of NaCI, KCI, and MgCI 2 making the object of the present invention show the following advantages:
  • a first preferred aspect of the published US patent application No. US- 2010-0307293 is related to the use of a salt flux for the purification of a metal selected from the group consisting of aluminum and aluminum alloys, said metal being in liquid phase and said salt flux being a binary mixture of NaCI and MgC ⁇ .
  • a second preferred aspect of the published US patent application No. US-2010-0307293 is related to a method for the purification of a metal selected from the group consisting of aluminum and aluminum alloys, wherein said method comprises:
  • • is a binary mixture of particles of NaCI and particles of MgCI 2 ;
  • • consists of particles resulting from the grinding of a fused salt of NaCI and MgCI 2 in solid state; or • is a liquid mixture of NaCI and MgC ⁇ .
  • Another embodiment of the published the US patent application No. US-201 0-0307293 is related to a use or a method as defined in any one of the above-mentioned embodiments, wherein the binary mixture comprises: a) from 40 to 50% by weight of NaCI; and b) from 50 to 60% by weight of MgCI 2 . More particularly, this binary mixture comprises 45% by weight of NaCI and 55% by weight of MgC ⁇ to form an eutectic mixture having a melting point of about 439 ⁇ .
  • Another embodiment of the invention of the published US patent application No. US-201 0-0307293 is related to a use or a method as defined in any one of the above-mentioned embodiments, wherein when the salt flux is in the form of particles, those particles have an average particle size between 1 00 m and 3.35 mm.
  • said particles may have a particle size between 0.85 mm and 3.1 5 mm or between 100 ⁇ ⁇ and 1 mm.
  • Another embodiment of the published US patent application No. US- 2010-0307293 is related to a use or a method as defined in any one of the above- mentioned embodiments, wherein the particles are contacted with the liquid metal by injection with a gas injection equipment.
  • a non limiting example of a gas injection equipment may consist of a rotary injector known under the tradename SNI F PHD- 50 commercialized by the Applicant.
  • Another embodiment of the published US patent application No. US- 2010-0307293 is related to a use or a method as defined in any one of the above- mentioned embodiments, wherein the metal is an aluminum alloy having a magnesium content higher than 3% by weight.
  • Another embodiment of the published US patent application No. US- 2010-0307293 is related to a use or a method as defined in any one of the above- mentioned embodiments, wherein the metal is an aluminum alloy having a silicon content higher than 10% by weight.
  • An embodiment of the present invention relates to a method for the purification of a metal selected from the group consisting of aluminum and aluminum alloys, wherein said method comprises:
  • salt flux consisting of a tertiary mixture of NaCI, KCI, and MgCI 2 , said salt flux being selected in the group consisting of: ⁇ salt fluxes in the form of a tertiary mixture of particles and comprising more than 22 % by weight of NaCI;
  • Another embodiment of the present invention relates to a method as defined hereinabove, wherein said salt flux is a ternary mixture of particles of NaCI, KCI, and MgCI 2 , wherein more than 22 % by weight of said tertiary mixture consists of NaCI.
  • Another embodiment of the present invention relates to a method as defined hereinabove, wherein the ternary mixture of particles of NaCI, KCI, and MgCI 2 , comprises: a) from more than 22 to 30 % by weight of NaCI, b) from 5 to 43 % by weight of KCI, and c) from 35 to 65 % by weight of MgCI 2 .
  • Another embodiment of the present invention relates to a method as defined hereinabove, wherein the ternary mixture of particles of NaCI, KCI, and MgCI 2 , comprises: a) 25 % by weight of NaCI, b) 15 % by weight of KCI, and c) 60 % by weight of particles of MgCI 2 ; said tertiary mixture having a melting point of about 417 ⁇ .
  • Another embodiment of the present invention relates to a method as defined hereinabove, wherein the ternary mixture of particles of NaCI, KCI, and MgCI 2, have an average particle size comprised between 100 ⁇ and 3.35mm, or comprised between 0.85 mm and 3.15 mm, or comprised between 100 ⁇ and 1 mm.
  • Another embodiment of the present invention relates to a method as defined hereinabove, wherein the ternary mixture of particles of NaCI, KCI, and MgC , are contacted with the liquid metal by injection with a gas injection equipment.
  • Another embodiment of the present invention relates to a method as defined hereinabove, wherein said salt flux is in the form of particles obtained by grinding a fused salt of NaCI, KCI and MgCI 2 , having the following formulations: o 5-18 % by weight of NaCI, o 17-60 % by weight of KCI, o 35-65 % by weight of MgCI 2 .
  • Another embodiment of the present invention relates to a method as defined hereinabove, wherein said salt flux is in the form of particles obtained by grinding a fused salt of NaCI, KCI and MgCI 2 , having the following formulations: o 22-55 % by weight of NaCI, o 13-43 % by weight of KCI, and o 35-65 % by weight of MgCI 2 .
