SU62688A1 - Furnace for the redistribution and preparation of slags - Google Patents

Description

Blast furnace slags are currently used to make molded products, slag wool or granulated slag from them. Containing, the sulfur in the slags is about 2% and the molten iron about 3-4% is lost.

A furnace is proposed for the processing and preparation of slag for the manufacture of products from it by the addition of appropriate additives, if required, and the homogenization of the molten slag by passing air through it and mixing with stirrers, as well as for trapping these impurities from the slag.

The furnace is in the form of a rotating round melting oacceSia heated by burners. In the vertical wall of the basin at various distances from the bottom there are several outlet openings for the production of slag and similar materials, and at the very bottom there is a taphole for the production of pig iron, heavy or other parts of the melt. For mixing and homogenization of molten slag-like .viaccbi, special pipes are introduced into the furnace basin through windows, through which air is blown into the molten mass.

The furnace is equipped with a gas outlet to remove the gases containing sulfur oxide, which are formed when flushing. To prevent gas loss, the furnace is equipped with a sand or hydraulic shutter.

The outlet openings in the furnace are located at different heights so that the molten scrap can be discharged gradually at the same flow rate. The required temperature in the furnace is maintained by means of gates overlapping the tubes of gas burners.

FIG. 1 is a vertical sectional view of the furnace along A-A in FIG. four; in fig. 2 - view of the furnace in plan; in fig. 3 is a section through the furnace through the windows and in FIG. 4 - section of the lower part of the homogenizer.

The middle part of the furnace, which is a liquid slag receiver and has a cylindrical shape, consists of a smelting pool rotating around its vertical axis. The bottom 2 and walls 3 of bass No. 62688-2 of seina / are supported on rigid, made up of double-sided beams and strip iron, pallet 4 resting on the periphery of the sgens on the annular frame 5. The central part of the basin / is supported on the bearing 7 fixed on the foundation pole 6 The basin is rotated by means of a ring gear 8 connected to gear 5 driven by a motor with a gearbox.

The upper part of the melting chamber / O and the subsurface space 11 are fixed and resting on the outboard brackets 12 mounted on the columns 13. The burners 14, 15 rest on the arches of the regenerators 16, 17.

The upper stationary part of the furnace 10, 11 and the rotating pool 1 are interconnected by means of a sand gate 18, which creates conditions for sealing the middle part of the furnace to prevent cold air from flowing through the groove 19. To this end, a channel trough is fixed around the circumference of the upper part of the pool rotating with the pool /, and at the suspended structure supporting the stationary wall of the melting chamber 10, along the entire perimeter of the ring there is a reinforced rib made of heat-resistant steel, dipping into the sand poured into yellow b shutter; In some cases, if special tightness is required, sand may be replaced by an alloy of low-melting metals.

In the central part of the roof of the furnace, there is a circular outlet opening, equipped with a gas outlet pipe 20 made of heat and acid resistant steel, or a special refractory (in the colder part, the gas outlet can be made of lead). The gas outlet is designed to take away from the melting chamber 10 and the underflow space // sulfur dioxide, which is formed during the blowing of the liquid slag mass.

In the walls of the rotating part of the pool furnace, a cascade of feeders is laid out. The cascading arrangement of the feeders allows the slag mass to be released from the pool, starting at the level of the uppermost feeder 23a and ending at the level of the lowermost feeder 23 through the holes 21 with the help of special plungers. The plunger control can be mechanical or manual, depending on the requirements for the product (for example, for granulation of slag - manual, for methodically producing slag droplets - mechanical, by automatic, as is the case in bottle production and production of varietal dishes glass).

For the production of liquid iron, shown in the form of a layer 24, the rotating pool / has a tap-hole 25 located between the feeders.

