CN215741970U

CN215741970U - Device for uniformly discharging ore from center of bottom of thickening tank

Info

Publication number: CN215741970U
Application number: CN202121090529.9U
Authority: CN
Inventors: 李克宪; 周秀英
Original assignee: Lanzhou Engineering and Research Institute of Nonferrous Metallurgy Co Ltd
Current assignee: Lanzhou Engineering and Research Institute of Nonferrous Metallurgy Co Ltd
Priority date: 2021-05-20
Filing date: 2021-05-20
Publication date: 2022-02-08
Anticipated expiration: 2031-05-20

Abstract

The utility model discloses a device for uniformly discharging ore from the center of the bottom of a thickening tank, belongs to the field of mine engineering, and solves the problem of non-uniform ore discharging concentration of the traditional large concrete thickening tank. The concentrated tank comprises a central confluence mixing piece, at least two ore discharging branch pipes and an ore discharging main pipe, wherein the central confluence mixing piece is positioned in a central column of a concentrated tank and below the concentrated tank body, the central confluence mixing piece is in a funnel shape and consists of a circular table with an inverted upper part and a vertical pipe with a lower part, and an inner ring annular tooth socket and an outer ring annular tooth socket are arranged at the joint of the circular table and the vertical pipe; the ore discharging branch pipe is connected with the circular truncated cone; the ore discharging main pipe is connected with the vertical pipe and connected to the outside of the central column of the thickening tank, and a valve is arranged on the ore discharging main pipe. The utility model adopts central ore removal, the ore discharge concentration is uniform and stable, and the service life of the bottom ore discharge pump is prolonged. The two rings of annular tooth grooves reduce the flow velocity of the ore discharging branch pipes, reduce the abrasion of the junction and change the converging water flow direction of the ore discharging branch pipes, reduce the funnel-shaped water plug and improve the ore discharging capacity.

Description

Device for uniformly discharging ore from center of bottom of thickening tank

Technical Field

The utility model belongs to the field of mine engineering, and particularly relates to a device for uniformly discharging ores from the center of the bottom of a thickening tank.

Background

The large concrete thickening tank is provided with a bottom central column and a bottom annular gallery, the bottom of the tank body is in a gently inclined conical shape, and an annular overflow groove for discharging overflow water is arranged on the upper edge of the inner wall of the tank body. The vertical shaft positioned in the center of the pool body is connected with a rake frame mechanism, the rake frame mechanism consists of rake arms, rake teeth and bracing pieces for reinforcement, and the two radially arranged rake arms are mutually vertical to form a cross shape. The low-concentration ore pulp is conveyed to the center of the thickener by a pulp inlet pipe, and is mixed with the medicament, and then the ore pulp is divided into two parts of clear liquid and high-concentration sediment under the action of the self gravity of solid particles. Clear liquor is discharged from the upper annular overflow groove, high-concentration sediments are discharged from all ore discharge pipes at the bottom of the thickening tank, an annular pipe is formed along the bottom annular gallery, and then one ore discharge pipe or two ore discharge pipes are used for discharging. When the dense pool runs, ore is generally discharged from two ore discharge pipes on one diagonal line, and two ore discharge pipes on the other diagonal line are reserved. The concentrated ore pulp at the bottom of the thickening tank flows along with the circular motion of the rake rack and is discharged from the open ore discharge pipe. The disadvantage of this kind of ore discharge pipe is that the concentration increases sharply when the rake frame runs to the outflow of the ore discharge pipe, and when the rake frame passes over the ore discharge pipe, the concentration of the ore discharge pipe becomes very low immediately, and the ore discharge concentration is very uneven. When the slurry pump is arranged at the bottom of the thickening tank, the slurry pump meets high-concentration slurry, the operation load is increased, the current of the motor is increased steeply, and the overload phenomenon can occur; when the ore pulp with low concentration is encountered, the current of the motor quickly falls back. This is very detrimental to the operation of the slurry pump, resulting in a shortened life of the slurry pump. The ore pulp valve is opened frequently, and the fault rate is high, changes frequently, influences enterprise's normal production.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a device for uniformly discharging ores from the center of the bottom of a thickening tank, which is used for solving the problem of non-uniform ore discharging concentration of the traditional large concrete thickening tank.

