The spiral classifier is a kind of equipment using the principle of different proportion of solid particles and different precipitated in liquid velocity to carry out a classification of mechanical processing. It is mainly used for grinding circuit pre-grading and inspection grading and washing work. Its main advantage is simple structure, reliable, easy to operate and mainly used for the grinding machine with the diameter less than 3.6m in the closed mechanism constituted.
According to different axis, the spiral classifier is divided into the single and double spiral classifier, and according to weir height can be divided into the high weir type and low weir and sinking. The high weir classifier is generally used for coarse grading, grading overflow its size limit is greater than 0.15mm. Sinking classifier is generally used fine grading, grading overflow size limit is less than 0.15mm. The low weir classifier usually does not use for classify work but mainly for ore sand mud washing off.