  • Another embodiment of the present invention relates to a method as defined hereinabove, wherein said salt flux is in the form of particles obtained by grinding a fused salt of NaCI, KCI and MgCI 2, having the following formulations: o 25 % by weight of NaCI, o 15 % by weight of KCI, and o 60 % by weight of MgCI 2 ; said tertiary mixture having a melting point of about 417 ⁇ .
  • Another embodiment of the present invention relates to a method as defined hereinabove, wherein said salt flux is in the form of particles obtained by grinding a fused salt of NaCI, KCI and MgCI 2, have an average particle size comprised between 100 ⁇ and 3.35mm, or comprised between 0.85 mm and 3.15 mm, or comprised between 100 ⁇ and 1 mm.
  • Another embodiment of the present invention relates to a method as defined hereinabove, wherein said salt flux is in the form of particles obtained by grinding a fused salt of NaCI, KCI and MgCI 2 , are contacted with the liquid metal by injection with a gas injection equipment.
  • Another embodiment of the present invention relates to a method as defined hereinabove, wherein said salt flux is a liquid tertiary mixture of NaCI, KCI, and MgCI 2 .
  • Another embodiment of the present invention relates to a method as defined hereinabove, wherein said salt flux is in the form of a liquid tertiary mixture of NaCI, KCI, and MgCI 2 comprising:
  • Another embodiment of the present invention relates to a method as defined hereinabove, wherein said salt flux is in the form of a liquid tertiary mixture of NaCI, KCI, and MgCI 2 comprising more than 22 % by weight of said liquid tertiary mixture consists of NaCI.
  • Another embodiment of the present invention relates to a method as defined hereinabove, wherein said salt flux is in the form of a liquid tertiary mixture of NaCI, KCI, and MgCI 2 comprising
  • Another embodiment of the present invention relates to a method as defined hereinabove, wherein said salt flux is in the form of a liquid tertiary mixture of NaCI, KCI, and MgCI 2 comprising:
  • Another embodiment of the present invention relates to a method as defined hereinabove, wherein the metal is an aluminum alloy having a magnesium content higher than 3 % by weight.
  • Another embodiment of the present invention relates to a method as defined hereinabove, wherein the metal is an aluminum alloy having a silicon content higher than 10 % by weight.
  • An embodiment of the present invention relates to a use for the purification of a metal selected from the group consisting of aluminum and aluminum alloys, wherein said use comprises:
  • salt flux consisting of a tertiary mixture of NaCI, KCI, and MgCI 2 , said salt flux being selected in the group consisting of:
  • salt fluxes in the form of a liquid tertiary mixture relates to a use as defined hereinabove, wherein said salt flux is a ternary mixture of particles of NaCI, KCI, and MgC , wherein more than 22 % by weight of said tertiary mixture consists of NaCI.
  • the ternary mixture of particles of NaCI, KCI, and MgC comprises: a) from more than 22 to 30 % by weight of NaCI, b) from 5 to 43 % by weight of KCI, and c) from 35 to 65 % by weight of MgCI 2 .
  • Another embodiment of the present invention relates to a use as defined hereinabove, wherein the ternary mixture of particles of NaCI, KCI, and MgCI 2 , comprises: a) 25 % by weight of NaCI, b) 15 % by weight of KCI, and c) 60 % by weight of particles of MgCI 2 ; said tertiary mixture having a melting point of about 417 ⁇ .
  • Another embodiment of the present invention relates to a use as defined hereinabove, wherein the ternary mixture of particles of NaCI, KCI, and MgCb, have an average particle size comprised between 100 ⁇ and 3.35mm, or comprised between 0.85 mm and 3.15 mm, or comprised between 100 ⁇ and 1 mm.
  • Another embodiment of the present invention relates to a use as defined hereinabove, wherein the ternary mixture of particles of NaCI, KCI, and MgC , are contacted with the liquid metal by injection with a gas injection equipment.
  • Another embodiment of the present invention relates to a use as defined hereinabove, wherein said salt flux is in the form of particles obtained by grinding a fused salt of NaCI, KCI and MgCI 2 , having the following formulations: o 5-18 % by weight of NaCI, o 17-60 % by weight of KCI, o 35-65 % by weight of MgCI 2 .
  • Another embodiment of the present invention relates to a use as defined hereinabove, wherein said salt flux is in the form of particles obtained by grinding a fused salt of NaCI, KCI and MgCI 2 , having the following formulations: o 22-55 % by weight of NaCI, o 13-43 % by weight of KCI, and o 35-65 % by weight of MgCI 2 .
  • Another embodiment of the present invention relates to a use as defined hereinabove, wherein said salt flux is in the form of particles obtained by grinding a fused salt of NaCI, KCI and MgCI 2, having the following formulations: o 25 % by weight of NaCI, o 15 % by weight of KCI, and o 60 % by weight of MgCI 2 ; said tertiary mixture having a melting point of about 417 ⁇ C.
