SU814984A1 - Packing refractory mass - Google Patents

Description

(54) PAINT REFRACTORY MASS

one

The invention relates to the production of carbon-based refractory materials, namely, refractory masses used for lining blast furnace chutes.

The known mass for stuffing chutes of blast furnaces, consisting of coke, refractory clay and. coal tar pitch. The humidity of this mass is 8-14% G1

However, the mass due to the low erosion resistance of the liquid products of the blast furnace smelting and relatively high oxidation capacity does not provide sufficient gutter resistance.

The closest to the technical essence of the present invention is the mass for closing the cast-iron tap-hole of blast furnaces, consisting of 810 wt.% Refractory clay, 515 wt.% Coal tar pitch, 1520 wt.% Crystalline graphite and coke - the rest is 2}.

However, the mass has a relatively low strength, insufficient erosion resistance to the effect of liquid iron.

The purpose of the invention is to increase the strength, erosion resistance and oxidation reduction.

The goal is achieved by the fact that the refractory padded mass, including coke, refractory clay, coal tar pitch and graphite-containing material, contains graphitization of electrode production as graphite-containing material in the following ratio of components, wt.%:

5-55

Coke

Clay ogneupor15-30

na

Peck Kamenio 10-25 coal Okhrdy graphitization of electrode production 5-55

Moreover, the mass contains coal tar pitch with a softening temperature of 20 O –300 ° C. “.

HcnonbsyeNQjje waste graphitization of electrode production has the following chemical composition, wt.%: From 65.48 including C 33.0; SiOil3.61; SIC 9.54; AEgOz 5.21; TiOx 0.26. Fea.0j 3.85; CaO 0.46 MgO 0.32; S 0.69; K, 0 0.22; NaaO 0.26. Mass is prepared by conventional technology in runners. The moisture content of the prepared gutter mass is 8-14%. The mass can be used to close the cast-iron tap-holes, in this case the humidity should be 16-22%. If the letting mass was 1 to 6–10% moisture, it can be used to fill the cases of the black holes (case mass) of blast furnaces. Example. The initial components of coke, graphitization waste of electric production, coal tar pitch, and refractory clay are metered into runners and the dry mixture is worked through for 10-12 minutes. Then served: water and continue to work.

63

55 45 30 15

Coke Waste graphitization of electrode production5 15 Crystal graphite18 20 20 Refractory clay 9 Coal tar pitch with a softening temperature of 135-150 ° C 10 20 20 Coal tar pitch with a softening temperature of 226 ° C. Compressive strength after calcination at, kgf / cm. 120 200 200 at 1500 ° С, kgf / cm - 60 120 120 The degree of erosion by the cast iron after firing at 1500 s, mg / cm. min 1.7 1.4 1.3 Oxidability after calcination with, mg / cm min4.9 4.3 4.3

invention 1. Padded refractory mass including coke, refractory clay, coal tar pitch and graphite-containing material, characterized by

thirty

thirty

By the fact that, in order to increase strength, erosion resistance and reduce oxidation, it contains as a graphite-containing material waste electrode graphitization for 5-10 minutes before the final mass is obtained. The table presents the properties of the proposed and known compositions. As can be seen from the table, the masses, which contain the waste of graphitization of electrode production, have higher values of strength and erosion resistance to the action of liquid iron and lower oxidability than the known mass, which includes crystalline graphite. Replacing the pitch with the softening temperature ISS-ISO C with a pitch with a softening temperature of 22b ° C provides an increase in the strength of erosion resistance and a decrease in the oxidability of the ramming refractory mass. 30 45 55 20 20 20 20 20 20 20 202 204 190 125 120 110 1.0 0.9 0.8 0.9 3.9 3.8 3.6 3.8 5814 production in the following ratio of components, weight. Coke 5-55 Clay refractory 15-30 Peck coal 10-25 Waste graphitization of electrode production 5-55 984. 6 2. Mass of pop.1, which is different from the fact that it contains coal tar pitch with a softening temperature of 200-300 C. Sources of information, 5 taken into account during the examination 1. Krasavtsev N.I. and others. Mechanization of work in blast furnaces, 1968. 2. USSR author's certificate number 442212, cl. From 21 to 7/12, 1973.

Claims (2)

Claim 1. Stuffed refractory mass including coke, clay refractory, tar coal and graphite-containing material, characterized in that, in order to increase strength, erosion resistance and reduce oxidizability, it contains graphite-containing material 65 as graphite-containing waste from electrode production when components are used, Coke Refractory clay Pitch coal Waste graphitization elektricheskogo the following ratio wt.%: 5-55 15-30 10-25 trodnogo production 5-55 2. ’’ A mass according to claim 1, characterized in that it contains coal tar pitch ^ with a softening temperature of 200-300 C.