RU2671371C1 - Complex for receiving concentrate - Google Patents

Abstract

FIELD: mining.SUBSTANCE: invention relates to the mining and metallurgical industry and directly to the complexes for unloading, mixing, transporting and averaging to the specified characteristics of the concentrate, in particular, in the production of pellets. Complex for receiving the concentrate consists of an ore-breaking plant, a hull with a car dumper, under which a grid is placed to form a certain size of the pieces of concentrate, a receiving hopper, transport systems for moving the concentrate. In the body with the car dumper, a vibrating disc is installed to loosen the consolidated zones of the concentrate, receiving hopper, made in the form of a receiving container for wet averaging of the concentrate, a mixer with a propeller, a collector for water supply, transport systems made in the form of pumps, pipelines and a sump. Receiving capacity is made in the form of a truncated cone and is installed inside a ferroconcrete sump, which carries construction load from the equipment, and also performs the function of emergency capacity. Lattice for forming a specific size of the pieces of concentrate and excluding clogging is made of rods and plates so that the cell size formed by the rods is smaller than the cell size formed by the plates.EFFECT: obtaining a concentrate of maximum uniformity.3 cl, 2 dwg

Description

The invention relates to unloading, mixing, transportation, averaging to the specified characteristics of the concentrate, in particular, in the production of pellets. The invention can find application in mining, metallurgical and other industries.

There is a method (selected as a prototype) of the reception of raw materials in railway cars from mines to sinter plants. Before arriving at the sinter plant, trains are passed in winter through greenhouses to defrost ore. Natural moisture sinter ore freezes near the walls of wagons, usually after 2-3 hours of transportation in the cold. Transportation of ore in freezing weather during the day is sufficient for the formation of a continuous ore monolith in the entire carriage volume. In covered reinforced concrete sheds-heaters, cars with ore are heated by combustion products of blast furnace gas. The combustion products are diluted with cold air and moved with a smoke exhauster through the cars defrosting chambers into the chimney. The car thus prepared for unloading is immediately sent to the car dumper for unloading. Rotor-type car tippers are installed at sinter factories, which allow unloading ore from cars directly under the tipper into the receiving hoppers of the factory. The raw material unloaded from the car enters the bunker under the car dumper, from where it is loaded onto the conveyors of the sinter plant through the bunker shutter. Above the bins, control gratings with square cells of 200 × 200 mm are installed. Lattices are rails welded at intersections. Lattices do not allow too large blocks to enter the hoppers and ensure safe operation. Each hopper is equipped with a plate feeder, with the help of which the raw material is gradually supplied to the conveyor belts transporting materials to the raw material warehouse. The warehouse of the components of the mixture is being built to create stocks of raw materials and averaging the composition of incoming materials. The basic principle of averaging in warehouses is that the formed multilayer stack is then unloaded by the excavator from the ends opposite to the stack so that the ore will get into one bucket from all layers, if possible. The result of the averaged warehouse is an improvement in ore uniformity. Averaged ore and other components are conveyed by conveyor belts to the charge department of the sinter plant (Ore and concentrate ore dressing. EF Vegman Textbook for technical schools - 3rd ed., Revised and enlarged M: Metallurgy, 1984, p. 176- 180).

The disadvantages of this prototype are the presence in a large number of lump fraction, which is stuck in the body of the lattice. After defrosting, because of its moisture content, the concentrate hangs on the walls of the hopper, it sticks to the belts of feeders and conveyors, spills of concentrate form during transportation. The difficulty of mixing concentrates with various physical and chemical characteristics negatively affects the further production process and the quality of, for example, pellets.

The technical result of the invention is the creation of a complex for receiving concentrate, which is necessary for the production technology, for example, pellets from iron ore concentrate from various manufacturers. In addition, the invention allows to achieve maximum uniformity of the concentrate when it is averaged.

