RU72877U1 - MODULAR CONCENTRATION INSTALLATION - Google Patents

Abstract

The utility model relates to the beneficiation of minerals, in particular, to mineral processing equipment, and can be used in mineral processing devices for separating raw gold from gravity gold-bearing concentrates, and separating bulk ore by density. Objective: to improve the modular concentration plant, by eliminating the process of floccule formation in the feedstock, to ensure the optimal pneumatic separation mode, in which particles of the separated material are in a fluidized state above the pneumatic separator grid. SUBSTANCE: modular concentration plant contains a frame on which modules are mounted one below the other, each of which consists of a pneumatic separator in the form of a vertically arranged housing with a loading device, a main sieve located in the housing, lower and upper nozzles with air distributors under and above the main sieve , and receivers of the useful component of light and heavy fractions. Each module contains an additional sieve, located in the housing under the main sieve, the loading device is made in the form of a vibrating screen with a guide of the under-screen product to the screen of the next module, while the screen is paired with the main screen of the air separator and have a common carrier element rigidly connected to the frame, which is mounted on flexible supports, the additional sieve has an arcuate shape and convex to the main sieve, which is reinforced with removable cantilever rods from a magnetic material la, the size of the vibrating screen is taken as the cell size of the primary mesh, a mesh size equal to the size of the vibrating screen in each subsequent cell module is determined from the expression:

Where:

d _i - cell size of the main sieve and vibrating screen of the i-th module;

d _{i + 1} - cell size of the main sieve and vibrating screen of the subsequent module;

γ ₁ is the grain density of the useful component;

γ ₂ is the grain density of the empty inclusions.

Effect: increase the efficiency of separation. 1 n.p. f-ly, 4 ill.

Description

The utility model relates to mineral processing, in particular, to mineral processing equipment, and can be used in processing devices for the separation of raw gold from gravity gold-bearing concentrates, the separation of bulk ore by density, and also in agriculture for the separation of grain by density.

A known module of a concentration plant containing a frame on which a module is mounted containing a sieve in the form of a deck, an air supply pipe under the deck with an air distributor and finished fractions receivers (see Russian patent for invention No. 2071382 C1, IPC V03B 4/00, publication date 1997.01.10 .).

The disadvantage of this design is the uneven density of the air flow in the separation zone through the mesh deck, which will move solid particles along different trajectories. As a result, the divided bulk medium in density will have relative clogging. To obtain a high-quality product, it is necessary to repeatedly introduce it into the enrichment process.

Another disadvantage is the fact that for the constant removal of the heavy fraction it is necessary to create a more powerful air stream that would be able to lift these heavy particles and move them from the deck to the drives, which is very difficult for this design without air flow stabilizers over the entire deck area. As a result, this leads to increased energy consumption for separation and additional losses of the heavy fraction, which can be removed due to uneven air flow in the separation zone.

The closest analogue to the claimed utility model in terms of the set of features and the technical result achieved is a concentration plant module containing a frame on which an air separator is mounted, i.e. a pneumatic separator in the form of a vertically arranged housing with a loading device, a main sieve located in the housing, an air supply pipe under a sieve with an air distributor, a dust-shaped fraction outlet pipe with an air distributor in its upper part and finished fractions receivers (see AS for invention of the USSR No. 1646624, IPC В07В 4/05, 05/07/91. Bull. No. 17).

The main disadvantage of this pneumatic separator is the low separation efficiency and is due to the fact that the separation of the feedstock comes in a certain fraction, which is pre-prepared, stored and kept on demand for pneumatic separation. With preliminary separation, i.e. preparing bulk feed for certain fractions, it happens like this

called tribo-loading of particles, in particular 0.1 mm particles, contributing to their coalescence. The longer the time gap between the process of separation of particles and the process of pneumatic separation, the more intense is the adhesion of particles and the formation of flocs. Such feedstock entering pneumatic separation requires an increase in the power of the air flow in order to ensure that the particles are above the grid of the pneumatic separator in a fluidized state. Otherwise, the grid of the pneumatic separator will become clogged with a heavy and fine fraction, which leads to a decrease in the separation efficiency. To eliminate this drawback, it is necessary to increase the power of the air flow, which will lead to a significant increase in energy consumption.

