SU705725A1 - Device for granulating molten slag - Google Patents

Description

I

The invention relates to the granulation of molten slag in metallurgical furnaces.

A known device for granulating molten slag, a slag chute containing a hydrogranulator sequentially, and a sump bunker, equipped with a grate and overflow device and connected with an airlift with a carousel dehydrator, and under the overflow device of the sump bin, a circulating water unit is installed, connected hydrofoam pumps fl.

The disadvantage of this installation is that it does not have devices for cooling circulating water, which leads to the formation of lightweight granules and contributes to a significant release of harmful sulfur emissions due to the supply of water with a temperature close to boiling point for granulation.

The indicated drawback is partially eliminated in installations equipped with cooling towers ..

A known installation, containing a chute for supplying slag, installed below it nozzles for introducing cooling water, a silo-mixer, pumps for transferring the slagwater NSD pulp sump, a circulating water tank and connected to it cooling towers for cooling circulating water and pumps for supplying it to nozzles 2,

The disadvantage of this installation is the complexity of the means for pumping and pumping the resourceful water, since they consist of cooling towers and two stages of pumps with numerous auxiliary pipelines a (fans, pipelines, valves, regulators).

The aim of the invention is to simplify the installation.

This goal is achieved by the fact that, in a well-known installation for graiut (molov37, no molten slag containing a chute for supplying slag, nozzles for cooling water inlet installed below, a sump, a circulating water tank and means for cooling the circulating water connected to it and feeding it to the nozzles , means for cooling the water treatment and supplying it to the salts contain an air-lift located in the tank of the circulating water and a water-pressure column connected to it. Cooling and pumping means Recycling water in the form of a single device - Airlift - greatly simplifies installation and increases reliability in operation. The drawing shows the proposed installation. The installation contains a chute 1 for feeding slag, under which the nozzles of the hydraulic granulator 2, the settling tank 3, the equipped tank 4 of circulating water and a compartment 5 are placed; delays of oversized random items. In compartment 5 there is a slag & airlift which consists of an air nozzle 6, a lifting pipe 7, a pipe 8 for supplying air, a conduit of 9 dp of slag stirring up at the inlet and a separator 10 Separator-10 airlift connection 11 with a carousel dehydrator 11, under which a water collector I2 is placed with a drain pipe 13 and a hoe for drying granulated slag with air supplied through a collector 15 .. By the drying bin of the mouth of the conveyor 16. The upper part of the sump goes into pipe 17 for disposal formed during the granulation of steam and steam-air mixture coming from the dehydrator through the pipe 18. The airlift for supplying water to the granulation consisting of air duct 19, air nozzle 20., lifting pipe 21, separator 22d of the water-pressure column is installed in the circulating-water tank 4 23 pipe 24 for discharge of spent air and excess water. The installation works as follows. Molten obiaK from blast furnace through chute 1 flows into the flow. Water exiting the nozzle of a hydraulic granulator 2. Due to the dynamic and thermal effect of the flow, the molten slag is crushed and cooled. The resulting vapor through pipe 17 is vented to the atmosphere4. Final cooling and solidification of the slag melt particles 5 occurs when they are immersed in the water of the sump 3, the level of which is kept constant by the constant overflow tank 4. Oversized random items are retained by the gratings. Under the action of air introduced through pipe 8 through nozzle 6, the precipitate of the coal spindle from the lower part of compartment 5, after preliminary vzstuchivanie water, from the conduit 9 is pumped at a concentration. This is carried out along the riser pipe 7 of the airlift to the separator 10, from where it flows by gravity into a carousel dehydrator 11 consisting of sixteen sections with mesh bottoms. When the dewatering machine rotates, each section successively goes through periods: filling it with pulp, filtering water through the mesh bottoms and unloading the pelt into the drying hopper 14. water and pipe 13 is discharged back into the sump 3. The granulated slag discharged into the hopper 14 has a moisture content of about 10% and a temperature of about 90 C. To further reduce the moisture of the slag due to its fi nical heat predgsmatrivaets granshlaka purging air supplied through the manifold 15. The dried and cooled granshlak drying hopper of the conveyor belt 16 is removed to storage or wagons. The air exhausted in the airlift and the air after the blowing of the granulated slag is removed. through pipes 18 and 17 to the atmosphere. The overflow from the settling tank 3 to the tank 4 is recycled water due to the air introduced through the duct 19 into the air nozzle 20 is lifted through pipe 21 to the separator 22, from where it flows into the airlift water column 23 and enters the next cycle of crushing the melt into the granulator nozzles 2, in the airlift, air and excess water through pipe 24 are diverted into pipe 17. When working on hot water and insufficient pressure at the suction side, cavitational destruction of the pumps in the prototype can occur, while in the proposed device hot water pumping An increase th KTSTS airlift, since the air is saturated with water chambers and increases pairs

Claims (1)

Claim A plant for granulating molten slag, comprising a slag feed chute, nozzles for introducing cooling water, a settling tank, a circulating water tank and means for cooling the circulating water and supplying it to the nozzles connected thereto, characterized in that, for the purpose of simplification of the installation, means for cooling the circulating water and supplying it to the nozzles comprise an airlift located in the circulating water tank and a water column connected thereto.