RU2293775C2 - Line for manufacturing of iron-containing briquettes on the basis of metallurgical production wastes - Google Patents

Abstract

FIELD: ferrous metallurgy, in particular, utilization of metallurgical wastes which may be used as additional raw material in blast furnace and steel melting production.

SUBSTANCE: line for manufacturing of briquettes has system for preparing burden and forming briquettes, including reservoirs for receiving of raw material, amending and binding additives, said reservoirs being arranged in the course of process and being connected through feeding, dosing and transportation mechanisms with mixer which is joined to vibration press. Vibration press is provided with vibrators positioned so as to transmit vibrating motions to punch and die in two mutually perpendicular planes. Line is also provided with system for extracting of iron-containing material from scale-and-oil containing muds of secondary sumps of rolling shops and oil regeneration system, said systems being connected with one another. Line of such construction allows muds of secondary sumps of rolling shops to be processed, said muds including small-sized fraction scale having oil content of up to 15-17%.

EFFECT: increased efficiency of vibrating action upon mass to be formed, provision for producing of metallurgical briquette with increased content of metal within given volume and increased destruction resistance, and also provision for producing of mineral oil having average viscosity and fit for immediate usage.

1 dwg

Description

The invention relates to ferrous metallurgy, in particular to the disposal of metallurgical waste that can be used as additional raw materials for blast furnace and steelmaking.

A known line for briquetting steel scale, which is a waste of metallurgical production. The line contains a means for grinding mill scale to particles 0.3–3.0 mm in size, a mixer, a press, a briquette kiln (see RF patent No. 1055919, IPC 6 C 22 V 1/242, BI No. 7, 1996) .).

To ensure the mechanical strength required from the semifinished products from the scale, the crushed scale is mixed with a special binder before pressing.

The essential features of the analogue, similar to the essential features of the claimed technical solution, are: mixer, press.

A disadvantage of the known line is the presence of a kiln in it, which leads to an increase in energy consumption and a significant increase in the cost of briquette production, and grinding scale to particles with a particle size of 0.3-3.0 mm does not allow to obtain a briquette of the required density and strength.

In addition, the design of the line does not provide the possibility of using oily scale as a raw material.

A known line for the manufacture of briquettes (see RF patent No. 2183679, IPC 7 C 21 C 5/52, C 22 B 1/24, BI No. 17, 2002), which is the closest to the technical nature and technical result achieved the claimed invention.

The line contains containers for raw materials, scales, a means for moisturizing, a mixer and a vibrating press installed during the process and connected by feed mechanisms.

The essential features of the prototype, similar to the essential features of the claimed invention, are: containers for raw materials, scales, dispenser, mixer and vibrating press, installed during the process and connected by feed mechanisms.

A disadvantage of the known line is that its design does not allow expanding its technological capabilities due to the use of mill scale and oil-containing sludge as secondary raw materials for the production of iron briquettes for the purpose of returning waste to metallurgical processes, as well as the unstable quality of the briquettes obtained using the line as insufficient quality of raw materials, and insufficient efficiency of vibration exposure in one plane on the formed m assu.

The basis of the invention is the task to improve the line for the manufacture of iron-containing briquettes based on metallurgical waste by expanding its technological capabilities by introducing new links into it, which make it possible to process slimes of secondary settling tanks of rolling shops, which include fine fraction (up to 0.02 mm scale) s oil content up to 15-17%, which, together with the use of a vibrating press, made with the possibility of vibration exposure to the briquette in two mutually perpen ikulyarnyh planes increases the efficiency of the vibratory effect on the mass being formed, it allows to optimize the pressing process, get metallurgical preform with a large metal content in a given volume, resistant to degradation, and to obtain the hydrocarbon oil medium viscosity suitable for use. The complete utilization of waste and its return to the technological processes of metallurgical production is ensured, the harmful effect on the environment is reduced.

The problem is solved in that in the line for the manufacture of iron-containing briquettes based on metallurgical waste, containing a system for preparing the charge and forming briquettes, including containers installed during the technological process (8, 9, 11) for receiving raw materials, corrective and binding additives, related feeding, dosing and transportation mechanisms with a mixer (24) connected to a vibrating press (13), according to the invention, it contains an interconnected system for extracting iron-containing material and from the scale of oil-containing sludge from the secondary settling tanks of the rolling mill and an oil recovery system, the system for extracting iron-containing material from the sludge contains a slurry mixer (2), connected to a gravity mixer (1) of sludge with detergent supplied from the reactor mixer (5) wherein the mixer (1) is installed with the possibility of draining the liquid component of the mixture (suspension) into the tank (3) and feeding the solid component of the mixture (washed scale) with a feeder 6 to the filter (7) for its dehydration, and the tank (3) is connected to containers (one 7, 18) oil recovery systems connected in series for cascade sedimentation of the suspension and connected to the storage tank (16) of oil-free effluents, which is connected by a return pipe to the mixer-reloader (2), while the tanks (18) are connected to each other in series a vibrating screen (19), a magnetic separator (20), a filter press (21) and containers (23) of oil cleared of impurities, and a vibrating press (13) of the charge preparation and briquette formation system is made with vibrators installed with the possibility of imparting a vibrator GOVERNMENTAL movements of the punch and the matrix in two mutually perpendicular planes.