  • Another embodiment of the present invention relates to a use as defined hereinabove, wherein said salt flux is in the form of particles obtained by grinding a fused salt of NaCI, KCI and MgCI 2 , have an average particle size comprised between 100 ⁇ and 3.35mm, or comprised between 0.85 mm and 3.15 mm, or comprised between 100 ⁇ and 1 mm.
  • Another embodiment of the present invention relates to a use as defined hereinabove, wherein said salt flux is in the form of particles obtained by grinding a fused salt of NaCI, KCI and MgCI 2, are contacted with the liquid metal by injection with a gas injection equipment.
  • Another embodiment of the present invention relates to a use as defined hereinabove, wherein said salt flux is a liquid tertiary mixture of NaCI, KCI, and MgCI 2 .
  • Another embodiment of the present invention relates to a use as defined hereinabove, wherein said salt flux is in the form of a liquid tertiary mixture of NaCI, KCI, and MgCI 2 comprising:
  • Another embodiment of the present invention relates to a use as defined hereinabove, wherein said salt flux is in the form of a liquid tertiary mixture of NaCI, KCI, and MgCI 2 comprising more than 22 % by weight of said liquid tertiary mixture consists of NaCI.
  • Another embodiment of the present invention relates to a use as defined hereinabove, wherein said salt flux is in the form of a liquid tertiary mixture of NaCI, KCI, and MgCI 2 comprising
  • Another embodiment of the present invention relates to a use as defined hereinabove, wherein said salt flux is in the form of a liquid tertiary mixture of NaCI, KCI, and MgCI 2 comprising: ⁇ 25 % by weight of NaCI,
  • Another embodiment of the present invention relates to a use as defined hereinabove, wherein the metal is an aluminum alloy having a magnesium content higher than 3 % by weight.
  • Another embodiment of the present invention relates to a used as defined hereinabove, wherein the metal is an aluminum alloy having a silicon content higher than 10 % by weight.
  • Figure 1 a phase diagram of a fused salt KCI/NaCI/MgCI 2
  • Figure 2 a phase diagram of a fused salt KCI/MgCI 2 ;
  • Figure 3 a phase diagram of a fused salt NaCI/MgCI 2 ;
  • Figure 5 a comparative graphic concerning examples 9 to 12. Phase diagrams of Figures 1 to 3 were extracted from factsage web site (http://factsage.com).
  • example 1 illustrates an unexpected effect with regard to the sodium concentration in an aluminum alloy when NaCI is added in a liquid aluminum alloy, that is, no increase of the sodium content in the alloy obtained. Said example 1 is reproduced hereinafter.
  • each salt flux was made by mixing the salts in an anhydrous solid phase in an appropriate oven. Then, by increasing the temperature of the oven, a fused compound in liquid form was obtained. The liquid was then cooled down quickly, grinded and sifted to obtain a granulometry that was appropriate for the selected method.
  • the salt flux was made only by mixing the salts in an anhydrous solid phase.
  • Salt fluxes have shown an optimal efficiency for the withdrawal of Ca, Na and Li when used with a rotary injector such as a SNIF PHD-50 (tradename) commercialized by the Applicant (Pyrotek).
  • a rotary injector such as a SNIF PHD-50 (tradename) commercialized by the Applicant (Pyrotek).
  • concentrations of salt fluxes required to carry out the purification may vary depending on the selected method.
  • a salt flux consisting of a binary mixture of 45 wt % NaCI and 55 wt % MgCI 2 were agitated in 1 .5 kg of a liquid AA1 100 aluminum alloy (sold under the trademark Alcan) in which 5 wt % of magnesium were added.
  • the crucible was maintained at 720 ⁇ during 90 minutes and samples were taken every 30 minutes.
  • the sodium level in the crucible was maintained at a minimal level of 3 ppm during the whole experiment, showing that an addition of a flux comprising NaCI does not involve an absorption of sodium in an aluminum alloy with high magnesium content.
  • the salt flux was prepared from NaCI in powder form and sold under the trademark SI FTO INDUSTRIAL and MgCI 2 in flake form and sold under the trademark SKYLINE.
  • a salt flux consisting of a ternary mixture of 20 wt % NaCI, 20 wt % KCI and 60 wt % MgCI 2 were agitated and added in 1 .5 kg of a liquid AA1 1 00 aluminum alloy (sold under the trademark Alcan) in which 5 wt % of magnesium were added.
  • the crucible was maintained at 720 ⁇ during 90 minutes and samples were taken every 30 minutes.
  • the sodium level in the crucible was maintained at a minimal level of 3 ppm during the whole experiment, showing that an addition of a ternary flux comprising a small amount of NaCI does not involve an absorption of sodium in an aluminum alloy with high magnesium content.
  • the salt flux was prepared from NaCI in powder form and sold under the trademark SIFTO INDUSTRIAL, KCI in powder form and sold under the trademark IMC KALIUM and MgC ⁇ in flake form and sold under the trademark SKYLINE.
  • Example 4 Example 4:
  • salt flux made of 45 wt % NaCI and 55 wt % MgCI 2 were added to the resulting alloy while agitating it in order to further purify it.
  • the salt flux was prepared from NaCI in powder form and sold under the trademark SIFTO INDUSTRIAL and MgCI 2 in flake form and sold under the trademark SKYLINE.
