Cone separator for heavy minerals

FIELD: mining industry; devices for minerals dressing using a method of heavy minerals separation.

SUBSTANCE: the invention is pertinent to mining industry, in particular, to devices for minerals dressing using a method of heavy minerals separation. The heavy minerals cone separator includes a body, a drive, an airlift with a receiving box, a drainage sifter with a drain pan and a rabble. A zone of separation is partitioned from a stagnation zone by a ring-type cleaver-pusher. The cleaver-pusher is fixed on the rabble. The drain pan of the drainage sifter is supplied with a curvilinear launder. The launder is passing along the course of rotation of the rabble into the zone of separation. An internal wall of the body and the ring-type cleaver-pusher form the zone of separation. The diameter of the cleaver-pusher makes 0.2-0.4 of the diameter of the cylindrical part of the body. Depth of its immersing in suspension concerning to the level of overflow makes 0.3-0.5 m. The drainage sifter is displaced relatively to the axis of the rabble rotation and is installed under the receiving box of the outside airlift. The technical result is an increase and stabilization of a density of suspension in the zone of separation.

EFFECT: the invention ensures an increase and stabilization of a density of suspension in the zone of separation.

3 cl, 2 dwg, 1 ex

 

The invention relates to techniques for mineral processing and is intended to improve the quality of the heavy fraction obtained in cone dense medium gravity separator by increasing and stabilizing the density of the slurry in the separation zone.

On the basis of practical data it is known that the difference in density of the suspension of the upper and lower layers in cone and other dense medium gravity separators with a deep bath ranges from 0.2 g/cm3to 0.4 g/cm3depending on the composition weight, the intensity of the circulation and depth of the bath.

To slow down the process of separation of the suspension and improve its resistance can be used weighting with a high content of fine particles, but it leads to deterioration of the rheological properties of the separation medium (by increasing its viscosity) and lower quality end products.

A large number of the most valuable fine particle filler is lost in the cycle of regeneration. The most significant increase in the loss of weight is observed when using the suspension high density of 3.3 g/cm and above)when you want to keep it high volume content of filler and you want to apply for consolidation of special devices.

Given the high cost of ferrosilicon (about 1 thousand dollars per 1 ton), it's lost things is a significant decrease economic efficiency of the process dense medium gravity separation, therefore, the solution to the problem of increasing the density and stability of the suspension without reducing its rheological properties is a problem is very urgent.

Known dense medium gravity separator (see AC No. 509291, M CL2In 03, 5/30, 1976), which includes housing, coaxially mounted airlift drive with a stirrer and a pulsator, which increase the stability of the suspension and stabilization of its density over the entire volume of the separator is carried out by forcing the maintenance of filler particles in a suspended state by pulsing (ascending and descending) flows throughout the volume of the dense medium gravity separator.

This is achieved in that the separator is equipped with a pulsator, which is connected by an air line with an annular space formed between the air pump and agitator.

The disadvantages of this design is the high energy intensity of oscillations of a large inert mass, to a very large dynamic loads on the bearing structures of the building and the inability due to fluctuations in the separation medium to raise its density.

Known cone dense medium gravity separator (see AC No. 1273161, CL 03, 5/30, 1985), which essential features adopted for the prototype, including the housing, the agitator with drive, air lift, drain screen with pan, the camera with the blades mounted on volumechange and located in the stagnant zone of the separator, where drained the roar of a dense suspension from the lower layers of the separator in a stagnant (dead) Central zone.

Empirically determined that the area is dead (stagnant) area, in which there is intense stratification of the suspension due to the low peripheral speed of rotation of the agitator, located in the Central part adjacent to the axis of rotation of the agitator and is from 0.15 to 0.30 square mirror separation of the bath (or 0.2-0.4 of its diameter)and the depth of the separation zone, in which the light fraction POPs and heavy sinking is 0.3-0.5 m

The disadvantage of this construction is that the resulting natural stratification tighter suspension, acting in the stagnant zone, quickly it exfoliates, not having time to get into an annular separation zone located between the stagnant zone and the inner wall of the housing baths, where the separation process of the material density.

This is because at low speeds of rotation of the agitator, and hence the camera with blades (industrial separators these speeds range from 3 to 10 rpm, depending on the diameter of the separating bath) the effect of additional blades, mounted on the camera, very small and insufficient to eject a dense suspension of stagnant (dead zone) and in practice the automatic does not have a significant effect on the density of the suspension in the separation zone.

The problem is solved in that the conical dense medium gravity separator comprising a casing, air-lift, drive with a stirrer and drainage rumble with the pallet, Central dead zone is separated from the separation zone annular baffle mounted on the stirrer, and the sump drain screen is equipped with a curved chute aimed in the direction of rotation of the agitator in the separation zone is the annular space between the baffle and the inner wall of the housing baths.

