SU251437A1 - METHOD OF GRANULATION OF FIRE-LIQUID MELT - Google Patents

Description

There are known methods for granulating a fiery liquid melt, such as slag, by exposing it to a mixture of water and gas.

The aim of the invention is to obtain dry, saparized, grained slag of increased hydraulic activity.

This is achieved by the fact that a fiery liquid melt is exposed to an inert iraaoM, for example nitrogen, which is passed through a super-sounding nozzle into which water is injected in an amount of 0.5-0.9 meters and 1 g of melt.

At the same time, water is forcibly supplied before the critical section of the soyl, which achieves maximum dispersion of water into the nozzles and cooling it down to negative temperatures, corresponding to their supersonic flow pattern.

At the exit of the nozzles, the jets form a mist-like directional flow, which has a high speed, low temperature and contains water in dispersed form. When the fog-like flow is directed at a small angle of attack on the flow of the raoplav, there is an instantaneous rupture of the latter into small particles as a result of the combined effect of three factors: explosion-like evaporation by low-temperature dispersion of water, a shock break by the high-speed flow, and the effect of deceleration of the supersonic flow.

instantaneous increase in the viscosity of the melt, contributes to its brittle rupture, in which the particle size depends on the speed of supersonic flow.

As a result of the rupture, the already partially cooled melt particles are captured by the air flow and, due to the minimum size, are rapidly cooled. The cooling of particles is accelerated by the addition of fine water (evaporative cooling).

M | The gnogenic rupture of the melt into particles of minimal volume and their rapid cooling slow down the development of diffusion and

crystallization processes in the mass of the melt, transferring the compounds in the melt to the most active crystalline and glassy structure. At the same time, it is completely dry.

granulated slag retaining its hydraulic activity.

The use of bent gas eliminates clogging of sulfur compounds formed during the granulation of steam, and it can be used for various purposes without additional purification.

Melt particles in the flow of the cooling room fall out at different parts of the flow. The latter makes it possible not only to settle the metal accompanying the slag melt, which is impossible when using the known methods of granulation. It was established experimentally that the procession of the melt metal granulation in the proposed method proceeds calmly, with the formation of fine grains. Due to the melt rupture in the process of the SHININ granules in the smallest particles, the separated metal does not contain slag inclusions.

Conducting melt granules in accordance with the proposed method in an airtight chamber under vacuum created by a suction device provides for regulation of the process of separation of slag and metal grains, as well as the possibility of carrying out the process in the immediate vicinity of the melt production from the melting furnace. The resulting product can be cleaned with a continuous conveyor, including the container one.

The following parameters of the process of granulation according to the proposed method were carried out at an econimental installation:

Air pressure, at2.0-6.0

Air consumption, lithium / g melt 60-80

The water pressure from (must exceed 1 at

3.0-7.0 air pressure)

At an air pressure of 3.0 and water of 4.0 atm and granulation using the specified parameters of blast furnace slag melt at a temperature corresponding to a viscosity of about 10 poise, grains with a moisture content of 0.2% and

average size of 0.8 mm, but not more than 1.5 mm. With graiul tsni steelmaking slag spread with a high metal content, the average size of the slag reed is 0.5 mm, and the grains of the metal are up to 3.0 mm.

Subject invention

A granulation of a fire-liquid melt, such as slag, by exposing it to a mixture of water and gas, characterized in that, in order to obtain a dry, separated, granulated flakes of increased hydraulic activity, a fire-liquid melt is exposed to an inert gas such as Rome: R, passed through a supersonic nozzle, in which water is injected in the amount of 0.5-0.9 m pa 1 ton of melt.