  • Fifty grams of a flux were prepared in a small alumina crucible by mixing 22.5 grams of NaCI in powder form and sold under the trademark SI FTO INDUSTRIAL, and 27.5 grams of MgC ⁇ in flake form and sold under the trademark SKYLINE. The mixture was subjected to a temperature of 550 ⁇ during 45 minutes. The liquid mixture obtained was then poured into an enamelled-coated bowl for quick solidification. The salt flux obtained was then grinded with in a mortar and sifted. The fraction having a particle size lower than 3150 microns and higher than 1 05 microns was recovered.
  • Example 6 Fifty grams of a salt flux were prepared in a small alumina crucible by mixing 1 0 grams of NaCI in powder form and sold under the trademark SI FTO INDUSTRIAL, 10 grams of KCI in powder form and sold under the trademark IMC KALIUM, and 30 grams of MgCI 2 in flake form and sold under the trademark SKYLINE. The mixture was subjected to a temperature of 550 ⁇ during 45 minutes. The liquid mixture obtained was then poured into an enamelled-coated bowl for quick solidification. The salt flux obtained was then grinded in a mortar and sifted. The fraction having a particle size lower than 3150 microns and higher than 105 microns was recovered.
  • Exemple 7 Fifty grams of a salt flux were prepared only by mixing 22.5 grams of NaCI in powder form and sold under the trademark SI FTO INDUSTRIAL with a granulometry 95% lower than 840 microns and 95 % higher than 300 microns, and 27.5 grams of MgCI 2 in flake form and sold under the trademark SKYLINE with a granulometry 90 % lower than 4.7 mm and 85 % higher to 1 mm.
  • PROMAG SI (trademark) formed of 40 wt % KCI and 60 wt % MgCI 2 , with a granulometry 99% lower than 3150 microns and 95 % higher than 850 microns, were added to the alloy doped with calcium while agitating for 2 minutes. The agitation was stopped and samples were later taken immediately after the end of the agitation as well as 30, 60 and 90 minutes later.
  • Fifty grams of flux were prepared by mixing 12.5 grams of NaCI in powder form (sold under the trademark Sifto Industrial), 7.5 grams of KCI in powder form (sold under the trademark IMC Kalium) and 30 grams of anhydrous MgCI 2 in flake form (sold under the trademark Slyline), in a small alumina crucible. The mixture was exposed at a temperature of 535 ⁇ until completely melt. The liquid mixture obtained was then poured into an enamelled-coated bowl for quick solidification. The salt flux obtained was then grinded in a mortar and sifted. The fraction having a particle size lower than 3150 microns and higher than 105 microns was recovered.
  • Fifty grams of flux were prepared by mixing 10 grams of NaCI in powder form (sold under the trademark Sifto Industrial), 10 grams of KCI in powder form (sold under the trademark IMC Kalium) and 30 grams of anhydrous MgC ⁇ in flake form (sold under the trademark Slyline), in a small alumina crucible. The mixture was exposed at a temperature of 535 ⁇ until completely melt. The liquid mixture obtained was then poured into an enamelled-coated bowl for quick solidification. The salt flux obtained was then grinded in a mortar and sifted. The fraction having a particle size lower than 3150 microns and higher than 105 microns was recovered.
  • Fifty grams of flux were prepared by mixing 12.5 grams of NaCI in powder form (sold under the trademark Sifto Industrial), 10 grams of KCI in powder form (sold under the trademark IMC Kalium) and 27.5 grams of anhydrous MgCI 2 in flake form (sold under the trademark Slyline), in a small alumina crucible. The mixture was exposed at a temperature of 535 ⁇ until completely melt. The liquid mixture obtained was then poured into an enamelled-coated bowl for quick solidification. The salt flux obtained was then grinded in a mortar and sifted. The fraction having a particle size lower than 3150 microns and higher than 105 microns was recovered.
  • Fifty grams of flux were prepared by mixing 5 grams of NaCI in powder form (sold under the trademark Sifto Industrial), 22.5 grams of KCI in powder form (sold under the trademark IMC Kalium) and 22.5 grams of anhydrous MgC ⁇ in flake form (sold under the trademark Slyline), in a small alumina crucible. The mixture was exposed at a temperature of 535 ⁇ until completely melt. The liquid mixture obtained was then poured into an enamelled-coated bowl for quick solidification. The salt flux obtained was then grinded in a mortar and sifted. The fraction having a particle size lower than 3150 microns and higher than 105 microns was recovered.
  • Example 18 Seventy grams of flux were prepared by mixing 1 0.024 grams of NaCI in powder form (sold under the trademark Sifto Industrial), 19.1 73 grams of KCI in powder form (sold under the trademark IMC Kalium) and 40.803 grams of anhydrous MgCI 2 in flake form (sold under the trademark Slyline), in a small alumina crucible. The mixture was exposed at a temperature of 560 ⁇ f or 30 minutes. The crucible was then removed from the oven and isolated in wool for the cooling. The temperature of the mixture was recorded until being stable. The melting point was of 430 ⁇ .

