RU1792740C - Magnetic deslimer - Google Patents

Abstract

Usage: in the field of gravitational magnetic separation of granular mixtures in a moving pulp stream and for the enrichment of finely divided magnetic ores. The deslamator includes a cylindrical housing 1 with loading 4 and unloading 5 devices, water supply nozzles, a magnetic system made in the form of blades and hollow truncated cones 9 mounted concentrically with smaller bases down from a magnetic mesh with square cells, while the upper the edges of the cones 9 are located at the level of the drain threshold, rectangular magnetic plates 10 are horizontally mounted on a grid in a checkerboard pattern at a distance from each other in height equal to from 0.021 to 0.074 of the height of the cylinder horizontal part of the body, equal to from 0.0164 to 0.03 of the circumference of the truncated cone on which the corresponding row of plates is located, while the upper edges of the upper row of plates are located at the level of the drain threshold, and the side length of the square mesh cell is from 0.004 to 0.006 the height of the cylindrical part of the housing. The product in the form of pulp enters the casing 1, The magnetic material contained in the pulp is deposited on the bottom of the casing 1 and on the surface of the cones 9, where the particles, under the action of the polygradient magnetic field created by the plates 10, form flocs that break off and fall on the bottom of the casing. 1. 2 ill., 1 tab. h and

Description

The invention relates to the field of gravitational magnetic separation of granular mixtures in a moving pulp stream and can be used to enrich finely divided magnetic ores.

For gravitational magnetic separation of the material in an aqueous medium, apparatuses of various designs are used in modern technology.

A magnetic deslamator is known for deslamation and thickening of finely ground highly magnetic material, including a vat with an annular drain trough in the upper part, magnetizing devices, a magnetic system installed below the lower edge of the drain trough, and feeding and unloading nozzles and grabs mounted on a shaft. established with the opportunity; rotations in the center of the vat, a non-magnetic disk with a fixed ring non-magnetic overlap installed under it in the upper part of the vat, the magnetic system is made up of spaced sector parts, each of which is attached by non-magnetic rods to the walls of the vat, in which pipes with magnetizing apparatus, the disk being rigidly connected to the shaft, the magnetic system being located above the disk with a gap, its radius is equal to the radius of the disk, and and the radius of the disk and the width of the annular overlap is equal to the radius of the vat.

The magnetic deslamator of this design has the following disadvantages. When using its pulp flow in the area between the non-magnetic Disk and the ring non-magnetic overlap, due to the small live section, it moves at a high speed, as a result of this, the mechanical forces acting on individual - thinner magnetic particles exceed the magnetic ones and they (these particles) addicted to the drain. In addition, the thickener has an insufficient thickening area. The noted disadvantages lead to an increase in the metal content in the drain and to a decrease in the enrichment efficiency. The closest to the claimed device in terms of technical nature and the achieved result is a magnetic stripper, including a cylindrical-conical housing, with loading and unloading devices, nozzles for supplying water, blades for raining sediment, a drain threshold and a magnetic system.

The disadvantage of this deslamator is insufficient thickening area,

which leads to a decrease in productivity and a decrease in separation efficiency.

The goal is achieved in that

the magnetic system is made in the form of hollow truncated cones of concentric smaller smaller bases made of magnetically flexible mesh with square cells, with the upper edges of the cones located at the level of the drain threshold, rectangular magnetic plates spaced horizontally on a grid in a checkerboard pattern with the long side horizontally from each other in height equal from 0,021 to 0,074

the height of the cylindrical part of the housing

horizontal equal from 0.0164 to 0.08 length

. circumference of a truncated cone on which.

the corresponding row of plates is located,

the upper edges of the upper row of plates are located at the level of the drain threshold, and the length of the side of the square mesh cell is from 0.004 to 0.006 of the height of the cylindrical part of the housing.

In order to determine the above optimal sizes and parameters of the proposed invention, three series of experiments were carried out (see table) on a declared magnetic detacher equipped with a magnetic system in the form of three hollow truncated cones made of magnetically mesh square cells with concentric smaller bases downward, with the upper the edges of the cones are located at the level of the drain threshold; rectangular magnetic plates are horizontally mounted on the grid in a checkerboard pattern with the long side horizontally.

In each series of experiments, one of the parameters and dimensions of the device changed; the other ones did not.

In the first series of experiments, the distance between the magnetic plates changed in height; it was, respectively, 0.01, -0.021; 0.038: 0.074-0.18, the height of the cylindrical part of the body was N.

A second series of experiments was carried out at different horizontal distances between the magnetic plates equal to 0.0131; 0.0164; 0.021; 0.030; 0.046 of the circumference of the truncated cone, L, on which the corresponding row of magnetic plates is located.

In the third series of experiments, the length of the side of the square cell with a magnet of a flexible mesh was changed; it was, respectively, 0.003; 0.004; 0.005: 0.006: 0.007 the height of the cylindrical part of the housing is N.

