RU2578619C1 - Apparatus for processing molten slag - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention can be used for processing molten slag to produce broken slag. Apparatus for processing slag melt comprises a receiving funnel, hake drum with ties for grates and partially filled with working bodies, case with drawing and device for discharge of finished product. Apparatus is equipped with disc comb, and grates in form of separate sections arranged with clearance, are fixed on end walls of drum and rest on ties. Between fire bars lowered teeth disc comb at a depth of 0.5-0.7 height grates. Bars have ledges in form of teeth arranged in staggered order in section from one to three on each grate. Device for unloading ready product is made in form of scraper water-cooled conveyor scrapers, which are connected to form a cavity for formation of ready product.

EFFECT: higher efficiency and improved conditions of maintenance of apparatus.

1 cl, 1 dwg

Description

The invention relates to the metallurgical industry and can be used for the processing of slag melts.

A known installation for the processing of metallurgical slag [1], containing a casting trough made in the form of fixed longitudinal grates, forming an open cylindrical surface with disks mounted on a rotating axis and interconnected by shelves perpendicular to the fixed grates and placed in the gaps of the cylindrical surface. The shelves are installed with a gap to the grate of no more than 0.5 of the minimum size of metal balls, the distance between the shelves is 0.1-0.3 of the circumference of the disks, and their height is 1-3 of the maximum size of metal balls, and the size of the connectors of the cylindrical surface is at least one distance between the shelves.

Common with the proposed device signs:

- the presence of longitudinal grid-irons forming an open cylindrical surface;

- the presence of metal bodies that act as a cooling device;

- the presence of end disks connected by shelves;

- the presence of grid-irons, with the help of which separation of the settled slag from metal balls is carried out.

The achievement of the expected technical result is hindered by:

- insufficient mass of working bodies located on the surface of the grid-irons for cooling the melt, to increase it, it will be necessary to limit the size of the connector of the cylindrical surface, increase the number of shelves, while the loads on the shelves, due to which the balls move, will require great efforts to move the balls;

- the lack of a mechanism for cleaning the grate from the melt and the destruction of the slag crust that fell on the grate;

- with increasing intensity of the discharge of the melt into the installation does not exclude the possibility of its passage through the grates without adequate cooling.

The closest technical solution to the proposed invention by its technical nature and the achieved result is a plant for processing slag melts [2], containing a receiving funnel, a grate with flanges and a horizontal axis of rotation, partially filled with working fluids, the grates are placed on screeds parallel to the flanges forming the end faces the walls (disks) of the grate drum with a variable pitch within 0.1-0.6 of the smallest size of the smallest working fluid placed in the grate trophies for receiving and distributing slag melt, screeds are evenly spaced from each other by a distance not less than the width of the receiving funnel, and the receiving funnel is placed above the working bodies along the line of their slope.

Common with the proposed device signs:

- the presence of grates, placed on the screeds parallel to the flanges, forming the end walls of the grate drum;

- the presence of the end walls of the grate drum connected by couplers;

- the presence of a receiving funnel located above the working fluid.

The achievement of the expected technical result is hindered by:

- design and placement of grates that do not provide their protection against thermal and mechanical deformations;

- the lack of a mechanism for cleaning the grate from the settled slag, this will limit the passage of the melt into the grate drum and the output of hardened slag from it;

- the lack of a mechanism that protects the grate from hardened slag crusts, which will prevent the passage of the melt through the grate and clutter the receiving funnel.

The expected technical result is:

increasing the productivity of the process of processing the melts, reliability, service conditions and repair of the installation.

The problem is solved in that in the installation for processing slag melts, including a receiving funnel, a grate, partially filled with working fluids, a hood with a hood and a device for shipment of the finished product, the surface of the grate is made up of separate sections, the sections are placed with a gap, rest on the screed and mounted on the end walls of the drum, between the grates the teeth of the comb are lowered to a depth equal to 0.5-0.7 of the height of the grates, the grates have protrusions in the form of teeth arranged in a checkerboard pattern in sections from one to three on each grate, the device for shipping the finished product is made in the form of a water-cooled scraper conveyor, the scrapers of which are conjugated and form cavities for forming the size of the finished product.

The causal relationship between the set of essential features of the device is as follows. The grate surface, composed of separate sections with a gap, is less susceptible to thermal and mechanical deformation, since variable temperature and power loads during rotation of the grate drum do not affect the entire grate surface at the same time, but on each individual section. The gap between the individual sections allows not only to compensate for possible deformations from exposure to variable loads, but also contributes to a better passage of the melt into the drum cavity, cleaning the grate from slag accretions and the destruction of crusts that have fallen on the surface of the grate. Separate sections of grid-irons are easier to mount during installation and easier to replace when repairing the installation. Reliance on the screed and securing each section on the end walls of the drum combines the grate sections, the end walls and working bodies placed in the grate drum, and gives each grate section an inertia moment sufficient to break down the slag crusts and tear away the accretions from the grate surface. The presence of teeth arranged in a checkerboard pattern in the section from one to three on each grate ensures the movement of slag crusts to the teeth of the comb placed between the grates at a depth equal to 0.5-0.7 of the height of the grate, and the subsequent destruction of the crusts. The presence of a device for shipment of the finished product, made in the form of a water-cooled scraper conveyor, the scrapers of which are conjugated and form cavities for forming the size of the finished product, allows not only to remove the cooled slag from the installation, but also to give it a shape that is formed by the conveyor scrapes conjugated with each other and further cool the formed product.