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Abstract

L'invention porte sur un procédé et une utilisation pour la purification d'un métal choisi dans le groupe consistant en l'aluminium et les alliages d'aluminium, ledit métal étant dans une phase liquide et étant mis en contact avec un flux de sel consistant en un mélange ternaire choisi de NaCl, KCl et MgCl2
PCT/CA2012/050507 2011-07-28 2012-07-26 Utilisation d'un flux de sel tertiaire de nacl, kcl et mgcl2 pour la purification d'aluminium et d'alliages d'aluminium, et procédé correspondant Ceased WO2013013321A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CA 2747650 CA2747650A1 (fr) 2011-07-28 2011-07-28 Utilisation de flux de sel tertiaire de naci, kci et mgci2 pour la purification de l'aluminium ou d'alliages d'aluminium et methode connexe
US13/192,889 US20120017726A1 (en) 2009-06-08 2011-07-28 Use of a tertiary salt flux of nacl, kci and mgcl2 for the purification of aluminium or aluminium alloys, and method thereof
CA2747650 2011-07-28
US13/192,889 2011-07-28

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Cited By (1)

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CN111961925A (zh) * 2020-08-12 2020-11-20 佛山市三水凤铝铝业有限公司 一种铝合金铸棒的制备方法

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Publication number Priority date Publication date Assignee Title
GB1367069A (en) * 1970-10-22 1974-09-18 British Aluminium Co Ltd Removal of non-metallic constituents from liquid metal
WO2010142025A1 (fr) * 2009-06-08 2010-12-16 Pyrotek Inc. Utilisation d'un flux salin binaire de nacl et de mgcl2 pour la purification d'aluminium ou d'alliages d'aluminium et procédé correspondant

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1367069A (en) * 1970-10-22 1974-09-18 British Aluminium Co Ltd Removal of non-metallic constituents from liquid metal
WO2010142025A1 (fr) * 2009-06-08 2010-12-16 Pyrotek Inc. Utilisation d'un flux salin binaire de nacl et de mgcl2 pour la purification d'aluminium ou d'alliages d'aluminium et procédé correspondant

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ZHOLNIN ET AL.: "Choice of Additions to NaCl-KCl Mixture for Aluminum Refining from Alkali and Alkali-Earth Impurities.", TMS LIGHT METALS, 2005, pages 973 - 976 *

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CN111961925A (zh) * 2020-08-12 2020-11-20 佛山市三水凤铝铝业有限公司 一种铝合金铸棒的制备方法
CN111961925B (zh) * 2020-08-12 2022-04-08 佛山市三水凤铝铝业有限公司 一种铝合金铸棒的制备方法

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