The utility model is based on the task of improving the modular concentration plant, by eliminating the process of floccule formation in the feedstock, to ensure the optimal pneumatic separation mode, in which particles of the separated material are in a fluidized state above the pneumatic separator grid, and thereby increase the separation efficiency.

The problem is solved in that in a modular enrichment plant containing a frame on which modules are mounted one below the other, each of which consists of a pneumatic separator, in the form of a vertically arranged housing with a loading device, a main sieve located in the housing, lower and upper nozzles with distributors air under the main sieve and above it, and receivers of the useful component of light and heavy fractions, according to the utility model, each module contains an additional sieve placed in the housing under the main sieve ohm, the loading device is made in the form of a vibrating screen with a guide of the sub-screen product to the screen of the subsequent module, while the screen is paired with the main screen of the air separator and have a common bearing element, rigidly connected to the frame, which is mounted on malleable supports, the additional screen is curved and convex to the main sieve, which is reinforced with removable cantilever rods of magnetic material, the size of the vibrating screen cell is taken equal to the size of the cell of the main sieve, and the size cells of the main sieve, equal to the size of the cell of the vibrating screen, in each subsequent module is determined from the expression:

Where:

d _i - cell size of the main sieve and vibrating screen of the i-th module;

d _{i + 1} - cell size of the main sieve and vibrating screen of the subsequent module;

γ ₁ is the grain density of the useful component;

γ ₂ is the grain density of the empty inclusions.

The introduction of an additional sieve into each module, and placing it in the housing under the main sieve, ensures equalization of the density of the directed air flow over the entire cross section of the channel formed by the vertical housing above the main mesh and, due to this, create a uniform fluidized bed of the separated product over the main mesh and increase quality pneumatic separation.

The implementation of the loading device in the form of a vibrating screen, paired with the main sieve and their mounting on a common carrier element, rigidly connected with a frame mounted on compliant supports, eliminated the process of particles sticking together, flocculation and clogging of the air separator mesh with heavy and fine fractions, stabilize parameters of the process of pneumatic separation and, due to this, to increase the efficiency of pneumatic separation.

Reinforcing the main mesh with removable cantilever rods made of magnetic material is used to act on particles separated in the air stream, which increase the attraction of iron-containing particles and neutral sand particles, slag, which ensured an increase in the quality of the resulting product.

The establishment of the cell size of the main sieve equal to the size of the cell of the vibrating screen in each subsequent module according to the expression:

Where:

d _i - cell size of the main sieve and vibrating screen of the i-th module;

d _{i + 1} - cell size of the main sieve and vibrating screen of the subsequent module;

γ ₁ is the grain density of the useful component;

γ ₂ - grain density of empty inclusions,

allowed to reduce the number of enrichment stages, and as a result, the number of modules in the processing plant.

The essence of the utility model is illustrated by drawings, where:

figure 1 - presents a General view of a modular concentration plant;

figure 2 - modular concentration plant (top view);

figure 3 - modular concentration plant in cross section aa;

figure 4 - modular concentration plant in cross section along BB.

The modular concentration plant contains a frame 1 on which modules are mounted one below the other, each of which consists of a pneumatic separator in the form of a vertically arranged housing 2 with a loading device 3, a main sieve 4 located in the housing 2, lower 5 and upper 6 nozzles with air distributors 7, air under the main sieve 4 and above it, and receivers 9, 10 of the useful component of light and heavy fractions. Each module contains an additional sieve 11, located in the housing 2 under the main sieve 4.

The loading device 3 is made in the form of a vibrating screen 12 with a vibrodrive 13 and a guide 14 of a sub-product to the loading device 15 of the subsequent module. The vibrating screen 12 is mounted on the supporting element 16 of the frame 1 and is paired with the main screen 4 of the air separator. The main sieve 4 and the vibrating screen 12 are mounted on the said supporting element 16, which is rigidly connected to the frame 1. The frame 1 is mounted on flexible supports 17. The additional sieve 11 has an arcuate shape and convex to the main sieve 4. The main sieve 4 is reinforced with removable cantilever rods 18 from magnetic material. The size of the vibrating screen cell is taken equal to the size of the main sieve cell, and the size of the sieve cell equal to the size of the vibrating screen cell in each subsequent module is determined from the expression:

Where:

d _i - cell size of the main sieve and vibrating screen of the i-th module;

d _{i + 1} - cell size of the main sieve and vibrating screen of the subsequent module;

γ ₁ is the grain density of the useful component;

γ ₂ is the grain density of the empty inclusions.

