Submerged Spiral Classifier. Introduction. Classification equipment---the spiral of overflow end is completely immersed below liquid level. Capacity. 501410 t/d. Product improvement. An automatic elevating apparatus is added to the discharge opening. The scoop in ball mill is eliminated bringing more stable operation. The spiral chute mainly uses the inertial centrifugal force generated by the minerals of different densities in the spiral rotation to achieve the separation of light and heavy minerals. Because of its simple equipment structure, low power consumption, and large processing capacity, it is widely used in the gravity separation process.