Arrangement for feeding fine-grained matter to a concentrate or matte burner of a suspension smelting furnace

An arrangement for feeding fine-grained matter to a concentrate or matte burner of a suspension smelting furnace, wherein the arrangement includes a screw conveyor comprising

• a tube means having a circumferential inner surface,
• an inlet opening for feeding fine-grained matter into the tube means,
• a downward-facing outlet opening in the circumferential inner surface of the tube means for discharging fine-grained matter from the tube means, and
• a helical screw arranged around a shaft for moving fine-grained matter in the tube means from the inlet opening to the downward-facing outlet opening by rotating the helical screw,
• characterized
• by the downward-facing outlet opening of the tube means of the screw conveyor being provided with a distribution means
• where the distribution means (a) has free end configured for feeding fine-grained matter into the downward-facing outlet opening,
• (b) extends from a direction of the inlet opening into the downward-facing outlet opening in at least one of a slanted and curved configuration;
• (c) is forward open and is cross-section curved so that the distribution means has in cross-section a radius of curvature essentially corresponding to a radius of a circumferential inner surface of the tube means;
• and
• (d) forms an extension of the circumferential inner surface of the tube means of the screw conveyor, and further characterized
• by the helical screw of the screw conveyor extending from the direction of the inlet opening at least partly over the downward-facing outlet opening.