SU931756A1 - Flow line for preparing and feeding granular materials in the steel-casting production - Google Patents

Description

conveyors with unloading mechanisms, equipped with silos and successively installed feeders, reversible conveyors, intermediate bins, funnels, crushers and ball mill, operatively connected by means of an elevator, classifier and silos of pulverized materials with the installation of pneumatic transport, the latter being connected to the tank and storage and distribution of components during metal processing.

FIG. 1 shows the flow line to its entrance into the premises of the melting unit (converter), general view; in fig. 2 - a straight line (its continuation) from the entrance to the premises of the melting unit and its placement in the workshop; in fig. 3 - an element of the production line with the equipment of the site for the preparation and supply of pulverized materials (lime and fluorspar) for blowing them through the bottom of the converter.

The production line for the preparation and supply of bulk materials in steelmaking consists of railway tracks 1, under which are four rows of receiving bins 2 with feeders 3 installed under them. The first row of bunkers (Fig. 1) is intended for storing deoxidizers, fluorspar and shungizita. A conveyor 4 is located under this row of bunkers. The second and third rows of bunkers are intended for storing metal-containing components (ore, pellets). Conveyors 5 are located under these rows of bins. The fourth row of bins is intended for storing limestone. A conveyor belt 6 is located under this line.

On the conveyor 4, a self-propelled dumping trolley 7 is installed, and at its end there are crushers 8 with receiving hoppers, under which is placed the conveyor 9 with similar self-propelled dumping trolleys. Drying furnaces 10 and reversing conveyor I are located under this conveyor, under which loading conveyors 12 with dumping carriages pass, in the zone of action of which silos 13 are installed for storing material (deoxidizers, fluorspar, shungizite). In the places of unloading from silos, feeders are installed, and below them feed conveyors 14. Under the terminations of loading conveyors 12, transfer tanks 15 are installed for shipping ferroalloys to the side by motor transport (to other workshops, as required).

In the end part of the conveyor 9 are placed shipping bins 16 with additional conveyors 17, coming from the drying ovens. Under the shipping bins installed feeders and conveyor 18. Conveyors 5 and 18 are connected to the system of main conveyors 19.

The conveyor belt 6 is connected to the conveyor path 20 located above the silos 13 in the zone of a group of hoppers for storage of well-known goods. These conveyors also have self-propelled dumping carriages, and beneath the bins there are installed feeders located above the conveyor 21 connected by a conveyor system 22 to the limestone separation section 23. From the compartment there is a conveyor 24 for lime, under which is located a transfer bunker 25. At the outlet openings of the bunker there are feeders, and under them are two threads of conveyors 26.

At the end of the conveyors are located (Fig. 3) chutes 27, beneath them are reversible conveyors 28 moving over the force themselves 29. At the silo outlet openings, feeders 30, reversible conveyors 31, intermediate hoppers 32, funnels 33, crushers 34, conveyor 35 are installed in series. The conveyor is connected to a hopper 36, the conveyor system 37 of which is combined with a ball mill 38. The exit hole of the ball mill is connected to the input path to the elevator 39. The elevator is connected to the unloading path with the classifier 40, the output chutes of which are installed

5, respectively, for the pulverized fraction above the conveyor 41, and for the coarse fraction, are introduced into the hopper 36. The conveyor is connected to the hopper 42 For the pulverized materials, at the base of which a pneumatic conveying installation 43 is fixed, the latter being connected to the tanks 44 for storing and dispensing components during processing metal.

The delivery of components from the containers is also carried out by the pneumatic transport system.

Under the reversible conveyors 28, conveyors 45 are installed, going to the workshop (Fig. 2) with drop carts 46. The workshop has bins 47 with feeders 48 and weighing batchers 49 similar to those in the bulk material supply system (lime and others), and in the supply system deoxidizers. In the supply system of deoxidizers, along with their path, furnaces 50 are installed for calcination. Under the chutes of the weighing dosing units, assembled bunkers 51 with valves and similar chutes 52 of the material input into the converter 53 or into the ladle 54 are installed. Components are fed through the converter trunnions (Fig. 2) to blow through the tuyeres located in the bottom.

Flow line works as follows.

The materials arriving in railway cars using put 1, depending on their type, are unloaded into a certain row.

5 (from 1st to 4th) receiving bunkers 2.

