Abstract: The present disclosure relates to a hydrocyclone separator for size classifying solid material in liquid suspension, comprising a head part, a tapered separation part, and an apex discharge part for underflow discharge, the tapered separation part being arranged between the head part and the apex discharge part, wherein the apex discharge part has a first opening aligned and attached with the tapered separation part, and has a second opening for underflow discharge in a surface opposite to the first opening, the first opening being larger than the second opening, and an inner surface of the apex discharge part has a curvature extending from the first opening to the second opening, and wherein the apex discharge part at the second opening ends in a curvature in a tangential angle, ?, within the range of 0°<?<40° from a reference plane defined transverse to a common symmetry axis of the tapered separation part and the apex discharge part.

Abstract: The present disclosure relates to a hydrocyclone separator for size classifying solid material in liquid suspension, comprising a head part, a tapered separation part, and an apex discharge part for underflow discharge, the tapered separation part being arranged between the head part and the apex discharge part, wherein the apex discharge part has a first opening aligned and attached with the tapered separation part, and has a second opening for underflow discharge in a surface opposite to the first opening, the first opening being larger than the second opening, and an inner surface of the apex discharge part has a curvature extending from the first opening to the second opening, and wherein the apex discharge part at the second opening ends in a curvature in a tangential angle, ?, within the range of 0°<?<40° from a reference plane defined transverse to a common symmetry axis of the tapered separation part and the apex discharge part.