KR900700660A - Salt based melting process - Google Patents

Abstract

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Description

Salt based melting process

Since this is an open matter, no full text was included.

1 is a schematic diagram showing the overall process of the present invention,

2-4 show other embodiments of the process for feeding scrap to the molten salt.

Claims (37)

A continuous process for melting and purifying an aluminum beverage can scrap or scheme containing impurities, the process comprising: (a) heating the molten salt in a heating chamber and (b) aluminum in the charging chamber to form a molten charge mixture. Separating the aluminum metal from the impurities in the molten charge mixture by mixing the scram or scheme with the heated salt and (c) coalescing to form a separate impurity containing salt sludge with the molten aluminum metal pad, d) chlorinating a portion of the salt sludge in an amount sufficient to control the oxide concentration in the salt sludge to 10 wt% or less and to form a chlorinated salt mixture containing metal chlorides, and (e) metal association from the chlorinated salt mixture Separating and removing water, and (f) continuously feeding the salt mixture to the heated type. Continuous process for the titanium or beverage can scrap scheme melting and purification. The molten salt of claim 1, wherein the molten salt comprises about 75-98% by weight of a chloride of Na, K, Mg, Al, Ca or Li and about 2-25% by weight of Na, K, Mg, Ca, Al or Said process comprising a fluoride of Li. The process of claim 1 wherein the chlorination step forms volatile metal chlorides as gas and nonvolatile metal chlorides as molten salt. 4. The process of claim 3, wherein said removing step further comprises reducing said non-volatile metal chloride by electrolytic reduction. 5. The process of claim 4, wherein said removing comprises cleaning the metal chloride gas to separate the metal chloride from the carbonaceous vapor. 6. The process according to claim 5, further comprising condensing silicon tetrachloride or titanium tetrachloride prior to said cleaning. 7. The process according to claim 6, wherein the heating chamber uses AC resistance heating and the electrolytic reduction uses DC electrodes. 8. The process of claim 7, further comprising removing the reduced metal formed by electrolytic reduction of nonvolatile metal chlorides. The process of claim 8, wherein the impurities comprise oxides of aluminum, magnesium, silicon, or titanium, and wherein the oxide concentration is controlled to about 5% by weight or less. A process for melting and recovering aluminum from an aluminum beverage can scrap, the process comprising: (a) heating a molten salt containing at least about 75 weight percent chloride salt and up to about 25 weight percent fluoride salt in a heating chamber, and (b) Mixing the heated salt with aluminum scrap in a charging chamber to form a molten charge mixture, and (c) coalescing the aluminum metal to form a molten aluminum metal pad to form the aluminum from impurities in the molten charge mixture. A portion of the loading mixture from the charging chamber by separating and (d) introducing chlorine gas and solid carbon to form a metal chloride from the chlorinated salt mixture and impurities in the scrap in an amount sufficient to control the oxide concentration. (E) removing the metal chloride to maintain a specific concentration of the metal chloride in the salt mixture. And, (f) the aluminum melt and the salt mixture from the other recovery process, an aluminum beverage can scrap including a step of heating the chamber re-circulation. The process of claim 10, wherein said specific concentration of fluoride is about 2 to about 20 weight percent. The process of claim 11, wherein said specific concentration of fluoride is about 50% to about 15% by weight. 13. The process of claim 12, wherein said removing comprises reducing metal chloride by electrolysis and thereby removing the reduced metal produced. A continuous process for melting and recovering aluminum from an aluminum beverage can scrap or scheme, comprising: (a) heating the molten salt of chloride and fluoride in a heating chamber to a temperature in the range of about 760-787.8 ° C., and (b) charging mixture Mixing the heated salt in an charging chamber with an aluminum scheme or dross, (c) separating the aluminum from impurities in the charging mixture by incorporating aluminum metal to form a molten aluminum metal pad, (d) chlorinating a portion of the charge mixture in an amount sufficient to control the oxide concentration in the