The modular concentration plant operates as follows.

Pre-crushed feedstock is metered into a vibrating screen 12 of the loading device 3 of the first module. When this vibrating actuator 13 vibrating screen 12 in the on state. The feedstock under the influence of vibrating vibrations is simultaneously sifted and moves along the inclined surface of the vibrating screen 12. Since the vibrating screen 12 is paired with the main grid 4, the over-screen product falls onto the main grid 4, on which it undergoes pneumatic separation under the influence of the air flow directed in one direction under the main grid 4 and above it. The directed air flow under the main 4 and additional 11 mesh is created by means of an air distribution system 7 in the lower pipe 5 of the vertical casing 2 of the pneumatic separator. The directed air flow over the main grid 4 is created by means of an air distribution system 8 in the upper pipe 6 of the vertical casing 2 of the air separator. Due to the fact that the air distribution systems use fans to create a directed air flow, the air flow created by it, limited by the casing 2, has a significantly higher density on the periphery than in the central part. As a result, an uneven fluidized bed is created above the main mesh 4, which reduces the quality of the pneumatic separation. In this regard, between the main grid 4 and the air distribution system 7, an additional convex mesh 11 is placed that evens out the density of the air flow over the entire cross section of the channel formed

vertical casing 2. In the process of pneumatic separation, the product is divided into heavy and light fractions. Since the frame 1 is placed on compliant supports 17 and is rigidly connected with the supporting elements 16, on which the vibrating screen 12 and the main grid 4 of the pneumatic separator are placed and form a single interconnected structure, the vibrations of the vibrodrive 13 are transmitted to the elements of the mentioned interconnected structure. As a result, in each element of this design, its own vibration is excited with an amplitude different from the vibration amplitude created by the vibrodrive 13. Achieved at the same time, the vibration mode of the structural elements helps to stabilize the parameters of the pneumatic separation process, which ensures the efficiency of the modular concentration plant at all stages of enrichment of the feedstock.

In this mode of operation, the heavy fraction is formed in the lower layer, which is transported along the inclined main grid 4 to the heavy fraction receiver 9. The upper layer contains the light fraction, which is transported to the light fraction receiver 10.

The reinforcement of the main mesh 4 with removable rods 18 of magnetic material is used to act on particles separated in the air stream, which increases the attraction of iron-containing particles and neutral particles of sand, slag, thereby increasing the quality of the resulting product.

The sub-product, in turn, along the guide 14 is fed to the loading device 15 of the subsequent module, where the cell size of the main sieve 4 equal to the cell size of the vibrating screen 12 in each subsequent module is determined from the expression:

Where:

d _i - cell size of the main sieve and vibrating screen of the i-th module;

d _{i + 1} - cell size of the main sieve and vibrating screen of the subsequent module;

γ ₁ is the grain density of the useful component;

γ ₂ is the grain density of the empty inclusions.

The enrichment process in each subsequent module is carried out in a similar way.

Claims (1)

A modular enrichment plant containing a frame on which modules are mounted one below the other, each of which consists of a pneumatic separator in the form of a vertically arranged housing with a loading device, a main sieve located in the housing, lower and upper nozzles with air distributors under and above the main sieve , and receivers of the useful component of light and heavy fractions, characterized in that each module contains an additional sieve located in the housing under the main sieve, the boot is adapted It is made in the form of a vibrating screen with a guide of the sub-product to the vibrating screen of the subsequent module, while the vibrating screen is paired with the main screen of the pneumatic separator and have a common bearing element, rigidly connected with the frame, which is mounted on compliant supports, the additional screen has an arched shape and is convex to the main situation , which is reinforced with removable cantilever rods of magnetic material, the size of the vibrating screen cell is taken equal to the size of the main sieve cell, and the size of the sieve cell is equal to the size i the vibrating screen cells in each subsequent module are determined from the expression:

where d _i is the cell size of the main sieve and vibrating screen of the i-th module; d _{i + 1} - cell size of the main sieve and vibrating screen of the subsequent module; γ ₁ is the grain density of the useful component; γ ₂ is the grain density of the empty inclusions.