SU79849A1 - A method of manufacturing a porous brick during conveyor firing - Google Patents

Description

A known method of making porous calcined bricks made from a mixture of clay and crushed coal by burning out combustible additives from it.

A feature of the invention is that baking bricks is produced on a grid conveyor by sucking flammable gases through a brick under the action of a vacuum created under the grid.

FIG. 1 shows a flow chart for the manufacture of bricks; in fig. 2 is a diagram of a lattice conveyor.

The technological process of making porous bricks is as follows.

Clay of usual quality is mined in open pit 1 by a milling excavator 2 and supplied by conveyor 3 in the clay depository 4. In case of need, the clay is dried to the moisture content in dryer 6, into which it is fed by conveyor 5.

Coal or coal from stock coal 1a is fed by conveyor 2a to the Za mill, in which it is ground to grains with a particle size of not more than 3 mm. The mixture of coal and clay in the right proportion is supplied by conveyors 7 and disintegrator 8, where the clay is ground and mixed with coal.

From the disintegrator, a mixture of clay and coal for better mixing is fed to a special mixer 9, previously passed through a sieve for screening out large fractions, which are fed to the secondary grinding to the disintegrator. The mixed mixture is heated by the exhaust gases in the heating chamber 16 and is fed to the press hopper 10. The exhaust gases are fed from the pilot furnace through pipeline 21.

The pressing of a brick from a mixture of clay and coal at a humidity of 8-120 / 0 is carried out in presses using the method of dry pressing.

No. 79849

From the press, the raw brick is picked up by a selection trap transporter 11 and a reload conveyor 12 onto a special ring conveyor 13 consisting of sections of a sintering grid of heat-resistant steel.

On conveyor 13, the raw material first enters the drying zone 17, where the raw material dries off waste, and with hot gases sucked from the burning zone. The raw material is then fed to a given zone (S), which represents a pilot horn, in which there is an intense combustion of gas supplied from outside. The gas flame ignites the coal pressed into the clay from the surface of the raw brick and, due to the strong suction of the exhauster 14, the process of burning and gasifying the coal contained in the raw material begins on the underside of the grate conveyor.

Further, moving on the conveyor sintering grids, raw material from the surface gets into the burning zone 19, where due to intensive suction of air by the exhauster 14, the combustion process spreads coal through the interior of the brick, high temperature develops and intense sintering of the pressed clay mass occurs.

After that, the hot brick enters the zone 20, where the cooling of the finished product gradually takes place - burnt bricks or light clay aggregates. The cooled brick is conveyed by conveyor 15 to the warehouse.

According to this method, the method of sintering is obtained by burning baked brick from the conveyor during two to three hours with complete mechanization of the process.

Subject invention

Claims (3)

1. A method of manufacturing porous bricks with a conveyor calcination made from a mixture of clay and crushed coal by burning out combustible additives from it, characterized in that the bricks are baked on a grid conveyor by sucking in it combustible gases due to the vacuum created under the grill. 2. A method according to claim 1, characterized in that the raw material is compressed from a mixture of clay and coal preheated by the exhaust gases. 3. A method according to claim 1, characterized in that the raw brick released from the press is pre-dried with flue gases from calcining followed by ignition of coal in the raw burnt chamber in the upper layers of the raw material. DnDCDDCDDDI daaoshshshsh fuiS