Multi-component flux
A solid metal flux comprised of compacted granules including (a) alkali chloride salt, (b) alkaline earth chloride salt and (c) at least one nitrate, carbonate, or sulfate salt and/or a fluoride containing salt.
1 . A method for the treatment of a metal bath comprising forming a fused binary salt of at least alkali chloride salt and alkaline earth chloride salt and obtaining the fines thereof, combining the fines with at least one nitrate, carbonate, sulfate salt, or fluoride containing salt to form a mixture, wherein the mixture is fused, compacted, crushed and sieved to form granules, and supplying the granules to the metal bath.
2 . The method of claim 1 wherein the mixture is comprised of between 25 and 75 wt. % alkali chloride salt, between 5 and 60 wt. % alkaline-earth chloride salt, between 5 and 25 wt. % fluoride containing salt, and between 5 and 25 wt. % of a nitrate, carbonate, or sulfate salt.
3 . The method of claim 1 wherein the mixture is comprised of between 30 and 75 wt. % alkali chloride salt, between 20 and 60 wt. % alkaline-earth chloride salt, between 5 and 25 wt. % fluoride containing salt, and between 8 and 18 wt. % of a nitrate, carbonate, or sulfate salt.
4 . The method of claim 1 wherein the alkali chloride salt comprises the largest percentage of the mixture by weight.
5 . The method of claim 1 wherein the alkaline-earth chloride salt comprises the largest percentage of the mixture by weight.
6 . The method of claim 1 wherein the mixture has a melting temperature of between 420 and 800° C.
7 . The method of claim 1 wherein the granules have a size between about 1 and 3 mm.
8 . The method of claim 1 wherein the granules have a density between about 1.5 and 2.0 g/cm 3 .
9 . The method of claim 1 wherein the mixture includes the fluoride containing salt.
10 . The method of claim 1 wherein the mixture includes at least one nitrate, carbonate or sulfate salt and a fluoride containing salt.
11 . The method of claim 1 wherein the metal bath is comprised of molten aluminum.
12 . A method for the treatment of a metal bath comprising forming a fused binary salt of at least alkali chloride salt and alkaline earth chloride salt and obtaining the fines thereof, combining the fines with at least one nitrate, carbonate, sulfate salt, or fluoride containing salt to form a mixture, wherein the mixture is fused, crushed and sieved to form granules having a size between about 1 and 3 mm, and supplying the granules to the metal bath.
13 . A method for the treatment of a metal bath comprising forming a fused binary salt of at least alkali chloride salt and alkaline earth chloride salt and obtaining the fines thereof, combining the fines with at least one nitrate, carbonate, sulfate salt, or fluoride containing salt to form a mixture, wherein the mixture is fused, crushed and sieved to form granules having a density between about 1.5 and 2.0 g/cm 3 , and supplying the granules to the metal bath.