SU1167224A1 - Production line for treating aluminium slags - Google Patents

Description

Od

Yu

4iik

The invention relates to non-ferrous metallurgy, in particular to the processing of alkali slag, and can be used in enterprises of secondary non-ferrous metallurgy.

A known production line for the processing of aluminum slags, containing a donkey loading unit, a line of metal extraction, a line for the processing of slag with a fraction of 0.6-1.0 mm for a blowing agent for cellular concrete and a line for processing slag with a fraction of less than 0.6 mm for alumina C

. The disadvantage of this production line is that there is no dust and harmful emissions in it, which pollute the atmosphere of the workshop.

Closest to the invention to the technical essence and the achieved result is a production line for slag processing, which contains a hopper, a conveyor for feeding slag for processing, a crusher, a vibratory feeder, a first intermediate conveyor, a dryer, a second intermediate conveyor, a roar, a ball mill, a third intermediate an electromagnetic drum conveyor, as well as a dust extraction and pneumatic classification system for fine-grained slag 2.

The disadvantages of this line are the relatively low extraction of aluminum from the slag fraction — 80 mm, as well as the unfavorable working conditions, due to the presence of a large number of places of material transfer and the release of significant amounts of dust and other harmful impurities in these places.

The purpose of the invention is to increase the extraction of aluminum and improve working conditions.

The goal is achieved by the fact that in a production line for the processing of aluminum slags containing a hopper with a feeder, a crusher, a drum dryer, a classifier of crushed material, a ball mill, as well as a system for collecting dust and pneumatic classification of slags, the classifier is made in the form of a drum screen installed at the drum outlet dryers with the formation of an annular gap, the discharge head of the dryer is tightly connected to a ball mill, and under the discharge end of the screen. Inonu with a nozzle equipped with a sealing gate.

FIG. 1 shows a structural diagram of a production line; in fig. 2 - unloading head of the screen and drum dryer, general view; in fig. 3 shows section A-A in FIG. 2

The flow line (Fig. 1) contains a hopper 1 with vibropitalslem 2, a crusher 3, a vibratory feeder of the dryer 4, a drum dryer 5 with a furnace 6, a belt conveyor 7 with an electromagnetic pulley 8, a discharge head 9 of the dryer, a ball mill 10, a dust extraction air pipe 11, air lock 1 americ gate 12 and pneumatic classification system for slags, consisting of a pier chamber 13 with a lock gate valve 14, cyclones 15 with a lock gate valve 16, a main fan 17, bag filters 18 with a screw conveyor 19, a fan 20 air purge and exhaust fan 21.

Inside the drum dryer (FIGS. 2 and 3), a drum screen 22 with a cell diameter of 0.08 m is concentrically mounted in the loading area of the materials, and reloading lifters (scoops) 23 are placed in front of the screen. At the end of the drum dryer there is an unloading, empty head of the dryer with an inclined the chute 24 combined with the discharge head of the drum screen produced in the form of the discharge chute 25 and discharge pipe 26 with sealing gates 27. The discharge screen chute and its discharge pipe are located perpendicular to the longitudinal axis of the dryer. The combined discharge head is sealed, made with the possibility of separate unloading of the dryer and drum screen and connects them with a ball mill and a pneumatic classification system into a single dust-air-air path.