The indicated result is achieved by the fact that the concentrate receiving complex (Fig. 1) consists of an ore-freezing installation (pos. 1), a hull (pos. 2) with a dumping car (pos. 3) placed in it for unloading the concentrate from railway gondola cars, and an electric bridge a crane (pos. 4) for installation, repair of equipment and operation of a vibrating ripper (pos. 5) for loosening the compacted zones of concentrate in a gondola car or on a grate (pos. 6) installed under the car dumper (pos. 3), consisting of rods (pos. 7 ), plates (pos. 8) (Fig. 2a), for forming a concentrate of a certain size pieces, a uniform distribution over the area of discharge and to prevent foreign objects. To prevent clogging of pieces of concentrate in the body of the lattice (item 6), the size of the cell at the inlet formed by the rods is smaller than the size of the cell at the outlet formed by the plates. In addition, when frozen blocks of concentrate fall, they hit the rod. Contact occurs along the line (Fig. 2b). This creates the greatest destructive force in comparison with the above prototype, where the lattice is made of rails and contact when struck occurs along the plane (Fig. 2B). Also, the destroyed block of concentrate completely wakes up and does not remain on the surface of the rod (pos. 7), as it happens in the prototype on a flat surface of the rail. The plates (pos. 8) act as stiffeners. Shock absorbers (pos. 9) (Fig. 2a) are installed on two sides of the grill (pos. 6) (Fig. 1) to reduce the shock load on the grill and building structures when the concentrate drops from the gondola car. On three sides of the grill (pos. 6) there are hydraulic monitors (pos. 10) for cleaning the gondola and the grill (pos. 6). Below the grate (pos. 6) there is a receiving tank (pos. 11), made in the form of a truncated cone with inclined walls, which allow dispersing the discharge concentrate over a larger area and improving the mixing process due to its contact with oncoming flows of hydraulic mixtures (pulps), a mixer (pos. 12) with a propeller (pos. 13), a collector (pos. 14) for supplying water with which the concentrate is mixed to a certain pulp density.

The receiving tank (pos. 11) is located inside the reinforced concrete sump (pos. 15), which in case of emergency will prevent flooding of the pump room (pos. 16) and is the supporting structure for the tipper (pos. 3), grate (pos. 6) and the mixer (Pos. 12).

At the base of the receiving tank (key 11), suction pipes (key 17) are installed. In the pump room (pos. 16), a sump (pos. 18) with drainage pumps (pos. 19, 20) and their discharge pipelines (pos. 21, 22), circulation pumps (pos. 23), densitometers (pos. 24), flow meters (pos. 25), valves (pos. 26), a discharge valve (pos. 27) and pumps (pos. 28) for supplying slurry through discharge pipelines (pos. 29) located on the overpass (pos. 30) ), into the transfer case (pos. 31) into the junction box (pos. 32) of the tank (pos. 33) for mixing and obtaining the necessary characteristics of the concentrate from different enrichment technologies, and pumping the pulp (pos. 36) to the roasting machine No. 3. For pumping pulp and preparing concentrate for roasting machines No. 1; No. 2 in the transfer case (pos. 31), valves (pos. 34), a pipeline (pos. 35) are installed, and in the enrichment case (pos. 37), a junction box (pos. 38) is located near the tank (pos. 39), valves (key 40), pumps (key 41), and piping (key 42).

The complex for the reception of the concentrate works as follows.

The received concentrate in gondola cars enters the ore defrosting unit (item 1) (Fig. 1), where the frozen concentrate is heated in the winter period. The heat carrier for heating the concentrate is the products of natural gas combustion. Further, gondola cars with concentrate are transferred to the hull (item 2) with a car dumper (item 3), an electric bridge crane (item 4), a vibrating ripper (item 5). Loosening of caked or residues of frozen concentrate is carried out with a vibrating ripper (item 5). The vibrating ripper (pos. 5) works in conjunction with an electric bridge crane (pos. 4), with which it is installed on the upper harness of the gondola and, if necessary, on the grill (pos. 6).

