SU546584A1 - Slag granulation and dewatering plant - Google Patents

Description

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The invention relates to metallurgy.

A known plant for granulating slag at metallurgical furnaces, comprising a liquid slag channel, a granulator, a pulley receiving bin, airlift, a dewatering bunker, a drying bin, pipelines and pumps for feeding recycled water to the granulation.

This installation, due to the lack of devices for thickening the air before the airlift, requires the airlift to pump together with the granulated slag all the water supplied to the granulation. As a result, the energy costs of pumping large quantities of ballast water increase and the dimensions of the dehydrators and the installation as a whole increase.

Known closest to the technical solution to the proposed plant for the granulation and dewatering of slags, containing slag, granulator and bunker - sump, equipped with a grate and a device for maintaining a constant level of water and connected by airlift to a carousel dehydrator, under which the grain drying bin is located Slag and sewer.

Such an installation requires large capital expenditures and maintenance costs due to the need to construct and maintain

a bulky system with numerous valves for water clarification (start up) and pumping recycled water. The purpose of the invention is to reduce costs and increase the reliability of the operation of installations.

The aim is achieved by the fact that the granulator is made in the form of a jet wheel enclosed in a cochlear casing and placed in a bunker-settler under the nose of a slag chute with partial immersion in water.

The drawing shows the proposed installation.

Slag trough 1, granulator in the form of a jet wheel 2 enclosed in a cochlear casing 3, a settling bunker 4 equipped with an airlift compartment, a grating 5 with cells more than 1/3 of the diameter of the airlift riser for delaying oversized random

iredmetov and a device for maintaining a constant water level (not shown). The airlift consists of an air nozzle 6, a lifting pipe 7, a pipe 8 for supplying air, a conduit 9 for stirring up slag and

separator 10.

The separator 10 airlift connected to the dehydrator And carousel type, under which is located the sump 12 with drain

a pipe 13 and a hopper 14 for drying the slag with air supplied through a collector 15. A conveyor 16 is installed under the drying hopper. The upper part of the settling bunker 4 passes into the pipe 17 to drain the resulting granulation of the steam and air-steam mixture coming in from the dehydrator through the pipe 18 .

The installation works in the following way.

The molten slag from the blast furnace along chute 1 flows onto the water flow created by the water wheel 2 and the cover m. 3. Due to the dynamic and thermal effect of the water flow, the slag is crushed and cooled. The formation of vapor through pipe 17 is vented to the atmosphere. Further cooling and solidification of the slag melt particles occurs when they are immersed in the water of the settling bunker 4, the level of which is kept constant. Oversized random objects are retained by the grille 5. Under the action of air introduced through pipe 8 through nozzle 6, sediment from the bottom of the bunker and drainage basin after preliminary vzramuchivanie water from the conduit 9 pumps the concentration T: W 1: 2 through the riser 7 airlift to separator 10, from where gravity flows into a carousel-type dehydrator 11 consisting of sixteen sections with mesh bottoms. When the dewatering machine is rotated, each section successively passes through the filling positions of the pulp, filtering the water through the sieve bottoms, and discharging the slag into the drying hopper 14. In the event of overflow, water from the sections through the lowered wall is poured into the annular catchment basin 12. Filter water from the slag enters the same collector, and through the pipe 13 is discharged back into the settling bunker 4. Discharged into the bunker 14, the slag has a moisture content of about 10% and a temperature of about 90 ° C. In order to further reduce the moisture of the slag due to its

physical heat is provided to blow the granulated slag with air supplied through the collector 15. The dried and cooled granulated slag from the drying bin is conveyed by a conveyor belt 16 to a warehouse or wagons. The air which has worked in the airlift and the air after the blowing of the granulated slag is removed through pipes 18 and 17 to the atmosphere.

The use of a granulator in the form of a jet wheel, enclosed in a cochlear casing and built into the settling bin, eliminates the need for clarification and transfer of circulating water, frees the installation from the circulating water tank, pumps and pipelines with numerous fittings. The energy consumed by a jet wheel is about two times less than the cost of creating a certain fractional water flow than by pumps with jetting machines, since in this case the high-speed energy of the water is used directly, without conversion to static pressure (in the pump) and velocity velocity (in the pressure monitor torus).

All this makes the installation more compact, more reliable and capital costs and operating costs.

Claims (1)

Invention Formula A plant for the granulation and dewatering of slag, containing a slag chute, a granulator and a settling bunker, equipped with a grinder and a device for maintaining a constant WATER level and connected by airlift to a carousel dehydrator, under which the granule slag and the water collector are located, with a rotary cutter, under which there is a granule drain and a water trap, a separator with a rotary carcass-type, under which is placed a granulated slag and a water trap, with a rotary drainer type, with a drain carcass-type, under which is placed a granulated slag with a drain pit and a drainer with a rotary carousel type, under which is placed a granulated slag and a water trap with a rotary drainer with a rotary-type rotary slug under which there is a granulated slag and a water trap and a drain carcass-type dehydrator. that, in order to reduce costs and increase reliability, the granulator is made in the form of a jet wheel enclosed in a cochlear housing placed in a bunker-settler under the toe of a slag chute with partial immersion. ,,; .- г - ;; - | 1; -Г- ,, 11: 2-: T I | 1,.,  ; KPi |;, i U- Ш  i: K.: mf w / b , -five