A causal relationship between the totality of the essential features of the claimed invention and the achieved technical result is as follows.

The structure of the line includes three interconnected systems, namely: a system for extracting iron-containing material from scale and oil-containing sludge from the secondary settling tanks of rolling shops, which allows isolating and introducing into the composition of the mixture for the manufacture of briquettes fine-grained, up to 0.02 mm in size, scale, which is easily compacted by vibrocompression and improves product quality;

a system for preparing the mixture and forming briquettes, providing the necessary strength and density of briquettes by giving the vibropress the possibility of vibrating the formed mass in two mutually perpendicular planes;

a system for the recovery of oil from sludges from secondary settling tanks of rolling mills, which makes it possible to separate mineral waste of medium viscosity suitable for use from waste.

Such a constructive implementation of the line allows for the utilization of metallurgical waste, their return to technological stages in the form of resistant to destruction metallurgical briquettes with a high content of metal, as well as mineral oil of medium viscosity. In addition, the production of briquettes using the inventive line eliminates the harmful effects on the environment, improves the ecological condition of the enterprise, is virtually waste-free.

Thus, the set of essential features characterizing the construction of the line provides waste-free production of iron-containing briquettes resistant to destruction from scale and oil-containing sludge from the secondary settling tanks of rolling shops.

The invention is illustrated by the drawing, which shows the layout of the equipment of the line for the manufacture of iron briquettes based on waste from metallurgical production.

The line consists of a system for extracting iron-containing material from scale and oil-containing sludge from the secondary settling tanks of rolling shops, a system for preparing the charge and forming briquettes, an oil recovery system, interconnected by the feeding, weighing, dosing and transportation mechanisms established during the process.

The system for extracting iron-containing material from sludge-containing sludge from the secondary settling tanks of rolling mills (hereinafter referred to as "sludge") contains a sludge reloader 2 connected by a sludge pump 4 to a gravity mixer 1 for washing pulp obtained by mixing sludge and detergent. The gravity mixer 1 is installed with the possibility of pouring into the receiving tank 3 a liquid mixture (suspension), which was formed in it after mixing and settling the mixture of sludge and detergent and is connected by a feeder 6 for supplying the solid component of the mixture (washed scale) with its dehydration filter 7. In addition, the system includes a mixer-reactor 5 for the preparation of concentrated detergent, connected by a pipeline to a gravity mixer 1, and the filter 7 is connected to a tank 8 for receiving and accumulating dehydrated raw materials (washed scale) for the manufacture of a briquette and a storage tank for 16 drains. The receiving tank 3 for draining the suspension is connected to the tanks 17, 18 of the oil recovery system, connected in series for cascading sludge and separating oil from the slurry mixed from the mixer 1, and the tanks 17, 18 are connected to the storage tank 16 of oil-free effluents, which is connected by a return pipe to mixer-reloader 2, where the oil-free drains from the tank 16 are pumped by pump 15 for reuse. In this case, the tanks 18 are connected to the vibrating screen 19 connected in series, the magnetic separator 20, the filter press 21, which is connected by means of the pump 22 to the containers 23 for receiving and accumulating the extracted oil.

The system for preparing the mixture and forming briquettes contains a container 8 for receiving washed scale, a container 9 for additives that adjust the chemical composition of the mixture for briquettes, mechanisms 10 for feeding and dosing the mixture, feeding it to the forced action mixer 24, which is connected to the containers 11 of dust binding binders. The mixer 24 through the conveyor 12 is connected to the installation of cold volumetric vibropressing on the basis of vibropress 13, from which the formed briquettes are sent to the containers 14.

The line for the manufacture of iron briquettes based on metallurgical waste is as follows.

The mixer-reloader 2 is filled with scale-oil-containing sludge from the secondary settling tanks of the rolling shops (hereinafter “sludge”), then 16 oil-free wastewater from the storage tank are fed and the mixture is mixed. Slurry pump 4 from the mixer-reloader 2 to the gravity mixer 1 serves a mixture of sludge with water.

