Machine for forming metal bars

Abstract

A machine for forming metal bars, in particular for producing ingots made of precious metal such as gold, silver, precious alloys, as well as other pure metals or different alloys, including a melting station for melting the metal contained in an ingot mould, wherein the ingot mould contains an accurate amount of metal, in the form of powder, grits or swarf of various sizes and a chemical additive, which creates a chemical reaction with the impurities contained in the metal. The chemical additive may be any of boric acid, borax, potassium nitrates, ammonium, sodium, lithium and potassium and sodium chlorides.

1 . A machine for forming metal bars, in particular for producing ingots made of precious metal such as gold, silver, precious alloys, as well as other pure metals or different alloys, comprising a melting station for melting the metal contained in at least one ingot mould which includes a cover, wherein said at least one ingot mould comprises an accurate amount of metal, in the form of powder, grits or swarf of various sizes and a chemical additive, which creates a chemical reaction with impurities contained in the metal wherein said chemical additive is selected from the group consisting of boric acid, borax, potassium nitrates, ammonium, sodium, lithium and potassium and sodium chlorides, and combinations thereof. 
     
     
         2 . The machine according to  claim 1 , wherein said melting station comprises at least one melting furnace in which one or more ingot moulds containing said metal and said chemical additive are pushed. 
     
     
         3 . The machine according to  claim 1 , comprising a station of secondary addition said station of secondary addition adding an accurate amount of a second chemical additive in each ingot mould, on the molten metal, said accurate amount of said second chemical additive creating a chemical reaction with the impurities contained in said molten metal, said second chemical additive being selected from the group consisting of boric acid, borax, potassium nitrates, ammonium, sodium, lithium and potassium and sodium chlorides, and combinations thereof. 
     
     
         4 . The machine according to  claim 3 , wherein said station of secondary addition comprises dosing systems that add said second chemical additive on the still liquid metal contained in each ingot mold. 
     
     
         5 . The machine according to  claim 3 , wherein said station of secondary addition comprises grippers that raise the cover of each ingot mould. 
     
     
         6 . The machine according to  claim 3 , wherein said station of secondary addition is incorporated in a single station which also comprises a solidification station. 
     
     
         7 . The machine according to  claim 3 , wherein said station of secondary addition comprises an inert environment which comprises inert gas which prevents the oxidation of said ingot moulds and said covers and protects the metal still in liquid form against oxygen. 
     
     
         8 . The machine according to  claim 7 , wherein said inert gas is nitrogen, argon, or nitrogen-hydrogen mixture.