RU2091171C1 - Centrifugal concentrator for ore dressing - Google Patents

Abstract

FIELD: ore mining and dressing industries. SUBSTANCE: proposed concentrator comprises body having cover and discharge pipe and housing rotor that includes vertical cylindrical shell having end wall, overflow edge and plurality of intercommunicating separating chambers arranged height-wise along said shell. Chambers are encircled from outside by annular cavity containing washing water admitted into chambers through openings. Shell also comprises means intended to supply washing water into rotor and made in form of distributing reservoir provided with water supply pipe and with radial channels for passage of water flow into annular cavity, inlet branch pipe for charging feed material, and rotor-actuating drive unit having shaft. Said separating chambers are formed by rigidly interconnected rings having conically shaped inner surface, minor base of cone being turned downwards. Said distributing reservoir for washing liquid is mounted on end wall of rotor shell and has radially extending channels. EFFECT: simple and efficient design ensuring high ore concentration percentages. 1 dwg

Description

 The invention relates to equipment for the separation of heavy and light solid phases in a centrifugal field, and more specifically to precipitation centrifuges, concentrators and can be used in the mining industry, for example, in the extraction of gold, platinum and other minerals.

A centrifugal concentrator for ore dressing is known, including a housing with a lid and a drain pipe, a rotor installed in it, containing a vertical cylindrical shell with an end wall and an overflow side, placed in it in height, and interconnecting separation chambers, on the outside of which there is an annular cavity for washing water supplied through openings inside the chambers, means for supplying washing water to the rotor, which is a distribution chamber with a supply pipe and radial channels for For the flow of water into the annular cavity, the loading pipe of the source material and the rotor drive containing the axis [1]
A disadvantage of the known hub is the design complexity, as well as the inability to unload the finished product without disassembling the hub.

 The technical result of the invention is to simplify the design of the hub and the possibility of unloading the product from the rotor by washing it with wash water when the rotor stops.

 To achieve this result, the proposed centrifugal concentrator for ore dressing, including a housing with a lid and a drain pipe, a rotor installed in it, containing a vertical cylindrical shell with an end wall and an overflow side, are placed in it in height and communicate with each other separation chambers, the outside of which there is an annular cavity for washing water supplied through openings inside the chambers, means for supplying washing water to the rotor, which is a separation chamber with supply a nozzle and radial channels for the flow of water into the annular cavity, an unloading nozzle of the starting material and a rotor drive containing an axis, the separation chambers are formed by rings rigidly fixed to each other, having a cone-shaped inner surface, the smaller base of which faces downward, while the wash water distribution chamber is mounted on the end wall of the shell, and the radial channels are made in it. The rotor is equipped with distributing means of the feed material mounted on a cup placed on the drive axis by bearings.

 The invention is illustrated in the drawing, which schematically shows the proposed centrifugal concentrator in longitudinal section.

 The centrifugal concentrator includes a housing 1 with a cover 2 and a drain pipe 3, a rotor 4 installed in it, containing a vertical cylindrical shell 5 with an end wall 6 and an overflow side 7, which are arranged in height and communicating with each other annular separation chambers 8, the outside of which is located an annular cavity 9 for washing water supplied through openings 10 inside the chambers, means for supplying washing water to the rotor, which is a distribution chamber 11 with a supply pipe 12 and radial channels 13 for outflow of water into the annular cavity, the feed pipe 14 of the source material and the rotor drive containing the axis 15. The separation chambers 8 are formed by rings 16 rigidly fixed to each other, having a conical inner surface 17, the smaller base of which is facing down. The distribution chamber 11 of the washing water is mounted on the end wall 6, and the radial channels 13 are made in it. The rotor 4 is equipped with distributing means of the supplied material, made in the form of a reflector 18 located inside the rotor under the loading nozzle 14 and mounted on the cup 19, placed on the axis 15 of the drive by means of bearings 20.

 The housing 1 has a conical bottom 21 with a discharge pipe 22, inside of which a crosspiece 23 is fixed, rigidly connected to the axis 15 of the drive.

 The rings 16 forming the separation chambers are sandwiched between the overflow side 7 and the end wall 6 with the help of studs 24.

 The reflector 18 is also attached to the end wall 6 of the shell 5 with the help of crackers 25.

 The drive contains a V-belt drive 26 and a pulley 27.

 On the lid 2 of the housing 1 of the concentrator there is a collection 28 with a supply pipe 29 for washing water.

 Centrifugal concentrator operates as follows.

 Initially, the centrifuge rotor 4 is rotated by means of gear 26, then flushing water is supplied through the nozzle 29 and collector 28 to the rotary distribution chamber 11. From it, under the action of centrifugal forces, water enters the annular cavity 13 into the annular cavity 9, from which water flows through the openings 10 into the annular separation chambers 8. After filling these chambers, water is poured over the overflow side 7 and discharged into the housing 1 and then discharged through the pipe 3.

 After a steady flow of water appears on the discharge pipe 3, indicating that the rotor is filled with washing water, the feed begins to flow through the pipe 14 (the product can be supplied in the form of powder or pulp). The enriched product enters the reflector 18 and then, under the action of centrifugal forces, is scattered into the annular separation chambers 8. Here, the particles of the solid product come into contact with the wash water flow that rises to the center of the rotor, while the water flow is adjusted so that light particles are carried to the center and from ring to ring they move to the lower base of the rotor, while heavy ones settle and accumulate at the periphery of the chambers 8.

 As the annular separation chambers 8 are filled with a heavy fraction, unloading is performed. To do this, the flow of flushing fluid is stopped and the rotor stops. During shutdown, the residual washings wash off the accumulated product from the annular separation chambers onto the conical bottom 21 and then through the pipe 22 into any container installed under the hub. In case of insufficient flushing, briefly turn on the flushing water supply, not including the rotor.

 Example. On a hub with a rotor diameter of 120 mm, with a rotation speed of 1420 rpm, and a wash water flow rate of 20 l / min. 40 kg of sand with a gold content of 2.7 g / t were passed. After enrichment, 85 g of concentrate with a gold content of 1150 kg / t was obtained; enrichment occurred 425 times. A higher degree of enrichment could be achieved with more enriched sands.

Claims (1)

 A centrifugal concentrator for ore dressing, including a housing with a lid and a drain pipe, a rotor installed in it, containing a vertical cylindrical shell with an end wall and an overflow side, height chambers placed in it and communicating with each other, with an annular cavity for washing water located outside supplied through the holes into the chamber, a means of supplying washing water to the rotor, which is a distribution chamber with a supply pipe and radial channels for prot water in the annular cavity, the loading pipe of the source material and the rotor drive containing an axis, characterized in that the separation chambers are formed by rings rigidly fixed to each other, having a cone-shaped inner surface, the smaller base of which faces downward, while the distribution chamber of the washing liquid is mounted on the end the wall of the shell of the rotor, and the radial channels are made in it, and the rotor is equipped with distributing means of the feed material mounted on the glass, placed m on the drive axis through bearings.