charge in the presence of solid carbon to form a chlorinated salt mixture and metal chloride, and (e) about 75-98 weight percent of the specific chloride Metal chloride is removed from the salt mixture to maintain concentration, and (f) the salt mixture is continuously poured into the heating chamber. Stage continuous process for the aluminum melt, and recovery from, an aluminum beverage can scrap or scheme including a. 15. The process according to claim 14, wherein the specific chloride concentration is 85 to 95 wt% based on oxide free. The method of claim 15, wherein the salt is about 75-98 weights of NaCi, KCl, MgCl ₂ , AlCl ₃ , CaCl ₂ or LiCl and about 2-20% by weight of NaF, KF, MgF ₂ , CaF ₂ , AlF ₃ or Wherein said removing step further comprises reducing the metal chloride by electrolytic reduction to form a reduced metal, and removing the reduced metal from the salt mixture prior to feeding the salt mixture to the heating chamber. . Melting the light metal scrap and / or scheme into the molten salt such that the molten salt accumulates impurities and electrolyzing the molten salt to remove impurities from the salt. 18. The process of claim 17, wherein the impurities comprise a metal oxide, the process further comprising chlorination of the metal oxide prior to electrolysis. 18. The process of claim 17, wherein the impurities comprise a metal oxide, the metal oxide being directly electrolyzed in the electrolysis step. 19. The process of claim 18, wherein the light metal is aluminum or an aluminum-lithium alloy, the process further comprising coalescing molten aluminum from the molten salt. 20. The process of claim 19, wherein the light metal is aluminum or an aluminum-lithium alloy, and the process further comprises coalescing the molten aluminum from the molten salt. 21. The process of claim 20, wherein the light metal is an aluminum-litum alloy and the process further comprises recovering a metal comprising lithium from the electrolysis step. 22. The process of claim 21, wherein the light metal is an aluminum-lithium alloy and the process further comprises recovering a metal comprising lithium from the electrolysis step. 18. The process of claim 17, wherein the molten salt comprises about 75-98 weight percent chloride salt and about 2-25 weight fluoride salt. The process of claim 24, wherein the chloride salt fluoride salt is a salt of Na, K, Mg, Al, Ca or Li. The molten salt is melted by melting light metal scrap and / or scheme in the molten salt bath and pumping the molten salt past the heating electrode to reduce the hot spot in the molten salt which may cause fumes from the molten salt. A light metal scrap and / or scheme treatment process comprising heating. Light metal scrap and / or scheme processing comprising melting the light metal scrap and / or scheme in molten salt, wherein the light metal scrap and / or scheme is supplied to the molten salt as a consumable heating electrode to heat the molten salt. . 28. The process of claim 27, wherein the molten salt is pumped past the consumable heating electrode to reduce the hot spots that may cause smoke from the molten salt. 28. The process according to claim 27, wherein the light metal scrap and / or scheme is supplied in a dense population form. 28. The process of claim 27 wherein the light metal scrap and / or scheme is supplied in an undense form through the tube electrode. 28. The scrap heating electrode of claim 27, wherein light metal is incorporated from the molten salt into the molten metal pad and protrudes above the level of the molten metal pad to maintain thermal balance of the process regardless of the level of the molten metal pad. Providing the electrode against the process. Melt the light metal scrap and / or scheme in the molten salt, collect impurities including the oxide and carbon from the light metal scrap and / or scheme into the molten salt, and remove the carbon from the molten salt A light metal scrap and / or scheme treatment process comprising introducing an oxygen containing gas. 33. The process of claim 32, further comprising electrolyzing the molten salt to remove oxide impurities from the molten salt. 34. The process of claim 33, wherein the oxide impurities are chlorinated prior to removal by electrolysis. 33. The process of claim 32, wherein the carbon is generated from pyrolysis of the organic coating of light metal scrap. 36. The process of claim 35, wherein the organic coating is lacquer. 37. The process of claim 36, wherein light metal scrap and / scheme is a beverage can with the lacquer coating. ※ Note: The disclosure is based on the initial application.