SU988793A1 - Batch for making refractories - Google Patents

Description

(54) CHARGE FOR PRODUCTION OF REFRACTORIES

one

The invention relates to refractories, including compositions for the manufacture of corundum graphite products, which can be used as refractory steel-casting supplies, for the repair of linings and other purposes in the metallurgical industry.

The known charge for the manufacture of refractories, including, wt%: corundum filler 50-62; graphite 20-30; silicon carbide 3-8; silicon 1-7; binding 1-5; chromium oxide 5-17; clay 8-16 1.

The disadvantage of this mixture is low mechanical strength.

The closest technical solution to the present invention is the charge 2 for the manufacture of refractories, including the following components, wt.%:

Clay10-15

Flake graphite25-35

Metallic silicon8-10

Liquid sodium

stekloOD-0,7

ElectrocorundumEverything

Products from the known charge have higher strength properties.

However, due to the fact that the binder is represented mainly by glass-forming elements, the batch products have a lower thermal resistance. Slag-resistant. The charge of products from the charge is also reduced.

The purpose of the invention is to increase thermal stability, metal and slag resistance of products while maintaining high mechanical strength.

The goal is achieved by the fact that the charge for the manufacture of refractories, including

15 electrocorundum, clay, flake graphite, silicon metal and liquid sodium glass, additionally contain coal tar in the following ratio of components, May. %:

20

Elektrokoru143-47

Clay2-6

Flake graphite18-22

Metallic silicon 7-, P Liquid sodium glass 4-6 Pie carboniferous 16-18 The introduction of high-temperature coal-tar pitch into the composition of the charge leads to the formation of a durable carbon skeleton not wetted by steel and slags. Introducing liquid sodium glass together with coal tar pitch as a binder into the charge mixture allows to obtain high mechanical strength and heat resistance after firing products, as well as reduce carbon burnout in the service. In addition, the silicon carbide obtained in the course of firing as a result of the interaction of coal tar pitch with liquid glass strengthens the product and increases their thermal stability. Example. 45% of electrocorundum are mixed with 20% of graphite, 9% of metallic silicon, 4% of refractory clay and 17% of high-temperature coal tar pitch, then the mass is moistened with 5% of liquid sodium glass with a density of 1.50 g / cm.

Composition, May. %: Electrocorundum fraction of 0.5 mm

fractions 0.16 mm

fraction 0.06 mm Flake graphite.

Cream} shy metal finely ground

High temperature coal tar pitch

Liquid sodium glass with a density of 1.50 g / cm

PRS

Clay refractory properties compressive strength,

KG / CM

18

27

20 29.3

25 18

20

25

22

ten

11 18

sixteen

0.7

15

480

500

420 4 From the resulting mixture, products are molded using the vibro-cast or semi-dry pressing method. In the case of hydrostatic extrusion, it is advisable to introduce electrocorundum in the form of fractions: 20% fraction and 0.16 mm, 25% fraction 0.06 mm; in the case of hydraulic pressing, electrocorundum is introduced in the following ratio: 20% fraction 0.5 mm and 25% fraction 0.06 mm. Products burned at 1380 ° C. The properties of the samples are given in the table, from which it can be seen that the refractory materials from the proposed mixture, compared with the prototype, have a higher heat resistance and slag resistance. Increasing heat resistance and slag resistance while maintaining a high mechanical strength of the products of the proposed mixture, in comparison with the prototype, allows to increase the service life of products, which increases even more, compared with the period of sponge products based on the base charge. The expected economic effect from the introduction of the proposed charge is about 55 thousand rubles. in year.

Sample Characteristics

Shredding, mm

Heat resistance (heat cycles), 1300 - water

Claims (2)

Invention Formula The mixture for the manufacture of refractories, including electrocorundum, clay, flake graphite, silicon metal and liquid and sodium glass, characterized in that, in order to improve heat resistance, metal and slag resistance of products while maintaining high mechanical strength, the following the ratio of components, wt.%: Electrocorundum 43-47 Clay2-6 Table continuation Prototype The proposed formulations shg 4.0 2 3.0 2 Flake graphite18-22 Silicon metal7-11 Liquid iatrieboe glass4-6 Coal tar 16-18 Sources of information taken into account during the examination 1. USSR author's certificate N 565902, cl. From 04 To 35/10, 1976. 2. USSR author's certificate If 541821, cl. C 04 B 35/10, 1974 (prototype).