RU2558872C1 - Method of dry dressing of coal - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention relates to mineral processing by fineness and density, in particular to coal dressing. The method of dry dressing of coal includes supply of raw coal to the device of separation of coal from rock. The device for separation of coal from rock is designed as, at least, one rotational brush implemented as a rotating drum installed by the axis along the flow of raw materials with the pile fixed on its cylindrical surface. The separation of coal from rocks is executed by rotation of the rotational brush with providing of action of brush pile on raw materials and sweeping away of coal particles, which are lighter that rocks. Raw materials are supplied by a transport band of the tape conveyor, the drum with pile on external cylindrical surface is used which is installed above the transport band. The gutter-shaped transport band is used. A hollow drum with pile on its internal surface is used the axis of which is arranged at a minimum angle 45° to the horizon and inside which along the axis the tray for reception of coal particles is located, and the raw materials are supplied to the internal surface of the drum.

EFFECT: increase of productivity of the process, and also decrease of energy consumption for implementation of the offered method.

4 cl, 3 dwg

Description

The invention relates to the mining industry, and in particular to the enrichment of minerals by size and density, in particular to the enrichment of coal.

A known method of dry coal beneficiation, including the uniform location of the rock mass on a conveyor belt, the conveyor belt of which is made with longitudinal grooves extending in the longitudinal direction of the conveyor belt, a particle loading unit, a unit for unloading a fine fraction of particles, and a unit for unloading a large fraction of particles above which x-ray machine. The X-ray apparatus detects at what point in the conveyor a rock particle is located, and at which - coal particles, and transmits information to an actuator consisting of a series of small air nozzles. The computer controls these nozzles to “blow off” coal particles (RU 2422210 C1, publ. 06/27/2011). This method is complicated in execution, has high operating costs and is dangerous to the health of staff.

Closest to the proposed is the method implemented by the installation of pneumatic separation, according to which pre-graded by size products are fed into the feeder. The feeder ensures the distribution of products on the conveyor belt with a uniform layer in width and height. Products moving along the conveyor fall under the nozzles mounted above the belt. Lighter material particles are drawn in by nozzles, heavier particles remain on the conveyor belt and are removed from under the nozzles. Particles drawn into the nozzle through the nozzle collector enter the precipitation chamber. Product trapped in the settling chamber is removed using the device. The dust contained in the products is captured by the dust collection system 6 (RU 78703, publ. 10.12.2008).

The disadvantage of this method is the presence of operations that excludes the proposed method, so in the known method, in addition to moving the material along the mesh conveyor, there is also the suction of light fractions by air, then their removal from the air stream using cyclones, then air purification.

The objective of the claimed invention is to reduce energy costs for the implementation of the method since, compared with the closest analogue, the number of operations is reduced (in fact there are only two of them: moving the material and the brush), so there is no need to create an air flow that can lift stones, as well as significantly reduced energy costs for brush rotation.

The problem is solved in that in a method for dry coal beneficiation, comprising supplying coal raw materials (a mixture of coal and rock (stones)) to a means for separating coal from rock, with which separation is carried out, according to the invention, using at least one rotational brush, made in the form of a rotating drum installed with its axis along the movement of raw materials with a pile fixed to its cylindrical surface, and coal is separated from the rock by rotating the company ionic brush secured exposure lint brush for raw materials and sweeps the coal particles that are lighter than pieces of rock.

The bristles of the brush on the one hand create a balanced environment (like water and air in classical enrichment schemes), but unlike the latter, they are very easily removed from this medium, which helps to reduce the number of operations of the method.

In the particular case of the method, the supply of raw materials is carried out on a conveyor belt of a conveyor belt, while using a drum with a pile on an external cylindrical surface mounted above the conveyor belt.

To increase the convenience of transporting raw materials, a conveyor belt having the shape of a gutter is used. In this case, the rotary brush is located with its lower part in the specified trough.