The inner surface of the grinding chamber of the ball mill at a distance of 0.3-0.8 m from the end of the drum is lined with plates of non-ferromagnetic material, and the rest of it is covered with plates of ferromagnetic material. On the outer side of the mill drum, electromagnets 28 are located in the area of the grinding chamber with a ferromagnetic L lining. Pole tips 29 which face the drum are installed with a gap and form a disconnected magnetic system. Electromagnetics are installed in the zone of the most intensive grinding of material from the bottom of the drum and around its circumference in the direction of rotation of the mill in sector 60-180. Flow line works as follows. Slag from the hopper 1 is fed using vibrating feeder 2 to crusher 3, where it is pre-crushed and large pieces of aluminum of fraction +80 mm are opened. The feed rate of slag for processing is controlled by changing the amplitude of vibrations of the vibratory flow of feeder 2. From the crusher 3, the slag flows out onto the vibrating feeder 4 with a closed vibrating channel and enters the drum dryer 5. Places of slag transfer from the hopper 1 to the vibrating flow of the feeder 2, from the vibrating channel to crusher 3, from crushers on the vibrating flow of the feeder 4 and from this vibrating channel into the dryer 5 are sealed with elastic materials (artificial leather, etc.) so that fresh air is sucked into the dryer 5 through the crusher 3 and the loading bin 1 and prevented pype education in the loading zone and crushed slag. As a heat carrier, a mixture of flue gases and air heated to 150-200C is used, which enters the dryer 5 from the furnace 6. When the drying drum gets into rotation, the slag is dried, additional grinding 1 is stirred and mixed, and moves along the longitudinal axis of the drum. When approaching the injected drum screen 22, the slag with the help of lifters 23 is reloaded into it and moves further to the discharge head 9. At the same time, large pieces larger than 80 mm (final product A) remain inside screen 22 and then through the branch pipe 26 arrive at the belt conveyor 7. Pieces of slag with a size of less than 80 mg, which require further grinding and additional drying for the full opening of aluminum particles, are requested through the holes of the inserted drum screen, are moved along it and later on The discharge chute 24 of the discharge head 9 flows together with the coolant into the ball mill 10. In the ball mill, the slag is crushed, due to which the aluminum particles are completely freed from non-metallic components. In this case, the ferromagnetic lining of the mill magnetized by electromagnets 2B, attracting grinding balls to itself, prevents them from entering the unloading zone and unloading them from the mill together with the material being unloaded. This is also facilitated by the lining of the grinding chamber of the mill in the area of the unloading trunnion, made of non-ferromagnetic material plates, and the absence of electromagnets in this zone 28. Fine particles of metal-concentrated aluminum fraction + 3-80 mm (final product B) from the mill fall into the lower part of the absorbing air duct 11 and through a sluice chamber shutter 12 enter the belt conveyor 7, and dust particles are carried away by air flow into the system of pneumatic slag classification. The fine-grained metal of the +1.2–3.0 mm fraction is deposited in the piteum chamber 13 and through a sluice lobe gate 14 enters the belt conveyor 7 and then, together with large metal particles (final product A) and small metal particles (final product B), falls on a magnetic separation unit, which is an electromagnetic pulley 8 of a conveyor belt 7. The resulting aluminum concentrate is fed to remelting, and the separated ferromagnetic particles are sent to Vtorchermet facilities. Fine-grained pshak + 0.15 - 1.2 mm (final product D) settles in cyclones 15. This portion of the slag is loaded into the soft container through a rotary vane shutter 16 and can later be used to prepare exothermic mixtures. In the bag filters 18, dust particles of the slag fraction are accumulated - 0.15 mm (final product D). This part of the slag is discharged from the bag filters by means of a screw conveyor 19 and can later be used to regenerate the fluxes. The volume of air, which is cleaned in the bag filters 18 and emitted further into the atmosphere, is equal to the flow of air into the pneumlassification system through the crusher 3, the hopper 1 and other leaks. The remaining part of the air, which is necessary for the effective drying of the slag and its pneumatic classification, is recycled (it is additionally heated, mixing in the furnace 6 with flue gases.

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and returns to the drum dryer 5).

The introduction of the proposed furnace line will improve the conditions for removing 5 metal particles from the slag fraction - 80 mm, eliminating intermediate places of transfer and transporting slag (from the feed hopper to the crusher, and crushers to the drum O dryer), from the dryer at rpoxo Tjt eliminate additional emissions of harmful emissions into the atmosphere - and also to reduce the area of the workshop, necessary for the installation of the production line 15.

Claims (1)

ALUMINUM BOILER PRODUCTION LINE FOR PROCESSING, containing a hopper with a feeder, a crusher, a drum dryer, a classifier of crushed material, a ball mill, as well as a dust collection system and pneumatic classification of slags, which is clear in order to increase aluminum extraction and improve working conditions , the classifier is made in the form of a drum screen installed at the outlet of the drum dryer with the formation of an annular gap, the discharge head of the dryer -χ is connected tightly with a ball mill, and under azgruzochnym end set thunder chute connected to the pipe, equipped with a sealing gate. SU ,, 1167224