SU420587A1 - INSTALLATION FOR OBTAINING CRUSHED FROM MOLTEN METALLURGICAL SLAGS - Google Patents

Description

one

The invention relates to installations for the production of building materials from molten metallurgical slags, in particular for the production of rubble, and can be applied in the processing of slags directly at the metallurgical enterprise.

A known device for producing spine, ebn from molten metallurgical slag, consists of, and from a melt channel, a spinning drum, with a grooved trapezoidal surface and a receiving device.

The purpose of the invention is to obtain w, ebn a given fractional composition.

For this, it is suggested to install the drum at an angle of 4-20 ° to the horizontal plane.

FIG. 1 shows schematically the proposed installation; in fig. 2 is a section along A-A in FIG. one.

The installation consists of a groove 1, a rotating drum 2 with a grooved surface 3 of trapezoidal shape, set at an angle of 4-20 ° to the horizontal plane, and a receiving device 4.

Slag melt is fed along chute 1 to the upper end of rotating drum 2 and fills part of its grooved surface 3. After that, the drum rotates through a certain angle and the slag melt fills the next part of surface 3. The previous slag layer solidifies. When the friction angle of the crystallized slag against the metal is exceeded due to the rotation of the drum, it is fed to the receiving device by the action of its own weight.

As a receiving device can be used as a vibrating trough, and a conventional bunker. Drum tilt angle varies from 4

up to 20 ° to the horizontal plane. This is determined empirically. When the drum is inclined more than 20 °, slag pieces are unevenly thick, and a small part of them is broken off on impact. When the drum is tilted

less than 4 °, the effect is the same as when the slag is poured into horizontal molds, i.e. as the slag moves away from the place where the jet falls, the layer becomes thinner and thinner.

In the pilot plant with a drum with a radius of 86 mm and a tilt angle of 4 ° with a stream of molten slag 2 tons / hour, the slag filled the grooved surface at a speed of 40 mm / sec and solidified from a layer of 16 mm, and at an angle

the drum inclination was 20 °; the slag flow rate over the drum surface was 60 mm / s and the slag solidified with a layer thickness of 8 mm. The temperature of the slag under study was 1250–1300 ° C, and the chemical composition is as follows,%:

CaO-28.6; SiOa-36.1; ABOz-Eb; MgO-15.5;

MnO-3,8; FeO-2,8; Robshch-2,2; S-0.44; РгОв-0.88.

The movement of the drum is provided for automatically. For this, an optical photocell is installed above the filled surface (in its lower part). When filling the grooved surface of the drum with slag, the photocell gives a signal to the actuator of the drum movement. Moreover, the distance from the lower end of the grooved surface to the photocell is selected experimentally, ensuring the slag spill after stopping its supply to this surface and excluding slag overflow to it. Taka

automation allows the processing of oscillating volumes of supplied liquid slag.

Subject invention

An apparatus for producing crushed stone from molten metallurgical slag, containing a chute located under its drain

with a toe, a drive drum with a grooved trapezoidal surface and a receiving device, characterized in that, in order to obtain crushed stone of a given fractional composition, the drum is set at an angle of 4-20 ° to the horizontal plane.