What is the process of making hollow bricks?

(1) raw material processing

The processing of raw materials is very important for the production of high-strength, high-quality porous bricks, hollow bricks, so the raw materials need to be strictly processed, in order to get sufficient homogenization, mixing, crushing.

Shale raw materials need to be crushed in order to make bricks, generally to the second level of crushing is good, after the wheel milling machine practice mud aging, can improve the plasticity and molding degree. Shale crushed particle size can be different according to the different products put forward different requirements, in general, the production of ordinary shale bricks, the maximum particle control in the following 2.5mm; the production of porous bricks and hollow bricks, the maximum particle control in the following 2mm. The crushed raw materials are fed evenly, stirred with water and aged in the aging bank before being sent to the molding section.

(2) aging library

Aging is to grind the material to the required fineness and add water to moisten, so that it is further sparse, prompting the distribution of water evenly. Not only can improve the molding properties of raw materials, but also can improve the drying properties of raw materials, improve product quality. Process design selection of aging library, so that the raw materials to ensure that more than 72 hours of aging time, aging treatment of mixed materials through the bucket excavator into the box feeder buffer treatment, uniformly into the twin-axis mixer and then appropriate water mixing, so that its moisture content to meet the molding requirements.

(3)Extruding and billet cutting

After the second water mixing, the raw materials are sent to the double-stage vacuum brick extruder for extruding and molding, and after the molded clay bar is treated with surface treatment, it will be cut by the automatic strip cutter and automatic billet cutter into the brick billet of the required size, and then be transported to the yarding place by the billet carrying belt machine and be yardsed to kiln car by hand.

(4) Roasting

Roasting is the key process of production, and it is carried out by "high efficiency and energy-saving tunnel kiln with medium section". Before roasting, drying, drying in the tunnel drying kiln, tunnel drying kiln kiln length of 95.55 meters, sandwiched between the two tunnel kilns, the use of tunnel kilns generated by the waste heat for drying. Tunnel kiln **** two, 92.84 meters long, inner width of 2.5 meters, can meet the gangue block (discount standard brick) / year output requirements.

Good brick billet kiln car will be sent to the drying kiln drying, drying time of 24 ~ 26 hours, drying kiln heat source from the waste heat of the kiln, drying good brick billet with the kiln car into the roasting kiln, the firing temperature of 700 ~ 780 ℃, firing cycle of 27.75 hours.