US2012017726A1PendingUtilityA1

Use of a tertiary salt flux of nacl, kci and mgcl2 for the purification of aluminium or aluminium alloys, and method thereof

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Assignee: TREMBLAY SYLVAINPriority: Jun 8, 2009Filed: Jul 28, 2011Published: Jan 26, 2012
Est. expiryJun 8, 2029(~2.9 yrs left)· nominal 20-yr term from priority
Inventors:Sylvain TremblayLuc DesrosiersDaniel Wayne Levesque, Jr.
C22B 9/103C22B 21/062C22B 9/10
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Claims

Abstract

A method for the purification of a metal selected from the group consisting of aluminum and aluminum alloys, wherein said metal is in a liquid phase and is contacted with a salt flux consisting of a selected tertiary mixture of NaCl, KCl, and MgCl 2 .

Claims

exact text as granted — not AI-modified
1 . A method for the purification of a metal selected from the group consisting of aluminum and aluminum alloys, wherein said method comprises:
 heating the metal to a liquid phase; and   contacting the liquid metal with a salt flux consisting of a tertiary mixture of NaCl, KCl, and MgCl 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 NaCl; 
 salt fluxes in the form of particles obtained by grinding a fused salt of NaCl, KCl and MgCl 2  and having the following formulations:
 5-18% by weight of NaCl, 
 17-60% by weight of KCl, 
 35-65% by weight of MgCl 2 ; 
 
 salt fluxes in the form of particles obtained by grinding a fused salt of NaCl, KCl and MgCl 2  and having the following formulations:
 more than 22 to 55% by weight of NaCl, 
 13-43% by weight of KCl, 
 35-65% by weight of MgCl 2 ; and 
 
 salt fluxes in the form of a liquid tertiary mixture. 
 
     
     
         2 . The method of  claim 1 , wherein said salt flux is a ternary mixture of particles of NaCl, KCl, and MgCl 2 , wherein more than 22% by weight of said tertiary mixture consists of NaCl. 
     
     
         3 . The method of  claim 2 , wherein particles have an average particle size comprised between 100 μm and 3.35 mm. 
     
     
         4 . The method of  claim 2 , wherein said particles have an average size particle comprised between 0.85 mm and 3.15 mm. 
     
     
         5 . The method of  claim 2 , wherein said particles have an average particle size comprised between 100 μm and 1 mm. 
     
     
         6 . The method of  claim 2 , wherein said particles are contacted with the liquid metal by injection with a gas injection equipment. 
     
     
         7 . The method of  claim 2 , wherein said tertiary mixture comprises:
 a) from more than 22 to 30% by weight of NaCl,   b) from 5 to 43% by weight of KCl, and   c) from 35 to 65% by weight of MgCl 2 .   
     
     
         8 . The method of  claim 2 , wherein said tertiary mixture comprises:
 a) 25% by weight of NaCl,   b) 15% by weight of KCl, and   c) 60% by weight of particles of MgCl 2 ;   
       said tertiary mixture having a melting point of about 417° C. 
     
     
         9 . The method of  claim 8 , wherein particles have an average particle size comprised between 100 μm and 3.35 mm. 
     
     
         10 . The method of  claim 8 , wherein said particles have an average size particle between 0.85 mm and 3.15 mm. 
     
     
         11 . The method of  claim 8 , wherein said particles have an average particle size between 100 μm and 1 mm. 
     
     
         12 . The method of  claim 8 , wherein said particles are contacted with the liquid metal by injection with a gas injection equipment. 
     
     
         13 . The method of  claim 1 , wherein said salt flux is in the form of particles obtained by grinding a fused salt of NaCl, KCl and MgCl 2  having the following formulations:
 5-18% by weight of NaCl,   17-60% by weight of KCl,   35-65% by weight of MgCl 2 .   
     
     
         14 . The method of  claim 13 , wherein said particles have an average particle size between 100 μm and 3.35 mm. 
     
     
         15 . The method of  claim 13 , wherein said particles have an average size particle between 0.85 mm and 3.15 mm. 
     