From the first row where deoxidizers are stored, the latter with the help of feeders 3 are fed to conveyor 4. Deoxidizers

from the conveyor using a self-propelled dumping carriage 7 is fed to the crushers 8 and from them to the conveyor 9. At the same conveyor, deoxidizers can be dispensed through the end drum, the crusher’s mine, if the deoxidizing grain size distribution satisfies the melting technology. By this conveyor, deoxidizers with carts go to the furnaces 10 and from them via additional conveyors 17 to the shipping bins 16. If the deoxidizers are not needed, they are unloaded from the conveyor 9 to the reversing conveyor 11 and using dumping trucks load silos 13.

The deoxidizers can be fed through the end parts of the loading conveyors into containers .15 for subsequent shipment by truck for other needs of the plant. The deoxidizers found in the silos 13 are fed to the feed conveyors 14 with the help of feeders, and from them the material is fed to the conveyor 9 and the loading bins 16 are loaded according to the above scheme. From these bins, ferroalloys are fed to the conveyor 18 and fed to the system trunk conveyors 19 and conveyors 26 and 45 are loaded into separate bins 47 using conveyors 46. The hydrofluor board, which is used to enter the converter from above, goes the same way and enters the bunker reserved for it from group b anklerov 46. A hydrofluor board, designed to be blown through the bottom of the convector, going along the conveyors 26, with the help of reversible conveyors 28 is loaded into silos 29.

From the second and third rows of bunkers 2, metal-containing components (ore, pellets) are fed to the system of main conveyors 19 by means of feeders and conveyors 5, then they are loaded onto conveyors 26 and 45 and the corresponding silos 47 of the feed systems are loaded into them.

From the fourth row of bins, 2 are known, and they are fed to the conveyor 6 with the help of feeders 3, and the corresponding group of silos 13 is loaded through the conveyor path 20 with the help of a self-propelled dumping trolley. along the conveyor system 22, it enters the calcining section 23. Lime obtained after calcining limestone from the compartment through conveyor 24 through reloading hopper 25 through conveyors 26 and 45 is loaded into corresponding hoppers 47 using conveyor carts 46. Part of the lime is intended to be blown through the bottom of the converter (similarly to the part of fluors) conveyors 26, using the same reversing conveyors 28 are loaded into the appropriate containers of silos 29.

To prepare and supply lime and fluorite shpat to blow them through the bottom into the converter from silos 29 using feeders 30 and reversible conveyors 31 are loaded into the corresponding capacities of the hopper 32. From these bins, the feeders feed the crusher 34 through the funnel 33. Lime and fluorite conveyor 35 are conveyed to the bunker 36. From the bunker by the conveyor system 37, the components are fed for grinding into a ball mill 38. Powder-like materials from the mill are fed by the elevator 39 into classifier 40. And Classifier fine fraction, is suitable for injecting a converter for estrus supplied to conveyor 41 and away from the hopper 42, and large - from the classifier is fed again to the hopper 36 and -idet for regrinding.

From the bunker 42, using a pneumatic conveying unit 43, pulverized fractions of lime and fluorite material are introduced through pipelines into the storage tanks 44. Periodically (in the process of the converter bottom blow) materials by the pneumatic transport system 43 and the gaseous components supply system (Fig. 2) are introduced into the metal through the bottom tuyeres. When loading from the hoppers 47 with feeders 48 to the converter from the top 48, bulk materials are fed to the weighing dosing devices 49. Then through the dosing valves through the chutes 52, the bulk materials are fed to the converter 53. Ferroalloys from the storage bins 47 allocated for their storage, but with calcination in furnaces 50 and subsequent commissioning of chutes 52 in the ladle 54.

The present invention provides complex mechanization and automation of the preparation and supply of bulk materials during their combined input into the melting unit and the pouring ladle, allows preparing and introducing components simultaneously, both from above and through the bottom of the converter, while ensuring continuity of the process to the plant and its unloading from railway wagons before entering it into the converter or into the ladle, in specified modes and ratios.

The estimated economic effect is about 500 thousand rubles. in year.

Claims (2)

1. Arist LM and others. Mechanization of work in conveyor workshops. M., “Metallurgists, 1977, p. 54-55. 2. USSR author's certificate number 747472, cl. C 21 C 7/00, 1980. S9 "M K | :