SU1727915A1 - Rotary bucket dressing and dewatering machine - Google Patents

Abstract

Usage: mineral processing. The invention: on the rotor (P) 2 buckets (K) 3 are rigidly fixed. Discharge chutes (G) 4 are coupled to the discharge ends K 3. Discharge relief devices are connected to the short circuit. The device also includes a device for loading the material in the form of a hopper 1 and a device for unloading sands in the form of a receiving hopper 8 with a conveyor 9. One or more transverse slots 5 are made at the bottom of each Ж 4. The edges of the slots 5 can be bent inward P 2. Under the slit 5, trays 6 can be installed with 6 slotted holes in the side or end walls of the trays. The water-ground mixture is fed into the bunker 1. The settled particles settle down and are scooped up by K 3 as P 2 rotates. As K 3 moves upwards, the heavy particles settle, and the non-product fractions with liquid flow into W 4. Then the light particles with liquid are discharged through the slots 5 into the hopper 7. Heavy material is dumped from K 3 into the hopper 8 and onto the conveyor 9. To reduce the loss of heavy particles, trays 6 are installed under slot 5. 3 Il, 2 ° C. f-ly.

Description

The invention relates to the enrichment and dehydration of minerals in hydromechanized mining, processing and unloading or hydraulic enrichment before storage in a dry warehouse. In particular, it can be used for enrichment and dewatering of riecKa in the technological process of mobile mining of nonmetallic building materials, before being loaded on transport ships, at dam and dam alluvium.

A rotary bucket sand and gravel decontaminant is known, consisting of a bunker and a rotary wheel, rotated by a drive in supports mounted above the slurry level (slurry) in the bunker. On

buckets are fixed to the rotor wheel, which scoop up (as the rotor rotates) from the hopper, particles and pulp that have settled to the bottom. During the rotation of the bucket to the place of discharge from it flows out of water through the perforations in the filter element located inside the bucket 1.

The disadvantages of this design are significant losses of sand from the buckets with water removed through the perforations, which leads to a decrease in the productivity of the dehydrator and an increase in the specific energy consumption. In the process of filtering water on the upper layer of settled commodity particles (larger or heavier than non-commodity

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non-coarse particles are filtered out and the desired enrichment depth is not achieved with this dewatering. It is also impossible to increase the frequency of rotation of the rotor in order to increase the efficiency of the installation or change the size of the enriched material, as this leads to an increase in the moisture content of the dehydrated material. The moisture content of commodity particles also increases significantly with the dehydration of fine minerals due to a sharp decrease in the filtration rate of water in them.

A rotary bucket dewatering tank is known, consisting of a hopper and a rotary wheel with buckets fixed on it. It also uses a filtration method of dehydration. To increase the dewatering depth, a casing is installed over the upper part of the rotor wheel, under which air is supplied with overpressure during operation. In this construction, additional energy is expended on dewatering the material, but this does not exclude the above-noted filtering of non-product fractions on the surface of the sediment of commodity 2.

In other installations, to increase the filtration rate and more completely remove water, vacuum devices of various designs are proposed, using which considerable energy is consumed and clogging of commodity fractions is not eliminated.

Closest to the proposed technical entity is a rotary installation for the separation of solid particles by particle size or specific gravity in a liquid medium, in particular for the enrichment of various types of ores and coal. The rotational installation consists of a storage bin of a commercial product, a rotary wheel, rotated by a drive in supports fixed to the storage bin, and a feeder bunker. located above the rotor wheel, pumping unit for water supply, two supply and one outlet conveyors. A mixture of water and, for example, ore concentrate is fed into the feed hopper and is poured out of it through the loading device in the tank (ladle) of the rotary wheel rotated by the driven wheel. During the time allotted to rotate the rotor at an angle approximately equal to 90 °, the commodity particles are deposited in the bucket and the subsequent separate outflow of water with subsurface suspensions through the holes in the side walls and the discharge of the commodity sediment from the buckets into the receiving hopper of the conveyor.

The disadvantages of this setup are the following:

energy is consumed to lift the source material and water into the feeder bin;

The limited angle of rotation of the rotor between the filling of the bucket and its emptying during slow gravitational separation of particles requires a low frequency of rotation of the rotor for high-quality separation of the material and thereby limits the productivity of dehydrator.

The purpose of the invention is to increase productivity.

This is achieved by the fact that in a known rotary-bucket booster dehydrator with scooping the mixture to be separated from the bunker

The ends of non-perforated buckets mate with discharge chutes, in the bottoms of which no less than one transverse slit is made to separate the flow of liquid with undigested raw materials suspended inside the rotor and the subsequent precipitate of commercial material into the receiving bunker of the conveyor. By varying the rotor's rotational speed, it is possible to control the mass (installation capacity) or the diameter of the precipitated particles in the bunker and the rotor buckets and, consequently, the boundary density or particle size of the commodity particles poured from the buckets into the receiving bunker of the conveyor.

