SU1497172A1 - Apparatus for granulating slag melts - Google Patents

Abstract

The device relates to the processing, in particular, to the granulation of slag melts formed in various industries of metallurgy, energy, chemical industry. The purpose of the invention is to increase the efficiency of oxidation of sulfide compounds contained in the slag, preventing slag deposits on the bottom of the tank by improving the mixing. The device contains a container 1 with a lid 2 and an inclined bottom 3, closely above which is placed a bubbling element consisting of a series of parallel duct-distributors 4 with openings of a slag-feeding chute 7, a branch pipe 8 for water supply, a branch pipe 9 for air supply, a branch pipe 10 for removal of vodnoslakovogo pulp, exhaust pipe 11 for removal of vapor-gas mixture. The holes are as close as possible to the surface of the bottom of the container, placed as far as possible in one plane, parallel to the surface of the bottom. The holes are made with longitudinal (along the air flow) axes alternately tangentially and radially with respect to the cross section of the distributor ducts. Tangentially located holes are oriented with their longitudinal axes toward the branch pipe for draining water-slag pulp. 3 il.

Description

The invention relates to the processing, in particular, the granulation of slag melts formed in various industries of metallurgy, energy, chemical industry, etc.

The purpose of the invention is to increase the efficiency of oxidation of sulfide compounds contained in the slag, preventing slag deposits on the bottom of the tank due to improved mixing.

FIG. T schematically shows the device, a longitudinal section; in fig. 2 shows section A-A in FIG. one; in FIG. 3 a section. B-B in FIG. 2

A device for the granulation of slag melts contains a tank 1 with a lid 2 and an inclined bottom 3, above which is placed a bubbling element consisting of a series of parallel distributor ducts 4, with openings 5 and 6, an emptying chute 7, a spout 8 for water supply

pipe 9 for the supply of air, pipe 10 for removal of water-pulp pulp, exhaust pipe 11 for removal of the vapor-air mixture into the atmosphere.

The device works as follows.

Slag melt is poured into the tank 1 in the slag feeding chute, where a jet of liquid flowing out of the basal slag is broken with a jet of water supplied under pressure in several atmospheres (several tenths of a megapascals) into the vessel through the water inlet. Drops and particles of solidified slag are fed into the liquid, which fills the lower part of the tank, where the final cooling takes place and the granule cy-spack. Water-slag pulp from the bottom of the tank is discharged through the pipe 10 to the subsequent dehydration. The fluid level in the capacitance is maintained at the desired level using known devices that are not shown in the figure (for example, overflow pipelines, adjusting valves, etc.). Through pipe 8, through the distributor ducts 4, air under pressure (sufficient to overcome the hydraulic resistance of the ducts and the pulp layer in the tank) is distributed into the fluid, as evenly as possible distributed by means of tangential 5 and radial 6 holes.

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Air is bubbled through a layer of water-slag pulp, causing mixing of the slag particles and oxidation of the sulfide compounds contained in the slag and in the aqueous solution. The vapors and gases formed during the contacting of the droplets and particles of the slag with water are mixed with air and are discharged through the exhaust pipe 11 to the atmosphere or are returned to the bar by the fan element.

To prevent slag deposits on the bottom of the tank, to improve slag mixing in the pulp and to increase the oxidation efficiency of sulfide compounds contained in the slag, the air outlet holes from the distributor ducts are as close as possible to the bottom surface of the tank and are located approximately in the same plane parallel to the bottom of the tank , so that the holes with a longitudinal (along the air) axis, perpendicular to the surface of the bottom and radial with respect to the cross-section of the air ducts-distribution teley alternately interspersed with apertures whose longitudinal axis arranged tangentially, i.e. tangential to the cross section of the distributor ducts, so that the air jets go out close to the bottom surface and parallel to it. In this case, the particles of the keg deposited on the bottom are blown away. jets of air escaping from the tangential orifices and are brought to suspension, where they are vigorously stirred by bubbling air, thereby increasing the oxidation efficiency of sulfide compounds. In addition, increasing the mixing intensity of the pulp itself improves the quality of the granulated slag as a product, since it makes its fractional composition (by particle size) more uniform. Air jets coming out of distributor ducts perpendicular to the bottom surface, hit the bottom surface and, wrapping around it, blow away the cooled spit particles, rendering them suspended. The axes of the tangential holes are oriented in the direction of the nozzle for removal of the water-slag pulp, i.e. their longitudinal axes are at a certain angle with

and the longitudinal axis of the distributor ducts, the value of which depends on the angle of inclination of the bottom of the tank to the horizontal plane. With a significant bottom tilt angle (on the order of 20-30 ° or more), when the 1plake particles are relatively easy to roll in the direction of the pulp removal unit, the angle c / should be taken on the order of 60-70 °. When the bottom tilt angle decreases (less than 20), the angle should be reduced accordingly (to A5-30 °). Due to this orientation of the tangential openings, the slag particles are pushed by jets of bubbling air towards the pulpoot branch pipe, which also helps to prevent the formation of slag deposits on the bottom of the vessel. Experimental verification showed that the formation of slag deposits on the bottom is almost completely eliminated with the alternation of tangential and radial holes located in the close to the surface of the bottom, in a plane parallel to the surface of the bottom. In other cases of placement of the holes, slag particles were observed in the areas of aero-hydrodynamic shadow (i.e. in stagnant zones with weak pulp mixing). Moreover, the proposed placement of the holes is the most favorable for removing from the distributor ducts particles of slag that can get into them in case of cessation of air supply. Since the thickness of the pulp layer in the tank is not the same and increases towards the pulp vent. atrubka, when the same cross-sectional area of all the apertures 5 and 6 can be observed uneven rasprdelenie bubbling air through the container space. In order to avoid such an uneven distribution of air in necessary cases (at low pressure of air supplied through the pipe 8), it may be advisable to gradually increase

the cross-sectional area tan-. genial and radial holes 5 and 6 as the thickness of the fluid layer increases. With significant air pressures in distribution ducts, when the height of the liquid layer does not play a significant role, all the openings can be performed with the same cross-sectional area. The use of a slag granulation device at the bottom of the tank will increase the formation of deposits moving the slag particles in the water-slag pulp, the efficiency of the oxidation of sulfide compounds contained in the slag, the quality of the granulated clay as raw materials and building material, The release of toxic gaseous substances, in particular hydrogen sulfide, is prevented during subsequent processing, storage, transportation and use of granulated slag.

Claims (1)

Invention Formula A device for the granulation of slag melts containing a tank, an inclined bottom, a bubbling element consisting of a series of parallel duct-distributors with holes, an exhaust pipe, a slag channel, a chute, pipes for supplying water and air and draining the water-slag pulp , in order to increase the oxidation efficiency of sulfide compounds contained in the slag, to prevent slag deposits on the bottom of the tank by improving mixing, the air ducts are located in one flat spine parallel to the bottom surface in close proximity thereto, and openings are formed alternately in the radial and tangential, the latter being oriented in the direction of the nozzle for discharging the aqueous slurry of the slag. 4 v A-f ( AT 5 Pplpo. I