A cleaning apparatus for cleaning a smelt spout of a boiler is provided.
The emptying may be started while smelt is still flowing in smelt spouts.
The pour spout is heated by the lead bath, and, preferably, a small gap is maintained between the pouring spout and a weir on the mold cavity to prevent stringers from being attached to the cast piece.
A smelt spout for a chemical recovery furnace comprises a trough of U-shaped profile fabricated as a casting in a nickel-chromium alloy containing a minor amount of niobium.
The cleaning blades each engage the respective side walls of the smelt spout to dislodge hardened smelt deposits therefrom when in the cleaning blades are in the second position.
The holding furnace (2) is lifted, and a steady flow amount of melt (M) is supplied to a casting machine casting trough (5) via the casting trough (4).