SU1406129A1 - Method of producing expanded clay aggregate - Google Patents

Abstract

The invention relates to the production of building materials and can be used for. manufacture of expanded clay from clay raw materials. To reduce the bulk density of haydite, the method involves preparing a clay slurry, dewatering, granulation and roasting, and the slurry with a moisture content of 40-50% is dewatered and homogenized with flue gases on the surface of the rotating rolls. The resulting claydite from weakly-clayey raw material is characterized by a bulk density of 295-300 kg / m, compressive strength 0.90-0.91 MPa. G tab. with (L

Description

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The invention relates to the production of building materials and can be used to make expanded clay from clay.

The purpose of the invention is to reduce the density of expanded clay on expanded clay.

The drawing shows a device for implementing this method.

The device contains a shaft of rectangular cross section 1, the loading device is a screw feeder 2, hollow rolls 3 arranged in a staggered pattern, which are rotated from a single drive due to a chain transmission, pressure rollers 4 and a shear device 5 transfer of flue gases and installed above the clay mixer 6.

For example, a slurry prepared from weakly shingling clay raw material with a moisture content of 40-50% is fed by auger feeder 2 to hollow rolls 3 arranged in chess order and rotating opposite to each other, ensuring transportation of the material being dried. The uniformity of application and the thickness of the layer of clay slurry are controlled by pressure rollers 4 and is 7-10 mm. The dehydration is carried out by using the heat of the exhaust flue gases entering the device by countercurrent through channel 7 with temperature ZOO-ZZO C. in the clay mixer. Then, the resulting plastic mass is granulated on a belt press or other forming equipment and in the form of granules is fed into a drying drum and then for firing.

Specific examples of the implementation of the method and the properties of the resulting aggregate are presented in the table in comparison with the known method.

Characterization Processing of clay suspension from the Mionovskaya clay

Moisture of the initial suspension,% Removal of particles of 1 O micron from the suspension (+ yes, - no) Sushydration of suspension-. Pensions to the residual molding moisture for the subsequent granulation of 5% 9 during: molding and crushing on the rollers of the tape with drying of flue gases by filtration (+ yes, no). Characteristics of semi-expanded clay, fr. 0-20 mm

Bulk density, kg / m

Strength, MPa

40 45 30

75

20 24. 27

23

-f 4293 298 300

400

0.90 0.91 0.91

1.6

314061

The method can be effectively applied for the processing of low- and medium-flowing clay raw materials.

on claydite,

I -5

The role of the rolls is reduced to drying and homogenization due to the destruction of the structure of the raw material during the transportation of the dried material. Drying is carried out due to thermal conductivity when the suspension contacts the hot surface of the roll and convection when the flue gas flows in countercurrent. The rolls, arranged in a checkerboard pattern, contribute to the intensification of the drying process of the clay suspension by increasing the heat exchange surface during the transportation of the dried material from one roll to another.

Tgt .,.

Compiled by V. Obraztsov Editor N, Shvydka Tehred M. DidykKorrektor O. Kravtsova

Order 3153/21

Circulation 594

 VNIIP.State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5

29

The material to be dried is transported by rotating the rolls towards each other. The supply of exhaust flue gases with countercurrent ensures that the surface temperature of the rolls increases as the clay slurry progresses.

Claims (1)

10 claims The method of obtaining expanded clay, including the preparation of a clay suspension, its dehydration, granulation and firing, characterized in that, in order to reduce the bulk density of the expanded clay, the suspension is dehydrated with a moisture content of 40-50% and is further homogenized with flue gases on the surface of the rotating rollers. , Subscription