The rotating basin / is also equipped with a special fork-shaped homogenizer 26 (see Figs. 2 and 3), which is immersed in the slag mass during certain periods of operation of the furnace; The generator consists of elements 27 forked in a single unit; a separate element of the homogenizer consists of two pipes of heat-resistant steel; the outer 28, the bottom closed with cooled water, and the inner 29 below the open for blowing the compressor air into the slag mass. Air is blown in the first period of slag processing to trap sulfur, and final homogenization in the second period of slag processing. The homogenizer is introduced into the furnace basin through the window 30. The homogenizer can be fixed or moved by means of a mechanism from the center to the wall and back. The homogenizer is connected to water and air communication by flexible hoses.

In the first period of slag mass processing, air is supplied through the homogenizer for burning off sulfur; in the second period of redistribution, after the removal of sulfur (which is established by rapid analysis of gas samples taken from the gas outlet 20), intense mixing of the liquid slag mass occurs as a result of air being blown through the inner tube 28 of the homogenizer. In addition, the mixing of slag stock contributes to the movement of the homogenizer from the wall to the center and back, and the rotation of the pool; The slag mass is agitated, to the foot that it is repeatedly and variously cut by the elements of the homogenizer.

Before the operation begins, the furnace is heated to a temperature of 1200-1300 ° C, then 22 feeders 23 and a letke 25 are closed into it, and liquid slag is poured through window 30 when the tungsteners 22 are closed. When the slag is very hot, the furnace is left for some time to settle the iron, which is discharged from the pool through the tap hole 25. Then the burners 14 and 75 are turned off using the tongs 32 and the gas outlet 20 is opened and the homogenizer 26 is installed through the window 30. It is boosted (estimated speed depending on the pool diameter from 2 to 6 revolutions per minute) and air is fed into the homogenizer to decompose calcium sulfide into air. This forms calcium oxide and sulfur dioxide, trapped through the gas outlet 20 into the absorbers. After the oxidation of sulfur, the burner 14 and 15 are put into operation. A flame is supplied to the furnace, and the necessary additives are introduced through the free window 30. The process of dissolution of the additives in the slag mass is carried out using a homogenizer and rotation of the pool.

By periodically sampling, mass readiness is determined. Depending on the product being produced, the mass is left at rest when the homogenizer is removed from the pool or it can be immediately released into production, for example, for granulation.

To this end, the rotation of pool 1 is stopped and it is set to a working position corresponding to the location of the first feeder 23a along the axis passing through the pool from the axis of the burners, as shown in the plan of FIG. 2. The release of slag mass begins through the first feeder 23a, then through the second, and so on, until all the slag mass is released from the basin; after discharging slag from each level, the basin is turned 1/6 of a circle so that the next feeder becomes in the same working position as in the first feeder 23a.

After the slag mass has been discharged to the bottom of the sixth feeder, residues of non-oxidized iron are blown out by blowing air through the bore hole 25, after which the slag is closed, and the furnace is ready to receive a new batch of slag.

The heating of the furnace is regulated by the supply of gas and air to the furnace with a 20-30 minute switch over, depending on the viscosity of the slag mass and the conditions of its generation.

Subject invention

Claims (4)

1. A furnace for the preparation and redistribution of slags and the like of materials in a molten state, characterized in that it consists of a rotating rotary smelting pool / heated by burners 16, 15 whose vertical wall is provided with different distances from bottom holes for scrap metal and the like of materials, and at the very bottom a tap hole 25 for the production of pig iron and the like of heavy parts of the melt. - 3 - № 62688 2. The furnace configuration according to claim 1, characterized in that for mixing and homogenizing the molten mass in the pool, air pipes introduced through the windows 30 and immersed in the mass (homogenizer 26) are applied, progressively alternated, and deeper into the pool for better mass mixing . 3. In the furnace according to paragraphs. 1, 2, for the purpose of withdrawing gas from the gas mass, the gas outlet 20, the hydraulic or sand gate 18 and the channels of the burners of the gates 32 that shut off the channels for disconnecting the furnace from the chimney. 4. In the furnace according to paragraphs. 1, 2, 3 use of feeders or the like, devices 23 for uniform mass release from the pool. § five I I