The problem is solved also by the fact that the diameter of the bump is equal to 0.2 to 0.4 of the diameter of the cylindrical part of the body separating tub, and the depth of his immersion in the suspension is 0.3-0.5 m

The task contributes to the fact that drainage rumble offset from the axis of rotation of the agitator. This allows to increase the useful area of the drainage and the amount of slurry flowing into the separation zone.

Structure and working principle of cone dense medium gravity separator according to the invention illustrated by the drawings, which depict:

Figure 1 - cone dense medium gravity separator in the incision;

Figure 2 - the same separator, type A (in plan in figure 1).

Cone dense medium gravity separator (see figure 1 and 2) includes a housing 1, a mixer 2, the actuator 3, the air pump 4 with the receiving box 5 for discharging heavy fraction, estrus 6 to download the source material is and circulating suspension, the tray 7 for discharging the light fraction, drainage rumble 8 tray 9, provided with a curved groove 10 and aimed in the direction of rotation of the agitator, the annular baffle 11, fixed wing agitators, estrus 12 for receiving the heavy fraction.

The cone dense medium gravity separator is as follows.

After the drive enable mixer 2 through the chute 6 is fed heavy suspension, the density of which is intermediate between the densities of the light and heavy fractions of shared material.

As you fill the cone suspension is its stratification, resulting in its density in the upper layers of the separation of the bath is reduced, and at the bottom increases.

When compressed air in the air pump 4 more dense slurry from the bottom of the cone rises in the receiving box 5 and further to the roar 8, where the drainage and return through the tray 9, and a curved chute 10 in the separation zone, the inner wall of which is a circular bump 11 and the outer - inner wall of the housing 1.

After filling of the separator suspension to the level of its overflow into the tray 7 is included filing enriched source material in the feed chute 6, located tangentially with respect to the outer annular wall of the bath, where the separation process of starting material n the light and heavy fractions. Light fraction POPs up and under the action of the circular flow generated by the stirrer and drained suspension directed curvilinear tray in the zone “K”, is transported to the tray 7 on unloading.

Heavy fraction sinks to the bottom of the cone together with a dense suspension of the airlift 4 rises to a roar 8. The suspension on the grid screen drains, flows into the sump and forth along a curved chute returns to the ring area and it increases the density separation, which improves the quality of the concentrate (heavy fraction)because it reduces the likelihood of hitting it (downstream) large pieces of light fraction.

Example

Cone dense medium gravity separator made according to the present invention has the following design characteristics:

the base diameter of the cone (mirror separation baths) - 1.5 m;

- the diameter of the bump - 0.5 m;

the depth of the bump relative to the drain of the threshold - 0.35 m;

- pipe diameter airlift - 0.15 m;

- area screening of the drainage roar - 0.8 m2;

- speed stirrers - 9 rpm

The offset of the axis of the drainage roar and airlift relative to the axis of rotation of the stirrer - 0.6 m, which ensures ease of operation of the drive agitator, and airlift, and also allows you to increase the useful area of the drainage is on screen, without increasing the dimensions of the dense medium gravity separator.

When the work specified separator for chromite ore Sopcheozerskoe field was used ferrosilicate suspension density of 3.5 g/cm3, the annular baffle and curved chute were first removed, and the densified slurry supplied to the Central part of the mirror separator.

As a result of natural stratification of the density of the suspension in the upper part of the separator at a depth of about 100 mm was 3.3 g/cm3and at the bottom - 3.7 g/cm3.

After installing the annular bump to a depth of 0.35 m and a curved trough was formed annular separation zone, the inner diameter of which was 0.5 m, and the outer - about 1.5 meters

As a result, the density of the suspension in the separation zone at a depth of 100 mm increased up to 3.45 g/cm3that allowed us to get better concentrate the heavy fraction (the content of CR2About3it increased from 38% to 42%).

Thus, the use of the present invention has enabled to improve the quality of the concentrate without increasing the volume content of filler in the suspension and, consequently, reduce its rheological properties. This significantly improved the conditions of operation and maintenance of major components of the separator.

1. Cone dense medium gravity separator, vlachoutsicos, drive, airlift reception box, drainage rumble with the pallet and the mixer, wherein the separation zone is separated from the dead (stagnant) area of the annular baffle mounted on the stirrer, and the sump drain screen is equipped with a curved chute aimed in the direction of rotation of the agitator in the separation area formed by the inner wall of the housing and the annular bump.

