Learn more about mineral processing!

In the beneficiation process, the classification operation often plays an extremely important role in the grinding cycle. It is necessary to fully dissociate and separate the fine-disseminated useful minerals and gangue, and grind the ore to a certain degree of fineness, but it is also essential to avoid over-grinding to prevent muddy from adversely affecting the separating process. This requires classifying equipment to separate the qualified parts of the grinding products in time to avoid unnecessary grinding, deliver the product to the sorting operation earlier and return the part with unqualified particle size to the mill for re-grinding. It can be seen that the classification operation is of great significance to the grinding cycle in both technical and economic sense. Generally, the classifying equipment performs the classifying operation by the force and principle such as gravity, centrifugal force, and mechanical vibration. At present, the classification equipment used i...

In mineral processing, the ores need to be grinded into a certain size that the fine-grained useful minerals and gangue minerals achieve full dissociation. And the over-grinding should be avoided at the same time in case that the sliming has the negative effect on the separation, which need the classifier to return the unqualified particles to the grinding mill for re-grinding, and separate the qualified particles in time.Therefore, classification takes an important part in grinding operation in the view of technology and economy aspect. Now, the common classifiers in mineral processing plant are mainly mechanical classifier and  hydrocyclone . Among them,mechanical classifier can be divided into spiral classifier, rake classifier,tank classifier and other types. With the development of classification operation, rake classifier is already replaced by spiral classifier, tank classifier is gradually replaced by hydrocyclone. Although the rapid development of hydrocyclone make the ...

The   spiral classifier   is one of the important mineral processing equipment, whose working principle is to classify the materials by using the difference in the settling speed of solid particles in the liquid. The classifying effect of the spiral classifier will directly affect the content of the qualified product in the returned sand, thus affecting the grinding efficiency of the   grinding mill . In the classifying process, the factors that affect the classifying effect of the spiral classifier mainly include the following three aspects: the feeding of the spiral classifier, the structure of the spiral classifier and the operation mode of the spiral classifier. Below, we will specifically analyze how these three factors affect the classifying effect of spiral classifier. 1. The feeding of the spiral classifier There are mainly two factors that affect the classifying effect of the spiral classifier in the aspect of feeding, one is the mud content of feedi...

Hydrocyclone   is an effective separation device that carries on two-phase fluid separation by using the centrifugal force field. It is a non-motion separation device composed of the upper cylinder and the lower cone. When the pulp is shot in the cylinder through the feeding tube in a tangent, involute or spiral way, the mixture of medium and particles produces the centrifugal field caused by rotating, the particles (or liquid phase) with different density produce the different trajectories. Under the action of centrifugal force, medium resistance and force field, the coarse particles and heavy particles moving towards the periphery, and are discharged from the spigot through the cone-shaped body; the fine particles and low-density particles (or liquid phase) move toward the center and are discharged by the overflow pipe, finally the classification of solid particles and the separation of fluids with different densities are realized. In the ore dressing, hydrocyclone is main...

Both   spiral classifier   and   hydrocyclone   are mineral classifier. Ordinarily, the mineral classifier could be defined into four types: water-lifting hydraulic classifier, cone classifier, centrifugal classifier (hydrocyclone), mechanical classifier(rake classifier, spiral classifier, flotation tank classifier). Why we talk about spiral classifier and hydrocyclone here is that they are the main classifiers of the processing plant in our country. So here we would compare the two of them elaborately. Spiral classifier is one of the mechanical classifiers. It consists with U-verse tank, spiral device, transmission device, lifting gear and supporting bearing. The working principle of classifier is following: the slurry after grinding was sent to the U-verse tank from the feeding port. Through the rotation and agitation of the spiral device, light and small granules float on the surface, and overflow from the downflow weir. Thick and heavy granules sink to the...