SU915966A1 - Device for slime removal from pulps - Google Patents

Description

The invention relates to the enrichment of minerals and can be used in fine-tuning magnetite concentrates.

Known magnetic apparatus for thickening, consisting of a non-magnetic housing, a magnetic system, a supply nozzle, a drain collection box, an automatically adjustable opening for outputting a condensed product, a vertical pipe located in the center of the apparatus, and an additional magnetic system (1).

The closest to the proposed technical essence and the achieved effect is a device for desliming pulps, comprising a cylindrical housing, a magnetic system installed inside the cylindrical part of the housing, supplying, discharging and drainage fittings, washing device located in the conical part of the housing G 2].

2

A disadvantage of the known devices is the low efficiency of the process due to the capture of non-magnetic particles and thin sludge into the floccules.

The purpose of the invention is to improve the efficiency of the process of desliming due to the creation in the working area of the pulsating magnetic field.

This goal is achieved by the fact that the device is equipped with an additional magnetic system installed on the outside of the body on its cylindrical part and made 'in the form of a coil with a decreasing number of turns in the direction of movement of the pulp, and the drain nipple is located inside * the main magnetic system.

FIG. 1 shows the proposed device, a longitudinal section; in fig. 2 - the same, top view (view along arrow A in FIG. 1).

The device includes a housing 1 with a magnetic system 2 placed on its cylindrical part, made in

four

3 ' ¹ 9159 (

the form of coils with a decreasing number of turns in the direction of movement of the pulp and connected to an alternating current source, a nozzle 3 for removing the drain, around which the entire length is placed 5

a multipolar magnetic system of permanent magnets 4, supplying the nozzles 5, the flushing device 6, the nozzle 7 for unloading sands and the hermetic jacket 8. "0

The device works as follows.

Through the nozzle 5, the pulp is fed into the zone of action of the pulsating field resulting from the interaction, 5 of the constant field created by the system of permanent magnets 4 and the alternating field created by the magnetic system 2. In the pulsating field the particles are cleaned of non-magnetic material and sludge and floc formation. The flocculated particles are deposited under the action of gravitational forces on the conical part of the body, where they pass washing with an opposite flow of water coming from the flushing device 6. The particles washed out randomly trapped in the floccules along with the drain are removed along the vertical nozzle 3. At the same time, randomly capture When moving along a vertical nozzle, magnetic particles that are drained are exposed to a constant magnetic field and flocculate. Under the action of gravitational forces, the resulting floccules are deposited and unloaded along with the rest of the magnetic material through the nozzle 7.

The mutually perpendicular direction of the power lines of constant and alternating magnetic fields contributes to the effective cleaning of the resulting flocs from a nonmagnetic material due to the vibration of magnetite particles in the direction perpendicular to the moving. ₄ , the live material. This is also facilitated by the short length of flocs formed under these conditions.

o According to the flocculation conditions inside the device in the course of the movement of the material, two zones with the same length can be distinguished.

The zone of strong vibration of particles and their active cleaning from non-magnetic material and thin sludge.

The tension of the constant field (H _position) on the whole length of the zone varies in a direction perpendicular to the movement of pulp between 50 and 300 Oe, the N _cycles / N _post = 0.5-1, where _lane H - AC field intensity.

The zone of weak vibration of particles and the formation of flocs, in which cleared of non-magnetic material and sludge

particles form and precipitate.

I

The strength of the constant field here is the same with the first zone.

/ 8 _p0ST = 0.2-0.5.

Since the magnetic forces in the working space of the device are directed toward the gravitational, the movement of flocs is slowed down. This increases the exposure time of the pulsating field and increases the efficiency of cleaning flocs from non-magnetic material and sludge.

Claims (1)

Claim A device for the desliming of pulps, including a cylindrical body, a magnetic system installed inside the cylindrical part of the body, supplying, unloading and discharge nozzles, a flushing device located in the conical part of the body, characterized by the fact that, the area of the pulsating magnetic field, it is equipped with an additional magnetic system installed on the outside of the body on its cylindrical part and made in the form coils with decreasing number of turns in the direction of movement of the pulp, and the spout is located inside the main magnet system.