SU1004301A1 - Method for making drain pipes based on wastes from coal concentration - Google Patents

Description

The invention relates to the luminance of building materials and can be used in the manufacture of ceramic products, mainly drainage pipes from coal waste.

A known method of making ceramic drainage pipes from waste. coal mine. by grinding, wetting to molding moisture, molding, drying, and roasting at 850 EOO C in an oxidizing environment for burning carbon 11.

The closest to the present invention is a method of manufacturing porous ceramic products based on coal waste by grinding raw materials, dividing into fractions of 0.52, 0 mm, 0.1-0.5 mm and less than 0.1 mm, mixing, wetting before molding. humidity 19-22%, molding, drying and roasting C2.

The disadvantages of these methods are the long duration of calcination of products, low frf, resistance, strength and frost resistance of products.

The purpose of the invention is to reduce the duration of firing, increase strength and frost resistance, and increase pipe porosity.

This goal is achieved by the fact that according to the method of manufacturing drainage pipes based on coal preparation waste by grinding the raw material, dividing into fractions 0.5-2.0 mm ,. 0.1-0.5 mm and less than 0.1 mm, mix-. Wetting, moistening to the molding moisture of 19-22%, molding, drying and burning, before moistening to the forging moisture, the mixing is carried out in two stages; at the first stage, the fraction less than 0.1 mm is mixed with 20-45% fraction 0.5 mm and with 5-15% fraction 0.5-2 mm by weight

15 mixtures for 20-40 minutes, and in the second stage, the mixture is moistened with water to a moisture content of 11-13% and stirred for 1-1.5 hours.

20

The introduction of a certain amount: VA of coal preparation wastes of fractions 0.5-2.0 mm and 0.1-0.5 mm to the fine fraction less than 0.1 gives you the opportunity to increase open porn

25 of the semi-finished product. With an increase in temperature in the products, the open porosity first increases due to the formation of secondary porosity from carbon burnout and then

30 decreases due to the start of sintering

ceramic shard, i.e. carbon burnout rate is reduced.

The specified technological methods; mixing fractions, moistening the powder to maximum molecular saturation (11–13%) and mixing for 1–1.5 h ensure the formation of a semifinished structure in which the processes of secondary porosity and sintering of ceramic fragments go equilibrium. The balance of these processes makes it possible to obtain products with completely burnt carbon in a ceramic crock for a shorter roasting time and high physicomechanical indicators.

Example 1. Waste of coal preparation (rock) after grinding is divided into Fractions 0.5-2.0 mm, 0.1-0.5 mm and less than 0.1 mm. To the fraction less than 0.1 mm, 45% of the fraction 0.1-0.5 mm and 5% fraction 0.5-2.0 mm are added and stirred for 20 minutes, moistened to 13% (wt.), And stirred for 1.5 h. After that, it is moistened to 22% and from the resulting mass molded on a laboratory vacuum press, the sample cylinders with a size of 30 x XO mm. Dried and burned by famous methods.

Example 2. The coal preparation waste after grinding is divided into fractions 0.5-2.0 mm, 0.1-0.5 mm and less than 0.1 mm. 20% fractions of 0.1-0.5 mm are added to the fraction less than 0.1 mm and stirred for 40 minutes, moistened to 11% (wt.) And stirred for 1 hour. After that, it is moistened to 19% and from the resulting mass is molded on a laboratory vacuum press using sample cylinders of size 30. 30 mm. Dried and burned by famous methods.

Example 3. Coal preparation waste after grinding is divided into fractions 0.5-2.6 mm, 0.1-0.5 mm and less than O, 1 mm. To fraction less than 0., 1 mm

30%, fractions 0.1-0.5 mm and 10% fractions 0.5-2.0 mm are added and stirred for 30 minutes, moistened to 12% (wt.) and mixed for 1 hour 20. min After that, moisten up to 20%.

and from the resulting mass is formed on a laboratory vacuum press samples-cylindrical size mm. Dried and burned by famous methods.

Comparative data and properties

raw and burned samples obtained by the known and proposed methods are presented in tab.1.

According to the proposed method, Drencher ceramic ceramic pipes 50 mm in diameter were also formed. Comparative results of the duration of firing and physico-mechanical parameters of pipes are given in t ab.2.

Thus, the proposed method makes it possible to increase their porosity by 5–9%, strength by 6.0–9.0 Pa, frost resistance by 2–4 times and reduce the duration of roasting by 5–7 h compared with the prototype products.

23.0

30.0

Prototype

49.0

31.0 43.0 28.0 46.0 29.0

Table 1

40

25.0

900

35.0

48 52, 30.0 32.0 50

27

Claims (2)

Prototype Proposed Formula of Invention A method for manufacturing drainage pipes based on coal preparation waste by grinding raw materials, dividing into fractions 0.5-2.0 mm, 0.1-0.5 mm and less than 0.1 mm, mixing, wetting to the formation humidity 19-22%, molding, drying and burning, about aphid and with the fact that, in order to reduce the duration of burning, increase strength and frost resistance and increase the porosity of the pipes, they are mixed in two before moistening to the molding moisture. stage, at the first stage the fraction of men is stirred its 0.1 mm with a 20-45% fraction of 0.1-0.5 mg and 5-15% of the fraction table 2 15-25 27.0 0.5-2. Mm from the weight of the mixture for 2040 minutes, and in the second stage, the mixture is moistened with water to a moisture content of 11-13% and stirred for 1-1.5 hours. Sources of information taken into account during examination 1. Shlykov A.V. et al. About the influence of some factors on the kinetics of carbon burnout in ceramic products from waste of coal preparation plants; Sat Proceedings of VNIIstrom. Artificial porous plastics and ceramic materials, Moscow, 1975, no. 33 (61), p. 3-15. 2. Burmistrov V.N. et al. Production of ceramic drainage pipes from waste coal .- Coal, 1981, 1, p. 56.