The coarse aggregate grinding line of 800mm pitch is the easiest to cause disposition.As for the 1500mm spiral separator, the disposition width is greater with the increasing mineral weight; as for the same distribution width, the grade of concentrate is increased by the addition of pitch. It is suggested that replacing the 1500mm with 900mm to optimize the coarse aggregate grinding line process. SBM as a 35 years of mineral processing solutions and coarse aggregate grinding processing lines provider, always to support your success by reliable product and good service. We supply industry use gravity spiral separator and laboratory small spiral separator all around the world, spiral separator design is available.