To prepare the washing solution, the mixer-reactor 5 is loaded in a predetermined ratio with soda ash, liquid glass, emulsifier and water, after which the resulting solution is mixed. The washing solution is supplied in a predetermined ratio to the gravity mixer 1 and after 2-3 minutes of mixing, the mixer 1 is stopped and the mixture is sedimented for 8-10 minutes, after which the settled liquid component (suspension) is drained into the receiving tank by a trough 3. After the first discharge, the liquid the phases turn on the gravity mixer 1 again and a second portion of the washing solution is supplied to it. After mixing the pulp obtained from the detergent and sludge, the mixer 1 is stopped and secondary sedimentation of the mixture is carried out. At the end of the sludge, the suspension is poured into a receiving tank 3 and the feeder 6 serves the washed scale on the dehydration filter 7, where the washed scale is dehydrated (to a concentration ensuring the desired briquette strength). Semi-dry scale from the filter 7 is fed into a container 8 for receiving and accumulating raw materials for the manufacture of the briquette. If it is necessary to adjust the chemical composition of the briquette, various deoxidizers (Mn, Al, Si, C) are added to the composition of the charge for its manufacture, they are loaded into a container 9 connected by charge and metering mechanisms 10 with a forced action mixer 24 for semi-dry mixtures. Semi-dry scale from the tank 8. by means of dosing and feeding mechanisms 10 are also sent to the mixer 24, where simultaneously pulverized binders, for example Portland cement, come from the tanks 11. The mixture of washed mill scale, pulverized binders and, if necessary, deoxidizing additives prepared by the conveyor is conveyed in the mixer 24 12 is fed to the installation of cold volume vibropressing on the basis of vibropress 13. The formation of the briquette is carried out by the method of cold volume vibropressing, that is, the simultaneous impact on s pressure and vibration in two mutually perpendicular planes. A vibrator mounted on a platform with a punch gives oscillatory movements to the punch in a vertical plane. A vibrator mounted on a platform under the matrix imparts oscillatory motion to the matrix in the horizontal plane. In the process of vibration, the viscosity of the mixture being formed rapidly decreases, friction and adhesion between the particles in the mixture are significantly reduced, the mixture being formed is transformed from a rigid and slow-moving to a moving fluid mass that quickly fills the mold. The briquettes formed on pallets are placed on containers 14 and sent to a finished goods warehouse (not shown). After forming, the briquettes must harden to achieve crush resistance.

The suspension formed as a result of double washing and settling of scale-oil-slurry slurry, consisting of water, a fine fraction of scale and oil, from the tank 3 enters the oil recovery system, where it is subsequently separated to recover components suitable for reuse (mineral oils) .

The suspension from the tank 3 of the gravity mixer 1 enters the tank 17, 18, where cascade sediment-transfusion of the solution is carried out according to the degree of separation. During the sedimentation of solutions in containers 17, 18, the suspension is divided into components. A fine fraction of the scale precipitates and is returned from the storage tank 16 to the mixer-reloader 2 in the form of an oil-free solution using a pump 15. The surface layer of the settled suspension from the settling tank 18 enters the vibrating screen 19, where it is cleaned of foreign inclusions, the size of which exceeds 0, 2 mm. The oil passing through the sieve 19 is treated with a permanent magnet of the magnetic separator 20, with which ferromagnetic particles are extracted, after which it is fed to the filter press 21, from where the oil purified from impurities is pumped into the tank 23 of its accumulation.

The use of the invention provides a return to the technological stages of metallurgical waste in the form of briquettes, which are used as an additive in the charge in the production of iron and steel.

Claims (1)

A line for the production of iron-containing briquettes based on waste from metallurgical production, containing a system for preparing the charge and forming briquettes, including containers installed during the technological process (8, 9, 11) for receiving raw materials, corrective and binding additives, connected by feeding, dosing and transportation mechanisms with a mixer (24) connected to a vibrating press (13), characterized in that it contains an interconnected system for extracting iron-containing material from scale-oil-containing sludge second egg sumps of rolling shops and an oil recovery system, while the system for extracting iron-containing material from the sludge contains a slurry mixer-loader (2) connected to a gravity mixer (1) of sludge with detergent supplied from the mixer-reactor (5), while the gravity the mixer (1) is installed with the possibility of draining the liquid component of the mixture - suspension - into the tank (3) and feeding the solid component of the mixture - washed scale - with a feeder (6) to the filter (7) for its dehydration, and the tank (3) is connected to containers (17) , 18) regeneration systems and oil, connected in series for cascade sedimentation of the suspension and communicating with the storage tank (16) of oil-free effluents, which is connected by a return pipe to the mixer-reloader (2), while the tanks (18) of the oil recovery system are connected to a vibrating screen connected in series ( 19), a magnetic separator (20), a filter press (21) and containers (23) of oil cleared of impurities, and the vibropress (13) of the charge preparation and briquette formation system is made with vibrators installed to vibrate movement of the punch and the matrix in two mutually perpendicular planes.