In another particular case, a hollow drum with a pile on its inner surface is used, the axis of which is located at an angle of at least 45 ° to the horizon and inside of which there is a tray for receiving coal particles along the axis, while the feed is supplied to the inner surface of the drum.

The proposed method has a low energy intensity and high productivity of the process. The claimed method is simple to implement. Its implementation requires low capital costs. Moreover, the enrichment quality of the proposed method is high, especially when using several rotational brushes.

The essence of the proposed solution is illustrated using graphic materials.

In FIG. 1 shows a conveyor with a rotational brush mounted above it, used in the method described in dependent claim 2 of the formula; in FIG. 2 shows a cross-section of a conveyor with a rotary brush mounted above it, used in the method described in dependent claim 3 of the formula; in FIG. 3 shows an embodiment of a rotary brush used in the method described in dependent claim 4.

The proposed method of dry coal beneficiation involves the supply of coal raw materials 1 to the means for separating raw materials into coal 6 and rock 7. As such a tool, a rotary brush is used, made in the form of a rotating drum 2 with a pile 3 fixed to its side cylindrical surface.

The supply of raw materials 1 is carried out by a narrow path along the transport tape 4 of the conveyor belt. Preferably, the conveyor belt 4 is in the form of a chute due to the fact that it is mounted on the daisy roller bearings 5. The drum 2 is mounted above the belt 4 so that the pile 3 interacts with the raw material 1 when the drum 2 rotates (see Figs. 1 and 2).

In the particular case of the method, the raw material 1 can be fed by gravity (at an angle of at least 45 °) into the inner cavity of the drum 2, on the inner surface of which a pile 3 is fixed (see Fig. 3). The axis of the drum 2 is located at an angle to the horizon of at least 45 °.

In all cases, the stiffness of the pile 3 and the feed rate of the raw material 1 are selected in such a way as to ensure the separation of coal particles 6 from the rock 7.

In the particular case of the method, when the rotary brush is mounted above the belt conveyor (see Figs. 1 and 2), the effort of the pile 3 when rotating the drum 2 is sufficient to remove relatively light particles of coal 6 from the belt 4 of the conveyor, but not to move relatively heavy particles rocks 7. For accuracy of separation, several rotational brushes can be arranged sequentially along the line 4 of the conveyor.

In the particular case of the method, when the rotation brush is made in the form of a hollow drum 2 with a pile 3 fixed on its inner surface (see Fig. 3), the loading of raw materials 1 is carried out by gravity along the inclined loading tray 8. The raw material enters the cavity of the rotating drum 2, at the same time, pile 3 first captures 100% of the raw material, but with an increase in the angle of elevation, the heaviest particles of rock 7 push through the fibers and spill back into drum 2. Relatively light particles of coal 6 captured by the pile 3 of the brush fall into the discharge tray 9 for light fraction located in the cavity of the drum 2 along its axis.

Claims (4)

1. The method of dry enrichment of coal, including the supply of coal raw materials to the means of separating coal from the rock, using which carry out the separation, characterized in that as a means of separating coal from the rock using at least one rotary brush, made in the form set the axis along the movement of the raw materials of the rotating drum with a pile fixed on its cylindrical surface, and the separation of coal from the rock is carried out by rotating the rotary brush with the effect of the brush pile on the raw materials and estimates coal particles lighter than pieces of rock. 2. The method according to p. 1, characterized in that the feed is carried out on a conveyor belt of a conveyor belt, while using a drum with a pile on the outer cylindrical surface mounted above the conveyor belt. 3. The method according to p. 2, characterized in that they use a transport tape having the shape of a gutter. 4. The method according to p. 1, characterized in that they use a hollow drum with a pile on its inner surface, the axis of which is located at an angle of not less than 45 ° to the horizon and inside which there is a tray for receiving coal particles along the axis, while the feed is carried out on the inner surface of the drum.

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