UA81666C2 - Line for preparation and sypplying of material metallurgical charge - Google Patents

Abstract

A line for preparation and supplying of material of metallurgical charge comprises a device for trapping fine fraction wastes of material roasting from flue gases of roasting unit, reservoir for gathering fine fractions of wastes of material roasting, at least one reactor equipped with water gauge, reservoir for intake of ferriferous waste of metallurgical production and system of briquettes formation. Reservoirs are connected to the reactor through material batching and transportation means. The system of material briquettes formation comprises supply mechanism and material briquetting mechanism and is connected to the reactor by material supply means. A forced mixer is used as a reactor. It provides simultaneous processing of fine-dispersated wastes of limestone roasting and ferriferous waste of metallurgical production into slag forming ferriferous briquettes.

Description

Description of the invention

The invention relates to ferrous metallurgy, in particular to the preparation of waste from the burning of fluxing components for 2 feed to the metallurgical charge by the production of iron-containing slag-forming briquettes, which are used as a substitute for lime in the production of cast iron and steel.

A well-known device for dedusting waste gases of a rotary kiln intended for burning limestone, which contains a chamber with bag filters and a dust collection hopper located at the loading end of the kiln, see A.S. USSR Mo1649227, MKV5 E27В 7/20, pub. 15.05.91, Bull. Mo18).

The essential features of the analogue, which coincide with the essential features of the claimed technical solution, are: a device for dedusting waste gases containing a dust collection hopper.

The disadvantage of the analogue is the impossibility of disposing of a significant amount of aspiration dust at the place of its formation.

Therefore, the lime dust captured by the device for dedusting the waste gases of the rotary kiln accumulates in the bunker, and then it is transferred by motor vehicle or other means of transport to the preparation area of 19 Batches of the sinter plant, and in enterprises where there is no sinter plant, it is taken to a dump or transferred to construction enterprises.

Taking into account the physical properties of dust (fine fractionation, increased activity in the open air, dust release during overloads, etc.), its transfer and use from a distance from the place of formation causes additional difficulties (requires the use of special vehicles, aspiration of loading and unloading places, limited storage time, etc.) .

A well-known line for the preparation and supply of metallurgical charge material, which includes hoppers installed along the technological process and connected by material transfer mechanisms, a mill, weighing devices, a system of the firing unit, coolers and an aspiration system, while the small fraction of the product of burning limestone, caught by electrostatic filters, is fed to the bunkers and further to slaking (in agglomeration) see patent of Ukraine Mob439 C1, MKV5 Z C228 1/00, pub. 29.12.94. Bul. Mo8-1). This decision was made according to Go) the closest analogue.

The essential features of the closest analogue, which coincide with the essential features of the claimed technical solution, are: a device for dedusting waste gases, a hopper for collecting dust.

The disadvantage of the known device is the lack of lime slaking means, which leads to a limited consumption of lime in the coal batch due to the release of a proportionally increasing number of toxic dust-like fractions that are formed during lime slaking at the moment of its contact with wet concentrate and water, large losses of lime (up to 590 as a result of removal of its small fractions with steam, which is intensively formed during the period of lime quenching, incomplete use of the intensifying ability of lime due to insufficient contact of lime with the concentrate. Therefore, the process "- the quenching of individual particles of lime does not have time to end and proceeds when the charge is rolled and placed on

From an adhesive tape. Since the process of quenching lime is accompanied by an increase in its volume, this leads to the co-destruction of the granules of the charge that have already formed.

The basis of the invention is the task of improving the line for the preparation and supply of metallurgical charge material by expanding its technological capabilities due to the introduction of new links to it, which "ensure the compatible processing of fine-fraction waste from burning limestone and iron-containing waste from 50 metallurgical factories into slag-forming iron-containing briquettes." t c The task is solved by the fact that the line for the preparation and supply of metallurgical charge material, which "includes a device for capturing fine fractional material incineration waste from waste gases from the incineration unit and a container for collecting fine fractional material incineration waste, according to the invention, contains a reactor equipped with a water dispenser, a container for receiving iron-containing metallurgical waste and a briquette forming system, connected to the reactor by the means of feeding, dosing and co-transportation of material, and a forced action mixer is installed as a reactor, and the briquette forming system consists of material feeding and briquetting mechanisms .

In addition, the line contains two or more reactors, and a vibropress is used as a material briquetting mechanism. (22 Cause-and-effect relationship between the set of essential features of the invention and the technical result, which

F 20 is achieved, consists in the following.