The technical scheme of the utility model is as follows: a device for uniformly discharging ores from the center of the bottom of a thickening tank comprises a central confluence mixing piece, at least two ore discharging branch pipes and an ore discharging main pipe, wherein the central confluence mixing piece is positioned in a central column of the thickening tank and below the thickening tank body, the central confluence mixing piece is in a funnel shape and consists of a circular table with an inverted upper part and a vertical pipe with a lower part, and two layers of annular tooth sockets are arranged at the joint of the circular table and the vertical pipe and are respectively an inner ring annular tooth socket and an outer ring annular tooth socket; the ore discharging branch pipe is connected with the circular truncated cone; the ore discharging main pipe is connected with the vertical pipe and connected to the outside of the central column of the thickening tank, and a valve is arranged on the ore discharging main pipe.

For a further development of the utility model, four ore discharge branch pipes are provided.

As a further improvement of the utility model, the lower end of the vertical pipe is provided with a buffer groove which is positioned below the joint of the ore discharge main pipe and the vertical pipe.

As a further improvement of the utility model, a bottom pipe gallery is arranged below the dense pool body, the bottom pipe gallery is arc-shaped, the ore discharge main pipe penetrates through the bottom pipe gallery, and the first valve is positioned in the bottom pipe gallery.

As a further improvement of the utility model, the arc angle of the bottom pipe gallery is not more than 90 degrees.

As a further improvement of the utility model, the teeth on the inner ring annular tooth groove are arranged in a staggered way with the teeth on the outer ring annular tooth groove.

As a further improvement of the utility model, 8 teeth are uniformly arranged on the inner ring annular tooth groove and the outer ring annular tooth groove respectively.

As a further improvement of the utility model, a sleeve is arranged outside the ore discharging main pipe and is connected with the vertical pipe.

The utility model improves the ore discharge pipes of the traditional large-scale concrete thickening tank, adopts an internal ore discharge mode, simultaneously discharges ores from the ore discharge branch pipes, designs a central confluence mixing piece in the central column, and discharges underflow ore pulp from an ore discharge header pipe after mixing in the central confluence mixing piece, so that the ore discharge concentration is uniform and stable. The bottom ring corridor does not need to be made into a 360-degree ring, so that the bottom ring corridor and the ore drawing branch pipe valve are omitted, the failure rate is greatly reduced, and the investment is also saved.

Compared with the prior art, the utility model has the following advantages:

1. the device adopts central ore removal, the ore discharge concentration is uniform and stable, and the service life of the bottom ore discharge pump is prolonged.

2. According to the utility model, two rings of annular tooth grooves are arranged at the bottom of the circular table of the central confluence mixing piece, so that the design reduces the flow velocity of the ore discharge branch pipe and reduces the abrasion of a junction on one hand; on the other hand, the converging water flow direction of the ore discharging branch pipes is changed, the funnel-shaped water plug is reduced, and the ore discharging capacity is improved.

3. According to the utility model, the buffer groove is arranged at the lower end of the lower vertical pipe of the central confluence mixing piece, so that the mixing force can be increased, and the abrasion of the total ore discharge pipe can be reduced. If the buffer tank is not designed, the ore discharging main pipe is directly connected with the vertical pipe at the lower part of the central confluence mixing part, an arc-shaped bent pipe is formed at the joint of the lower end of the ore discharging pipe and the lower end of the ore discharging pipe, and the abrasion can be greatly accelerated.

4. The bottom ring corridor does not need to be made into a 360-degree ring shape after the utility model is adopted, and only the bottom ring corridor needs to be made into a circular arc shape with the angle not more than 90 degrees, so that the bottom ring corridor and the ore drawing branch pipe valve are omitted, the failure rate is greatly reduced, the concrete amount is reduced, and the investment is saved.

Drawings

FIG. 1 is a plan view of the present invention;

FIG. 2 is a view A-A of FIG. 1;

FIG. 3 is a D-D view of FIG. 2;

FIG. 4 is a view B-B of FIG. 3;

FIG. 5 is a top view of a center-manifold mixing block of the present invention;

fig. 6 is a view C-C in fig. 5.

In the figure: 1-central confluence mixing; 2-inner ring annular tooth grooves; 3-outer ring annular tooth groove; 4-vertical tubes; 5-a dense pool body; 6-a central column of the thickening tank; 7-a rake mechanism; 8-ore discharge branch pipes; 9-an annular overflow trough; 10-a slurry inlet pipe; 11-a main pipe for ore discharge; 12-a first valve; 13-a second valve; 14-a tee joint; 15-flushing water pipe; 16-a buffer tank; 17-a sleeve; 18-bottom tube lane; 19-round table.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

Generally, the thickening tank comprises a thickening tank body 5, a thickening tank central column 6, a rake mechanism 7 and a slurry inlet pipe 10, and an annular overflow groove 9 is arranged on the upper edge of the inner wall of the thickening tank body 5.