For comparison, in each series of experiments on identical ore, studies were carried out using a PROTOTijina 2 device.

All experiments were carried out on a representative sample of magnetic iron ore with a circle of 1–0 mm, with an iron content of 514–55.4%.

 The results of the experiments are shown in the table. As can be seen from the data in the table, the optimum | are the following dimensions and parameters: the distance between the magnetic plates in height is 0.021-0.074 N; horizontal distance between magnetic plates 0.0164-0.030L; the length of the side of a square cell with a magnet of a flexible grid is 0.064-0.006 N.

With the above optimal sizes and parameters (see Table 1, experiments 4, 10, 16), the productivity and separation efficiency are 90.6, respectively; 104.0; 85.0 t / h; and 9.2; 8.5; 9.8%.

 As regards the hydraulic classification of thickening and ore dressing on the prototype hydroseparator (see table 1, experiments 1, 7, 13), here, in comparison with the results obtained in the claimed device (see table 1, experiments 4, 10, 16) on average, productivity is lower by 1.3, and separation efficiency is 1.5 times lower. The manufacture of a magnetic detoxifier according to the invention does not cause technical complexity and can be carried out under the conditions of existing metallurgical enterprises.

 Figure 1, 2 presents the proposed magnetic deslamator.

The magnetic deslamator consists of a casing 1 (Fig. 1) with a cylinder top 2, a conical lower 3, a loading 4 and an unloading 5 devices, water supply pipes 6, spiral blades 7, a circular circular threshold 8, hollow truncated coils 9 and magnetic plates 10.

; Cylindroconical housing - working. This is where the direct process of hydraulic classification, condensation and enrichment takes place. The loading device serves to evenly distribute the pulp when it is introduced into the cylinder-conical housing. Spiral-shaped blades are designed to transport the condensed product to the unloading device, the drain circular threshold serves to uniformly discharge the drain. Concentrally arranged along the first truncated cones, attached to the upper part of the cylindrical body, with the lower bases down, are made of magnetically flexible mesh with a side length of a square cell and equal to 0.004-0.006 of the height of the cylindrical part of the body.

Figure 1 shows 3 hollow truncated cones made of magnetically flexible mesh, on them in a checkerboard pattern with the long side perpendicular to the height of the cone

the magnetic plates are stacked and fixed at a distance from each other in height h equal to 0.021-0.074 of the height of the cylindrical part of the body, - horizontally - I is equal to 0.0164-0.030 of circumference

a truncated cone on which the corresponding row of magnetic plates is located,

The operation of the magnetic deslaiter is as follows: the initial granular magnetic product in the form of pulp arrives

into the loading device 4, from where it is directed by a uniform flow into the cylindrical body 1. The magnetic material contained in the pulp is deposited on the bottom of the body and on the surface of the concentrically arranged truncated cones 9. On the surface of the truncated cones, magnetic particles under the influence of a polygradient magnetic field created by the magnetic plates 10 form flocs that

as they grow under the action of gravity, they come off and fall on the bottom of the body. In the cylindrical-conical part of the housing, due to the supply of water through the nozzles 6, hydraulic classification occurs

and enrichment of settling material. The product deposited on the bottom of the body, when the blades 7 rotate around the vertical axis, is raked to the unloading device 5, through which it is removed from

apparatus. Silty particles: under the influence of an upward flow of pulp, they move to the upper cylindrical part of the body, from where they are unloaded with water through a circular discharge threshold 8.

Concentricly located truncated cones create a calmer zone in the cylindrical part of the body, increase the deposition area, and the mesh from which they are made allows washing up slurry particles from the product deposited on their surface by upward pulp. Moreover, magnetic plates 10 located on truncated cones in a checkerboard pattern create a polygradient

magnetic field, which prevents the removal of magnetic particles into the drain.

Thus, the increase in the deposition area achieved by this design of the magnetic stripper allows for an increase in productivity and separation efficiency. EXAMPLE 1. Concerning the minimum dimensions of the side of a square cell with a magnet by a soft grid and parameters

the arrangement of magnetic plastins on it.

The experimental conditions are similar to those under which the experiments were carried out to determine the optimal parameters according to the proposed invention.

The diameter and height of the cylindrical part of the casing of the magnetic deslaiter were 9000 and 2000 mm, respectively, the length of the hollow truncated cones and the angle of inclination to the horizontal were 488 mm and 55 °, respectively, the diameters of the upper and lower bases of the hollow truncated cones were 7600, 7200, respectively , 6800 mm and 7040, 6640, 6240 mm, length - a. the width - c and thickness - b of the magnetic plates were 85, 64, and 14 mm, respectively. .:

Magnetic plates were located on hollow truncated cones of magnetically flexible mesh, and the height distance was 0.021 of the height of the cylindrical part of the body and was 0.021 x 2000 42 mm. The number of rows of magnetic plates on each cone is determined by the formula:

n c: (h + b), where p t is the number of rows, pcs;