Gondola car with thawed and loosened concentrate is fed to the platform of the car dumper (pos. 3), located in the body (pos. 2). When the turning mechanism of the car dumper (Pos. 3) is turned on, the gondola is rotated around its longitudinal axis by a maximum of 175 degrees and the concentrate is poured onto the grate (Pos. 6) to form a certain size of pieces of concentrate, its uniform distribution over the unloading area and to prevent foreign objects from getting in. Through the grill (pos. 6), the concentrate wakes up in a receiving tank (pos. 11) for mixing with water.

Above the grate (pos. 6), to remove residual concentrate from gondola cars after unloading and cleaning the grate, washing devices in the form of hydraulic monitors were installed (pos. 10). For supplying hydraulic monitors with flushing medium, process water is used.

In the center of the receiving tank (pos. 11), the propeller (pos. 13) of the agitator (pos. 12) rotates, which throws the pulp towards the bottom of the receiving tank (pos. 11) and creates pulp circulation over all surfaces, volume and averages it. A collector (pos. 14) is installed above the receiving tank (pos. 11), which supplies water to mix it with the concentrate. The first filling of the tank (0.7 working volume) is carried out with water, then the concentrate is added, gradually bringing the pulp density to the necessary parameters.

Circulation pumps (pos. 23) ensure the movement of the pulp from the receiving tank (pos. 11) along a closed circuit and return it to the receiving tank (pos. 11) for additional mixing and control of the pulp density with densitometers (pos. 24). The reinforced concrete sump (pos. 15) accepts the building load from the car dumper (pos. 3), the grill (pos. 6) and the mixer (pos. 12), and also prevents flooding of the pump room (pos. 16) during emergency discharge of pulp from the receiving tank (Pos. 11).

The sump (pos. 18) accepts drainage drains, technical flushes, and also serves to completely empty the receiving tank (pos. 11) from the discharge valve (pos. 27). The drain pump (key 19) through the discharge pipe (key 21) directs the pulp to the receiving tank (key 11), and the drain pump (key 20) through the discharge pipe (key 21), which is located on the overpass (pos. 30) directs the pulp into the transfer case (pos. 31) into the junction box (pos. 32), from which the pulp is transferred to the tank (pos. 33).

Using pumps (pos. 28), the pulp from the receiving tank (pos. 11) by discharge pipelines (pos. 29), with its density measured using densitometers (pos. 24) and flow rate by flow meters (pos. 25) along the overpass (pos. 30) the overhead communications is fed into the transfer case (pos. 31) into the junction box (pos. 32), from which the pulp is transferred to the tank (pos. 33) and sent by pumps (pos. 36) to the roasting machine No. 3. In the transfer case (pos. 31), blocking the pulp flows with valves (pos. 34), it is redirected to the pipeline (pos. 35) and then to the enrichment case (pos. 37) to the junction box (pos. 38) and to the container (pos. . 39), from which, by opening the valves (pos. 40), the pumps (pos. 41) through pipelines (pos. 42) pump the pulp for roasting machines No. 1; No. 2.

Claims (3)

1. Complex for receiving concentrate, consisting of an ore-freezing installation, a body with a car dumper, under which there is a grate for forming a certain size of pieces of concentrate, a receiving hopper, transport systems for moving the concentrate, characterized in that a vibrator for loosening up the compacted zones is installed in the body with a car dumper concentrate, receiving hopper made in the form of a receiving tank for wet averaging of concentrate, mixer with propeller, collector for water supply , Transport systems, designed as pumps, conduits and sump. 2. The complex for receiving the concentrate according to claim 1, characterized in that the receiving tank is made in the form of a truncated cone and is installed inside a reinforced concrete sump that carries the building load from the equipment and also acts as an emergency tank. 3. The complex for receiving the concentrate according to claim 1, characterized in that the lattice for forming a certain size of pieces of concentrate and eliminating clogging is made of rods and plates so that the cell size formed by the rods is smaller than the size of the cell formed by the plates.

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