The utility model is shown in figures 1-6, a device for uniformly discharging ores from the center of the bottom of a thickening tank comprises a central confluence mixing part 1, at least two ore discharging branch pipes 8 and an ore discharging main pipe 11, wherein the central confluence mixing part 1 is positioned in a central column 6 of the thickening tank and below a thickening tank body 5, the central confluence mixing part 1 is funnel-shaped and consists of a circular table 19 with an inverted upper part and a vertical pipe 4 with a lower part, and two layers of annular tooth sockets, namely an inner ring annular tooth socket 2 and an outer ring annular tooth socket 3, are arranged at the joint of the circular table 19 and the vertical pipe 4; the ore discharging branch pipe 8 is downwards inclined at a certain angle and connected into the circular truncated cone 19; the ore discharging main pipe 11 is connected with the vertical pipe 4 and is downwards inclined at a certain angle to the outside of the central column 6 of the thickening tank, and a valve 12 is arranged on the ore discharging main pipe 11.

Four ore discharge branch pipes 8 are arranged.

The lower end of the vertical pipe 4 is provided with a buffer groove 16, and the buffer groove 16 is positioned below the joint of the ore discharge main pipe 11 and the vertical pipe 4. The buffer tank 16 is 30cm deep.

The lower portion of the dense pool body 5 is provided with a bottom pipe gallery 18, the bottom pipe gallery 18 is arc-shaped, the ore discharge main pipe 11 penetrates through the bottom pipe gallery 18, and the first valve 12 is located in the bottom pipe gallery 18.

The arc angle of the bottom tube lane 18 is not greater than 90 degrees.

The teeth on the inner ring annular tooth groove 2 and the teeth on the outer ring annular tooth groove 3 are arranged in a staggered mode. 8 teeth are uniformly arranged on the inner ring annular tooth groove 2 and the outer ring annular tooth groove 3 respectively.

The exterior of the ore discharging main pipe 11 is provided with a sleeve 17, and the sleeve 17 is connected with the vertical pipe 4.

The ore discharging main pipe 11 is also provided with a second valve 13, the first valve 12 is connected with the second valve 13 through a tee 14, and the other end of the tee 14 is connected with a flushing water pipe 15. The second valve 13 is located in the bottom pipe gallery 18. When the flushing is needed, the second valve 13 is closed, water in the flushing water pipe 15 enters the ore discharge main pipe 11 through the first valve 12, and after the flushing is finished, the second valve 13 is opened to discharge the water.

Example 1, the implementation method of underflow ore discharge in the middle and middle 62m tailings thick pond of a certain large gold ore separation plant in China is as follows:

1. the tank body 5 is of a concrete structure. And calculating ore discharge flow and the pipe diameter of the ore discharge pipe according to the ore discharge concentration of the bottom flow of the thickening tank. The four ore discharge branch pipes 8 discharge ore simultaneously, the flow rate is controlled to be about 1.0m/s, and the abrasion is reduced. The pipe diameters of the four ore discharge branch pipes 8 in the project are selected to be DN 250.

2. The wall thickness of the ore discharge branch pipe 8 is calculated, a seamless steel pipe is generally selected, and a certain margin is considered according to the abrasion in the whole service period.

The wall thickness of the straight pipe section of the steel pipe is preferably calculated according to the following formula:

t= P·D/2Kφσs＋C·S

in the formula: calculating the wall thickness (mm) of the t-straight pipe section steel pipe;

p-the design internal pressure (MPa) of the pipeline;

d-the outside diameter (mm) of the steel tube;

k-design coefficient, taking 0.72 in general area outside the pump station and 0.6 in the pump station;

σ s-minimum yield strength (MPa) of the pipe;

phi-the welding seam coefficient of the pipe is taken according to the relevant regulations of the existing national standard GB 50253 of oil pipeline engineering design Specification;

c-annual mill corrosion rate (mm/a);

s-pipeline design life (a).

The former term of the formula is pipeline abrasion caused by pipeline internal pressure, the height of a general large-scale thickening tank is 7-8 m, the length of an ore discharge branch pipe 8 is short, and the abrasion caused by the internal pressure is very small and can be ignored. The abrasion in the service life of the pipeline is mainly considered, the annual abrasion rate is related to the properties of ores, flow velocity, fineness of tailings and granularity grading, and the annual abrasion rate is generally determined through experiments and is generally 0.3-0.5 mm/year according to empirical data. The service life of the project is 20 years, certain margin is considered, and the wall thickness of the ore discharge branch pipe 8 is 20 mm.

