SU1065380A1 - Method for making aggloporite - Google Patents

Abstract

A method for producing agglory powder, including preparing a mixture of clay raw materials, fuel, lignin and oil, mixing these components of the charge, granulation and sintering, characterized in that in order to increase the strength of the aggloorite and increase the productivity of the sintering plant by increasing the vertical sintering rate before preparing the mixture, the lignin is pressed under a pressure of 20–25 kg / cm, granulated by squeezing through a perforated grid with a hole size of 5–7 mm, and then dried to a moisture content of 13– 15%. about s

Description

"Ate

with

00 The invention relates to the productivity of building materials and can be used for the production of a porous aggregate aggrrite. A known method of producing agloporite by preparing a mixture of clay raw material, fuel, lignin and return, mixing these components, granulation and subsequent sintering of the obtained Cl line} The closest in technical essence to the invention is a method of obtaining agloporite, .including the preparation of a mixture of clay with fuel, fuel, lignin and return, mixing of the components, granulation and subsequent sintering. In addition, in the known method, it provides for separate granulation of lignin with coal to a fraction of 0.5-10 mm, and the charge to a fraction of 5-15 km, and the granules of the mixture are dried to 1212.5% 2. The lack of known methods for producing agloporite is insufficient helical speed sintering and strength of the resulting agloporite. This is so. That in the process of granulating ligyne with coal, the granules are not sufficiently strong and non-uniform: in terms of grain size (fraction 0.510 m). Small particles of lignin (fractions of 0.5-3 mm / while mixing the mixture are covered with the granules of the charge and burned faster, which does not create the necessary combustion sources, which displace the fusion of the granules among themselves. This adversely affects the vertical sintering crushiness and transparency of agloporite, The aim of the invention is to increase the strength of the agloporite and increase the productivity of the sintering plant by increasing the vertical sintering rate. This goal is achieved by the method of obtaining aglr pori This, including the preparation of clay from raw materials, fuel, lignin and return, mixing these components of the charge, granulation and sintering, before preparing the mixture, the lignin is pressed under a pressure of 20–25 kg / cm and the extrusion paths are perforated through a 5-7 hole size grid. mm, and then dried to a moisture content of 13–15%. The method is carried out in a cadmium manner. Lignin is loaded into a press using a belt conveyor, where it is pressed under pressure of 20–25 kgf / cm and {pressed through a perforated grid with a size 5–7 mm holes, the granulated granules are dried to a moisture content of 13–15% at 70–80 ° C. Then the clay raw material, coal, pre-prepared lignin and return are mixed in a clay mixer, the mixture is granulated in a drum granulator and sintered on the sintering mill. installation in a known manner. The described preparation of lignin by pressing it under pressure makes it possible to obtain fuel particles that are durable and uniform in grain size, which create a wide burning front, contribute to the development of high temperatures in the charge layer and thus provide conditions for fusing the charge granules together. As a result, the vertical sintering speed and strength of the agloporite significantly increase. The method is carried out as follows. Lignin is fed to a press using a belt conveyor, where it is pressed under a pressure of 23 kg / cm and forced through a perforated grid with 5 mm holes. Compressed granules were dried to a moisture content of 15% prn 75 ° C. . Then prepared a mixture of the following composition, wt.%: - clay raw materials 79.5) coal 2.5; pre-prepared lignin 6.0; refund 12.0. After mixing and granulation, the shnhta had a moisture content of 21-22%. Sintering was performed on a sintering machine with a length of 12 mm, a width of 1.5 m, and a layer height of 285 mm. The vacuum in the varum chambers during sintering was 200 mm water column. To obtain comparative data, a mixture of the same composition was prepared by a known method. The data on the known and proposed methods are given in the table.

Offered way

Indicators

Size of granules of lignin, mm

1.0-3.5 G 3.5-4.0 I 4.0-5.0

Vertical sintering speed,

16.0. mm / min

Squeezing strength, kgf / cm, fractions 10-20 mm

5-10 mm

- -

Known method

10.0-11.0

16.6

17.0

8.9-9.0

11.6 15.0-15.3 19.7

The selected limits for the pressing of lignin granules are optimal. Pressing the lignin granules under a pressure of less than 20 kg / cm does not provide the necessary strength of the granules. They are easily subject to destruction both during transportation and the drying process. An increase in the pressing pressure of granules in excess of 25 kg / cm is impractical, since the strength of the latter practically does not increase, while the power consumption for pressing increases significantly. The optimum moisture content of the prepared granules is 13-15%. At this humidity, the granules have sufficient strength and do not destroy during transportation and during the preparation of the charge. When the moisture content of lignin granules is more than 15%, they are discharged during transportation and preparation of the charge. Drying the granules to a moisture content of less than 13% is impractical because it does not cause them to be further strengthened, and the cost of heat for drying them increases. Lignin granulation can be produced by punching through a perforated grid with 5–7 mm openings, since granules of--5 mm in size, which are obtained after drying, have the greatest strength. From the data of the table it follows that during sintering of the charge to the proposed method, the vertical sintering rate increases by 58%, while the strength of the agloporite of the 5-10 mm fraction increases by 30%, the U20 mm fraction by 23%. The remaining indicators, characterized by the quality of agloporite, meet the requirements of GOST 11991-77 Agloportite crushed stone and sand.

Claims (1)

METHOD FOR PRODUCING AGROPORITE, including preparation of a mixture of clay raw materials, fuel, lignin and return, mixing of said components of a mixture, granulation and sintering, characterized in that, in order to increase the strength of sinter and increase the productivity of the sinter plant by increasing the vertical sintering speed, before preparing the mixture, lignin is pressed under a pressure of 20-25 kg / cm ² , granulated by pressing through a perforated grate with a hole size of 5-7 mm, and then dried to a moisture content of 13-15%.