The invention relates to a melt launder ( 1, 9, 10 ) comprising a bottom and edged, said melt launder being particularly meant to be used for tapping a molten phase, such as slag, from a smelting furnace, which melt launder is manufactured of copper or copper alloy and provided with cooling channels ( 8 ), so that at the bottom ( 2 ) of the melt launder ( 1, 9, 10 ), there is arranged at least one groove ( 3 ).
1. A melt launder for tapping a molten phase from a smelting furnace, the melt launder comprising:
a bottom portion and edge portions, made of copper or copper alloy, for contacting the molten phase, the edge portions being provided with cooling channels situated in a lengthwise direction of the melt launder, above a level the molten phase reaches during use, the bottom portion of the melt launder having at least one groove adapted to hold a fire-resistant material that contacts the molten phase during use.
2. A melt launder according to claim 1 , wherein the bottom portion has at least one lengthwise groove and at least one transverse groove extending a width of the melt launder.
3. A melt launder according to claim 1 , further comprising a fire-resistant material situated in the at least one groove.
4. A melt launder according to claim 3 , wherein the fire-resistant material is a material that is capable of being autogenously replaced by solidified melt.
5. A melt launder according to claim 1 , wherein the at least one groove is 5-25 mm deep and 5-25 mm wide.
6. A melt launder according to claim 1 , wherein a plurality of grooves are provided, each groove being separated from an adjacent groove by a distance of 5-25 mm.
7. A melt launder according to claim 1 , wherein the at least one groove is located a distance of at least 30 mm from a lowermost cooling channel.
8. A melt launder according to claim 1 , wherein the bottom portion and edge portions of the melt launder are manufactured from a single bent copper element.
9. A melt launder according to claim 1 , wherein the bottom portion and edge portions of the melt launder are manufactured from two straight copper plates, which are worked into a substantially V-shape.
10. A melt launder according to claim 1 , wherein the bottom portion and edge portions of the melt launder consist of separate parts.