C is the length of the generatrix of the cone, mm;

h is the distance between the magnetic plates, mm; ::

in - the width of the magnetic plate, mm;

p 488: (42 + 64) 4.6 5 rows

the horizontal distance between the plates - I was 0.0164 of the circumference of the cone on which the corresponding row of magnetic plates is located and was:

T. In a large cone in the first upper row.

I 0.0164: 7600 x 3.14 394 mm the number of plates in a row horizontally was determined by the formula:

m L: (a + I). . where m is the number of Magnetic plates, pcs;

L is the circumference on which the corresponding row of plates is located, mm;

t is the horizontal distance between the plates, mm;

ag - plate length, mm;

m 23864: (85 + 394) 50 pcs. ;

2. In a large cone in the second row.

Da D + (S cos a) x 2; S C - (b + h)

S 483 - (64 + 40) 384 mm,

DZ 7600 + (384 x cos 55 °) to 2 7480 mm

L 3.14 x 7480 23485 mm;

1 0.0164x23485 385 mm

Number of plates

m 23485: (85 + 385) 50 pcs.

The explanation for the calculation is shown in figure 2.

The calculation of each subsequent row is carried out similarly. According to the calculation, the horizontal distance between the magnetic plates was, mm: in a large cone: in the third row - 378: in the fourth row - 369; in the first row, 362; in the middle cone: in the first upper

r du 367; in the second row, 362; in the third row, 352; in the fourth row, do -344; in the first row - 337: in a small cone: in the first false row - 342; in the second row, do -337; in the third row, -327; in the fourth row, -319; in the fifth row, there are 312 on all cones in each row horizontally there are 50 plates. The side size of the square cell was 0.004 x the height of the cylindrical portion of the body and was 0.004 x 2000 8 mm.

When this magnetic deslameter was introduced into operation, the following results were obtained: productivity 90 t / h, separation efficiency 9.4%.

PRI me R 2. relates to the average dimensions of the side of a square cell with a magnet of a flexible grid and the location parameters of the magnetic plates on it according to the alleged invention, namely:

- the distance between the magnetic plates in height was 77 mm (4 rows of plates are located on the cone at a height);

- horizontal distance between magnetic plates, mm: in a large cone: in the first row I 512; in the second row, 12,499;

in the third row, 1z 486;

in the fourth row, Ts 474; in the middle cone: in the first row I 480; in the second row, 12,467; in the third row, 1z 454;

in the fourth row, 14,441; in a small cone: in the first row I 449; in the second row, 2,436; in the third row, s 423; in the fourth row, 4 to 410; in all rows of all cones, 40 plates are located horizontally;

- the size of the side of a square cell with a magnet of a mesh was 10 mm. The conditions of the experiments and calculations in this example are similar to those adopted in Example 1. With the introduction of this magnetic deslator, the following results were obtained: productivity 85 t / h, separation efficiency 9.8%.

Example 3 relates to the maximum values of the side of a square cell with a magnetic grid and the location parameters of the magnetic plates of the proposed invention, namely:

- the distance between the plates in height e was 148 mm (3 rows of plates are located in the cones in height);

- horizontal distance between magnetic plates, mm:

in a large cone: in the first row in the second row; in the third row in the middle case: in the first row; in the second row in the third row in the first row

in a small cone:

in the second row in the third row

710; 685; 660; 668; 643 ;. 618; 627; 601; 576.

On all cones in each row, 40 plates are located by concentration;

- the side size of the square cell was 12 mm. The experimental conditions and calculations in this example are similar to those adopted in example 1.

When this magnetic deslamer was introduced into operation, the following results were obtained: productivity 85 t / h, separation efficiency 9.9%.

The results of examples of specific performance showed that when the magnetic stripper according to the invention is used, in comparison with the prototype, on average, productivity increases by 1.3 times, separation efficiency increases by 1.5 times.

Claims (1)

The claims Magnetic deslamator, which includes a cylindrical-conical housing with loading and unloading devices, nozzles - for supplying water to the housing, blades for raking sediment, a drain threshold and a magneto-system, so that In order to increase the productivity and separation efficiency by increasing the deposition area, the magnetic system is made in the form of installed con | centrically smaller bases downward of truncated cones from the magnetic grid b by square cells, while the top is the results of experiments to determine the optimal dimensions of the square side cells with a magnet of a soft grid and parameters of the arrangement of magnetic plates in a magnetic deslamator the edges of the cones are located at the level of the drain threshold, on the grid in a checkerboard pattern with the long side horizontally mounted rectangular magnetic plates at a distance from each other in height equal to 0,021-0,074 the height of the cylindrical part of the body, horizontally - equal to 0,0164 -0.08 of the circumference of the truncated cone on which the corresponding row of plates is located, while the upper edges of the upper row of plates are located at the level of the drain threshold, and the side length of the square mesh cell is equal to 0.004-0.006 of the height of the cylindrical part corps. Table 1 Table continuation Table continuation  The experiments were carried out at various Ni values. Table continuation