In mineral processing process, classification is an important part of the preparation process, classification work, and the results will affect the subsequent work of concentrator.Spiral classifier as a kind of classification equipment, is widely used in the concentrator. However, do you know the development history of spiral calssifier?

The development history of spiral calssifier is as follows:

From study out of the first grading machine, classifier with the development of the society to keep pace with The Times.Later, spiral classifier gradually replaced the old classifier, become the market to be bestowed favor on newly.Traditional spiral classifier classification efficiency is generally low, between 35% ~ 50%, some even less than 30%, and the classification efficiency is too low will directly cause cyclic load increases, reducing mill processing capabilities, mineral crushing serious, worsening operation, reduce the metal recovery, the sand inclusion has a large number of qualified grade.In order to overcome the shortcoming of traditional spiral classifier, beneficiation technology workers at home and abroad to do a lot of research work, such as changing the speed of the screw, the change of pitch of varying pitch, such as in the sand conveying section adding flushing water pulp flow and so on.Although these measures to a certain extent changed the spiral classifier classification effect, but in general, the classification efficiency are not substantial.

Humans, however, the pace of innovation will not stop, a series of new type, high efficiency, energy saving of the spiral classifier is popular in the line of sight.Much new period of conical spiral classifier, the larger change traditional screw machine structure, with conical spiral and taper surface shape of tub structure, constitute a multiple classifying chamber, produce multiple classification, can undertake multiple classification, raise the efficiency of classification.Composite round sieve spiral classifier, use the upper space of the original spiral classifier, it into the spiral screen inside, according to a new type of composite classification technology of solid particles in the requirements under the condition of the granularity of the separation, significantly reduces the effect of ore crushing, improve the ore dressing recovery rate.Magnetic spiral classifier, it is mainly by using the water particles in a gravitational field of the settlement for grading, above the class to add a magnetic system, make the magnetic mineral grains received two force field, the particles in strict accordance with the particle size grading, improve the classification efficiency, increase the ability of the mill.

Hierachial sieving machine is in the rear of the original spiral classifier (http://www.chinaquarry.com/products_show/pro30.html) has increased a synchronization with spiral vane rotating cylindrical sieve and matched with the water pipe, on the feeder and screen.Inside the sieve, equipped with internal screw blade, tub at the back of the modified into undersize chute, used to access the undersize.Hierachial sieving machine will interfere in sedimentation classification principle and sieving classification theory organically, to strengthen the degree of sizing, effectively improve the classification efficiency.

The development history of spiral calssifier: http://www.chinaquarry.com/products_show/pro30.html