SU1184564A1 - Spiral classifier - Google Patents

Description

The invention relates to the field of hydraulic classification of granular materials and can be used in the mining, metallurgical, chemical and other industries 5 industries.

The purpose of the invention is to reduce the mutual contamination of the products obtained by increasing the efficiency of the separation of large particles from the drain.

Fig, 1 shows a spiral classifier, front view; 2 a top view; in fig. 3 shows section A-A in FIG. 2

The classifier consists of a trough-shaped housing 1, resting on an inclined frame 2. Inside the housing I, spirals 3 are mounted, mounted on shafts 4, rotating from drive 5.

On the side wall of the housing 1 is installed - 0 0 a loading device · 6, to which the supply pipe 7 is tangentially attached, to the lower end of the housing 1 is attached a casing 8, inside of which there are packages of plates 9 mounted on the transverse wall 10 with shaped holes . The casing 8 ends at the top of the drain threshold 11. On the outer side of the casing is the receiving About the chute 12. Above each channel, the plates 9 are installed with the possibility of vertical movement of the bar 13.

Spiral classifier works as follows. 35

The original slurry through the supply line 7 enters through the loading device 6 into the body of the spiral classifier.

In the boot device, a partial flow rate quenching occurs. The largest particles of solid materials are deposited in the housing 1 of the spiral classifier. Partially clarified slurry containing relatively small particles in it through figured holes in the transverse wall 10 enters the gaps between the inclined plates 9, where solid particles settle on the inclined surfaces of the plates and form into a thin wall layer, which gravity gradually creeps back into the body of the spiral classifier. The clarified water, together with solid particles, the size of which is smaller than the boundary separation grain, through

The drain threshold enters the receiving chute 12. Particles deposited in the body together with a thin wall layer that slides off the inclined plates are transported by spirals 3, dehydrated in the surface part and unloaded through the upper bottom of the housing 1 of the spiral classifier.

A change in the mode of operation of the spiral classifier (change in the size of the boundary separation grain ά _Π ρ of a solid component) is achieved by means of adjusting strips 13, which, when moved vertically, block water draining from one or several packages of inclined plates, and thereby by increasing the velocity of the slurry through the gap between the plates in the remaining packages leads to an increase in the boundary grain separation of the granular material.

Placing the plates parallel to the casing walls leads to the most complete use of the classifier volume.

The plates are equidistantI

with these upper edges of the drain threshold level and the lower ones from the classifier spirals, contributes to the formation of steady flows of drain and sand separated from the drain, preventing their mixing.

The implementation of the gap between the plates is proportional to their length is necessary to stabilize the speed of the slurry in the gaps between the inclined plates. Making the gap between the plates equal to 0.02-0.06 of their length is the most optimal in terms of the classification of granular materials at normal pulp densities. Increasing the gap between the plates above 0.06 of their length leads to pulpation turbulence and causes a violation of the classification process, reducing the gap between the plates less than 0.02 of their length slows down the ascending pulp flows by increasing the hydraulic resistance and closing the gap with the settled layer large particles and also causes a violation of the classification process.

The use of a hydraulic classifier allows for a reduction of

1184564

four

increase the yield of coarse particles with a drain to improve the quality of the separated products and reduce the losses of the separated fractions.

FIG. 3

Claims (2)

SPIRAL CLASSIFICATOR, including body, spirals, drive, boot device, casing with drain threshold, characterized in that, in order to reduce inter-contamination of the separated products by increasing the efficiency of separation from the discharge of large particles, the classifier is equipped with a package of plates installed in parallel the casing walls, while the upper edges of the plates are equidistant from the level of the drain threshold, and the lower - from the spirals, and the distance between the inclined plates are 0.02-0.06 of their length. one 1 184564 2