5 Compared with the known proposed rotary bucket forcing-impregnator, it is distinguished by the fact that the hole for draining the liquid with unsettled non-commodity particles is made not on the side wall of the bucket, but in the form of a transverse slit in the bottom of the discharge chute, which allows scooping a separable mixture of commodity and non-commodity particles from the bunker and thereby increase the angle of rotation of the bucket between loading and unloading it. ...

Under comparable conditions (identical dimensions of buckets, rotor and diameters or masses of commodity particles) with

0 equal to the time between loading and unloading buckets, the proposed rotary bucket dresser-dehydrator has a high rotor speed and, consequently, greater productivity. AT

5 compared with rotary bucket dewatering machines with perforated buckets, the productivity of the proposed increases even more due to the fact that the rate of sedimentation of particles, for example, in water is more than an order of magnitude higher than

filtering water through pores in particles of the same diameter. The proposed device meets the criterion of novelty.

Analysis of known technical solutions in the studied area, i.e. hydromechanization, as well as in related and other areas (ore and coal industry, processing of nonmetallic building materials), showed that there are no signs in the equipment used that are similar to the significant distinctive feature in the proposed enrichment-dehydrating plant and allow to recognize the proposed The decision meets the criterion of a significant difference.

FIG. 1 shows a bucket rotary dresser-dehydrator, side view; in fig. 2 and 3 are examples of a slit with bent edges and with a tray overlapping it to reduce the loss of product fractions with liquid flowing from the ladle,

The bucket rotary dresser consists of a hopper 1, into which, for example, a water-soil mixture is continuously supplied, and a rotor wheel 2 mounted in supports located above the hopper. On the rotor wheel, the buckets 3 are rigidly fixed, coupled with the discharge chutes 4. A transverse slit 5 is made in the bottom of each discharge chute, the edges of which are bent to the inside of the rotor to use the Coande effect (sticking of the liquid when flowing along a curved surface) in order to drain all the liquid through the slot and preventing the commercial material from spilling out when it is unloaded from the bucket. The transverse slit may also overlap with the transverse tray 6 located on the outer side of the discharge chute. On the sides of the rotor, receiving hoppers 7 may be located to collect and remove liquid with unsettled subspecies slurries. On the unloading side, there is a receiving bunker 8 of commodity sediment with a conveyor 9.

The enrichment and dehydration of the feed mixture is carried out as follows. From the mixture of liquid and particles being separated continuously into the bunker 1, the largest or heaviest particles settle to the bottom of the bunker. The settled particles are scooped with buckets 3 fixed on the rotary wheel 2 rotated by the drive. At the same time the buckets scoop out the hopper and the mixture of liquid with commercial and non-commodity particles suspended in it. In the process of rotation of the rotor in the buckets 3, gravitational sedimentation of commodity fractions (more

coarse or heavier), and the non-commodity fractions remaining in the liquid in a suspended state flow with it to the discharge chute and flow down the slot 5 into the inside of the rotor or into the receiving bins 7 and further into the discharge pipe. With further rotation, the sediment of commercial material is poured from the bucket along the discharge chute 4 into the receiving bunker 8 of the conveyor 9. During operation of the concentrator, -. a dehydrator in the process line with a variable feed of enriched material it is advisable to place two or more transverse slots in the bottom of the groove,

5 which eliminates the ingress of water into the receiving bin 8 of the conveyor 9 with a reduced supply of enriched material and, therefore, scooping water into the buckets. quantities, large calculated. Partially

0 Commodity sediment flowing through slot 5 returns to hopper 1. The slot edges bent into the rotor (Fig. 2) allow liquids to flow through the slot when the trough is tilted towards unloading due to the Coande effect (liquid sticking as it flows along a curved surface) . With a further increase in the slope of the gutter, the product sediment is poured along the chute, passing a slit without spilling it.

0 To reduce the spillage of product sediment over the slit 5, the latter, on the outside of the trough, overlaps with a transverse tray 6 (Fig. 3). Falling during the unloading of the bucket into the channel 6, the sediment locks the gap 5

5 and reduces the spilling of marketable sediment into the hopper 1. As the rotor rotates further, the enrichment-dehydration cycle repeats alternately in all buckets. Volumetric moisture content of dewatered sludge

0 remains almost unchanged (approximately equal to the porosity of the marketable sediment), and the size of the smallest particles (or mass) deposited in the sediment depends on the frequency of rotation of the rotor. Obviously, the higher the frequency

5 rotation of the rotor, the larger or larger the particles that precipitate, and the higher will be the performance of the proposed rotary-bucket enrichment agent.

0 Formula of invention

Claims (3)

1. A rotary bucket dresser-dehydrator, comprising a rotor with buckets rigidly fixed on it, devices for loading material and sand unloading and connected to the buckets of devices for discharge of drain, characterized in that it is fitted with the discharge ends of the buckets discharge chutes, while One or more transverse slots are made in the bottoms of each groove. 2. The enrichment dehydrator of claim 1, wherein the edges of the transverse slots are bent towards the inside of the rotor. 3 2 3. The enrichment dehydrator according to claim 1, characterized in that it is. provided with a tray installed under the transverse slot, with a slot in the side or end wall of the tray, H demolish ground FIG.