2. Cone dense medium gravity separator according to claim 1, characterized in that the diameter of the bump is equal to 0.2 to 0.4 of the diameter of the cylindrical part of the body, and the depth of his immersion in the suspension relative to the drain of the threshold is 0.3-0.5 m

3. Cone dense medium gravity separator according to any one of claims 1 and 2, characterized in that the drain roar offset from the axis of rotation of the stirrer and placed under selection box outside airlift.



 

Same patents:

The invention relates to gravity extraction of useful components when gidrogenizirovannoe the development of placer deposits and weathering crusts

Gravity separator // 2193452
The invention relates to the field of enrichment material, in particular the enrichment of ores and placers by wet gravity separation in the flow of the slurry flowing along the inclined working surface, and also to separate the different dry granular materials in grain density

The invention relates to the field of mineral processing, in particular the enrichment of ores and placers by wet gravity separation in the flow of the slurry flowing along the inclined working surface

The invention relates to a device for the extraction of gold and platinum-containing Sands and can be used in the devices for cleaning of water bodies, as well as in construction and other sectors of the economy

FIELD: mining industry; devices for minerals dressing using a method of heavy minerals separation.

SUBSTANCE: the invention is pertinent to mining industry, in particular, to devices for minerals dressing using a method of heavy minerals separation. The heavy minerals cone separator includes a body, a drive, an airlift with a receiving box, a drainage sifter with a drain pan and a rabble. A zone of separation is partitioned from a stagnation zone by a ring-type cleaver-pusher. The cleaver-pusher is fixed on the rabble. The drain pan of the drainage sifter is supplied with a curvilinear launder. The launder is passing along the course of rotation of the rabble into the zone of separation. An internal wall of the body and the ring-type cleaver-pusher form the zone of separation. The diameter of the cleaver-pusher makes 0.2-0.4 of the diameter of the cylindrical part of the body. Depth of its immersing in suspension concerning to the level of overflow makes 0.3-0.5 m. The drainage sifter is displaced relatively to the axis of the rabble rotation and is installed under the receiving box of the outside airlift. The technical result is an increase and stabilization of a density of suspension in the zone of separation.

EFFECT: the invention ensures an increase and stabilization of a density of suspension in the zone of separation.

3 cl, 2 dwg, 1 ex

FIELD: mining engineering; mechanics.

SUBSTANCE: gravity concentrator includes a conical chamber with downward facing cone vertex, a central pulp charging tube, which can rotate in said chamber, a nozzle to supply water into lower part of said chamber, and containers to collect light and heavy fractions of material. Concentrator is equipped with a perforated conveyor worm, which is rigidly connected with said central tube and provides for bottom-up pulp transfer within chamber. Nozzle is positioned coaxially with said central tube to create loosening fluid flow, which passes through splitter and filter in the direction opposite to that of the pulp delivered from said tube.

EFFECT: improved efficiency of valuable heavy fraction extraction, improved concentrator throughput.

2 dwg

FIELD: mining.

SUBSTANCE: invention relates to the field of minerals concentration, in particular concentration of ores and alluvial deposits by means of their wet gravitation separation in flow of pulp that flows along inclined working surface. Separator includes feeder and at least two double-level stages of separation, in each level of which the following components are serially arranged along vertical axis - pulp distributor, working surface in the form of tilted cone-shaped surface, unloading unit with splitter, besides unloading unit comprises outputs of heavy and light fractions, and lower perimetres of working surfaces in levels of all double-level stages of separation are arranged as identical. In each double-level stage of separation perimetre of upper part of working surface of lower level is less than perimetre of upper part of working surface of upper level.

EFFECT: increased efficiency of separation.

3 cl, 2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to dressing of minerals, in particular, gold bearing sands. Proposed method comprises tangential feed of pulp into top working zone, forming pulp flow swirled crosswise and vortex flows inside chutes over their entire length wherein, at centrifugal forces acting on mineral particles, they are classified to density. Heavy particles are precipitated on inclined bottom of chutes to roll downward to make concentrate while light particles flow off the chute in swirling pump flow in tails. Intercone space is formed by setting limiting cone coaxially with concentrator cone. Said intercone space thickness is adjusted to maintain constant centrifugal force. Additionally, water is fed into intercone space working zone top part to form pulp and water flow swirling crosswise. Proposed apparatus comprises conical concentrator with cone-shaped working chamber with radially narrowing chutes, branch pipe for tangential feed of pulp and separation products unloading means. Said concentrator is furnished with limiting cone arranged coaxially with working chamber with adjustable clearance from chute wall edges. It comprises also water tangential feed branch pipe and pump feed branch pipe arranged at working chamber top section. Tail unloading means represent circular deflector arranged at cone bottom section coaxially with concentrate discharge opening.

EFFECT: higher efficiency of separation.

2 cl, 1 dwg

Up!