3. The central confluence mixing piece 1 is designed. Referring to fig. 4, 5 and 6, the central confluence mixing piece 1 is designed into a funnel shape, and the bottom of the circular truncated cone 19 of the central confluence mixing piece 1 is provided with two circles of annular tooth grooves. On one hand, the design reduces the flow velocity of the ore discharge branch pipe 8 and reduces the abrasion of the junction; on the other hand, the direction of the confluent water flow of the ore discharge branch pipe 8 is changed, the funnel-shaped water plug is reduced, and the ore discharge capacity is improved. The tooth height of the outer ring annular tooth groove 3 is lower than that of the inner ring annular tooth groove 2. A30 cm buffer groove 16 is designed at the bottom of the ore extraction pipe.

4. The ore discharging main pipe 11 adopts a sleeve mode, the sleeve 17 is arranged outside the ore discharging main pipe 11, the sleeve 17 is directly welded with the vertical pipe 4 at the lower part of the central confluence mixing part 1, and the figure 4 shows. The middle gap of the external sleeve 17 of the ore discharging main pipe 11 is filled with butter, and the two ends are sealed by flexible materials. The design of the casing mode mainly considers that the pipe wall of the ore discharging main pipe 11 becomes thin after an external butt flange is abraded, and secondary flange connection cannot be carried out. The design of the casing pipe is beneficial to replacing an external flange and checking the abrasion condition of the internal ore discharging main pipe 11. And (3) calculating the pipe diameter of the ore discharging main pipe 11 according to the total ore discharging amount, wherein the total ore discharging gradient is more than 3 percent, and the flow speed is 1.2-1.5 m/s. The diameter of the ore discharge main pipe 11 in the project is D377 multiplied by 10, and the diameter of the external sleeve 17 is D426 multiplied by 10.

5. The bottom pipe gallery 18 is made to be 90 degrees, and the installation and the maintenance of the ore discharge main pipe 11 are met. See fig. 3.

The utility model adopts the inner part of the central column for ore removal, cancels the traditional bottom annular duct, has stable concentration of outflow flow at the bottom of the thickening tank, greatly reduces the number of valves and improves the operation reliability.

Claims

1. The utility model provides a device of even ore discharge in dense bottom of pool center which characterized in that: the concentrated ore collecting device comprises a central collecting mixing part (1), at least two ore discharging branch pipes (8) and an ore discharging main pipe (11), wherein the central collecting mixing part (1) is positioned in a central column (6) of a concentrated pond and below a concentrated pond body (5), the central collecting mixing part (1) is funnel-shaped and consists of a circular table (19) with an inverted upper part and a vertical pipe (4) with a lower part, and two layers of annular tooth sockets, namely an inner ring annular tooth socket (2) and an outer ring annular tooth socket (3), are arranged at the joint of the circular table (19) and the vertical pipe (4); the ore discharging branch pipe (8) is connected into a circular truncated cone (19); the ore discharging main pipe (11) is connected with the vertical pipe (4) and connected to the outside of the central column (6) of the thickening tank, and a first valve (12) is arranged on the ore discharging main pipe (11).

2. The apparatus for uniformly discharging ore from the center of the bottom of the thickening tank according to claim 1, wherein: four ore discharge branch pipes (8) are arranged.

3. The apparatus for uniformly discharging ore from the center of the bottom of a thickening tank according to claim 1 or 2, wherein: the lower end of the vertical pipe (4) is provided with a buffer groove (16), and the buffer groove (16) is positioned below the joint of the ore discharge main pipe (11) and the vertical pipe (4).

4. The apparatus for uniformly discharging ore from the center of the bottom of the thickening tank according to claim 3, wherein: dense cell body (5) below is equipped with bottom piping lane (18), and bottom piping lane (18) are circular-arcly, ore discharge house steward (11) pass bottom piping lane (18), first valve (12) are located bottom piping lane (18).

5. The apparatus for uniformly discharging ore from the bottom center of the thickening tank according to claim 4, wherein: the arc angle of the bottom pipe gallery (18) is not more than 90 degrees.

6. The apparatus for uniformly discharging ore from the center of the bottom of the thickening tank according to claim 5, wherein: the teeth on the inner ring annular tooth groove (2) and the teeth on the outer ring annular tooth groove (3) are arranged in a staggered manner.

7. The apparatus for uniformly discharging ore from the center of the bottom of the thickening tank according to claim 6, wherein: the inner ring annular tooth groove (2) and the outer ring annular tooth groove (3) are respectively and uniformly provided with 8 teeth.

8. The apparatus for uniformly discharging ore from the center of the bottom of the thickening tank according to claim 7, wherein: and a sleeve (17) is arranged outside the ore discharge main pipe (11), and the sleeve (17) is connected with the vertical pipe (4).