     
         16 . The method of  claim 13 , wherein said particles have an average particle size between 100 μm and 1 mm. 
     
     
         17 . The method of  claim 13 , wherein said particles are contacted with the liquid metal by injection with a gas injection equipment. 
     
     
         18 . The method of  claim 1 , wherein said salt flux is in the form of particles obtained by grinding a fused salt of NaCl, KCl and MgCl 2  having the following formulations:
 more than 22 to 55% by weight of NaCl,   13-43% by weight of KCl,   35-65% by weight of MgCl 2 .   
     
     
         19 . The method of  claim 18 , wherein said particles have an average particle size between 100 μm and 3.35 mm. 
     
     
         20 . The method of  claim 18 , wherein said particles have an average size particle between 0.85 mm and 3.15 mm. 
     
     
         21 . The method of  claim 18 , wherein said particles have an average particle size between 100 μm and 1 mm. 
     
     
         22 . The method of  claim 18 , wherein said particles are contacted with the liquid metal by injection with a gas injection equipment. 
     
     
         23 . The method according to  claim 18 , wherein said tertiary mixture comprises:
 a) 25% by weight of NaCl,   b) 15% by weight of KCl, and   c) 60% by weight of MgCl 2 ;   
       said tertiary mixture having a melting point of about 417° C. 
     
     
         24 . The method of  claim 23 , wherein said particles have an average particle size between 100 μm and 3.35 mm. 
     
     
         25 . The method of  claim 23 , wherein said particles have an average size particle between 0.85 mm and 3.15 mm. 
     
     
         26 . The method of  claim 23 , wherein said particles have an average particle size between 100 μm and 1 mm. 
     
     
         27 . The method of  claim 23 , wherein said particles are contacted with the liquid metal by injection with a gas injection equipment. 
     
     
         28 . The method of  claim 1 , wherein said salt flux is a liquid tertiary mixture of NaCl, KCl, and MgCl 2 . 
     
     
         29 . The method of  claim 28 , wherein said liquid tertiary mixture comprises:
 a) from 10 to 35% by weight of NaCl,   b) from 5 to 45% by weight of KCl, and   c) from 40 to 65% by weight of MgCl 2 .   
     
     
         30 . The method according to  claim 28 , wherein more than 22% by weight of said liquid tertiary mixture consists of NaCl. 
     
     
         31 . The method according to  claim 28 , wherein said liquid tertiary mixture comprises:
 a) from more than 22 to 35% by weight of NaCl,   b) from 5 to 38% by weight of KCl, and   c) from 40 to 65% by weight of MgCl 2 .   
     
     
         32 . The method according to  claim 28 , wherein said tertiary mixture comprises:
 a) 25% by weight of NaCl,   b) 15% by weight of KCl, and   c) 60% by weight of MgCl 2 .   
     
     
         33 . The method according to  claim 1 , wherein the metal is an aluminum alloy having a magnesium content higher than 3% by weight. 
     
     
         34 . The method according to  claim 2 , wherein the metal is an aluminum alloy having a magnesium content higher than 3% by weight. 
     
     
         35 . The method according to  claim 13 , wherein the metal is an aluminum alloy having a magnesium content higher than 3% by weight. 
     
     
         36 . The method according to  claim 18 , wherein the metal is an aluminum alloy having a magnesium content higher than 3% by weight. 
     
     
         37 . The method according to  claim 28 , wherein the metal is an aluminum alloy having a magnesium content higher than 3% by weight. 
     
     
         38 . The method according to  claim 1 , wherein the metal is an aluminum alloy having a silicon content higher than 10% by weight. 
     
     
         39 . The method according to  claim 2 , wherein the metal is an aluminum alloy having a silicon content higher than 10% by weight. 
     
     
         40 . The method according to  claim 13 , wherein the metal is an aluminum alloy having a silicon content higher than 10% by weight. 
     
     
         41 . The method according to  claim 18 , wherein the metal is an aluminum alloy having a silicon content higher than 10% by weight. 
     
     
         42 . The method according to  claim 28 , wherein the metal is an aluminum alloy having a silicon content higher than 10% by weight.

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