The introduction of a reactor line in the form of a forced-action mixer equipped with a water dispenser 2) and its connection by means of supply with a container for collecting fine-fraction waste from burning material and a container for receiving iron-containing waste from metallurgical production allows to combine the performance of two functions in one devices (the function of the reactor and the function of the mixer), namely: to carry out "quenching" of lime and 22 its connection with iron-containing waste of metallurgical production in one device. o The introduction of the briquette forming system and means of receiving and supplying iron-containing waste from metallurgical production into the composition of the line allows to obtain iron-containing slag-forming briquettes, which are used instead of lime in the production of iron and steel, as a substitute for quicklime.

Installation of two mixers working cyclically (when the first mixer is working, the second one is loaded 60 times and vice versa) ensures the continuity of the "quenching" mode and the entire cycle as a whole.

In case of market demand in the lime dough, the admixture of iron-containing metallurgical waste is excluded from the technological process and briquettes are not formed.

Ready-made lime dough is unloaded directly from the reactor (forced action mixer) to vehicles or packed in plastic bags using a packaging machine. because the invention is explained by the drawing, where fig. the technological diagram of the line is given.

The line for the preparation and supply of the metallurgical charge material contains a device 1 for capturing the fine-fraction waste of burning material from the waste gases from the firing unit 2 and the container C for collecting the fine-fraction waste of burning material, and also contains the reactor 4, equipped with a dispenser

WATER 5, container 6 for receiving iron-containing metallurgical waste and briquette formation system 7, connected to reactor 4 by means of supply 8, dosing 9 and transportation 12 of material. System 7 of forming briquettes consists of feeding mechanisms 10 and briquetting 11 of the material. A vibropress is installed as a briquetting mechanism.

The line works as follows. 70 Crushed material (limestone) is sent to the unit for burning 2. After burning, the material falls (not shown in the drawing) to the precipitators and cools, and the gas stream containing fine-fraction aspiration lime is directed to the device (1) for catching fine-fraction waste from burning the material and cleaned. The purified gas is released into the atmosphere with the help of a fan and a pipe, and the lime dust caught in the device (1) is directed to the container C for the collection of fine-fraction waste from the burning of the material, and then it is fed to the reactor-mixer 4 of forced action by means of supply 12, there by a dispenser 5 add water and stir until the lime is completely "extinguished". In order to ensure the continuity of the cycle and ensure the "quenching" mode in the line, the installation of two mixers 4, working cyclically - during the operation of the first mixer, the second one is loaded and vice versa.

Reception of iron-containing waste of metallurgical production is carried out in the capacity b for reception of 2o of iron-containing waste of metallurgical production, from which the means of transportation 12 is transferred in a given ratio, taking into account the preparation of the mixture with a moisture content of 8-10905.

The total time for preparing the dough is 5-6 minutes.

The prepared semi-dry mixture is fed to the briquette forming system 7, which consists of feeding 10 and briquetting mechanisms 11, by means of feeding 8, for example, a belt conveyor.

After forming, raw briquettes on technological pallets are placed in containers and transferred to hardening stations. After 12-14 hours, the briquettes are unloaded to the hopper, from the hopper as they accumulate - to the dump truck (8) and taken to the consumer (blast or steelworks).

The use of the invention ensures the disposal of slaked aspirated lime directly at the place of its formation, which eliminates the negative impact of dust on the environment, reduces the costs of dust transportation, eliminates the use of special means of transportation, and also allows you to obtain a product with new consumer properties - iron-containing slag-forming briquettes , which are used in the metallurgical process as a substitute for slaked lime. This makes it possible to reduce production costs when obtaining cast iron or steel by replacing part of the components with briquettes made on the basis of waste and reducing waste disposal costs. h- so

Claims (2)

The formula of the invention 1. A line for the preparation and supply of metallurgical charge material, containing a device (1) for catching " 20 small-fraction waste material incineration from waste from the unit (2) gas combustion and a container (3) 7 for collecting fine-fraction material incineration waste, which differs in that , containing at least one s reactor (4), equipped with a water dispenser (5), a container (6) for receiving iron-containing waste from metallurgical production and a system (7) for forming briquettes, while a container for collecting small-fraction waste from incineration of material and a container for the reception of ferrous metallurgical wastes are connected to the reactor (4) by the means of dosing (9) and transportation (12) of the material, the briquette formation system is connected to the reactor by the means of feeding (8), as a reactor, a forced mixer is used, and the system (7) formation of briquettes includes a feeding mechanism (10) and a briquetting mechanism (11) of the material. -- 2. The line according to claim 1, which differs in that a vibropress is used as a briquetting mechanism (11) of the material. (22) (22) (42) F) ko 60 b5