SU831203A1 - Plant for classificating - Google Patents

Description

(54) INSTALLATION FOR CLASSIFICATION

one

The invention relates to equipment used in alumina production.

Known hydroharmonic, including a box with a sieve. The sieve is fixed rigidly on the box, with which it is immersed in a water bath, which in turn has a drain threshold to maintain a constant level of flooding of sieves and a discharge funnel for taking the sifted material out of the bath. On top of the sieve are loading devices for feeding classified solid material and water. Directional vibration oscillations are communicated to the sieve through the duct and shock absorbers, through which it is posted on the frame, from two vibratory actuators.

In this hydrocircuit, the classified material is first loaded into the solution, and then with the help of directional oscillations, large fractions not passing through the sieve are carried to the surface, where they are washed with water and unloaded from the sieve as wetted particles discharge hopper with water i.

The disadvantage of this hydroharmonic is the lack of elements that provide

rapid withdrawal of fines and increased contact time of coarse material with the processing liquid.

A known installation for classification, comprising a frame, a housing with a sieve, spring-loaded into the bath, a vibrodrive, a loading and unloading funnel for the fine and coarse fraction 2.

The disadvantage of this setup is the inability to combine the operations of classification and leaching of specs.

The purpose of the invention is to reduce leaching costs by combining the operation of classification and leaching when processing alumina-containing cakes.

This goal is achieved by the fact that the installation is equipped with a tray mounted with a slope of 1-5 ° in the direction of the discharge funnel for fines.

In addition TOGOTlot installed under the sieve or in front of the sieve and is equipped with an additional vibration drive. At the same time the working surfaces of the tray and the sieve have thresholds.

Claims (1)

FIG. I depicts a setup for classification, a general view; in fig. 2 — installation with independent vibration drives for a tray and a sieve; in fig. 3 - installation, in which thresholds are established on the working surfaces of the tray and the sieve. The apparatus for classification includes a frame 1, which is a supporting base, a vibrating box 2, with a sieve 3 rigidly fixed on it and a tray 4, which are immersed in a bath 5. The bath at one end has a drain threshold passing into the receiving mortar 6, on the other hand, there is an unloading sand funnel 7. On top, the installation is equipped with a feed funnel 8 with a feeder 9 for feeding the cake, a damping device 10, and a vibrodrive 11 mounted on the box. To receive directional elastic oscillations rah 12. Under the discharge end of the sieve, yield FQDN of the bathrooms to the surface, is set for receiving chute 13 schlama major fractions. In the case of the version with separate tray and sieve, the installation has a box 14, integral with tray 4, but separate from box 2, and an independent vibration drive 15. The suspension of box 14 is carried out on self-contained shock absorbers 12. In addition, working surfaces are installed perpendicular to the direction of movement of the sinter thresholds 16. The installation for classification works as follows. Polydisperse crushed sintered grain size, approximately, 8 mm, served with the power of the feeder 9 and the hopper 8 to the sieve 3 from the side of its greatest immersion. The solution is introduced through the device 1, device 10 to the opposite discharge end of the sieve. The sinter particles on the sieve undergo intensive hydro-vibro-processing in an alkaline-aluminate solution in a vibro-slime mode. As a result, speck leaching occurs — complete for the small fractions, which are immediately sieved through a sieve, and partial for the large fractions. Classified into slots under the influence of directional vibrations is unloaded from the sieve. The coarse fractions (the oversize product) are moved upward through the sieve, first in a strong solution, then on the surface and, before unloading, into the drain 13, are rinsed with a fresh, less concentrated solution fed to the vibroleaching. The fine fractions (sub-product), which fall into tray 4, are transported to a sand-bottom 50, from which they are continuously mixed together with the aluminate solution and then sent to separation in hydrocyclones. The constant level in the bath, corresponding to the height of the overflow threshold, is maintained automatically by adjusting the flow rate of the sands during discharge from the funnel 7. The flow regulation is such that its main part is discharged through the sand funnel, thereby preventing sludge accumulation. The immersion depth and tilt angle of the vibrating screen allowing the performance and time of contact of the cake with the solution to vary during operation are adjusted with noMonin t of shock absorbers 12. To reduce the residence time of small fractions in the bath, tray 4 is set with a slope of 1-5 ° to the side discharge funnel. The small particles that have passed through the sieve 3 fall on the vibrating inclined surface of the tray and, under the influence of directional vibrations, are quickly transported to the sand funnel 7 opposite the discharge opening. In the case of a variant with separate placement of the tray and sieve, the installation works in the following manner. Polydispersed crushed frit particle size of about 8 mm is applied to a vibrating tray 14 via feeder 9. The solution is introduced to the shaker 3 by the discharge otklassifitsirovannyh large fractions through duschiruyuschee device 10. At the vibrating tray frit undergoes intensive gidrovibroobrabotke in alkali aluminate solution vibrokipeni mode . The exit to the surface, the cake from the tray is transferred to the sieve 3, where leaching ends, and at the same time the sludge is classified. Moreover, the pa3rviep of holes in the sieve is selected such that the slime is classified only according to the class of grains. leached completely (less than 1 mm). The classified coarse fractions (from 8 to 1 mm) under the influence of directional oscillations move upwards through the sieve, unloading into the chute 13. In the upper part of the sieve, before discharge, it is washed with a fresh less concentrated solution, which is leached to them. The fine sifted fractions fall into the discharge sand funnel 7, from where they continuously flow together with the aluminate solution into hydrocyclone separation. A further increase in the contact time of the coarse material with the liquid can also be achieved by accumulating a layer of greater height on the vibrating tray and sieve. The thresholds 16 are set on the working surfaces of tray 4 and sieve 3. The proposed installation allows combining the operations of classification and leaching of alumina-containing specs. . Claim 1. Installation for classification, comprising a frame, a housing with a sieve, immersed in a bath, a vibrodrive, loading and unloading funnels for the fine and coarse fraction, characterized in that