SU870368A1 - Unit for producing slag pumice - Google Patents

Description

one

The invention relates to the industrial construction materials, and specifically to the production of slag pumice from metallurgical slags.

A device for manufacturing spherical particles of a blast furnace slag filler, which is a rotating drum, inside which a cooling system is installed, is known. Day 11. The disadvantage of this installation is insufficient slag expansion due to the absence of a porous agent and the short time the slag particles are in a suspended state; pumice is obtained, it has low porosity and. large volumetric weight, which leads to the relaxation of structures. There is a rapid deterioration of the drum plating due to its direct contact with the hot melt.

A slag-and-cue plant is also known, consisting of two vibrating channels, each of which is a water-cooled chute mounted on a vibrating case of a standard screen. The length of the bottom part of the chutes includes chambers in which process water is fed.

chambers through the holes of the process water enters the trays. When it enters the porizer, the melt is bubbled, expanded and simultaneously cooled to a highly viscous state. The foamed mass flows from the source into the slag ladles 2 installed under it.

The disadvantage of this installation is the rapid wear of the grooves due to their warping from the thermal effect of the melt.

Closest to the proposed installation to the technical essence and the achieved result is

15 A plant for the production of slag pumice from a melt of blast furnace slag, containing a slag-receiving bath, a porizer, a screen and a paddle drum installed under the end of 20 with a horizontal axis of rotation, the porizer being in the form of a groove, the second of which is a hydraulic nozzle and a nozzle for supplying water and air. .

25

This installation requires the use of blowers, which significantly increases the cost of the process. In addition, the air supply significantly reduces the concentration of sulfur dioxide, which makes it difficult to clean the resulting steam 30

Eoe mixture in scrubbers with air protection.

The aim of the invention is to make it possible to reduce the cost of production.

The goal is achieved by the fact that in a plant for producing slag pumice from a melt of blast furnace slag containing a slag bath, a screener, a screen and a blade drum installed under the last one with a horizontal axis of rotation, the screener is made in a row of parallelly arranged rolls and mounted under them water supply devices, each of the rolls being formed by coaxially and alternately mounted disks and clubs.

In this case, disks can be mounted along the edges of the rolls, and the ratio of the radius of the clubs and the radius of their grooves is 3-5,

FIG. 1 shows the installation diagram; in fig. 2 - disk; in fig. 3 clubs

It includes a slag collecting bath porizer 2, followed by screen 3 and a paddle drum 4. The priser consists of a series of rolls 5, for example 8-10 and nozzles 6 for supplying water. When the number of rolls is less than 8, the melt is in a suspended state for a time that is insufficient for intensive slaking of slag, which negatively affects the quality of pumice (large volume weight). The roll device, consisting of 11 or more rolls, is cumbersome and metal content. Each of the rolls is assembled from 15 discs with a radius of, for example, 150 mm, and 14 clubs with a radius of 250 mm in the sequence: disc (extreme) - trefdisk., .Disk (extreme 1st). Each tref consists of 4 notches with a radius of for example, 50 mm. Due to the capture of portions of air by the grooves of the club, the elasticity of the air flow is increased and its discreteness is provided, which allows the melt to mix with water.

The ratio of the radius of the club to the radius of the groove of the club is in the range of 3-5.; With a radius ratio of less than 3, the air flow becomes largely discrete, pulsating due to the capture of large volumes of air by the grooves of the trafes, the slag melt is subjected to intensive fragmentation into drops, which Lumpy pumice is undesirable.

The ratio of the radii, greater than 5, causes the same elasticity of the air flow along the entire length of the roller device, which leads to a weak mixing of the slag melt with water and to a material with a non-uniform structure.

The rotation speed of the rolls is 1450 rpm (40 m / s). Water nozzles 5 are located in the gaps between the rollers on the bottom of the roller device and are used to supply water to the melt porosity.

The installation works as follows.

From the receiving bath 1, the slag melt enters the roller device 2, where it is expanded by the action of water supplied from the nozzles under high pressure (30-40 atm). The air captured by the rotating clubs and discs provides for the melt to move in a suspended state, eliminating its contact with the metal parts of the roller device and increasing the durability of the installation. Due to the different elasticity of the air flow on the surface of the clubs and disks and in the gaps between them, the melt mixes with water and splitting it into droplets. Due to the high energy of the air flow, slag is prevented from entering the gaps between the clubs. Under the action of the air flow, particles of the expanding slag and non-melting evaporated water are thrown onto the screen 3, where they are reunited into a plastic mass, which falls under the force of gravity onto the paddle drum 4 to cool and fix the porous structure.

Claims (3)

1. An apparatus for producing slag pumice from a melt of blast-furnace slag, containing a slag-receiving bath, a porizer, a screen and a paddle drum installed under the last axis with a horizontal axis of rotation, characterized in that, in order to make the production cheaper, the primer is parallel in shape located rolls and water supply devices mounted under them, each of the rolls being formed coaxially and alternately mounted discs and clubs. 2. The installation according to claim 1, characterized in that disks are mounted along the edges of the rolls, and the ratio of the radius of the clubs to the radius of their notches is 3-5. Sources of information taken into account in the examination 1. The patent of Japan 50-23048, cl. From 04 To 31/10, published. 1975. 2.Ornninsky N.V. Slag plant installation of the blast furnace shop of the N-Tagil Metallurgical Combine. Collection Questions of slag processing. Chel Binsk, 1960, p. 367-370. 3. USSR author's certificate 547410, cl. C 04 3 5/04, 1975 / L / l at 3