One of the options for the installation for processing slag melts is shown in the drawing. The installation contains a receiving funnel 1, a grate 2, partially filled with working bodies in this case with balls 3, a casing 4 with an exhaust hole 5, the surface of the grate is made up of separate sections 6, which are supported by ties 7 and fixed on the end walls of the drum 8. Between the grates sections of the teeth are omitted, in the above example, a disk comb 9. The device for shipping the finished product is made in the form of a water-cooled scraper conveyor 10, the scrapers of which form cavities (see callout I) to form a size and shape of the finished product.

Installation works as follows.

The slag melt from the intermediate tank is poured into a funnel 1, through which it enters the grate surface of the drum 2, passing through the grate, the melt enters the surface of moving metal bodies (balls) 3 and into the inter-ball space, giving off heat to the metal bodies, the melt cools, hardens and freezes on the surface of the balls. Passing between the grate, the melt heats them. Under the influence of high temperatures, the grate is deformed, expanded. Given that the grate surface is open and composed of separate sections arranged with a gap, each section is subject to deformation to varying degrees, depending on what position it is in and what thermal and dynamic loads affect it. Interacting with each other and with the grid-irons of sections 6, the balls are released from the slag that has come upon them. Slag passes through the grates and enters the water-cooled scraper conveyor 10 in the cavity formed by the conjugated scrapers. Considering that not the entire volume of slag melt at the outlet of the grate drum has hardened, part of it is still in a viscoplastic state, it is subject to plastic deformation and, using a load placed above the conveyor, fills the cavities formed by scrapers. Moving along the scraper conveyor, the slag is additionally cooled and, due to a change in the profile of the trajectory of the scraper, falls out of the cavities, acquiring a finished shape and size. The idle branch of the scraper conveyor is immersed in a bath of water, here it is cooled and returned under the grate drum to receive another portion of slag. When the slag melt is drained, due to a sharp decrease in temperature, part of the melt hardens in the form of crusts and deposits on the grate. To destroy the slag crusts and clean the inter-grate space, structural elements in the form of a comb 9 with teeth and teeth on the grates, staggered in sections 6 from one to three on each grate are introduced into the installation. The teeth of the comb are lowered into the inter-spike gap to a depth of 0.5-0.7 of the height of the grid-irons. This size of the depth is selected based on the need to fix the grate in each section. A part of the inter-gland space is cleaned up due to interaction with the teeth of the comb, a part of the inter-gland space, to which the teeth of the comb do not reach, will be cleaned when exposed to working bodies - balls. Slag crusts that hit the surface of the grate, under the action of the protrusions of the teeth on the grate, will advance to the teeth of the comb and due to inertia, when the teeth of the grate and comb are mated, they will collapse. Destroyed crusts can fall into the grate drum 2, or, bypassing it, on the scraper conveyor 10 and will not interfere with the passage of the melt through the grate. The side walls of the funnel 1 are planted between the end walls 8 of the grate drum 2, this eliminates the spillage of the melt past the grate drum. The casing 4 of the installation is used to protect against thermal radiation, the emission of melt splashes, and from the noise of moving balls. It is used to collect steam and gas emissions and is equipped with a chimney 5. In the casing are installed estrus for unloading slag on the device for shipment of the finished product 10.

Installation for processing slag melts allows you to process melts with different initial rheological properties and to obtain from the melt a wide range of marketable products.

List of sources used

1. Patent RU 2044712. Installation for the processing of metallurgical slag. Published September 22, 1995.

2. Patent RU 2234536. A method for processing melts and an installation for its implementation. Published 08/20/2004.

Claims (1)

Installation for processing slag melts containing a receiving funnel, a grate drum made with screeds for grates and partially filled with working fluids, a hood with a hood and a device for shipping the finished product, characterized in that it is equipped with a disk comb, while the grate is in separate sections placed with a gap, mounted on the end walls of the drum and rest on the screed, and between the grates the teeth of the disk comb are lowered to a depth of 0.5-0.7 of the height of the grates, while the grates have a protrusion in the form of teeth, staggered in a section from one to three on each grate element and the device for shipment of the finished product is designed as a water-cooled scraper conveyor, which scrapers are associated with the formation of the cavity to form the finished product.

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